changed default sorting of samples (#19335)

bin/configs/csharp-generichost-net4.7-allOf.yaml

@@ -11,3 +11,5 @@ additionalProperties:
   nullableReferenceTypes: false
   equatable: true
   targetFramework: net47
+  modelPropertySorting: alphabetical
+  operationParameterSorting: alphabetical

bin/configs/csharp-generichost-net4.7-anyOf.yaml

@@ -11,3 +11,5 @@ additionalProperties:
   nullableReferenceTypes: false
   equatable: true
   targetFramework: net47
+  modelPropertySorting: alphabetical
+  operationParameterSorting: alphabetical

bin/configs/csharp-generichost-net4.7-anyOfNoCompare.yaml

@@ -11,3 +11,5 @@ additionalProperties:
   nullableReferenceTypes: false
   equatable: true
   targetFramework: net47
+  modelPropertySorting: alphabetical
+  operationParameterSorting: alphabetical

bin/configs/csharp-generichost-net4.7-formModels.yaml

@@ -13,5 +13,6 @@ additionalProperties:
   targetFramework: net47
   skipFormModel: false
   modelPropertySorting: alphabetical
+  operationParameterSorting: alphabetical
 inlineSchemaOptions:
   RESOLVE_INLINE_ENUMS: true

bin/configs/csharp-generichost-net4.7-oneOf.yaml

@@ -11,3 +11,5 @@ additionalProperties:
   nullableReferenceTypes: false
   equatable: true
   targetFramework: net47
+  modelPropertySorting: alphabetical
+  operationParameterSorting: alphabetical

bin/configs/csharp-generichost-net4.7-useDateTimeForDate.yaml

@@ -9,3 +9,4 @@ additionalProperties:
   useDateTimeForDate: true
   targetFramework: net47
   modelPropertySorting: alphabetical
+  operationParameterSorting: alphabetical

bin/configs/csharp-generichost-net4.7.yaml

@@ -12,3 +12,4 @@ additionalProperties:
   equatable: true
   targetFramework: net47
   modelPropertySorting: alphabetical
+  operationParameterSorting: alphabetical

bin/configs/csharp-generichost-net4.8-allOf.yaml

@@ -11,3 +11,5 @@ additionalProperties:
   nullableReferenceTypes: false
   equatable: true
   targetFramework: net48
+  modelPropertySorting: alphabetical
+  operationParameterSorting: alphabetical

bin/configs/csharp-generichost-net4.8-anyOf.yaml

@@ -11,3 +11,5 @@ additionalProperties:
   nullableReferenceTypes: false
   equatable: true
   targetFramework: net48
+  modelPropertySorting: alphabetical
+  operationParameterSorting: alphabetical

bin/configs/csharp-generichost-net4.8-anyOfNoCompare.yaml

@@ -11,3 +11,5 @@ additionalProperties:
   nullableReferenceTypes: false
   equatable: true
   targetFramework: net48
+  modelPropertySorting: alphabetical
+  operationParameterSorting: alphabetical

bin/configs/csharp-generichost-net4.8-formModels.yaml

@@ -13,5 +13,6 @@ additionalProperties:
   targetFramework: net48
   skipFormModel: false
   modelPropertySorting: alphabetical
+  operationParameterSorting: alphabetical
 inlineSchemaOptions:
   RESOLVE_INLINE_ENUMS: true

bin/configs/csharp-generichost-net4.8-oneOf.yaml

@@ -11,3 +11,5 @@ additionalProperties:
   nullableReferenceTypes: false
   equatable: true
   targetFramework: net48
+  modelPropertySorting: alphabetical
+  operationParameterSorting: alphabetical

bin/configs/csharp-generichost-net4.8-useDateTimeForDate.yaml

@@ -9,3 +9,4 @@ additionalProperties:
   useDateTimeForDate: true
   targetFramework: net48
   modelPropertySorting: alphabetical
+  operationParameterSorting: alphabetical

bin/configs/csharp-generichost-net4.8.yaml

@@ -12,3 +12,4 @@ additionalProperties:
   equatable: true
   targetFramework: net48
   modelPropertySorting: alphabetical
+  operationParameterSorting: alphabetical

bin/configs/csharp-generichost-net8-allOf.yaml

@@ -11,3 +11,5 @@ additionalProperties:
   nullableReferenceTypes: true
   equatable: true
   targetFramework: net8.0
+  modelPropertySorting: alphabetical
+  operationParameterSorting: alphabetical

bin/configs/csharp-generichost-net8-anyOf.yaml

@@ -11,3 +11,5 @@ additionalProperties:
   nullableReferenceTypes: true
   equatable: true
   targetFramework: net8.0
+  modelPropertySorting: alphabetical
+  operationParameterSorting: alphabetical

bin/configs/csharp-generichost-net8-anyOfNoCompare.yaml

@@ -11,3 +11,5 @@ additionalProperties:
   nullableReferenceTypes: true
   equatable: true
   targetFramework: net8.0
+  modelPropertySorting: alphabetical
+  operationParameterSorting: alphabetical

bin/configs/csharp-generichost-net8-formModels.yaml

@@ -13,5 +13,6 @@ additionalProperties:
   targetFramework: net8.0
   skipFormModel: false
   modelPropertySorting: alphabetical
+  operationParameterSorting: alphabetical
 inlineSchemaOptions:
   RESOLVE_INLINE_ENUMS: true

bin/configs/csharp-generichost-net8-nrt-useSourceGeneration.yaml

@@ -12,3 +12,4 @@ additionalProperties:
   equatable: true
   targetFramework: net8.0
   modelPropertySorting: alphabetical
+  operationParameterSorting: alphabetical

bin/configs/csharp-generichost-net8-nrt.yaml

@@ -12,3 +12,4 @@ additionalProperties:
   equatable: true
   targetFramework: net8.0
   modelPropertySorting: alphabetical
+  operationParameterSorting: alphabetical

bin/configs/csharp-generichost-net8-oneOf.yaml

@@ -11,3 +11,5 @@ additionalProperties:
   nullableReferenceTypes: true
   equatable: true
   targetFramework: net8.0
+  modelPropertySorting: alphabetical
+  operationParameterSorting: alphabetical

bin/configs/csharp-generichost-net8-useDateTimeForDate.yaml

@@ -9,3 +9,4 @@ additionalProperties:
   useDateTimeForDate: true
   targetFramework: net8.0
   modelPropertySorting: alphabetical
+  operationParameterSorting: alphabetical

bin/configs/csharp-generichost-net8.yaml

@@ -12,3 +12,4 @@ additionalProperties:
   equatable: true
   targetFramework: net8.0
   modelPropertySorting: alphabetical
+  operationParameterSorting: alphabetical

bin/configs/csharp-generichost-netstandard2.0.yaml

@@ -11,3 +11,4 @@ additionalProperties:
   targetFramework: netstandard2.0
   equatable: true
   modelPropertySorting: alphabetical
+  operationParameterSorting: alphabetical

samples/client/petstore/csharp/generichost/net4.7/AllOf/docs/models/Adult.md

@@ -5,9 +5,9 @@ A representation of an adult
 
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
-**Type** | **string** |  | [optional] 
-**LastName** | **string** |  | [optional] 
 **FirstName** | **string** |  | [optional] 
+**LastName** | **string** |  | [optional] 
+**Type** | **string** |  | [optional] 
 **Children** | [**List<Child>**](Child.md) |  | [optional] 
 
 [[Back to Model list]](../../README.md#documentation-for-models) [[Back to API list]](../../README.md#documentation-for-api-endpoints) [[Back to README]](../../README.md)

samples/client/petstore/csharp/generichost/net4.7/AllOf/docs/models/Child.md

@@ -5,11 +5,11 @@ A representation of a child
 
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
-**Type** | **string** |  | [optional] 
-**LastName** | **string** |  | [optional] 
 **FirstName** | **string** |  | [optional] 
-**BoosterSeat** | **bool** |  | [optional] 
+**LastName** | **string** |  | [optional] 
+**Type** | **string** |  | [optional] 
 **Age** | **int** |  | [optional] 
+**BoosterSeat** | **bool** |  | [optional] 
 
 [[Back to Model list]](../../README.md#documentation-for-models) [[Back to API list]](../../README.md#documentation-for-api-endpoints) [[Back to README]](../../README.md)
 

samples/client/petstore/csharp/generichost/net4.7/AllOf/docs/models/Person.md

@@ -4,9 +4,9 @@
 
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
-**Type** | **string** |  | [optional] 
-**LastName** | **string** |  | [optional] 
 **FirstName** | **string** |  | [optional] 
+**LastName** | **string** |  | [optional] 
+**Type** | **string** |  | [optional] 
 
 [[Back to Model list]](../../README.md#documentation-for-models) [[Back to API list]](../../README.md#documentation-for-api-endpoints) [[Back to README]](../../README.md)
 

samples/client/petstore/csharp/generichost/net4.7/AllOf/src/Org.OpenAPITools.Test/Model/ChildTests.cs

@@ -53,15 +53,6 @@ namespace Org.OpenAPITools.Test.Model
             //Assert.IsType<Child>(instance);
         }
 
-        /// <summary>
-        /// Test the property 'BoosterSeat'
-        /// </summary>
-        [Fact]
-        public void BoosterSeatTest()
-        {
-            // TODO unit test for the property 'BoosterSeat'
-        }
-
         /// <summary>
         /// Test the property 'Age'
         /// </summary>
@@ -70,5 +61,14 @@ namespace Org.OpenAPITools.Test.Model
         {
             // TODO unit test for the property 'Age'
         }
+
+        /// <summary>
+        /// Test the property 'BoosterSeat'
+        /// </summary>
+        [Fact]
+        public void BoosterSeatTest()
+        {
+            // TODO unit test for the property 'BoosterSeat'
+        }
     }
 }

samples/client/petstore/csharp/generichost/net4.7/AllOf/src/Org.OpenAPITools.Test/Model/PersonTests.cs

@@ -74,12 +74,12 @@ namespace Org.OpenAPITools.Test.Model
         }
 
         /// <summary>
-        /// Test the property 'Type'
+        /// Test the property 'FirstName'
         /// </summary>
         [Fact]
-        public void TypeTest()
+        public void FirstNameTest()
         {
-            // TODO unit test for the property 'Type'
+            // TODO unit test for the property 'FirstName'
         }
 
         /// <summary>
@@ -92,12 +92,12 @@ namespace Org.OpenAPITools.Test.Model
         }
 
         /// <summary>
-        /// Test the property 'FirstName'
+        /// Test the property 'Type'
         /// </summary>
         [Fact]
-        public void FirstNameTest()
+        public void TypeTest()
         {
-            // TODO unit test for the property 'FirstName'
+            // TODO unit test for the property 'Type'
         }
     }
 }

samples/client/petstore/csharp/generichost/net4.7/AllOf/src/Org.OpenAPITools/Model/Adult.cs

@@ -32,11 +32,11 @@ namespace Org.OpenAPITools.Model
         /// <summary>
         /// Initializes a new instance of the <see cref="Adult" /> class.
         /// </summary>
-        /// <param name="lastName">lastName</param>
-        /// <param name="firstName">firstName</param>
         /// <param name="children">children</param>
+        /// <param name="firstName">firstName</param>
+        /// <param name="lastName">lastName</param>
         [JsonConstructor]
-        public Adult(Option<string> lastName = default, Option<string> firstName = default, Option<List<Child>> children = default) : base(lastName, firstName)
+        public Adult(Option<List<Child>> children = default, Option<string> firstName = default, Option<string> lastName = default) : base(firstName, lastName)
         {
             ChildrenOption = children;
             OnCreated();
@@ -44,13 +44,6 @@ namespace Org.OpenAPITools.Model
 
         partial void OnCreated();
 
-        /// <summary>
-        /// The discriminator
-        /// </summary>
-        [JsonIgnore]
-        [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
-        public new string Type { get; } = "Adult";
-
         /// <summary>
         /// Used to track the state of Children
         /// </summary>
@@ -64,6 +57,13 @@ namespace Org.OpenAPITools.Model
         [JsonPropertyName("children")]
         public List<Child> Children { get { return this.ChildrenOption; } set { this.ChildrenOption = new Option<List<Child>>(value); } }
 
+        /// <summary>
+        /// The discriminator
+        /// </summary>
+        [JsonIgnore]
+        [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
+        public new string Type { get; } = "Adult";
+
         /// <summary>
         /// Returns the string presentation of the object
         /// </summary>
@@ -101,10 +101,10 @@ namespace Org.OpenAPITools.Model
 
             JsonTokenType startingTokenType = utf8JsonReader.TokenType;
 
-            Option<string> type = default;
-            Option<string> lastName = default;
-            Option<string> firstName = default;
             Option<List<Child>> children = default;
+            Option<string> firstName = default;
+            Option<string> lastName = default;
+            Option<string> type = default;
 
             while (utf8JsonReader.Read())
             {
@@ -121,18 +121,18 @@ namespace Org.OpenAPITools.Model
 
                     switch (localVarJsonPropertyName)
                     {
-                        case "$_type":
-                            type = new Option<string>(utf8JsonReader.GetString());
-                            break;
-                        case "lastName":
-                            lastName = new Option<string>(utf8JsonReader.GetString());
+                        case "children":
+                            if (utf8JsonReader.TokenType != JsonTokenType.Null)
+                                children = new Option<List<Child>>(JsonSerializer.Deserialize<List<Child>>(ref utf8JsonReader, jsonSerializerOptions));
                             break;
                         case "firstName":
                             firstName = new Option<string>(utf8JsonReader.GetString());
                             break;
-                        case "children":
-                            if (utf8JsonReader.TokenType != JsonTokenType.Null)
-                                children = new Option<List<Child>>(JsonSerializer.Deserialize<List<Child>>(ref utf8JsonReader, jsonSerializerOptions));
+                        case "lastName":
+                            lastName = new Option<string>(utf8JsonReader.GetString());
+                            break;
+                        case "$_type":
+                            type = new Option<string>(utf8JsonReader.GetString());
                             break;
                         default:
                             break;
@@ -140,19 +140,19 @@ namespace Org.OpenAPITools.Model
                 }
             }
 
-            if (type.IsSet && type.Value == null)
-                throw new ArgumentNullException(nameof(type), "Property is not nullable for class Adult.");
-
-            if (lastName.IsSet && lastName.Value == null)
-                throw new ArgumentNullException(nameof(lastName), "Property is not nullable for class Adult.");
+            if (children.IsSet && children.Value == null)
+                throw new ArgumentNullException(nameof(children), "Property is not nullable for class Adult.");
 
             if (firstName.IsSet && firstName.Value == null)
                 throw new ArgumentNullException(nameof(firstName), "Property is not nullable for class Adult.");
 
-            if (children.IsSet && children.Value == null)
-                throw new ArgumentNullException(nameof(children), "Property is not nullable for class Adult.");
+            if (lastName.IsSet && lastName.Value == null)
+                throw new ArgumentNullException(nameof(lastName), "Property is not nullable for class Adult.");
 
-            return new Adult(lastName, firstName, children);
+            if (type.IsSet && type.Value == null)
+                throw new ArgumentNullException(nameof(type), "Property is not nullable for class Adult.");
+
+            return new Adult(children, firstName, lastName);
         }
 
         /// <summary>
@@ -179,28 +179,27 @@ namespace Org.OpenAPITools.Model
         /// <exception cref="NotImplementedException"></exception>
         public void WriteProperties(Utf8JsonWriter writer, Adult adult, JsonSerializerOptions jsonSerializerOptions)
         {
-            if (adult.LastNameOption.IsSet && adult.LastName == null)
-                throw new ArgumentNullException(nameof(adult.LastName), "Property is required for class Adult.");
+            if (adult.ChildrenOption.IsSet && adult.Children == null)
+                throw new ArgumentNullException(nameof(adult.Children), "Property is required for class Adult.");
 
             if (adult.FirstNameOption.IsSet && adult.FirstName == null)
                 throw new ArgumentNullException(nameof(adult.FirstName), "Property is required for class Adult.");
 
-            if (adult.ChildrenOption.IsSet && adult.Children == null)
-                throw new ArgumentNullException(nameof(adult.Children), "Property is required for class Adult.");
-
-            writer.WriteString("$_type", adult.Type);
-
-            if (adult.LastNameOption.IsSet)
-                writer.WriteString("lastName", adult.LastName);
-
-            if (adult.FirstNameOption.IsSet)
-                writer.WriteString("firstName", adult.FirstName);
+            if (adult.LastNameOption.IsSet && adult.LastName == null)
+                throw new ArgumentNullException(nameof(adult.LastName), "Property is required for class Adult.");
 
             if (adult.ChildrenOption.IsSet)
             {
                 writer.WritePropertyName("children");
                 JsonSerializer.Serialize(writer, adult.Children, jsonSerializerOptions);
             }
+            if (adult.FirstNameOption.IsSet)
+                writer.WriteString("firstName", adult.FirstName);
+
+            if (adult.LastNameOption.IsSet)
+                writer.WriteString("lastName", adult.LastName);
+
+            writer.WriteString("$_type", adult.Type);
         }
     }
 }

samples/client/petstore/csharp/generichost/net4.7/AllOf/src/Org.OpenAPITools/Model/Child.cs

@@ -32,12 +32,12 @@ namespace Org.OpenAPITools.Model
         /// <summary>
         /// Initializes a new instance of the <see cref="Child" /> class.
         /// </summary>
-        /// <param name="lastName">lastName</param>
-        /// <param name="firstName">firstName</param>
         /// <param name="age">age</param>
+        /// <param name="firstName">firstName</param>
+        /// <param name="lastName">lastName</param>
         /// <param name="boosterSeat">boosterSeat</param>
         [JsonConstructor]
-        public Child(Option<string> lastName = default, Option<string> firstName = default, Option<int?> age = default, Option<bool?> boosterSeat = default) : base(lastName, firstName)
+        public Child(Option<int?> age = default, Option<string> firstName = default, Option<string> lastName = default, Option<bool?> boosterSeat = default) : base(firstName, lastName)
         {
             AgeOption = age;
             BoosterSeatOption = boosterSeat;
@@ -46,13 +46,6 @@ namespace Org.OpenAPITools.Model
 
         partial void OnCreated();
 
-        /// <summary>
-        /// The discriminator
-        /// </summary>
-        [JsonIgnore]
-        [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
-        public new string Type { get; } = "Child";
-
         /// <summary>
         /// Used to track the state of Age
         /// </summary>
@@ -66,6 +59,13 @@ namespace Org.OpenAPITools.Model
         [JsonPropertyName("age")]
         public int? Age { get { return this.AgeOption; } set { this.AgeOption = new Option<int?>(value); } }
 
+        /// <summary>
+        /// The discriminator
+        /// </summary>
+        [JsonIgnore]
+        [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
+        public new string Type { get; } = "Child";
+
         /// <summary>
         /// Used to track the state of BoosterSeat
         /// </summary>
@@ -88,8 +88,8 @@ namespace Org.OpenAPITools.Model
             StringBuilder sb = new StringBuilder();
             sb.Append("class Child {\n");
             sb.Append("  ").Append(base.ToString()?.Replace("\n", "\n  ")).Append("\n");
-            sb.Append("  BoosterSeat: ").Append(BoosterSeat).Append("\n");
             sb.Append("  Age: ").Append(Age).Append("\n");
+            sb.Append("  BoosterSeat: ").Append(BoosterSeat).Append("\n");
             sb.Append("}\n");
             return sb.ToString();
         }
@@ -117,10 +117,10 @@ namespace Org.OpenAPITools.Model
 
             JsonTokenType startingTokenType = utf8JsonReader.TokenType;
 
-            Option<string> type = default;
-            Option<string> lastName = default;
-            Option<string> firstName = default;
             Option<int?> age = default;
+            Option<string> firstName = default;
+            Option<string> lastName = default;
+            Option<string> type = default;
             Option<bool?> boosterSeat = default;
 
             while (utf8JsonReader.Read())
@@ -138,18 +138,18 @@ namespace Org.OpenAPITools.Model
 
                     switch (localVarJsonPropertyName)
                     {
-                        case "$_type":
-                            type = new Option<string>(utf8JsonReader.GetString());
-                            break;
-                        case "lastName":
-                            lastName = new Option<string>(utf8JsonReader.GetString());
+                        case "age":
+                            if (utf8JsonReader.TokenType != JsonTokenType.Null)
+                                age = new Option<int?>(utf8JsonReader.GetInt32());
                             break;
                         case "firstName":
                             firstName = new Option<string>(utf8JsonReader.GetString());
                             break;
-                        case "age":
-                            if (utf8JsonReader.TokenType != JsonTokenType.Null)
-                                age = new Option<int?>(utf8JsonReader.GetInt32());
+                        case "lastName":
+                            lastName = new Option<string>(utf8JsonReader.GetString());
+                            break;
+                        case "$_type":
+                            type = new Option<string>(utf8JsonReader.GetString());
                             break;
                         case "boosterSeat":
                             if (utf8JsonReader.TokenType != JsonTokenType.Null)
@@ -161,22 +161,22 @@ namespace Org.OpenAPITools.Model
                 }
             }
 
-            if (type.IsSet && type.Value == null)
-                throw new ArgumentNullException(nameof(type), "Property is not nullable for class Child.");
-
-            if (lastName.IsSet && lastName.Value == null)
-                throw new ArgumentNullException(nameof(lastName), "Property is not nullable for class Child.");
+            if (age.IsSet && age.Value == null)
+                throw new ArgumentNullException(nameof(age), "Property is not nullable for class Child.");
 
             if (firstName.IsSet && firstName.Value == null)
                 throw new ArgumentNullException(nameof(firstName), "Property is not nullable for class Child.");
 
-            if (age.IsSet && age.Value == null)
-                throw new ArgumentNullException(nameof(age), "Property is not nullable for class Child.");
+            if (lastName.IsSet && lastName.Value == null)
+                throw new ArgumentNullException(nameof(lastName), "Property is not nullable for class Child.");
+
+            if (type.IsSet && type.Value == null)
+                throw new ArgumentNullException(nameof(type), "Property is not nullable for class Child.");
 
             if (boosterSeat.IsSet && boosterSeat.Value == null)
                 throw new ArgumentNullException(nameof(boosterSeat), "Property is not nullable for class Child.");
 
-            return new Child(lastName, firstName, age, boosterSeat);
+            return new Child(age, firstName, lastName, boosterSeat);
         }
 
         /// <summary>
@@ -203,22 +203,22 @@ namespace Org.OpenAPITools.Model
         /// <exception cref="NotImplementedException"></exception>
         public void WriteProperties(Utf8JsonWriter writer, Child child, JsonSerializerOptions jsonSerializerOptions)
         {
-            if (child.LastNameOption.IsSet && child.LastName == null)
-                throw new ArgumentNullException(nameof(child.LastName), "Property is required for class Child.");
-
             if (child.FirstNameOption.IsSet && child.FirstName == null)
                 throw new ArgumentNullException(nameof(child.FirstName), "Property is required for class Child.");
 
-            writer.WriteString("$_type", child.Type);
+            if (child.LastNameOption.IsSet && child.LastName == null)
+                throw new ArgumentNullException(nameof(child.LastName), "Property is required for class Child.");
 
-            if (child.LastNameOption.IsSet)
-                writer.WriteString("lastName", child.LastName);
+            if (child.AgeOption.IsSet)
+                writer.WriteNumber("age", child.AgeOption.Value.Value);
 
             if (child.FirstNameOption.IsSet)
                 writer.WriteString("firstName", child.FirstName);
 
-            if (child.AgeOption.IsSet)
-                writer.WriteNumber("age", child.AgeOption.Value.Value);
+            if (child.LastNameOption.IsSet)
+                writer.WriteString("lastName", child.LastName);
+
+            writer.WriteString("$_type", child.Type);
 
             if (child.BoosterSeatOption.IsSet)
                 writer.WriteBoolean("boosterSeat", child.BoosterSeatOption.Value.Value);

samples/client/petstore/csharp/generichost/net4.7/AllOf/src/Org.OpenAPITools/Model/Person.cs

@@ -32,38 +32,18 @@ namespace Org.OpenAPITools.Model
         /// <summary>
         /// Initializes a new instance of the <see cref="Person" /> class.
         /// </summary>
-        /// <param name="lastName">lastName</param>
         /// <param name="firstName">firstName</param>
+        /// <param name="lastName">lastName</param>
         [JsonConstructor]
-        public Person(Option<string> lastName = default, Option<string> firstName = default)
+        public Person(Option<string> firstName = default, Option<string> lastName = default)
         {
-            LastNameOption = lastName;
             FirstNameOption = firstName;
+            LastNameOption = lastName;
             OnCreated();
         }
 
         partial void OnCreated();
 
-        /// <summary>
-        /// The discriminator
-        /// </summary>
-        [JsonIgnore]
-        [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
-        public string Type { get; } = "Person";
-
-        /// <summary>
-        /// Used to track the state of LastName
-        /// </summary>
-        [JsonIgnore]
-        [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
-        public Option<string> LastNameOption { get; private set; }
-
-        /// <summary>
-        /// Gets or Sets LastName
-        /// </summary>
-        [JsonPropertyName("lastName")]
-        public string LastName { get { return this.LastNameOption; } set { this.LastNameOption = new Option<string>(value); } }
-
         /// <summary>
         /// Used to track the state of FirstName
         /// </summary>
@@ -77,6 +57,26 @@ namespace Org.OpenAPITools.Model
         [JsonPropertyName("firstName")]
         public string FirstName { get { return this.FirstNameOption; } set { this.FirstNameOption = new Option<string>(value); } }
 
+        /// <summary>
+        /// Used to track the state of LastName
+        /// </summary>
+        [JsonIgnore]
+        [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
+        public Option<string> LastNameOption { get; private set; }
+
+        /// <summary>
+        /// Gets or Sets LastName
+        /// </summary>
+        [JsonPropertyName("lastName")]
+        public string LastName { get { return this.LastNameOption; } set { this.LastNameOption = new Option<string>(value); } }
+
+        /// <summary>
+        /// The discriminator
+        /// </summary>
+        [JsonIgnore]
+        [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
+        public string Type { get; } = "Person";
+
         /// <summary>
         /// Gets or Sets additional properties
         /// </summary>
@@ -91,8 +91,8 @@ namespace Org.OpenAPITools.Model
         {
             StringBuilder sb = new StringBuilder();
             sb.Append("class Person {\n");
-            sb.Append("  LastName: ").Append(LastName).Append("\n");
             sb.Append("  FirstName: ").Append(FirstName).Append("\n");
+            sb.Append("  LastName: ").Append(LastName).Append("\n");
             sb.Append("  AdditionalProperties: ").Append(AdditionalProperties).Append("\n");
             sb.Append("}\n");
             return sb.ToString();
@@ -141,9 +141,9 @@ namespace Org.OpenAPITools.Model
 
             JsonTokenType startingTokenType = utf8JsonReader.TokenType;
 
-            Option<string> type = default;
-            Option<string> lastName = default;
             Option<string> firstName = default;
+            Option<string> lastName = default;
+            Option<string> type = default;
 
             string discriminator = ClientUtils.GetDiscriminator(utf8JsonReader, "$_type");
 
@@ -168,14 +168,14 @@ namespace Org.OpenAPITools.Model
 
                     switch (localVarJsonPropertyName)
                     {
-                        case "$_type":
-                            type = new Option<string>(utf8JsonReader.GetString());
+                        case "firstName":
+                            firstName = new Option<string>(utf8JsonReader.GetString());
                             break;
                         case "lastName":
                             lastName = new Option<string>(utf8JsonReader.GetString());
                             break;
-                        case "firstName":
-                            firstName = new Option<string>(utf8JsonReader.GetString());
+                        case "$_type":
+                            type = new Option<string>(utf8JsonReader.GetString());
                             break;
                         default:
                             break;
@@ -183,16 +183,16 @@ namespace Org.OpenAPITools.Model
                 }
             }
 
-            if (type.IsSet && type.Value == null)
-                throw new ArgumentNullException(nameof(type), "Property is not nullable for class Person.");
+            if (firstName.IsSet && firstName.Value == null)
+                throw new ArgumentNullException(nameof(firstName), "Property is not nullable for class Person.");
 
             if (lastName.IsSet && lastName.Value == null)
                 throw new ArgumentNullException(nameof(lastName), "Property is not nullable for class Person.");
 
-            if (firstName.IsSet && firstName.Value == null)
-                throw new ArgumentNullException(nameof(firstName), "Property is not nullable for class Person.");
+            if (type.IsSet && type.Value == null)
+                throw new ArgumentNullException(nameof(type), "Property is not nullable for class Person.");
 
-            return new Person(lastName, firstName);
+            return new Person(firstName, lastName);
         }
 
         /// <summary>
@@ -229,19 +229,19 @@ namespace Org.OpenAPITools.Model
         /// <exception cref="NotImplementedException"></exception>
         public void WriteProperties(Utf8JsonWriter writer, Person person, JsonSerializerOptions jsonSerializerOptions)
         {
-            if (person.LastNameOption.IsSet && person.LastName == null)
-                throw new ArgumentNullException(nameof(person.LastName), "Property is required for class Person.");
-
             if (person.FirstNameOption.IsSet && person.FirstName == null)
                 throw new ArgumentNullException(nameof(person.FirstName), "Property is required for class Person.");
 
-            writer.WriteString("$_type", person.Type);
+            if (person.LastNameOption.IsSet && person.LastName == null)
+                throw new ArgumentNullException(nameof(person.LastName), "Property is required for class Person.");
+
+            if (person.FirstNameOption.IsSet)
+                writer.WriteString("firstName", person.FirstName);
 
             if (person.LastNameOption.IsSet)
                 writer.WriteString("lastName", person.LastName);
 
-            if (person.FirstNameOption.IsSet)
-                writer.WriteString("firstName", person.FirstName);
+            writer.WriteString("$_type", person.Type);
         }
     }
 }

samples/client/petstore/csharp/generichost/net4.7/FormModels/docs/apis/FakeApi.md

@@ -1067,7 +1067,7 @@ No authorization required
 
 <a id="testendpointparameters"></a>
 # **TestEndpointParameters**
-> void TestEndpointParameters (decimal number, double varDouble, string patternWithoutDelimiter, byte[] varByte, int integer = null, int int32 = null, long int64 = null, float varFloat = null, string varString = null, System.IO.Stream binary = null, DateTime date = null, DateTime dateTime = null, string password = null, string callback = null)
+> void TestEndpointParameters (decimal number, string patternWithoutDelimiter, byte[] varByte, double varDouble, System.IO.Stream binary = null, string callback = null, DateTime date = null, DateTime dateTime = null, int int32 = null, long int64 = null, int integer = null, string password = null, float varFloat = null, string varString = null)
 
 Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
 
@@ -1095,24 +1095,24 @@ namespace Example
 
             var apiInstance = new FakeApi(config);
             var number = 8.14D;  // decimal | None
-            var varDouble = 1.2D;  // double | None
             var patternWithoutDelimiter = "patternWithoutDelimiter_example";  // string | None
             var varByte = System.Text.Encoding.ASCII.GetBytes("BYTE_ARRAY_DATA_HERE");  // byte[] | None
-            var integer = 56;  // int | None (optional) 
-            var int32 = 56;  // int | None (optional) 
-            var int64 = 789L;  // long | None (optional) 
-            var varFloat = 3.4F;  // float | None (optional) 
-            var varString = "varString_example";  // string | None (optional) 
+            var varDouble = 1.2D;  // double | None
             var binary = new System.IO.MemoryStream(System.IO.File.ReadAllBytes("/path/to/file.txt"));  // System.IO.Stream | None (optional) 
+            var callback = "callback_example";  // string | None (optional) 
             var date = DateTime.Parse("2013-10-20");  // DateTime | None (optional) 
             var dateTime = DateTime.Parse(""2010-02-01T10:20:10.111110+01:00"");  // DateTime | None (optional)  (default to "2010-02-01T10:20:10.111110+01:00")
+            var int32 = 56;  // int | None (optional) 
+            var int64 = 789L;  // long | None (optional) 
+            var integer = 56;  // int | None (optional) 
             var password = "password_example";  // string | None (optional) 
-            var callback = "callback_example";  // string | None (optional) 
+            var varFloat = 3.4F;  // float | None (optional) 
+            var varString = "varString_example";  // string | None (optional) 
 
             try
             {
                 // Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
-                apiInstance.TestEndpointParameters(number, varDouble, patternWithoutDelimiter, varByte, integer, int32, int64, varFloat, varString, binary, date, dateTime, password, callback);
+                apiInstance.TestEndpointParameters(number, patternWithoutDelimiter, varByte, varDouble, binary, callback, date, dateTime, int32, int64, integer, password, varFloat, varString);
             }
             catch (ApiException  e)
             {
@@ -1132,7 +1132,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
-    apiInstance.TestEndpointParametersWithHttpInfo(number, varDouble, patternWithoutDelimiter, varByte, integer, int32, int64, varFloat, varString, binary, date, dateTime, password, callback);
+    apiInstance.TestEndpointParametersWithHttpInfo(number, patternWithoutDelimiter, varByte, varDouble, binary, callback, date, dateTime, int32, int64, integer, password, varFloat, varString);
 }
 catch (ApiException e)
 {
@@ -1147,19 +1147,19 @@ catch (ApiException e)
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
 | **number** | **decimal** | None |  |
-| **varDouble** | **double** | None |  |
 | **patternWithoutDelimiter** | **string** | None |  |
 | **varByte** | **byte[]** | None |  |
-| **integer** | **int** | None | [optional]  |
-| **int32** | **int** | None | [optional]  |
-| **int64** | **long** | None | [optional]  |
-| **varFloat** | **float** | None | [optional]  |
-| **varString** | **string** | None | [optional]  |
+| **varDouble** | **double** | None |  |
 | **binary** | **System.IO.Stream****System.IO.Stream** | None | [optional]  |
+| **callback** | **string** | None | [optional]  |
 | **date** | **DateTime** | None | [optional]  |
 | **dateTime** | **DateTime** | None | [optional] [default to &quot;2010-02-01T10:20:10.111110+01:00&quot;] |
+| **int32** | **int** | None | [optional]  |
+| **int64** | **long** | None | [optional]  |
+| **integer** | **int** | None | [optional]  |
 | **password** | **string** | None | [optional]  |
-| **callback** | **string** | None | [optional]  |
+| **varFloat** | **float** | None | [optional]  |
+| **varString** | **string** | None | [optional]  |
 
 ### Return type
 
@@ -1185,7 +1185,7 @@ void (empty response body)
 
 <a id="testenumparameters"></a>
 # **TestEnumParameters**
-> void TestEnumParameters (List<TestEnumParametersRequestEnumFormStringArrayInner> enumHeaderStringArray = null, TestEnumParametersEnumHeaderStringParameter enumHeaderString = null, List<TestEnumParametersRequestEnumFormStringArrayInner> enumQueryStringArray = null, TestEnumParametersEnumHeaderStringParameter enumQueryString = null, TestEnumParametersEnumQueryIntegerParameter enumQueryInteger = null, TestEnumParametersEnumQueryDoubleParameter enumQueryDouble = null, List<TestEnumParametersRequestEnumFormStringArrayInner> enumFormStringArray = null, TestEnumParametersRequestEnumFormString enumFormString = null)
+> void TestEnumParameters (TestEnumParametersRequestEnumFormString enumFormString = null, List<TestEnumParametersRequestEnumFormStringArrayInner> enumFormStringArray = null, TestEnumParametersEnumHeaderStringParameter enumHeaderString = null, List<TestEnumParametersRequestEnumFormStringArrayInner> enumHeaderStringArray = null, TestEnumParametersEnumQueryDoubleParameter enumQueryDouble = null, TestEnumParametersEnumQueryIntegerParameter enumQueryInteger = null, TestEnumParametersEnumHeaderStringParameter enumQueryString = null, List<TestEnumParametersRequestEnumFormStringArrayInner> enumQueryStringArray = null)
 
 To test enum parameters
 
@@ -1208,19 +1208,19 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new FakeApi(config);
-            var enumHeaderStringArray = new List<TestEnumParametersRequestEnumFormStringArrayInner>(); // List<TestEnumParametersRequestEnumFormStringArrayInner> | Header parameter enum test (string array) (optional) 
-            var enumHeaderString = (TestEnumParametersEnumHeaderStringParameter) "_abc";  // TestEnumParametersEnumHeaderStringParameter | Header parameter enum test (string) (optional) 
-            var enumQueryStringArray = new List<TestEnumParametersRequestEnumFormStringArrayInner>(); // List<TestEnumParametersRequestEnumFormStringArrayInner> | Query parameter enum test (string array) (optional) 
-            var enumQueryString = (TestEnumParametersEnumHeaderStringParameter) "_abc";  // TestEnumParametersEnumHeaderStringParameter | Query parameter enum test (string) (optional) 
-            var enumQueryInteger = (TestEnumParametersEnumQueryIntegerParameter) "1";  // TestEnumParametersEnumQueryIntegerParameter | Query parameter enum test (double) (optional) 
-            var enumQueryDouble = (TestEnumParametersEnumQueryDoubleParameter) "1.1";  // TestEnumParametersEnumQueryDoubleParameter | Query parameter enum test (double) (optional) 
-            var enumFormStringArray = new List<TestEnumParametersRequestEnumFormStringArrayInner>(); // List<TestEnumParametersRequestEnumFormStringArrayInner> | Form parameter enum test (string array) (optional) 
             var enumFormString = (TestEnumParametersRequestEnumFormString) "_abc";  // TestEnumParametersRequestEnumFormString |  (optional) 
+            var enumFormStringArray = new List<TestEnumParametersRequestEnumFormStringArrayInner>(); // List<TestEnumParametersRequestEnumFormStringArrayInner> | Form parameter enum test (string array) (optional) 
+            var enumHeaderString = (TestEnumParametersEnumHeaderStringParameter) "_abc";  // TestEnumParametersEnumHeaderStringParameter | Header parameter enum test (string) (optional) 
+            var enumHeaderStringArray = new List<TestEnumParametersRequestEnumFormStringArrayInner>(); // List<TestEnumParametersRequestEnumFormStringArrayInner> | Header parameter enum test (string array) (optional) 
+            var enumQueryDouble = (TestEnumParametersEnumQueryDoubleParameter) "1.1";  // TestEnumParametersEnumQueryDoubleParameter | Query parameter enum test (double) (optional) 
+            var enumQueryInteger = (TestEnumParametersEnumQueryIntegerParameter) "1";  // TestEnumParametersEnumQueryIntegerParameter | Query parameter enum test (double) (optional) 
+            var enumQueryString = (TestEnumParametersEnumHeaderStringParameter) "_abc";  // TestEnumParametersEnumHeaderStringParameter | Query parameter enum test (string) (optional) 
+            var enumQueryStringArray = new List<TestEnumParametersRequestEnumFormStringArrayInner>(); // List<TestEnumParametersRequestEnumFormStringArrayInner> | Query parameter enum test (string array) (optional) 
 
             try
             {
                 // To test enum parameters
-                apiInstance.TestEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
+                apiInstance.TestEnumParameters(enumFormString, enumFormStringArray, enumHeaderString, enumHeaderStringArray, enumQueryDouble, enumQueryInteger, enumQueryString, enumQueryStringArray);
             }
             catch (ApiException  e)
             {
@@ -1240,7 +1240,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // To test enum parameters
-    apiInstance.TestEnumParametersWithHttpInfo(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
+    apiInstance.TestEnumParametersWithHttpInfo(enumFormString, enumFormStringArray, enumHeaderString, enumHeaderStringArray, enumQueryDouble, enumQueryInteger, enumQueryString, enumQueryStringArray);
 }
 catch (ApiException e)
 {
@@ -1254,14 +1254,14 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **enumHeaderStringArray** | [**List&lt;TestEnumParametersRequestEnumFormStringArrayInner&gt;**](TestEnumParametersRequestEnumFormStringArrayInner.md) | Header parameter enum test (string array) | [optional]  |
-| **enumHeaderString** | **TestEnumParametersEnumHeaderStringParameter** | Header parameter enum test (string) | [optional]  |
-| **enumQueryStringArray** | [**List&lt;TestEnumParametersRequestEnumFormStringArrayInner&gt;**](TestEnumParametersRequestEnumFormStringArrayInner.md) | Query parameter enum test (string array) | [optional]  |
-| **enumQueryString** | **TestEnumParametersEnumHeaderStringParameter** | Query parameter enum test (string) | [optional]  |
-| **enumQueryInteger** | **TestEnumParametersEnumQueryIntegerParameter** | Query parameter enum test (double) | [optional]  |
-| **enumQueryDouble** | **TestEnumParametersEnumQueryDoubleParameter** | Query parameter enum test (double) | [optional]  |
-| **enumFormStringArray** | [**List&lt;TestEnumParametersRequestEnumFormStringArrayInner&gt;**](TestEnumParametersRequestEnumFormStringArrayInner.md) | Form parameter enum test (string array) | [optional]  |
 | **enumFormString** | **TestEnumParametersRequestEnumFormString** |  | [optional]  |
+| **enumFormStringArray** | [**List&lt;TestEnumParametersRequestEnumFormStringArrayInner&gt;**](TestEnumParametersRequestEnumFormStringArrayInner.md) | Form parameter enum test (string array) | [optional]  |
+| **enumHeaderString** | **TestEnumParametersEnumHeaderStringParameter** | Header parameter enum test (string) | [optional]  |
+| **enumHeaderStringArray** | [**List&lt;TestEnumParametersRequestEnumFormStringArrayInner&gt;**](TestEnumParametersRequestEnumFormStringArrayInner.md) | Header parameter enum test (string array) | [optional]  |
+| **enumQueryDouble** | **TestEnumParametersEnumQueryDoubleParameter** | Query parameter enum test (double) | [optional]  |
+| **enumQueryInteger** | **TestEnumParametersEnumQueryIntegerParameter** | Query parameter enum test (double) | [optional]  |
+| **enumQueryString** | **TestEnumParametersEnumHeaderStringParameter** | Query parameter enum test (string) | [optional]  |
+| **enumQueryStringArray** | [**List&lt;TestEnumParametersRequestEnumFormStringArrayInner&gt;**](TestEnumParametersRequestEnumFormStringArrayInner.md) | Query parameter enum test (string array) | [optional]  |
 
 ### Return type
 
@@ -1287,7 +1287,7 @@ No authorization required
 
 <a id="testgroupparameters"></a>
 # **TestGroupParameters**
-> void TestGroupParameters (int requiredStringGroup, bool requiredBooleanGroup, long requiredInt64Group, int stringGroup = null, bool booleanGroup = null, long int64Group = null)
+> void TestGroupParameters (bool requiredBooleanGroup, long requiredInt64Group, int requiredStringGroup, bool booleanGroup = null, long int64Group = null, int stringGroup = null)
 
 Fake endpoint to test group parameters (optional)
 
@@ -1313,17 +1313,17 @@ namespace Example
             config.AccessToken = "YOUR_BEARER_TOKEN";
 
             var apiInstance = new FakeApi(config);
-            var requiredStringGroup = 56;  // int | Required String in group parameters
             var requiredBooleanGroup = true;  // bool | Required Boolean in group parameters
             var requiredInt64Group = 789L;  // long | Required Integer in group parameters
-            var stringGroup = 56;  // int | String in group parameters (optional) 
+            var requiredStringGroup = 56;  // int | Required String in group parameters
             var booleanGroup = true;  // bool | Boolean in group parameters (optional) 
             var int64Group = 789L;  // long | Integer in group parameters (optional) 
+            var stringGroup = 56;  // int | String in group parameters (optional) 
 
             try
             {
                 // Fake endpoint to test group parameters (optional)
-                apiInstance.TestGroupParameters(requiredStringGroup, requiredBooleanGroup, requiredInt64Group, stringGroup, booleanGroup, int64Group);
+                apiInstance.TestGroupParameters(requiredBooleanGroup, requiredInt64Group, requiredStringGroup, booleanGroup, int64Group, stringGroup);
             }
             catch (ApiException  e)
             {
@@ -1343,7 +1343,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Fake endpoint to test group parameters (optional)
-    apiInstance.TestGroupParametersWithHttpInfo(requiredStringGroup, requiredBooleanGroup, requiredInt64Group, stringGroup, booleanGroup, int64Group);
+    apiInstance.TestGroupParametersWithHttpInfo(requiredBooleanGroup, requiredInt64Group, requiredStringGroup, booleanGroup, int64Group, stringGroup);
 }
 catch (ApiException e)
 {
@@ -1357,12 +1357,12 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **requiredStringGroup** | **int** | Required String in group parameters |  |
 | **requiredBooleanGroup** | **bool** | Required Boolean in group parameters |  |
 | **requiredInt64Group** | **long** | Required Integer in group parameters |  |
-| **stringGroup** | **int** | String in group parameters | [optional]  |
+| **requiredStringGroup** | **int** | Required String in group parameters |  |
 | **booleanGroup** | **bool** | Boolean in group parameters | [optional]  |
 | **int64Group** | **long** | Integer in group parameters | [optional]  |
+| **stringGroup** | **int** | String in group parameters | [optional]  |
 
 ### Return type
 
@@ -1644,7 +1644,7 @@ No authorization required
 
 <a id="testqueryparametercollectionformat"></a>
 # **TestQueryParameterCollectionFormat**
-> void TestQueryParameterCollectionFormat (List<string> pipe, List<string> ioutil, List<string> http, List<string> url, List<string> context, string requiredNotNullable, string requiredNullable, string notRequiredNotNullable = null, string notRequiredNullable = null)
+> void TestQueryParameterCollectionFormat (List<string> context, List<string> http, List<string> ioutil, List<string> pipe, string requiredNotNullable, List<string> url, string notRequiredNotNullable = null, string notRequiredNullable = null, string requiredNullable)
 
 
 
@@ -1667,19 +1667,19 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new FakeApi(config);
-            var pipe = new List<string>(); // List<string> | 
-            var ioutil = new List<string>(); // List<string> | 
-            var http = new List<string>(); // List<string> | 
-            var url = new List<string>(); // List<string> | 
             var context = new List<string>(); // List<string> | 
+            var http = new List<string>(); // List<string> | 
+            var ioutil = new List<string>(); // List<string> | 
+            var pipe = new List<string>(); // List<string> | 
             var requiredNotNullable = "requiredNotNullable_example";  // string | 
-            var requiredNullable = "requiredNullable_example";  // string | 
+            var url = new List<string>(); // List<string> | 
             var notRequiredNotNullable = "notRequiredNotNullable_example";  // string |  (optional) 
             var notRequiredNullable = "notRequiredNullable_example";  // string |  (optional) 
+            var requiredNullable = "requiredNullable_example";  // string | 
 
             try
             {
-                apiInstance.TestQueryParameterCollectionFormat(pipe, ioutil, http, url, context, requiredNotNullable, requiredNullable, notRequiredNotNullable, notRequiredNullable);
+                apiInstance.TestQueryParameterCollectionFormat(context, http, ioutil, pipe, requiredNotNullable, url, notRequiredNotNullable, notRequiredNullable, requiredNullable);
             }
             catch (ApiException  e)
             {
@@ -1698,7 +1698,7 @@ This returns an ApiResponse object which contains the response data, status code
 ```csharp
 try
 {
-    apiInstance.TestQueryParameterCollectionFormatWithHttpInfo(pipe, ioutil, http, url, context, requiredNotNullable, requiredNullable, notRequiredNotNullable, notRequiredNullable);
+    apiInstance.TestQueryParameterCollectionFormatWithHttpInfo(context, http, ioutil, pipe, requiredNotNullable, url, notRequiredNotNullable, notRequiredNullable, requiredNullable);
 }
 catch (ApiException e)
 {
@@ -1712,15 +1712,15 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **pipe** | [**List&lt;string&gt;**](string.md) |  |  |
-| **ioutil** | [**List&lt;string&gt;**](string.md) |  |  |
-| **http** | [**List&lt;string&gt;**](string.md) |  |  |
-| **url** | [**List&lt;string&gt;**](string.md) |  |  |
 | **context** | [**List&lt;string&gt;**](string.md) |  |  |
+| **http** | [**List&lt;string&gt;**](string.md) |  |  |
+| **ioutil** | [**List&lt;string&gt;**](string.md) |  |  |
+| **pipe** | [**List&lt;string&gt;**](string.md) |  |  |
 | **requiredNotNullable** | **string** |  |  |
-| **requiredNullable** | **string** |  |  |
+| **url** | [**List&lt;string&gt;**](string.md) |  |  |
 | **notRequiredNotNullable** | **string** |  | [optional]  |
 | **notRequiredNullable** | **string** |  | [optional]  |
+| **requiredNullable** | **string** |  |  |
 
 ### Return type
 

samples/client/petstore/csharp/generichost/net4.7/FormModels/docs/apis/UserApi.md

@@ -453,7 +453,7 @@ No authorization required
 
 <a id="loginuser"></a>
 # **LoginUser**
-> string LoginUser (string username, string password)
+> string LoginUser (string password, string username)
 
 Logs user into the system
 
@@ -474,13 +474,13 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new UserApi(config);
-            var username = "username_example";  // string | The user name for login
             var password = "password_example";  // string | The password for login in clear text
+            var username = "username_example";  // string | The user name for login
 
             try
             {
                 // Logs user into the system
-                string result = apiInstance.LoginUser(username, password);
+                string result = apiInstance.LoginUser(password, username);
                 Debug.WriteLine(result);
             }
             catch (ApiException  e)
@@ -501,7 +501,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Logs user into the system
-    ApiResponse<string> response = apiInstance.LoginUserWithHttpInfo(username, password);
+    ApiResponse<string> response = apiInstance.LoginUserWithHttpInfo(password, username);
     Debug.Write("Status Code: " + response.StatusCode);
     Debug.Write("Response Headers: " + response.Headers);
     Debug.Write("Response Body: " + response.Data);
@@ -518,8 +518,8 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **username** | **string** | The user name for login |  |
 | **password** | **string** | The password for login in clear text |  |
+| **username** | **string** | The user name for login |  |
 
 ### Return type
 
@@ -625,7 +625,7 @@ No authorization required
 
 <a id="updateuser"></a>
 # **UpdateUser**
-> void UpdateUser (string username, User user)
+> void UpdateUser (User user, string username)
 
 Updated user
 
@@ -648,13 +648,13 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new UserApi(config);
-            var username = "username_example";  // string | name that need to be deleted
             var user = new User(); // User | Updated user object
+            var username = "username_example";  // string | name that need to be deleted
 
             try
             {
                 // Updated user
-                apiInstance.UpdateUser(username, user);
+                apiInstance.UpdateUser(user, username);
             }
             catch (ApiException  e)
             {
@@ -674,7 +674,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Updated user
-    apiInstance.UpdateUserWithHttpInfo(username, user);
+    apiInstance.UpdateUserWithHttpInfo(user, username);
 }
 catch (ApiException e)
 {
@@ -688,8 +688,8 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **username** | **string** | name that need to be deleted |  |
 | **user** | [**User**](User.md) | Updated user object |  |
+| **username** | **string** | name that need to be deleted |  |
 
 ### Return type
 

samples/client/petstore/csharp/generichost/net4.7/FormModels/src/Org.OpenAPITools.Test/Api/FakeApiTests.cs

@@ -193,20 +193,20 @@ namespace Org.OpenAPITools.Test.Api
         public async Task TestEndpointParametersAsyncTest()
         {
             decimal number = default;
-            double varDouble = default;
             string patternWithoutDelimiter = default;
             byte[] varByte = default;
-            Client.Option<int> integer = default;
-            Client.Option<int> int32 = default;
-            Client.Option<long> int64 = default;
-            Client.Option<float> varFloat = default;
-            Client.Option<string> varString = default;
+            double varDouble = default;
             Client.Option<System.IO.Stream> binary = default;
+            Client.Option<string> callback = default;
             Client.Option<DateTime> date = default;
             Client.Option<DateTime> dateTime = default;
+            Client.Option<int> int32 = default;
+            Client.Option<long> int64 = default;
+            Client.Option<int> integer = default;
             Client.Option<string> password = default;
-            Client.Option<string> callback = default;
-            await _instance.TestEndpointParametersAsync(number, varDouble, patternWithoutDelimiter, varByte, integer, int32, int64, varFloat, varString, binary, date, dateTime, password, callback);
+            Client.Option<float> varFloat = default;
+            Client.Option<string> varString = default;
+            await _instance.TestEndpointParametersAsync(number, patternWithoutDelimiter, varByte, varDouble, binary, callback, date, dateTime, int32, int64, integer, password, varFloat, varString);
         }
 
         /// <summary>
@@ -215,15 +215,15 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task TestEnumParametersAsyncTest()
         {
-            Client.Option<List<TestEnumParametersRequestEnumFormStringArrayInner>> enumHeaderStringArray = default;
-            Client.Option<TestEnumParametersEnumHeaderStringParameter> enumHeaderString = default;
-            Client.Option<List<TestEnumParametersRequestEnumFormStringArrayInner>> enumQueryStringArray = default;
-            Client.Option<TestEnumParametersEnumHeaderStringParameter> enumQueryString = default;
-            Client.Option<TestEnumParametersEnumQueryIntegerParameter> enumQueryInteger = default;
-            Client.Option<TestEnumParametersEnumQueryDoubleParameter> enumQueryDouble = default;
-            Client.Option<List<TestEnumParametersRequestEnumFormStringArrayInner>> enumFormStringArray = default;
             Client.Option<TestEnumParametersRequestEnumFormString> enumFormString = default;
-            await _instance.TestEnumParametersAsync(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
+            Client.Option<List<TestEnumParametersRequestEnumFormStringArrayInner>> enumFormStringArray = default;
+            Client.Option<TestEnumParametersEnumHeaderStringParameter> enumHeaderString = default;
+            Client.Option<List<TestEnumParametersRequestEnumFormStringArrayInner>> enumHeaderStringArray = default;
+            Client.Option<TestEnumParametersEnumQueryDoubleParameter> enumQueryDouble = default;
+            Client.Option<TestEnumParametersEnumQueryIntegerParameter> enumQueryInteger = default;
+            Client.Option<TestEnumParametersEnumHeaderStringParameter> enumQueryString = default;
+            Client.Option<List<TestEnumParametersRequestEnumFormStringArrayInner>> enumQueryStringArray = default;
+            await _instance.TestEnumParametersAsync(enumFormString, enumFormStringArray, enumHeaderString, enumHeaderStringArray, enumQueryDouble, enumQueryInteger, enumQueryString, enumQueryStringArray);
         }
 
         /// <summary>
@@ -232,13 +232,13 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task TestGroupParametersAsyncTest()
         {
-            int requiredStringGroup = default;
             bool requiredBooleanGroup = default;
             long requiredInt64Group = default;
-            Client.Option<int> stringGroup = default;
+            int requiredStringGroup = default;
             Client.Option<bool> booleanGroup = default;
             Client.Option<long> int64Group = default;
-            await _instance.TestGroupParametersAsync(requiredStringGroup, requiredBooleanGroup, requiredInt64Group, stringGroup, booleanGroup, int64Group);
+            Client.Option<int> stringGroup = default;
+            await _instance.TestGroupParametersAsync(requiredBooleanGroup, requiredInt64Group, requiredStringGroup, booleanGroup, int64Group, stringGroup);
         }
 
         /// <summary>
@@ -278,16 +278,16 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task TestQueryParameterCollectionFormatAsyncTest()
         {
-            List<string> pipe = default;
-            List<string> ioutil = default;
-            List<string> http = default;
-            List<string> url = default;
             List<string> context = default;
+            List<string> http = default;
+            List<string> ioutil = default;
+            List<string> pipe = default;
             string requiredNotNullable = default;
-            string requiredNullable = default;
+            List<string> url = default;
             Client.Option<string> notRequiredNotNullable = default;
             Client.Option<string> notRequiredNullable = default;
-            await _instance.TestQueryParameterCollectionFormatAsync(pipe, ioutil, http, url, context, requiredNotNullable, requiredNullable, notRequiredNotNullable, notRequiredNullable);
+            string requiredNullable = default;
+            await _instance.TestQueryParameterCollectionFormatAsync(context, http, ioutil, pipe, requiredNotNullable, url, notRequiredNotNullable, notRequiredNullable, requiredNullable);
         }
 
         /// <summary>

samples/client/petstore/csharp/generichost/net4.7/FormModels/src/Org.OpenAPITools.Test/Api/UserApiTests.cs

@@ -108,9 +108,9 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task LoginUserAsyncTest()
         {
-            string username = default;
             string password = default;
-            var response = await _instance.LoginUserAsync(username, password);
+            string username = default;
+            var response = await _instance.LoginUserAsync(password, username);
             var model = response.Ok();
             Assert.IsType<string>(model);
         }
@@ -130,9 +130,9 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task UpdateUserAsyncTest()
         {
-            string username = default;
             User user = default;
-            await _instance.UpdateUserAsync(username, user);
+            string username = default;
+            await _instance.UpdateUserAsync(user, username);
         }
     }
 }

samples/client/petstore/csharp/generichost/net4.7/FormModels/src/Org.OpenAPITools/Api/UserApi.cs

@@ -155,11 +155,11 @@ namespace Org.OpenAPITools.Api
         /// 
         /// </remarks>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        Task<ILoginUserApiResponse> LoginUserAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default);
+        Task<ILoginUserApiResponse> LoginUserAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Logs user into the system
@@ -167,11 +167,11 @@ namespace Org.OpenAPITools.Api
         /// <remarks>
         /// 
         /// </remarks>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        Task<ILoginUserApiResponse> LoginUserOrDefaultAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default);
+        Task<ILoginUserApiResponse> LoginUserOrDefaultAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Logs out current logged in user session
@@ -201,11 +201,11 @@ namespace Org.OpenAPITools.Api
         /// This can only be done by the logged in user.
         /// </remarks>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        Task<IUpdateUserApiResponse> UpdateUserAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default);
+        Task<IUpdateUserApiResponse> UpdateUserAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Updated user
@@ -213,11 +213,11 @@ namespace Org.OpenAPITools.Api
         /// <remarks>
         /// This can only be done by the logged in user.
         /// </remarks>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        Task<IUpdateUserApiResponse> UpdateUserOrDefaultAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default);
+        Task<IUpdateUserApiResponse> UpdateUserOrDefaultAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default);
     }
 
     /// <summary>
@@ -1622,33 +1622,33 @@ namespace Org.OpenAPITools.Api
             partial void OnDeserializationError(ref bool suppressDefaultLog, Exception exception, HttpStatusCode httpStatusCode);
         }
 
-        partial void FormatLoginUser(ref string username, ref string password);
+        partial void FormatLoginUser(ref string password, ref string username);
 
         /// <summary>
         /// Validates the request parameters
         /// </summary>
-        /// <param name="username"></param>
         /// <param name="password"></param>
+        /// <param name="username"></param>
         /// <returns></returns>
-        private void ValidateLoginUser(string username, string password)
+        private void ValidateLoginUser(string password, string username)
         {
-            if (username == null)
-                throw new ArgumentNullException(nameof(username));
-
             if (password == null)
                 throw new ArgumentNullException(nameof(password));
+
+            if (username == null)
+                throw new ArgumentNullException(nameof(username));
         }
 
         /// <summary>
         /// Processes the server response
         /// </summary>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        private void AfterLoginUserDefaultImplementation(ILoginUserApiResponse apiResponseLocalVar, string username, string password)
+        /// <param name="username"></param>
+        private void AfterLoginUserDefaultImplementation(ILoginUserApiResponse apiResponseLocalVar, string password, string username)
         {
             bool suppressDefaultLog = false;
-            AfterLoginUser(ref suppressDefaultLog, apiResponseLocalVar, username, password);
+            AfterLoginUser(ref suppressDefaultLog, apiResponseLocalVar, password, username);
             if (!suppressDefaultLog)
                 Logger.LogInformation("{0,-9} | {1} | {3}", (apiResponseLocalVar.DownloadedAt - apiResponseLocalVar.RequestedAt).TotalSeconds, apiResponseLocalVar.StatusCode, apiResponseLocalVar.Path);
         }
@@ -1658,9 +1658,9 @@ namespace Org.OpenAPITools.Api
         /// </summary>
         /// <param name="suppressDefaultLog"></param>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        partial void AfterLoginUser(ref bool suppressDefaultLog, ILoginUserApiResponse apiResponseLocalVar, string username, string password);
+        /// <param name="username"></param>
+        partial void AfterLoginUser(ref bool suppressDefaultLog, ILoginUserApiResponse apiResponseLocalVar, string password, string username);
 
         /// <summary>
         /// Logs exceptions that occur while retrieving the server response
@@ -1668,12 +1668,12 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        private void OnErrorLoginUserDefaultImplementation(Exception exception, string pathFormat, string path, string username, string password)
+        /// <param name="username"></param>
+        private void OnErrorLoginUserDefaultImplementation(Exception exception, string pathFormat, string path, string password, string username)
         {
             bool suppressDefaultLog = false;
-            OnErrorLoginUser(ref suppressDefaultLog, exception, pathFormat, path, username, password);
+            OnErrorLoginUser(ref suppressDefaultLog, exception, pathFormat, path, password, username);
             if (!suppressDefaultLog)
                 Logger.LogError(exception, "An error occurred while sending the request to the server.");
         }
@@ -1685,22 +1685,22 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        partial void OnErrorLoginUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, string username, string password);
+        /// <param name="username"></param>
+        partial void OnErrorLoginUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, string password, string username);
 
         /// <summary>
         /// Logs user into the system 
         /// </summary>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        public async Task<ILoginUserApiResponse> LoginUserOrDefaultAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<ILoginUserApiResponse> LoginUserOrDefaultAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             try
             {
-                return await LoginUserAsync(username, password, cancellationToken).ConfigureAwait(false);
+                return await LoginUserAsync(password, username, cancellationToken).ConfigureAwait(false);
             }
             catch (Exception)
             {
@@ -1712,19 +1712,19 @@ namespace Org.OpenAPITools.Api
         /// Logs user into the system 
         /// </summary>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        public async Task<ILoginUserApiResponse> LoginUserAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<ILoginUserApiResponse> LoginUserAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             UriBuilder uriBuilderLocalVar = new UriBuilder();
 
             try
             {
-                ValidateLoginUser(username, password);
+                ValidateLoginUser(password, username);
 
-                FormatLoginUser(ref username, ref password);
+                FormatLoginUser(ref password, ref username);
 
                 using (HttpRequestMessage httpRequestMessageLocalVar = new HttpRequestMessage())
                 {
@@ -1735,8 +1735,8 @@ namespace Org.OpenAPITools.Api
 
                     System.Collections.Specialized.NameValueCollection parseQueryStringLocalVar = System.Web.HttpUtility.ParseQueryString(string.Empty);
 
-                    parseQueryStringLocalVar["username"] = ClientUtils.ParameterToString(username);
                     parseQueryStringLocalVar["password"] = ClientUtils.ParameterToString(password);
+                    parseQueryStringLocalVar["username"] = ClientUtils.ParameterToString(username);
 
                     uriBuilderLocalVar.Query = parseQueryStringLocalVar.ToString();
 
@@ -1763,7 +1763,7 @@ namespace Org.OpenAPITools.Api
 
                         LoginUserApiResponse apiResponseLocalVar = new LoginUserApiResponse(apiResponseLoggerLocalVar, httpRequestMessageLocalVar, httpResponseMessageLocalVar, responseContentLocalVar, "/user/login", requestedAtLocalVar, _jsonSerializerOptions);
 
-                        AfterLoginUserDefaultImplementation(apiResponseLocalVar, username, password);
+                        AfterLoginUserDefaultImplementation(apiResponseLocalVar, password, username);
 
                         Events.ExecuteOnLoginUser(apiResponseLocalVar);
 
@@ -1773,7 +1773,7 @@ namespace Org.OpenAPITools.Api
             }
             catch(Exception e)
             {
-                OnErrorLoginUserDefaultImplementation(e, "/user/login", uriBuilderLocalVar.Path, username, password);
+                OnErrorLoginUserDefaultImplementation(e, "/user/login", uriBuilderLocalVar.Path, password, username);
                 Events.ExecuteOnErrorLoginUser(e);
                 throw;
             }
@@ -2014,33 +2014,33 @@ namespace Org.OpenAPITools.Api
             partial void OnDeserializationError(ref bool suppressDefaultLog, Exception exception, HttpStatusCode httpStatusCode);
         }
 
-        partial void FormatUpdateUser(ref string username, User user);
+        partial void FormatUpdateUser(User user, ref string username);
 
         /// <summary>
         /// Validates the request parameters
         /// </summary>
-        /// <param name="username"></param>
         /// <param name="user"></param>
+        /// <param name="username"></param>
         /// <returns></returns>
-        private void ValidateUpdateUser(string username, User user)
+        private void ValidateUpdateUser(User user, string username)
         {
-            if (username == null)
-                throw new ArgumentNullException(nameof(username));
-
             if (user == null)
                 throw new ArgumentNullException(nameof(user));
+
+            if (username == null)
+                throw new ArgumentNullException(nameof(username));
         }
 
         /// <summary>
         /// Processes the server response
         /// </summary>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        private void AfterUpdateUserDefaultImplementation(IUpdateUserApiResponse apiResponseLocalVar, string username, User user)
+        /// <param name="username"></param>
+        private void AfterUpdateUserDefaultImplementation(IUpdateUserApiResponse apiResponseLocalVar, User user, string username)
         {
             bool suppressDefaultLog = false;
-            AfterUpdateUser(ref suppressDefaultLog, apiResponseLocalVar, username, user);
+            AfterUpdateUser(ref suppressDefaultLog, apiResponseLocalVar, user, username);
             if (!suppressDefaultLog)
                 Logger.LogInformation("{0,-9} | {1} | {3}", (apiResponseLocalVar.DownloadedAt - apiResponseLocalVar.RequestedAt).TotalSeconds, apiResponseLocalVar.StatusCode, apiResponseLocalVar.Path);
         }
@@ -2050,9 +2050,9 @@ namespace Org.OpenAPITools.Api
         /// </summary>
         /// <param name="suppressDefaultLog"></param>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        partial void AfterUpdateUser(ref bool suppressDefaultLog, IUpdateUserApiResponse apiResponseLocalVar, string username, User user);
+        /// <param name="username"></param>
+        partial void AfterUpdateUser(ref bool suppressDefaultLog, IUpdateUserApiResponse apiResponseLocalVar, User user, string username);
 
         /// <summary>
         /// Logs exceptions that occur while retrieving the server response
@@ -2060,12 +2060,12 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        private void OnErrorUpdateUserDefaultImplementation(Exception exception, string pathFormat, string path, string username, User user)
+        /// <param name="username"></param>
+        private void OnErrorUpdateUserDefaultImplementation(Exception exception, string pathFormat, string path, User user, string username)
         {
             bool suppressDefaultLog = false;
-            OnErrorUpdateUser(ref suppressDefaultLog, exception, pathFormat, path, username, user);
+            OnErrorUpdateUser(ref suppressDefaultLog, exception, pathFormat, path, user, username);
             if (!suppressDefaultLog)
                 Logger.LogError(exception, "An error occurred while sending the request to the server.");
         }
@@ -2077,22 +2077,22 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        partial void OnErrorUpdateUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, string username, User user);
+        /// <param name="username"></param>
+        partial void OnErrorUpdateUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, User user, string username);
 
         /// <summary>
         /// Updated user This can only be done by the logged in user.
         /// </summary>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        public async Task<IUpdateUserApiResponse> UpdateUserOrDefaultAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<IUpdateUserApiResponse> UpdateUserOrDefaultAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             try
             {
-                return await UpdateUserAsync(username, user, cancellationToken).ConfigureAwait(false);
+                return await UpdateUserAsync(user, username, cancellationToken).ConfigureAwait(false);
             }
             catch (Exception)
             {
@@ -2104,19 +2104,19 @@ namespace Org.OpenAPITools.Api
         /// Updated user This can only be done by the logged in user.
         /// </summary>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        public async Task<IUpdateUserApiResponse> UpdateUserAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<IUpdateUserApiResponse> UpdateUserAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             UriBuilder uriBuilderLocalVar = new UriBuilder();
 
             try
             {
-                ValidateUpdateUser(username, user);
+                ValidateUpdateUser(user, username);
 
-                FormatUpdateUser(ref username, user);
+                FormatUpdateUser(user, ref username);
 
                 using (HttpRequestMessage httpRequestMessageLocalVar = new HttpRequestMessage())
                 {
@@ -2153,7 +2153,7 @@ namespace Org.OpenAPITools.Api
 
                         UpdateUserApiResponse apiResponseLocalVar = new UpdateUserApiResponse(apiResponseLoggerLocalVar, httpRequestMessageLocalVar, httpResponseMessageLocalVar, responseContentLocalVar, "/user/{username}", requestedAtLocalVar, _jsonSerializerOptions);
 
-                        AfterUpdateUserDefaultImplementation(apiResponseLocalVar, username, user);
+                        AfterUpdateUserDefaultImplementation(apiResponseLocalVar, user, username);
 
                         Events.ExecuteOnUpdateUser(apiResponseLocalVar);
 
@@ -2163,7 +2163,7 @@ namespace Org.OpenAPITools.Api
             }
             catch(Exception e)
             {
-                OnErrorUpdateUserDefaultImplementation(e, "/user/{username}", uriBuilderLocalVar.Path, username, user);
+                OnErrorUpdateUserDefaultImplementation(e, "/user/{username}", uriBuilderLocalVar.Path, user, username);
                 Events.ExecuteOnErrorUpdateUser(e);
                 throw;
             }

samples/client/petstore/csharp/generichost/net4.7/Petstore/docs/apis/FakeApi.md

@@ -1067,7 +1067,7 @@ No authorization required
 
 <a id="testendpointparameters"></a>
 # **TestEndpointParameters**
-> void TestEndpointParameters (decimal number, double varDouble, string patternWithoutDelimiter, byte[] varByte, int integer = null, int int32 = null, long int64 = null, float varFloat = null, string varString = null, System.IO.Stream binary = null, DateTime date = null, DateTime dateTime = null, string password = null, string callback = null)
+> void TestEndpointParameters (decimal number, string patternWithoutDelimiter, byte[] varByte, double varDouble, System.IO.Stream binary = null, string callback = null, DateTime date = null, DateTime dateTime = null, int int32 = null, long int64 = null, int integer = null, string password = null, float varFloat = null, string varString = null)
 
 Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
 
@@ -1095,24 +1095,24 @@ namespace Example
 
             var apiInstance = new FakeApi(config);
             var number = 8.14D;  // decimal | None
-            var varDouble = 1.2D;  // double | None
             var patternWithoutDelimiter = "patternWithoutDelimiter_example";  // string | None
             var varByte = System.Text.Encoding.ASCII.GetBytes("BYTE_ARRAY_DATA_HERE");  // byte[] | None
-            var integer = 56;  // int | None (optional) 
-            var int32 = 56;  // int | None (optional) 
-            var int64 = 789L;  // long | None (optional) 
-            var varFloat = 3.4F;  // float | None (optional) 
-            var varString = "varString_example";  // string | None (optional) 
+            var varDouble = 1.2D;  // double | None
             var binary = new System.IO.MemoryStream(System.IO.File.ReadAllBytes("/path/to/file.txt"));  // System.IO.Stream | None (optional) 
+            var callback = "callback_example";  // string | None (optional) 
             var date = DateTime.Parse("2013-10-20");  // DateTime | None (optional) 
             var dateTime = DateTime.Parse(""2010-02-01T10:20:10.111110+01:00"");  // DateTime | None (optional)  (default to "2010-02-01T10:20:10.111110+01:00")
+            var int32 = 56;  // int | None (optional) 
+            var int64 = 789L;  // long | None (optional) 
+            var integer = 56;  // int | None (optional) 
             var password = "password_example";  // string | None (optional) 
-            var callback = "callback_example";  // string | None (optional) 
+            var varFloat = 3.4F;  // float | None (optional) 
+            var varString = "varString_example";  // string | None (optional) 
 
             try
             {
                 // Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
-                apiInstance.TestEndpointParameters(number, varDouble, patternWithoutDelimiter, varByte, integer, int32, int64, varFloat, varString, binary, date, dateTime, password, callback);
+                apiInstance.TestEndpointParameters(number, patternWithoutDelimiter, varByte, varDouble, binary, callback, date, dateTime, int32, int64, integer, password, varFloat, varString);
             }
             catch (ApiException  e)
             {
@@ -1132,7 +1132,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
-    apiInstance.TestEndpointParametersWithHttpInfo(number, varDouble, patternWithoutDelimiter, varByte, integer, int32, int64, varFloat, varString, binary, date, dateTime, password, callback);
+    apiInstance.TestEndpointParametersWithHttpInfo(number, patternWithoutDelimiter, varByte, varDouble, binary, callback, date, dateTime, int32, int64, integer, password, varFloat, varString);
 }
 catch (ApiException e)
 {
@@ -1147,19 +1147,19 @@ catch (ApiException e)
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
 | **number** | **decimal** | None |  |
-| **varDouble** | **double** | None |  |
 | **patternWithoutDelimiter** | **string** | None |  |
 | **varByte** | **byte[]** | None |  |
-| **integer** | **int** | None | [optional]  |
-| **int32** | **int** | None | [optional]  |
-| **int64** | **long** | None | [optional]  |
-| **varFloat** | **float** | None | [optional]  |
-| **varString** | **string** | None | [optional]  |
+| **varDouble** | **double** | None |  |
 | **binary** | **System.IO.Stream****System.IO.Stream** | None | [optional]  |
+| **callback** | **string** | None | [optional]  |
 | **date** | **DateTime** | None | [optional]  |
 | **dateTime** | **DateTime** | None | [optional] [default to &quot;2010-02-01T10:20:10.111110+01:00&quot;] |
+| **int32** | **int** | None | [optional]  |
+| **int64** | **long** | None | [optional]  |
+| **integer** | **int** | None | [optional]  |
 | **password** | **string** | None | [optional]  |
-| **callback** | **string** | None | [optional]  |
+| **varFloat** | **float** | None | [optional]  |
+| **varString** | **string** | None | [optional]  |
 
 ### Return type
 
@@ -1185,7 +1185,7 @@ void (empty response body)
 
 <a id="testenumparameters"></a>
 # **TestEnumParameters**
-> void TestEnumParameters (List<string> enumHeaderStringArray = null, string enumHeaderString = null, List<string> enumQueryStringArray = null, string enumQueryString = null, int enumQueryInteger = null, double enumQueryDouble = null, List<string> enumFormStringArray = null, string enumFormString = null)
+> void TestEnumParameters (string enumFormString = null, List<string> enumFormStringArray = null, string enumHeaderString = null, List<string> enumHeaderStringArray = null, double enumQueryDouble = null, int enumQueryInteger = null, string enumQueryString = null, List<string> enumQueryStringArray = null)
 
 To test enum parameters
 
@@ -1208,19 +1208,19 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new FakeApi(config);
-            var enumHeaderStringArray = new List<string>(); // List<string> | Header parameter enum test (string array) (optional) 
-            var enumHeaderString = "_abc";  // string | Header parameter enum test (string) (optional)  (default to -efg)
-            var enumQueryStringArray = new List<string>(); // List<string> | Query parameter enum test (string array) (optional) 
-            var enumQueryString = "_abc";  // string | Query parameter enum test (string) (optional)  (default to -efg)
-            var enumQueryInteger = 1;  // int | Query parameter enum test (double) (optional) 
-            var enumQueryDouble = 1.1D;  // double | Query parameter enum test (double) (optional) 
-            var enumFormStringArray = new List<string>(); // List<string> | Form parameter enum test (string array) (optional)  (default to $)
             var enumFormString = "_abc";  // string | Form parameter enum test (string) (optional)  (default to -efg)
+            var enumFormStringArray = new List<string>(); // List<string> | Form parameter enum test (string array) (optional)  (default to $)
+            var enumHeaderString = "_abc";  // string | Header parameter enum test (string) (optional)  (default to -efg)
+            var enumHeaderStringArray = new List<string>(); // List<string> | Header parameter enum test (string array) (optional) 
+            var enumQueryDouble = 1.1D;  // double | Query parameter enum test (double) (optional) 
+            var enumQueryInteger = 1;  // int | Query parameter enum test (double) (optional) 
+            var enumQueryString = "_abc";  // string | Query parameter enum test (string) (optional)  (default to -efg)
+            var enumQueryStringArray = new List<string>(); // List<string> | Query parameter enum test (string array) (optional) 
 
             try
             {
                 // To test enum parameters
-                apiInstance.TestEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
+                apiInstance.TestEnumParameters(enumFormString, enumFormStringArray, enumHeaderString, enumHeaderStringArray, enumQueryDouble, enumQueryInteger, enumQueryString, enumQueryStringArray);
             }
             catch (ApiException  e)
             {
@@ -1240,7 +1240,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // To test enum parameters
-    apiInstance.TestEnumParametersWithHttpInfo(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
+    apiInstance.TestEnumParametersWithHttpInfo(enumFormString, enumFormStringArray, enumHeaderString, enumHeaderStringArray, enumQueryDouble, enumQueryInteger, enumQueryString, enumQueryStringArray);
 }
 catch (ApiException e)
 {
@@ -1254,14 +1254,14 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **enumHeaderStringArray** | [**List&lt;string&gt;**](string.md) | Header parameter enum test (string array) | [optional]  |
-| **enumHeaderString** | **string** | Header parameter enum test (string) | [optional] [default to -efg] |
-| **enumQueryStringArray** | [**List&lt;string&gt;**](string.md) | Query parameter enum test (string array) | [optional]  |
-| **enumQueryString** | **string** | Query parameter enum test (string) | [optional] [default to -efg] |
-| **enumQueryInteger** | **int** | Query parameter enum test (double) | [optional]  |
-| **enumQueryDouble** | **double** | Query parameter enum test (double) | [optional]  |
-| **enumFormStringArray** | [**List&lt;string&gt;**](string.md) | Form parameter enum test (string array) | [optional] [default to $] |
 | **enumFormString** | **string** | Form parameter enum test (string) | [optional] [default to -efg] |
+| **enumFormStringArray** | [**List&lt;string&gt;**](string.md) | Form parameter enum test (string array) | [optional] [default to $] |
+| **enumHeaderString** | **string** | Header parameter enum test (string) | [optional] [default to -efg] |
+| **enumHeaderStringArray** | [**List&lt;string&gt;**](string.md) | Header parameter enum test (string array) | [optional]  |
+| **enumQueryDouble** | **double** | Query parameter enum test (double) | [optional]  |
+| **enumQueryInteger** | **int** | Query parameter enum test (double) | [optional]  |
+| **enumQueryString** | **string** | Query parameter enum test (string) | [optional] [default to -efg] |
+| **enumQueryStringArray** | [**List&lt;string&gt;**](string.md) | Query parameter enum test (string array) | [optional]  |
 
 ### Return type
 
@@ -1287,7 +1287,7 @@ No authorization required
 
 <a id="testgroupparameters"></a>
 # **TestGroupParameters**
-> void TestGroupParameters (int requiredStringGroup, bool requiredBooleanGroup, long requiredInt64Group, int stringGroup = null, bool booleanGroup = null, long int64Group = null)
+> void TestGroupParameters (bool requiredBooleanGroup, long requiredInt64Group, int requiredStringGroup, bool booleanGroup = null, long int64Group = null, int stringGroup = null)
 
 Fake endpoint to test group parameters (optional)
 
@@ -1313,17 +1313,17 @@ namespace Example
             config.AccessToken = "YOUR_BEARER_TOKEN";
 
             var apiInstance = new FakeApi(config);
-            var requiredStringGroup = 56;  // int | Required String in group parameters
             var requiredBooleanGroup = true;  // bool | Required Boolean in group parameters
             var requiredInt64Group = 789L;  // long | Required Integer in group parameters
-            var stringGroup = 56;  // int | String in group parameters (optional) 
+            var requiredStringGroup = 56;  // int | Required String in group parameters
             var booleanGroup = true;  // bool | Boolean in group parameters (optional) 
             var int64Group = 789L;  // long | Integer in group parameters (optional) 
+            var stringGroup = 56;  // int | String in group parameters (optional) 
 
             try
             {
                 // Fake endpoint to test group parameters (optional)
-                apiInstance.TestGroupParameters(requiredStringGroup, requiredBooleanGroup, requiredInt64Group, stringGroup, booleanGroup, int64Group);
+                apiInstance.TestGroupParameters(requiredBooleanGroup, requiredInt64Group, requiredStringGroup, booleanGroup, int64Group, stringGroup);
             }
             catch (ApiException  e)
             {
@@ -1343,7 +1343,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Fake endpoint to test group parameters (optional)
-    apiInstance.TestGroupParametersWithHttpInfo(requiredStringGroup, requiredBooleanGroup, requiredInt64Group, stringGroup, booleanGroup, int64Group);
+    apiInstance.TestGroupParametersWithHttpInfo(requiredBooleanGroup, requiredInt64Group, requiredStringGroup, booleanGroup, int64Group, stringGroup);
 }
 catch (ApiException e)
 {
@@ -1357,12 +1357,12 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **requiredStringGroup** | **int** | Required String in group parameters |  |
 | **requiredBooleanGroup** | **bool** | Required Boolean in group parameters |  |
 | **requiredInt64Group** | **long** | Required Integer in group parameters |  |
-| **stringGroup** | **int** | String in group parameters | [optional]  |
+| **requiredStringGroup** | **int** | Required String in group parameters |  |
 | **booleanGroup** | **bool** | Boolean in group parameters | [optional]  |
 | **int64Group** | **long** | Integer in group parameters | [optional]  |
+| **stringGroup** | **int** | String in group parameters | [optional]  |
 
 ### Return type
 
@@ -1644,7 +1644,7 @@ No authorization required
 
 <a id="testqueryparametercollectionformat"></a>
 # **TestQueryParameterCollectionFormat**
-> void TestQueryParameterCollectionFormat (List<string> pipe, List<string> ioutil, List<string> http, List<string> url, List<string> context, string requiredNotNullable, string requiredNullable, string notRequiredNotNullable = null, string notRequiredNullable = null)
+> void TestQueryParameterCollectionFormat (List<string> context, List<string> http, List<string> ioutil, List<string> pipe, string requiredNotNullable, List<string> url, string notRequiredNotNullable = null, string notRequiredNullable = null, string requiredNullable)
 
 
 
@@ -1667,19 +1667,19 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new FakeApi(config);
-            var pipe = new List<string>(); // List<string> | 
-            var ioutil = new List<string>(); // List<string> | 
-            var http = new List<string>(); // List<string> | 
-            var url = new List<string>(); // List<string> | 
             var context = new List<string>(); // List<string> | 
+            var http = new List<string>(); // List<string> | 
+            var ioutil = new List<string>(); // List<string> | 
+            var pipe = new List<string>(); // List<string> | 
             var requiredNotNullable = "requiredNotNullable_example";  // string | 
-            var requiredNullable = "requiredNullable_example";  // string | 
+            var url = new List<string>(); // List<string> | 
             var notRequiredNotNullable = "notRequiredNotNullable_example";  // string |  (optional) 
             var notRequiredNullable = "notRequiredNullable_example";  // string |  (optional) 
+            var requiredNullable = "requiredNullable_example";  // string | 
 
             try
             {
-                apiInstance.TestQueryParameterCollectionFormat(pipe, ioutil, http, url, context, requiredNotNullable, requiredNullable, notRequiredNotNullable, notRequiredNullable);
+                apiInstance.TestQueryParameterCollectionFormat(context, http, ioutil, pipe, requiredNotNullable, url, notRequiredNotNullable, notRequiredNullable, requiredNullable);
             }
             catch (ApiException  e)
             {
@@ -1698,7 +1698,7 @@ This returns an ApiResponse object which contains the response data, status code
 ```csharp
 try
 {
-    apiInstance.TestQueryParameterCollectionFormatWithHttpInfo(pipe, ioutil, http, url, context, requiredNotNullable, requiredNullable, notRequiredNotNullable, notRequiredNullable);
+    apiInstance.TestQueryParameterCollectionFormatWithHttpInfo(context, http, ioutil, pipe, requiredNotNullable, url, notRequiredNotNullable, notRequiredNullable, requiredNullable);
 }
 catch (ApiException e)
 {
@@ -1712,15 +1712,15 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **pipe** | [**List&lt;string&gt;**](string.md) |  |  |
-| **ioutil** | [**List&lt;string&gt;**](string.md) |  |  |
-| **http** | [**List&lt;string&gt;**](string.md) |  |  |
-| **url** | [**List&lt;string&gt;**](string.md) |  |  |
 | **context** | [**List&lt;string&gt;**](string.md) |  |  |
+| **http** | [**List&lt;string&gt;**](string.md) |  |  |
+| **ioutil** | [**List&lt;string&gt;**](string.md) |  |  |
+| **pipe** | [**List&lt;string&gt;**](string.md) |  |  |
 | **requiredNotNullable** | **string** |  |  |
-| **requiredNullable** | **string** |  |  |
+| **url** | [**List&lt;string&gt;**](string.md) |  |  |
 | **notRequiredNotNullable** | **string** |  | [optional]  |
 | **notRequiredNullable** | **string** |  | [optional]  |
+| **requiredNullable** | **string** |  |  |
 
 ### Return type
 

samples/client/petstore/csharp/generichost/net4.7/Petstore/docs/apis/UserApi.md

@@ -453,7 +453,7 @@ No authorization required
 
 <a id="loginuser"></a>
 # **LoginUser**
-> string LoginUser (string username, string password)
+> string LoginUser (string password, string username)
 
 Logs user into the system
 
@@ -474,13 +474,13 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new UserApi(config);
-            var username = "username_example";  // string | The user name for login
             var password = "password_example";  // string | The password for login in clear text
+            var username = "username_example";  // string | The user name for login
 
             try
             {
                 // Logs user into the system
-                string result = apiInstance.LoginUser(username, password);
+                string result = apiInstance.LoginUser(password, username);
                 Debug.WriteLine(result);
             }
             catch (ApiException  e)
@@ -501,7 +501,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Logs user into the system
-    ApiResponse<string> response = apiInstance.LoginUserWithHttpInfo(username, password);
+    ApiResponse<string> response = apiInstance.LoginUserWithHttpInfo(password, username);
     Debug.Write("Status Code: " + response.StatusCode);
     Debug.Write("Response Headers: " + response.Headers);
     Debug.Write("Response Body: " + response.Data);
@@ -518,8 +518,8 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **username** | **string** | The user name for login |  |
 | **password** | **string** | The password for login in clear text |  |
+| **username** | **string** | The user name for login |  |
 
 ### Return type
 
@@ -625,7 +625,7 @@ No authorization required
 
 <a id="updateuser"></a>
 # **UpdateUser**
-> void UpdateUser (string username, User user)
+> void UpdateUser (User user, string username)
 
 Updated user
 
@@ -648,13 +648,13 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new UserApi(config);
-            var username = "username_example";  // string | name that need to be deleted
             var user = new User(); // User | Updated user object
+            var username = "username_example";  // string | name that need to be deleted
 
             try
             {
                 // Updated user
-                apiInstance.UpdateUser(username, user);
+                apiInstance.UpdateUser(user, username);
             }
             catch (ApiException  e)
             {
@@ -674,7 +674,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Updated user
-    apiInstance.UpdateUserWithHttpInfo(username, user);
+    apiInstance.UpdateUserWithHttpInfo(user, username);
 }
 catch (ApiException e)
 {
@@ -688,8 +688,8 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **username** | **string** | name that need to be deleted |  |
 | **user** | [**User**](User.md) | Updated user object |  |
+| **username** | **string** | name that need to be deleted |  |
 
 ### Return type
 

samples/client/petstore/csharp/generichost/net4.7/Petstore/src/Org.OpenAPITools.Test/Api/FakeApiTests.cs

@@ -193,20 +193,20 @@ namespace Org.OpenAPITools.Test.Api
         public async Task TestEndpointParametersAsyncTest()
         {
             decimal number = default;
-            double varDouble = default;
             string patternWithoutDelimiter = default;
             byte[] varByte = default;
-            Client.Option<int> integer = default;
-            Client.Option<int> int32 = default;
-            Client.Option<long> int64 = default;
-            Client.Option<float> varFloat = default;
-            Client.Option<string> varString = default;
+            double varDouble = default;
             Client.Option<System.IO.Stream> binary = default;
+            Client.Option<string> callback = default;
             Client.Option<DateTime> date = default;
             Client.Option<DateTime> dateTime = default;
+            Client.Option<int> int32 = default;
+            Client.Option<long> int64 = default;
+            Client.Option<int> integer = default;
             Client.Option<string> password = default;
-            Client.Option<string> callback = default;
-            await _instance.TestEndpointParametersAsync(number, varDouble, patternWithoutDelimiter, varByte, integer, int32, int64, varFloat, varString, binary, date, dateTime, password, callback);
+            Client.Option<float> varFloat = default;
+            Client.Option<string> varString = default;
+            await _instance.TestEndpointParametersAsync(number, patternWithoutDelimiter, varByte, varDouble, binary, callback, date, dateTime, int32, int64, integer, password, varFloat, varString);
         }
 
         /// <summary>
@@ -215,15 +215,15 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task TestEnumParametersAsyncTest()
         {
-            Client.Option<List<string>> enumHeaderStringArray = default;
-            Client.Option<string> enumHeaderString = default;
-            Client.Option<List<string>> enumQueryStringArray = default;
-            Client.Option<string> enumQueryString = default;
-            Client.Option<int> enumQueryInteger = default;
-            Client.Option<double> enumQueryDouble = default;
-            Client.Option<List<string>> enumFormStringArray = default;
             Client.Option<string> enumFormString = default;
-            await _instance.TestEnumParametersAsync(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
+            Client.Option<List<string>> enumFormStringArray = default;
+            Client.Option<string> enumHeaderString = default;
+            Client.Option<List<string>> enumHeaderStringArray = default;
+            Client.Option<double> enumQueryDouble = default;
+            Client.Option<int> enumQueryInteger = default;
+            Client.Option<string> enumQueryString = default;
+            Client.Option<List<string>> enumQueryStringArray = default;
+            await _instance.TestEnumParametersAsync(enumFormString, enumFormStringArray, enumHeaderString, enumHeaderStringArray, enumQueryDouble, enumQueryInteger, enumQueryString, enumQueryStringArray);
         }
 
         /// <summary>
@@ -232,13 +232,13 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task TestGroupParametersAsyncTest()
         {
-            int requiredStringGroup = default;
             bool requiredBooleanGroup = default;
             long requiredInt64Group = default;
-            Client.Option<int> stringGroup = default;
+            int requiredStringGroup = default;
             Client.Option<bool> booleanGroup = default;
             Client.Option<long> int64Group = default;
-            await _instance.TestGroupParametersAsync(requiredStringGroup, requiredBooleanGroup, requiredInt64Group, stringGroup, booleanGroup, int64Group);
+            Client.Option<int> stringGroup = default;
+            await _instance.TestGroupParametersAsync(requiredBooleanGroup, requiredInt64Group, requiredStringGroup, booleanGroup, int64Group, stringGroup);
         }
 
         /// <summary>
@@ -278,16 +278,16 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task TestQueryParameterCollectionFormatAsyncTest()
         {
-            List<string> pipe = default;
-            List<string> ioutil = default;
-            List<string> http = default;
-            List<string> url = default;
             List<string> context = default;
+            List<string> http = default;
+            List<string> ioutil = default;
+            List<string> pipe = default;
             string requiredNotNullable = default;
-            string requiredNullable = default;
+            List<string> url = default;
             Client.Option<string> notRequiredNotNullable = default;
             Client.Option<string> notRequiredNullable = default;
-            await _instance.TestQueryParameterCollectionFormatAsync(pipe, ioutil, http, url, context, requiredNotNullable, requiredNullable, notRequiredNotNullable, notRequiredNullable);
+            string requiredNullable = default;
+            await _instance.TestQueryParameterCollectionFormatAsync(context, http, ioutil, pipe, requiredNotNullable, url, notRequiredNotNullable, notRequiredNullable, requiredNullable);
         }
 
         /// <summary>

samples/client/petstore/csharp/generichost/net4.7/Petstore/src/Org.OpenAPITools.Test/Api/UserApiTests.cs

@@ -108,9 +108,9 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task LoginUserAsyncTest()
         {
-            string username = default;
             string password = default;
-            var response = await _instance.LoginUserAsync(username, password);
+            string username = default;
+            var response = await _instance.LoginUserAsync(password, username);
             var model = response.Ok();
             Assert.IsType<string>(model);
         }
@@ -130,9 +130,9 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task UpdateUserAsyncTest()
         {
-            string username = default;
             User user = default;
-            await _instance.UpdateUserAsync(username, user);
+            string username = default;
+            await _instance.UpdateUserAsync(user, username);
         }
     }
 }

samples/client/petstore/csharp/generichost/net4.7/Petstore/src/Org.OpenAPITools/Api/UserApi.cs

@@ -155,11 +155,11 @@ namespace Org.OpenAPITools.Api
         /// 
         /// </remarks>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        Task<ILoginUserApiResponse> LoginUserAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default);
+        Task<ILoginUserApiResponse> LoginUserAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Logs user into the system
@@ -167,11 +167,11 @@ namespace Org.OpenAPITools.Api
         /// <remarks>
         /// 
         /// </remarks>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        Task<ILoginUserApiResponse> LoginUserOrDefaultAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default);
+        Task<ILoginUserApiResponse> LoginUserOrDefaultAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Logs out current logged in user session
@@ -201,11 +201,11 @@ namespace Org.OpenAPITools.Api
         /// This can only be done by the logged in user.
         /// </remarks>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        Task<IUpdateUserApiResponse> UpdateUserAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default);
+        Task<IUpdateUserApiResponse> UpdateUserAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Updated user
@@ -213,11 +213,11 @@ namespace Org.OpenAPITools.Api
         /// <remarks>
         /// This can only be done by the logged in user.
         /// </remarks>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        Task<IUpdateUserApiResponse> UpdateUserOrDefaultAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default);
+        Task<IUpdateUserApiResponse> UpdateUserOrDefaultAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default);
     }
 
     /// <summary>
@@ -1622,33 +1622,33 @@ namespace Org.OpenAPITools.Api
             partial void OnDeserializationError(ref bool suppressDefaultLog, Exception exception, HttpStatusCode httpStatusCode);
         }
 
-        partial void FormatLoginUser(ref string username, ref string password);
+        partial void FormatLoginUser(ref string password, ref string username);
 
         /// <summary>
         /// Validates the request parameters
         /// </summary>
-        /// <param name="username"></param>
         /// <param name="password"></param>
+        /// <param name="username"></param>
         /// <returns></returns>
-        private void ValidateLoginUser(string username, string password)
+        private void ValidateLoginUser(string password, string username)
         {
-            if (username == null)
-                throw new ArgumentNullException(nameof(username));
-
             if (password == null)
                 throw new ArgumentNullException(nameof(password));
+
+            if (username == null)
+                throw new ArgumentNullException(nameof(username));
         }
 
         /// <summary>
         /// Processes the server response
         /// </summary>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        private void AfterLoginUserDefaultImplementation(ILoginUserApiResponse apiResponseLocalVar, string username, string password)
+        /// <param name="username"></param>
+        private void AfterLoginUserDefaultImplementation(ILoginUserApiResponse apiResponseLocalVar, string password, string username)
         {
             bool suppressDefaultLog = false;
-            AfterLoginUser(ref suppressDefaultLog, apiResponseLocalVar, username, password);
+            AfterLoginUser(ref suppressDefaultLog, apiResponseLocalVar, password, username);
             if (!suppressDefaultLog)
                 Logger.LogInformation("{0,-9} | {1} | {3}", (apiResponseLocalVar.DownloadedAt - apiResponseLocalVar.RequestedAt).TotalSeconds, apiResponseLocalVar.StatusCode, apiResponseLocalVar.Path);
         }
@@ -1658,9 +1658,9 @@ namespace Org.OpenAPITools.Api
         /// </summary>
         /// <param name="suppressDefaultLog"></param>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        partial void AfterLoginUser(ref bool suppressDefaultLog, ILoginUserApiResponse apiResponseLocalVar, string username, string password);
+        /// <param name="username"></param>
+        partial void AfterLoginUser(ref bool suppressDefaultLog, ILoginUserApiResponse apiResponseLocalVar, string password, string username);
 
         /// <summary>
         /// Logs exceptions that occur while retrieving the server response
@@ -1668,12 +1668,12 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        private void OnErrorLoginUserDefaultImplementation(Exception exception, string pathFormat, string path, string username, string password)
+        /// <param name="username"></param>
+        private void OnErrorLoginUserDefaultImplementation(Exception exception, string pathFormat, string path, string password, string username)
         {
             bool suppressDefaultLog = false;
-            OnErrorLoginUser(ref suppressDefaultLog, exception, pathFormat, path, username, password);
+            OnErrorLoginUser(ref suppressDefaultLog, exception, pathFormat, path, password, username);
             if (!suppressDefaultLog)
                 Logger.LogError(exception, "An error occurred while sending the request to the server.");
         }
@@ -1685,22 +1685,22 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        partial void OnErrorLoginUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, string username, string password);
+        /// <param name="username"></param>
+        partial void OnErrorLoginUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, string password, string username);
 
         /// <summary>
         /// Logs user into the system 
         /// </summary>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        public async Task<ILoginUserApiResponse> LoginUserOrDefaultAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<ILoginUserApiResponse> LoginUserOrDefaultAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             try
             {
-                return await LoginUserAsync(username, password, cancellationToken).ConfigureAwait(false);
+                return await LoginUserAsync(password, username, cancellationToken).ConfigureAwait(false);
             }
             catch (Exception)
             {
@@ -1712,19 +1712,19 @@ namespace Org.OpenAPITools.Api
         /// Logs user into the system 
         /// </summary>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        public async Task<ILoginUserApiResponse> LoginUserAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<ILoginUserApiResponse> LoginUserAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             UriBuilder uriBuilderLocalVar = new UriBuilder();
 
             try
             {
-                ValidateLoginUser(username, password);
+                ValidateLoginUser(password, username);
 
-                FormatLoginUser(ref username, ref password);
+                FormatLoginUser(ref password, ref username);
 
                 using (HttpRequestMessage httpRequestMessageLocalVar = new HttpRequestMessage())
                 {
@@ -1735,8 +1735,8 @@ namespace Org.OpenAPITools.Api
 
                     System.Collections.Specialized.NameValueCollection parseQueryStringLocalVar = System.Web.HttpUtility.ParseQueryString(string.Empty);
 
-                    parseQueryStringLocalVar["username"] = ClientUtils.ParameterToString(username);
                     parseQueryStringLocalVar["password"] = ClientUtils.ParameterToString(password);
+                    parseQueryStringLocalVar["username"] = ClientUtils.ParameterToString(username);
 
                     uriBuilderLocalVar.Query = parseQueryStringLocalVar.ToString();
 
@@ -1763,7 +1763,7 @@ namespace Org.OpenAPITools.Api
 
                         LoginUserApiResponse apiResponseLocalVar = new LoginUserApiResponse(apiResponseLoggerLocalVar, httpRequestMessageLocalVar, httpResponseMessageLocalVar, responseContentLocalVar, "/user/login", requestedAtLocalVar, _jsonSerializerOptions);
 
-                        AfterLoginUserDefaultImplementation(apiResponseLocalVar, username, password);
+                        AfterLoginUserDefaultImplementation(apiResponseLocalVar, password, username);
 
                         Events.ExecuteOnLoginUser(apiResponseLocalVar);
 
@@ -1773,7 +1773,7 @@ namespace Org.OpenAPITools.Api
             }
             catch(Exception e)
             {
-                OnErrorLoginUserDefaultImplementation(e, "/user/login", uriBuilderLocalVar.Path, username, password);
+                OnErrorLoginUserDefaultImplementation(e, "/user/login", uriBuilderLocalVar.Path, password, username);
                 Events.ExecuteOnErrorLoginUser(e);
                 throw;
             }
@@ -2014,33 +2014,33 @@ namespace Org.OpenAPITools.Api
             partial void OnDeserializationError(ref bool suppressDefaultLog, Exception exception, HttpStatusCode httpStatusCode);
         }
 
-        partial void FormatUpdateUser(ref string username, User user);
+        partial void FormatUpdateUser(User user, ref string username);
 
         /// <summary>
         /// Validates the request parameters
         /// </summary>
-        /// <param name="username"></param>
         /// <param name="user"></param>
+        /// <param name="username"></param>
         /// <returns></returns>
-        private void ValidateUpdateUser(string username, User user)
+        private void ValidateUpdateUser(User user, string username)
         {
-            if (username == null)
-                throw new ArgumentNullException(nameof(username));
-
             if (user == null)
                 throw new ArgumentNullException(nameof(user));
+
+            if (username == null)
+                throw new ArgumentNullException(nameof(username));
         }
 
         /// <summary>
         /// Processes the server response
         /// </summary>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        private void AfterUpdateUserDefaultImplementation(IUpdateUserApiResponse apiResponseLocalVar, string username, User user)
+        /// <param name="username"></param>
+        private void AfterUpdateUserDefaultImplementation(IUpdateUserApiResponse apiResponseLocalVar, User user, string username)
         {
             bool suppressDefaultLog = false;
-            AfterUpdateUser(ref suppressDefaultLog, apiResponseLocalVar, username, user);
+            AfterUpdateUser(ref suppressDefaultLog, apiResponseLocalVar, user, username);
             if (!suppressDefaultLog)
                 Logger.LogInformation("{0,-9} | {1} | {3}", (apiResponseLocalVar.DownloadedAt - apiResponseLocalVar.RequestedAt).TotalSeconds, apiResponseLocalVar.StatusCode, apiResponseLocalVar.Path);
         }
@@ -2050,9 +2050,9 @@ namespace Org.OpenAPITools.Api
         /// </summary>
         /// <param name="suppressDefaultLog"></param>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        partial void AfterUpdateUser(ref bool suppressDefaultLog, IUpdateUserApiResponse apiResponseLocalVar, string username, User user);
+        /// <param name="username"></param>
+        partial void AfterUpdateUser(ref bool suppressDefaultLog, IUpdateUserApiResponse apiResponseLocalVar, User user, string username);
 
         /// <summary>
         /// Logs exceptions that occur while retrieving the server response
@@ -2060,12 +2060,12 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        private void OnErrorUpdateUserDefaultImplementation(Exception exception, string pathFormat, string path, string username, User user)
+        /// <param name="username"></param>
+        private void OnErrorUpdateUserDefaultImplementation(Exception exception, string pathFormat, string path, User user, string username)
         {
             bool suppressDefaultLog = false;
-            OnErrorUpdateUser(ref suppressDefaultLog, exception, pathFormat, path, username, user);
+            OnErrorUpdateUser(ref suppressDefaultLog, exception, pathFormat, path, user, username);
             if (!suppressDefaultLog)
                 Logger.LogError(exception, "An error occurred while sending the request to the server.");
         }
@@ -2077,22 +2077,22 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        partial void OnErrorUpdateUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, string username, User user);
+        /// <param name="username"></param>
+        partial void OnErrorUpdateUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, User user, string username);
 
         /// <summary>
         /// Updated user This can only be done by the logged in user.
         /// </summary>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        public async Task<IUpdateUserApiResponse> UpdateUserOrDefaultAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<IUpdateUserApiResponse> UpdateUserOrDefaultAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             try
             {
-                return await UpdateUserAsync(username, user, cancellationToken).ConfigureAwait(false);
+                return await UpdateUserAsync(user, username, cancellationToken).ConfigureAwait(false);
             }
             catch (Exception)
             {
@@ -2104,19 +2104,19 @@ namespace Org.OpenAPITools.Api
         /// Updated user This can only be done by the logged in user.
         /// </summary>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        public async Task<IUpdateUserApiResponse> UpdateUserAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<IUpdateUserApiResponse> UpdateUserAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             UriBuilder uriBuilderLocalVar = new UriBuilder();
 
             try
             {
-                ValidateUpdateUser(username, user);
+                ValidateUpdateUser(user, username);
 
-                FormatUpdateUser(ref username, user);
+                FormatUpdateUser(user, ref username);
 
                 using (HttpRequestMessage httpRequestMessageLocalVar = new HttpRequestMessage())
                 {
@@ -2153,7 +2153,7 @@ namespace Org.OpenAPITools.Api
 
                         UpdateUserApiResponse apiResponseLocalVar = new UpdateUserApiResponse(apiResponseLoggerLocalVar, httpRequestMessageLocalVar, httpResponseMessageLocalVar, responseContentLocalVar, "/user/{username}", requestedAtLocalVar, _jsonSerializerOptions);
 
-                        AfterUpdateUserDefaultImplementation(apiResponseLocalVar, username, user);
+                        AfterUpdateUserDefaultImplementation(apiResponseLocalVar, user, username);
 
                         Events.ExecuteOnUpdateUser(apiResponseLocalVar);
 
@@ -2163,7 +2163,7 @@ namespace Org.OpenAPITools.Api
             }
             catch(Exception e)
             {
-                OnErrorUpdateUserDefaultImplementation(e, "/user/{username}", uriBuilderLocalVar.Path, username, user);
+                OnErrorUpdateUserDefaultImplementation(e, "/user/{username}", uriBuilderLocalVar.Path, user, username);
                 Events.ExecuteOnErrorUpdateUser(e);
                 throw;
             }

samples/client/petstore/csharp/generichost/net4.8/AllOf/docs/models/Adult.md

@@ -5,9 +5,9 @@ A representation of an adult
 
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
-**Type** | **string** |  | [optional] 
-**LastName** | **string** |  | [optional] 
 **FirstName** | **string** |  | [optional] 
+**LastName** | **string** |  | [optional] 
+**Type** | **string** |  | [optional] 
 **Children** | [**List<Child>**](Child.md) |  | [optional] 
 
 [[Back to Model list]](../../README.md#documentation-for-models) [[Back to API list]](../../README.md#documentation-for-api-endpoints) [[Back to README]](../../README.md)

samples/client/petstore/csharp/generichost/net4.8/AllOf/docs/models/Child.md

@@ -5,11 +5,11 @@ A representation of a child
 
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
-**Type** | **string** |  | [optional] 
-**LastName** | **string** |  | [optional] 
 **FirstName** | **string** |  | [optional] 
-**BoosterSeat** | **bool** |  | [optional] 
+**LastName** | **string** |  | [optional] 
+**Type** | **string** |  | [optional] 
 **Age** | **int** |  | [optional] 
+**BoosterSeat** | **bool** |  | [optional] 
 
 [[Back to Model list]](../../README.md#documentation-for-models) [[Back to API list]](../../README.md#documentation-for-api-endpoints) [[Back to README]](../../README.md)
 

samples/client/petstore/csharp/generichost/net4.8/AllOf/docs/models/Person.md

@@ -4,9 +4,9 @@
 
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
-**Type** | **string** |  | [optional] 
-**LastName** | **string** |  | [optional] 
 **FirstName** | **string** |  | [optional] 
+**LastName** | **string** |  | [optional] 
+**Type** | **string** |  | [optional] 
 
 [[Back to Model list]](../../README.md#documentation-for-models) [[Back to API list]](../../README.md#documentation-for-api-endpoints) [[Back to README]](../../README.md)
 

samples/client/petstore/csharp/generichost/net4.8/AllOf/src/Org.OpenAPITools.Test/Model/ChildTests.cs

@@ -53,15 +53,6 @@ namespace Org.OpenAPITools.Test.Model
             //Assert.IsType<Child>(instance);
         }
 
-        /// <summary>
-        /// Test the property 'BoosterSeat'
-        /// </summary>
-        [Fact]
-        public void BoosterSeatTest()
-        {
-            // TODO unit test for the property 'BoosterSeat'
-        }
-
         /// <summary>
         /// Test the property 'Age'
         /// </summary>
@@ -70,5 +61,14 @@ namespace Org.OpenAPITools.Test.Model
         {
             // TODO unit test for the property 'Age'
         }
+
+        /// <summary>
+        /// Test the property 'BoosterSeat'
+        /// </summary>
+        [Fact]
+        public void BoosterSeatTest()
+        {
+            // TODO unit test for the property 'BoosterSeat'
+        }
     }
 }

samples/client/petstore/csharp/generichost/net4.8/AllOf/src/Org.OpenAPITools.Test/Model/PersonTests.cs

@@ -74,12 +74,12 @@ namespace Org.OpenAPITools.Test.Model
         }
 
         /// <summary>
-        /// Test the property 'Type'
+        /// Test the property 'FirstName'
         /// </summary>
         [Fact]
-        public void TypeTest()
+        public void FirstNameTest()
         {
-            // TODO unit test for the property 'Type'
+            // TODO unit test for the property 'FirstName'
         }
 
         /// <summary>
@@ -92,12 +92,12 @@ namespace Org.OpenAPITools.Test.Model
         }
 
         /// <summary>
-        /// Test the property 'FirstName'
+        /// Test the property 'Type'
         /// </summary>
         [Fact]
-        public void FirstNameTest()
+        public void TypeTest()
         {
-            // TODO unit test for the property 'FirstName'
+            // TODO unit test for the property 'Type'
         }
     }
 }

samples/client/petstore/csharp/generichost/net4.8/AllOf/src/Org.OpenAPITools/Model/Adult.cs

@@ -32,11 +32,11 @@ namespace Org.OpenAPITools.Model
         /// <summary>
         /// Initializes a new instance of the <see cref="Adult" /> class.
         /// </summary>
-        /// <param name="lastName">lastName</param>
-        /// <param name="firstName">firstName</param>
         /// <param name="children">children</param>
+        /// <param name="firstName">firstName</param>
+        /// <param name="lastName">lastName</param>
         [JsonConstructor]
-        public Adult(Option<string> lastName = default, Option<string> firstName = default, Option<List<Child>> children = default) : base(lastName, firstName)
+        public Adult(Option<List<Child>> children = default, Option<string> firstName = default, Option<string> lastName = default) : base(firstName, lastName)
         {
             ChildrenOption = children;
             OnCreated();
@@ -44,13 +44,6 @@ namespace Org.OpenAPITools.Model
 
         partial void OnCreated();
 
-        /// <summary>
-        /// The discriminator
-        /// </summary>
-        [JsonIgnore]
-        [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
-        public new string Type { get; } = "Adult";
-
         /// <summary>
         /// Used to track the state of Children
         /// </summary>
@@ -64,6 +57,13 @@ namespace Org.OpenAPITools.Model
         [JsonPropertyName("children")]
         public List<Child> Children { get { return this.ChildrenOption; } set { this.ChildrenOption = new Option<List<Child>>(value); } }
 
+        /// <summary>
+        /// The discriminator
+        /// </summary>
+        [JsonIgnore]
+        [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
+        public new string Type { get; } = "Adult";
+
         /// <summary>
         /// Returns the string presentation of the object
         /// </summary>
@@ -101,10 +101,10 @@ namespace Org.OpenAPITools.Model
 
             JsonTokenType startingTokenType = utf8JsonReader.TokenType;
 
-            Option<string> type = default;
-            Option<string> lastName = default;
-            Option<string> firstName = default;
             Option<List<Child>> children = default;
+            Option<string> firstName = default;
+            Option<string> lastName = default;
+            Option<string> type = default;
 
             while (utf8JsonReader.Read())
             {
@@ -121,18 +121,18 @@ namespace Org.OpenAPITools.Model
 
                     switch (localVarJsonPropertyName)
                     {
-                        case "$_type":
-                            type = new Option<string>(utf8JsonReader.GetString());
-                            break;
-                        case "lastName":
-                            lastName = new Option<string>(utf8JsonReader.GetString());
+                        case "children":
+                            if (utf8JsonReader.TokenType != JsonTokenType.Null)
+                                children = new Option<List<Child>>(JsonSerializer.Deserialize<List<Child>>(ref utf8JsonReader, jsonSerializerOptions));
                             break;
                         case "firstName":
                             firstName = new Option<string>(utf8JsonReader.GetString());
                             break;
-                        case "children":
-                            if (utf8JsonReader.TokenType != JsonTokenType.Null)
-                                children = new Option<List<Child>>(JsonSerializer.Deserialize<List<Child>>(ref utf8JsonReader, jsonSerializerOptions));
+                        case "lastName":
+                            lastName = new Option<string>(utf8JsonReader.GetString());
+                            break;
+                        case "$_type":
+                            type = new Option<string>(utf8JsonReader.GetString());
                             break;
                         default:
                             break;
@@ -140,19 +140,19 @@ namespace Org.OpenAPITools.Model
                 }
             }
 
-            if (type.IsSet && type.Value == null)
-                throw new ArgumentNullException(nameof(type), "Property is not nullable for class Adult.");
-
-            if (lastName.IsSet && lastName.Value == null)
-                throw new ArgumentNullException(nameof(lastName), "Property is not nullable for class Adult.");
+            if (children.IsSet && children.Value == null)
+                throw new ArgumentNullException(nameof(children), "Property is not nullable for class Adult.");
 
             if (firstName.IsSet && firstName.Value == null)
                 throw new ArgumentNullException(nameof(firstName), "Property is not nullable for class Adult.");
 
-            if (children.IsSet && children.Value == null)
-                throw new ArgumentNullException(nameof(children), "Property is not nullable for class Adult.");
+            if (lastName.IsSet && lastName.Value == null)
+                throw new ArgumentNullException(nameof(lastName), "Property is not nullable for class Adult.");
 
-            return new Adult(lastName, firstName, children);
+            if (type.IsSet && type.Value == null)
+                throw new ArgumentNullException(nameof(type), "Property is not nullable for class Adult.");
+
+            return new Adult(children, firstName, lastName);
         }
 
         /// <summary>
@@ -179,28 +179,27 @@ namespace Org.OpenAPITools.Model
         /// <exception cref="NotImplementedException"></exception>
         public void WriteProperties(Utf8JsonWriter writer, Adult adult, JsonSerializerOptions jsonSerializerOptions)
         {
-            if (adult.LastNameOption.IsSet && adult.LastName == null)
-                throw new ArgumentNullException(nameof(adult.LastName), "Property is required for class Adult.");
+            if (adult.ChildrenOption.IsSet && adult.Children == null)
+                throw new ArgumentNullException(nameof(adult.Children), "Property is required for class Adult.");
 
             if (adult.FirstNameOption.IsSet && adult.FirstName == null)
                 throw new ArgumentNullException(nameof(adult.FirstName), "Property is required for class Adult.");
 
-            if (adult.ChildrenOption.IsSet && adult.Children == null)
-                throw new ArgumentNullException(nameof(adult.Children), "Property is required for class Adult.");
-
-            writer.WriteString("$_type", adult.Type);
-
-            if (adult.LastNameOption.IsSet)
-                writer.WriteString("lastName", adult.LastName);
-
-            if (adult.FirstNameOption.IsSet)
-                writer.WriteString("firstName", adult.FirstName);
+            if (adult.LastNameOption.IsSet && adult.LastName == null)
+                throw new ArgumentNullException(nameof(adult.LastName), "Property is required for class Adult.");
 
             if (adult.ChildrenOption.IsSet)
             {
                 writer.WritePropertyName("children");
                 JsonSerializer.Serialize(writer, adult.Children, jsonSerializerOptions);
             }
+            if (adult.FirstNameOption.IsSet)
+                writer.WriteString("firstName", adult.FirstName);
+
+            if (adult.LastNameOption.IsSet)
+                writer.WriteString("lastName", adult.LastName);
+
+            writer.WriteString("$_type", adult.Type);
         }
     }
 }

samples/client/petstore/csharp/generichost/net4.8/AllOf/src/Org.OpenAPITools/Model/Child.cs

@@ -32,12 +32,12 @@ namespace Org.OpenAPITools.Model
         /// <summary>
         /// Initializes a new instance of the <see cref="Child" /> class.
         /// </summary>
-        /// <param name="lastName">lastName</param>
-        /// <param name="firstName">firstName</param>
         /// <param name="age">age</param>
+        /// <param name="firstName">firstName</param>
+        /// <param name="lastName">lastName</param>
         /// <param name="boosterSeat">boosterSeat</param>
         [JsonConstructor]
-        public Child(Option<string> lastName = default, Option<string> firstName = default, Option<int?> age = default, Option<bool?> boosterSeat = default) : base(lastName, firstName)
+        public Child(Option<int?> age = default, Option<string> firstName = default, Option<string> lastName = default, Option<bool?> boosterSeat = default) : base(firstName, lastName)
         {
             AgeOption = age;
             BoosterSeatOption = boosterSeat;
@@ -46,13 +46,6 @@ namespace Org.OpenAPITools.Model
 
         partial void OnCreated();
 
-        /// <summary>
-        /// The discriminator
-        /// </summary>
-        [JsonIgnore]
-        [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
-        public new string Type { get; } = "Child";
-
         /// <summary>
         /// Used to track the state of Age
         /// </summary>
@@ -66,6 +59,13 @@ namespace Org.OpenAPITools.Model
         [JsonPropertyName("age")]
         public int? Age { get { return this.AgeOption; } set { this.AgeOption = new Option<int?>(value); } }
 
+        /// <summary>
+        /// The discriminator
+        /// </summary>
+        [JsonIgnore]
+        [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
+        public new string Type { get; } = "Child";
+
         /// <summary>
         /// Used to track the state of BoosterSeat
         /// </summary>
@@ -88,8 +88,8 @@ namespace Org.OpenAPITools.Model
             StringBuilder sb = new StringBuilder();
             sb.Append("class Child {\n");
             sb.Append("  ").Append(base.ToString()?.Replace("\n", "\n  ")).Append("\n");
-            sb.Append("  BoosterSeat: ").Append(BoosterSeat).Append("\n");
             sb.Append("  Age: ").Append(Age).Append("\n");
+            sb.Append("  BoosterSeat: ").Append(BoosterSeat).Append("\n");
             sb.Append("}\n");
             return sb.ToString();
         }
@@ -117,10 +117,10 @@ namespace Org.OpenAPITools.Model
 
             JsonTokenType startingTokenType = utf8JsonReader.TokenType;
 
-            Option<string> type = default;
-            Option<string> lastName = default;
-            Option<string> firstName = default;
             Option<int?> age = default;
+            Option<string> firstName = default;
+            Option<string> lastName = default;
+            Option<string> type = default;
             Option<bool?> boosterSeat = default;
 
             while (utf8JsonReader.Read())
@@ -138,18 +138,18 @@ namespace Org.OpenAPITools.Model
 
                     switch (localVarJsonPropertyName)
                     {
-                        case "$_type":
-                            type = new Option<string>(utf8JsonReader.GetString());
-                            break;
-                        case "lastName":
-                            lastName = new Option<string>(utf8JsonReader.GetString());
+                        case "age":
+                            if (utf8JsonReader.TokenType != JsonTokenType.Null)
+                                age = new Option<int?>(utf8JsonReader.GetInt32());
                             break;
                         case "firstName":
                             firstName = new Option<string>(utf8JsonReader.GetString());
                             break;
-                        case "age":
-                            if (utf8JsonReader.TokenType != JsonTokenType.Null)
-                                age = new Option<int?>(utf8JsonReader.GetInt32());
+                        case "lastName":
+                            lastName = new Option<string>(utf8JsonReader.GetString());
+                            break;
+                        case "$_type":
+                            type = new Option<string>(utf8JsonReader.GetString());
                             break;
                         case "boosterSeat":
                             if (utf8JsonReader.TokenType != JsonTokenType.Null)
@@ -161,22 +161,22 @@ namespace Org.OpenAPITools.Model
                 }
             }
 
-            if (type.IsSet && type.Value == null)
-                throw new ArgumentNullException(nameof(type), "Property is not nullable for class Child.");
-
-            if (lastName.IsSet && lastName.Value == null)
-                throw new ArgumentNullException(nameof(lastName), "Property is not nullable for class Child.");
+            if (age.IsSet && age.Value == null)
+                throw new ArgumentNullException(nameof(age), "Property is not nullable for class Child.");
 
             if (firstName.IsSet && firstName.Value == null)
                 throw new ArgumentNullException(nameof(firstName), "Property is not nullable for class Child.");
 
-            if (age.IsSet && age.Value == null)
-                throw new ArgumentNullException(nameof(age), "Property is not nullable for class Child.");
+            if (lastName.IsSet && lastName.Value == null)
+                throw new ArgumentNullException(nameof(lastName), "Property is not nullable for class Child.");
+
+            if (type.IsSet && type.Value == null)
+                throw new ArgumentNullException(nameof(type), "Property is not nullable for class Child.");
 
             if (boosterSeat.IsSet && boosterSeat.Value == null)
                 throw new ArgumentNullException(nameof(boosterSeat), "Property is not nullable for class Child.");
 
-            return new Child(lastName, firstName, age, boosterSeat);
+            return new Child(age, firstName, lastName, boosterSeat);
         }
 
         /// <summary>
@@ -203,22 +203,22 @@ namespace Org.OpenAPITools.Model
         /// <exception cref="NotImplementedException"></exception>
         public void WriteProperties(Utf8JsonWriter writer, Child child, JsonSerializerOptions jsonSerializerOptions)
         {
-            if (child.LastNameOption.IsSet && child.LastName == null)
-                throw new ArgumentNullException(nameof(child.LastName), "Property is required for class Child.");
-
             if (child.FirstNameOption.IsSet && child.FirstName == null)
                 throw new ArgumentNullException(nameof(child.FirstName), "Property is required for class Child.");
 
-            writer.WriteString("$_type", child.Type);
+            if (child.LastNameOption.IsSet && child.LastName == null)
+                throw new ArgumentNullException(nameof(child.LastName), "Property is required for class Child.");
 
-            if (child.LastNameOption.IsSet)
-                writer.WriteString("lastName", child.LastName);
+            if (child.AgeOption.IsSet)
+                writer.WriteNumber("age", child.AgeOption.Value.Value);
 
             if (child.FirstNameOption.IsSet)
                 writer.WriteString("firstName", child.FirstName);
 
-            if (child.AgeOption.IsSet)
-                writer.WriteNumber("age", child.AgeOption.Value.Value);
+            if (child.LastNameOption.IsSet)
+                writer.WriteString("lastName", child.LastName);
+
+            writer.WriteString("$_type", child.Type);
 
             if (child.BoosterSeatOption.IsSet)
                 writer.WriteBoolean("boosterSeat", child.BoosterSeatOption.Value.Value);

samples/client/petstore/csharp/generichost/net4.8/AllOf/src/Org.OpenAPITools/Model/Person.cs

@@ -32,38 +32,18 @@ namespace Org.OpenAPITools.Model
         /// <summary>
         /// Initializes a new instance of the <see cref="Person" /> class.
         /// </summary>
-        /// <param name="lastName">lastName</param>
         /// <param name="firstName">firstName</param>
+        /// <param name="lastName">lastName</param>
         [JsonConstructor]
-        public Person(Option<string> lastName = default, Option<string> firstName = default)
+        public Person(Option<string> firstName = default, Option<string> lastName = default)
         {
-            LastNameOption = lastName;
             FirstNameOption = firstName;
+            LastNameOption = lastName;
             OnCreated();
         }
 
         partial void OnCreated();
 
-        /// <summary>
-        /// The discriminator
-        /// </summary>
-        [JsonIgnore]
-        [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
-        public string Type { get; } = "Person";
-
-        /// <summary>
-        /// Used to track the state of LastName
-        /// </summary>
-        [JsonIgnore]
-        [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
-        public Option<string> LastNameOption { get; private set; }
-
-        /// <summary>
-        /// Gets or Sets LastName
-        /// </summary>
-        [JsonPropertyName("lastName")]
-        public string LastName { get { return this.LastNameOption; } set { this.LastNameOption = new Option<string>(value); } }
-
         /// <summary>
         /// Used to track the state of FirstName
         /// </summary>
@@ -77,6 +57,26 @@ namespace Org.OpenAPITools.Model
         [JsonPropertyName("firstName")]
         public string FirstName { get { return this.FirstNameOption; } set { this.FirstNameOption = new Option<string>(value); } }
 
+        /// <summary>
+        /// Used to track the state of LastName
+        /// </summary>
+        [JsonIgnore]
+        [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
+        public Option<string> LastNameOption { get; private set; }
+
+        /// <summary>
+        /// Gets or Sets LastName
+        /// </summary>
+        [JsonPropertyName("lastName")]
+        public string LastName { get { return this.LastNameOption; } set { this.LastNameOption = new Option<string>(value); } }
+
+        /// <summary>
+        /// The discriminator
+        /// </summary>
+        [JsonIgnore]
+        [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
+        public string Type { get; } = "Person";
+
         /// <summary>
         /// Gets or Sets additional properties
         /// </summary>
@@ -91,8 +91,8 @@ namespace Org.OpenAPITools.Model
         {
             StringBuilder sb = new StringBuilder();
             sb.Append("class Person {\n");
-            sb.Append("  LastName: ").Append(LastName).Append("\n");
             sb.Append("  FirstName: ").Append(FirstName).Append("\n");
+            sb.Append("  LastName: ").Append(LastName).Append("\n");
             sb.Append("  AdditionalProperties: ").Append(AdditionalProperties).Append("\n");
             sb.Append("}\n");
             return sb.ToString();
@@ -141,9 +141,9 @@ namespace Org.OpenAPITools.Model
 
             JsonTokenType startingTokenType = utf8JsonReader.TokenType;
 
-            Option<string> type = default;
-            Option<string> lastName = default;
             Option<string> firstName = default;
+            Option<string> lastName = default;
+            Option<string> type = default;
 
             string discriminator = ClientUtils.GetDiscriminator(utf8JsonReader, "$_type");
 
@@ -168,14 +168,14 @@ namespace Org.OpenAPITools.Model
 
                     switch (localVarJsonPropertyName)
                     {
-                        case "$_type":
-                            type = new Option<string>(utf8JsonReader.GetString());
+                        case "firstName":
+                            firstName = new Option<string>(utf8JsonReader.GetString());
                             break;
                         case "lastName":
                             lastName = new Option<string>(utf8JsonReader.GetString());
                             break;
-                        case "firstName":
-                            firstName = new Option<string>(utf8JsonReader.GetString());
+                        case "$_type":
+                            type = new Option<string>(utf8JsonReader.GetString());
                             break;
                         default:
                             break;
@@ -183,16 +183,16 @@ namespace Org.OpenAPITools.Model
                 }
             }
 
-            if (type.IsSet && type.Value == null)
-                throw new ArgumentNullException(nameof(type), "Property is not nullable for class Person.");
+            if (firstName.IsSet && firstName.Value == null)
+                throw new ArgumentNullException(nameof(firstName), "Property is not nullable for class Person.");
 
             if (lastName.IsSet && lastName.Value == null)
                 throw new ArgumentNullException(nameof(lastName), "Property is not nullable for class Person.");
 
-            if (firstName.IsSet && firstName.Value == null)
-                throw new ArgumentNullException(nameof(firstName), "Property is not nullable for class Person.");
+            if (type.IsSet && type.Value == null)
+                throw new ArgumentNullException(nameof(type), "Property is not nullable for class Person.");
 
-            return new Person(lastName, firstName);
+            return new Person(firstName, lastName);
         }
 
         /// <summary>
@@ -229,19 +229,19 @@ namespace Org.OpenAPITools.Model
         /// <exception cref="NotImplementedException"></exception>
         public void WriteProperties(Utf8JsonWriter writer, Person person, JsonSerializerOptions jsonSerializerOptions)
         {
-            if (person.LastNameOption.IsSet && person.LastName == null)
-                throw new ArgumentNullException(nameof(person.LastName), "Property is required for class Person.");
-
             if (person.FirstNameOption.IsSet && person.FirstName == null)
                 throw new ArgumentNullException(nameof(person.FirstName), "Property is required for class Person.");
 
-            writer.WriteString("$_type", person.Type);
+            if (person.LastNameOption.IsSet && person.LastName == null)
+                throw new ArgumentNullException(nameof(person.LastName), "Property is required for class Person.");
+
+            if (person.FirstNameOption.IsSet)
+                writer.WriteString("firstName", person.FirstName);
 
             if (person.LastNameOption.IsSet)
                 writer.WriteString("lastName", person.LastName);
 
-            if (person.FirstNameOption.IsSet)
-                writer.WriteString("firstName", person.FirstName);
+            writer.WriteString("$_type", person.Type);
         }
     }
 }

samples/client/petstore/csharp/generichost/net4.8/FormModels/docs/apis/FakeApi.md

@@ -1067,7 +1067,7 @@ No authorization required
 
 <a id="testendpointparameters"></a>
 # **TestEndpointParameters**
-> void TestEndpointParameters (decimal number, double varDouble, string patternWithoutDelimiter, byte[] varByte, int integer = null, int int32 = null, long int64 = null, float varFloat = null, string varString = null, System.IO.Stream binary = null, DateTime date = null, DateTime dateTime = null, string password = null, string callback = null)
+> void TestEndpointParameters (decimal number, string patternWithoutDelimiter, byte[] varByte, double varDouble, System.IO.Stream binary = null, string callback = null, DateTime date = null, DateTime dateTime = null, int int32 = null, long int64 = null, int integer = null, string password = null, float varFloat = null, string varString = null)
 
 Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
 
@@ -1095,24 +1095,24 @@ namespace Example
 
             var apiInstance = new FakeApi(config);
             var number = 8.14D;  // decimal | None
-            var varDouble = 1.2D;  // double | None
             var patternWithoutDelimiter = "patternWithoutDelimiter_example";  // string | None
             var varByte = System.Text.Encoding.ASCII.GetBytes("BYTE_ARRAY_DATA_HERE");  // byte[] | None
-            var integer = 56;  // int | None (optional) 
-            var int32 = 56;  // int | None (optional) 
-            var int64 = 789L;  // long | None (optional) 
-            var varFloat = 3.4F;  // float | None (optional) 
-            var varString = "varString_example";  // string | None (optional) 
+            var varDouble = 1.2D;  // double | None
             var binary = new System.IO.MemoryStream(System.IO.File.ReadAllBytes("/path/to/file.txt"));  // System.IO.Stream | None (optional) 
+            var callback = "callback_example";  // string | None (optional) 
             var date = DateTime.Parse("2013-10-20");  // DateTime | None (optional) 
             var dateTime = DateTime.Parse(""2010-02-01T10:20:10.111110+01:00"");  // DateTime | None (optional)  (default to "2010-02-01T10:20:10.111110+01:00")
+            var int32 = 56;  // int | None (optional) 
+            var int64 = 789L;  // long | None (optional) 
+            var integer = 56;  // int | None (optional) 
             var password = "password_example";  // string | None (optional) 
-            var callback = "callback_example";  // string | None (optional) 
+            var varFloat = 3.4F;  // float | None (optional) 
+            var varString = "varString_example";  // string | None (optional) 
 
             try
             {
                 // Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
-                apiInstance.TestEndpointParameters(number, varDouble, patternWithoutDelimiter, varByte, integer, int32, int64, varFloat, varString, binary, date, dateTime, password, callback);
+                apiInstance.TestEndpointParameters(number, patternWithoutDelimiter, varByte, varDouble, binary, callback, date, dateTime, int32, int64, integer, password, varFloat, varString);
             }
             catch (ApiException  e)
             {
@@ -1132,7 +1132,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
-    apiInstance.TestEndpointParametersWithHttpInfo(number, varDouble, patternWithoutDelimiter, varByte, integer, int32, int64, varFloat, varString, binary, date, dateTime, password, callback);
+    apiInstance.TestEndpointParametersWithHttpInfo(number, patternWithoutDelimiter, varByte, varDouble, binary, callback, date, dateTime, int32, int64, integer, password, varFloat, varString);
 }
 catch (ApiException e)
 {
@@ -1147,19 +1147,19 @@ catch (ApiException e)
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
 | **number** | **decimal** | None |  |
-| **varDouble** | **double** | None |  |
 | **patternWithoutDelimiter** | **string** | None |  |
 | **varByte** | **byte[]** | None |  |
-| **integer** | **int** | None | [optional]  |
-| **int32** | **int** | None | [optional]  |
-| **int64** | **long** | None | [optional]  |
-| **varFloat** | **float** | None | [optional]  |
-| **varString** | **string** | None | [optional]  |
+| **varDouble** | **double** | None |  |
 | **binary** | **System.IO.Stream****System.IO.Stream** | None | [optional]  |
+| **callback** | **string** | None | [optional]  |
 | **date** | **DateTime** | None | [optional]  |
 | **dateTime** | **DateTime** | None | [optional] [default to &quot;2010-02-01T10:20:10.111110+01:00&quot;] |
+| **int32** | **int** | None | [optional]  |
+| **int64** | **long** | None | [optional]  |
+| **integer** | **int** | None | [optional]  |
 | **password** | **string** | None | [optional]  |
-| **callback** | **string** | None | [optional]  |
+| **varFloat** | **float** | None | [optional]  |
+| **varString** | **string** | None | [optional]  |
 
 ### Return type
 
@@ -1185,7 +1185,7 @@ void (empty response body)
 
 <a id="testenumparameters"></a>
 # **TestEnumParameters**
-> void TestEnumParameters (List<TestEnumParametersRequestEnumFormStringArrayInner> enumHeaderStringArray = null, TestEnumParametersEnumHeaderStringParameter enumHeaderString = null, List<TestEnumParametersRequestEnumFormStringArrayInner> enumQueryStringArray = null, TestEnumParametersEnumHeaderStringParameter enumQueryString = null, TestEnumParametersEnumQueryIntegerParameter enumQueryInteger = null, TestEnumParametersEnumQueryDoubleParameter enumQueryDouble = null, List<TestEnumParametersRequestEnumFormStringArrayInner> enumFormStringArray = null, TestEnumParametersRequestEnumFormString enumFormString = null)
+> void TestEnumParameters (TestEnumParametersRequestEnumFormString enumFormString = null, List<TestEnumParametersRequestEnumFormStringArrayInner> enumFormStringArray = null, TestEnumParametersEnumHeaderStringParameter enumHeaderString = null, List<TestEnumParametersRequestEnumFormStringArrayInner> enumHeaderStringArray = null, TestEnumParametersEnumQueryDoubleParameter enumQueryDouble = null, TestEnumParametersEnumQueryIntegerParameter enumQueryInteger = null, TestEnumParametersEnumHeaderStringParameter enumQueryString = null, List<TestEnumParametersRequestEnumFormStringArrayInner> enumQueryStringArray = null)
 
 To test enum parameters
 
@@ -1208,19 +1208,19 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new FakeApi(config);
-            var enumHeaderStringArray = new List<TestEnumParametersRequestEnumFormStringArrayInner>(); // List<TestEnumParametersRequestEnumFormStringArrayInner> | Header parameter enum test (string array) (optional) 
-            var enumHeaderString = (TestEnumParametersEnumHeaderStringParameter) "_abc";  // TestEnumParametersEnumHeaderStringParameter | Header parameter enum test (string) (optional) 
-            var enumQueryStringArray = new List<TestEnumParametersRequestEnumFormStringArrayInner>(); // List<TestEnumParametersRequestEnumFormStringArrayInner> | Query parameter enum test (string array) (optional) 
-            var enumQueryString = (TestEnumParametersEnumHeaderStringParameter) "_abc";  // TestEnumParametersEnumHeaderStringParameter | Query parameter enum test (string) (optional) 
-            var enumQueryInteger = (TestEnumParametersEnumQueryIntegerParameter) "1";  // TestEnumParametersEnumQueryIntegerParameter | Query parameter enum test (double) (optional) 
-            var enumQueryDouble = (TestEnumParametersEnumQueryDoubleParameter) "1.1";  // TestEnumParametersEnumQueryDoubleParameter | Query parameter enum test (double) (optional) 
-            var enumFormStringArray = new List<TestEnumParametersRequestEnumFormStringArrayInner>(); // List<TestEnumParametersRequestEnumFormStringArrayInner> | Form parameter enum test (string array) (optional) 
             var enumFormString = (TestEnumParametersRequestEnumFormString) "_abc";  // TestEnumParametersRequestEnumFormString |  (optional) 
+            var enumFormStringArray = new List<TestEnumParametersRequestEnumFormStringArrayInner>(); // List<TestEnumParametersRequestEnumFormStringArrayInner> | Form parameter enum test (string array) (optional) 
+            var enumHeaderString = (TestEnumParametersEnumHeaderStringParameter) "_abc";  // TestEnumParametersEnumHeaderStringParameter | Header parameter enum test (string) (optional) 
+            var enumHeaderStringArray = new List<TestEnumParametersRequestEnumFormStringArrayInner>(); // List<TestEnumParametersRequestEnumFormStringArrayInner> | Header parameter enum test (string array) (optional) 
+            var enumQueryDouble = (TestEnumParametersEnumQueryDoubleParameter) "1.1";  // TestEnumParametersEnumQueryDoubleParameter | Query parameter enum test (double) (optional) 
+            var enumQueryInteger = (TestEnumParametersEnumQueryIntegerParameter) "1";  // TestEnumParametersEnumQueryIntegerParameter | Query parameter enum test (double) (optional) 
+            var enumQueryString = (TestEnumParametersEnumHeaderStringParameter) "_abc";  // TestEnumParametersEnumHeaderStringParameter | Query parameter enum test (string) (optional) 
+            var enumQueryStringArray = new List<TestEnumParametersRequestEnumFormStringArrayInner>(); // List<TestEnumParametersRequestEnumFormStringArrayInner> | Query parameter enum test (string array) (optional) 
 
             try
             {
                 // To test enum parameters
-                apiInstance.TestEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
+                apiInstance.TestEnumParameters(enumFormString, enumFormStringArray, enumHeaderString, enumHeaderStringArray, enumQueryDouble, enumQueryInteger, enumQueryString, enumQueryStringArray);
             }
             catch (ApiException  e)
             {
@@ -1240,7 +1240,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // To test enum parameters
-    apiInstance.TestEnumParametersWithHttpInfo(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
+    apiInstance.TestEnumParametersWithHttpInfo(enumFormString, enumFormStringArray, enumHeaderString, enumHeaderStringArray, enumQueryDouble, enumQueryInteger, enumQueryString, enumQueryStringArray);
 }
 catch (ApiException e)
 {
@@ -1254,14 +1254,14 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **enumHeaderStringArray** | [**List&lt;TestEnumParametersRequestEnumFormStringArrayInner&gt;**](TestEnumParametersRequestEnumFormStringArrayInner.md) | Header parameter enum test (string array) | [optional]  |
-| **enumHeaderString** | **TestEnumParametersEnumHeaderStringParameter** | Header parameter enum test (string) | [optional]  |
-| **enumQueryStringArray** | [**List&lt;TestEnumParametersRequestEnumFormStringArrayInner&gt;**](TestEnumParametersRequestEnumFormStringArrayInner.md) | Query parameter enum test (string array) | [optional]  |
-| **enumQueryString** | **TestEnumParametersEnumHeaderStringParameter** | Query parameter enum test (string) | [optional]  |
-| **enumQueryInteger** | **TestEnumParametersEnumQueryIntegerParameter** | Query parameter enum test (double) | [optional]  |
-| **enumQueryDouble** | **TestEnumParametersEnumQueryDoubleParameter** | Query parameter enum test (double) | [optional]  |
-| **enumFormStringArray** | [**List&lt;TestEnumParametersRequestEnumFormStringArrayInner&gt;**](TestEnumParametersRequestEnumFormStringArrayInner.md) | Form parameter enum test (string array) | [optional]  |
 | **enumFormString** | **TestEnumParametersRequestEnumFormString** |  | [optional]  |
+| **enumFormStringArray** | [**List&lt;TestEnumParametersRequestEnumFormStringArrayInner&gt;**](TestEnumParametersRequestEnumFormStringArrayInner.md) | Form parameter enum test (string array) | [optional]  |
+| **enumHeaderString** | **TestEnumParametersEnumHeaderStringParameter** | Header parameter enum test (string) | [optional]  |
+| **enumHeaderStringArray** | [**List&lt;TestEnumParametersRequestEnumFormStringArrayInner&gt;**](TestEnumParametersRequestEnumFormStringArrayInner.md) | Header parameter enum test (string array) | [optional]  |
+| **enumQueryDouble** | **TestEnumParametersEnumQueryDoubleParameter** | Query parameter enum test (double) | [optional]  |
+| **enumQueryInteger** | **TestEnumParametersEnumQueryIntegerParameter** | Query parameter enum test (double) | [optional]  |
+| **enumQueryString** | **TestEnumParametersEnumHeaderStringParameter** | Query parameter enum test (string) | [optional]  |
+| **enumQueryStringArray** | [**List&lt;TestEnumParametersRequestEnumFormStringArrayInner&gt;**](TestEnumParametersRequestEnumFormStringArrayInner.md) | Query parameter enum test (string array) | [optional]  |
 
 ### Return type
 
@@ -1287,7 +1287,7 @@ No authorization required
 
 <a id="testgroupparameters"></a>
 # **TestGroupParameters**
-> void TestGroupParameters (int requiredStringGroup, bool requiredBooleanGroup, long requiredInt64Group, int stringGroup = null, bool booleanGroup = null, long int64Group = null)
+> void TestGroupParameters (bool requiredBooleanGroup, long requiredInt64Group, int requiredStringGroup, bool booleanGroup = null, long int64Group = null, int stringGroup = null)
 
 Fake endpoint to test group parameters (optional)
 
@@ -1313,17 +1313,17 @@ namespace Example
             config.AccessToken = "YOUR_BEARER_TOKEN";
 
             var apiInstance = new FakeApi(config);
-            var requiredStringGroup = 56;  // int | Required String in group parameters
             var requiredBooleanGroup = true;  // bool | Required Boolean in group parameters
             var requiredInt64Group = 789L;  // long | Required Integer in group parameters
-            var stringGroup = 56;  // int | String in group parameters (optional) 
+            var requiredStringGroup = 56;  // int | Required String in group parameters
             var booleanGroup = true;  // bool | Boolean in group parameters (optional) 
             var int64Group = 789L;  // long | Integer in group parameters (optional) 
+            var stringGroup = 56;  // int | String in group parameters (optional) 
 
             try
             {
                 // Fake endpoint to test group parameters (optional)
-                apiInstance.TestGroupParameters(requiredStringGroup, requiredBooleanGroup, requiredInt64Group, stringGroup, booleanGroup, int64Group);
+                apiInstance.TestGroupParameters(requiredBooleanGroup, requiredInt64Group, requiredStringGroup, booleanGroup, int64Group, stringGroup);
             }
             catch (ApiException  e)
             {
@@ -1343,7 +1343,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Fake endpoint to test group parameters (optional)
-    apiInstance.TestGroupParametersWithHttpInfo(requiredStringGroup, requiredBooleanGroup, requiredInt64Group, stringGroup, booleanGroup, int64Group);
+    apiInstance.TestGroupParametersWithHttpInfo(requiredBooleanGroup, requiredInt64Group, requiredStringGroup, booleanGroup, int64Group, stringGroup);
 }
 catch (ApiException e)
 {
@@ -1357,12 +1357,12 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **requiredStringGroup** | **int** | Required String in group parameters |  |
 | **requiredBooleanGroup** | **bool** | Required Boolean in group parameters |  |
 | **requiredInt64Group** | **long** | Required Integer in group parameters |  |
-| **stringGroup** | **int** | String in group parameters | [optional]  |
+| **requiredStringGroup** | **int** | Required String in group parameters |  |
 | **booleanGroup** | **bool** | Boolean in group parameters | [optional]  |
 | **int64Group** | **long** | Integer in group parameters | [optional]  |
+| **stringGroup** | **int** | String in group parameters | [optional]  |
 
 ### Return type
 
@@ -1644,7 +1644,7 @@ No authorization required
 
 <a id="testqueryparametercollectionformat"></a>
 # **TestQueryParameterCollectionFormat**
-> void TestQueryParameterCollectionFormat (List<string> pipe, List<string> ioutil, List<string> http, List<string> url, List<string> context, string requiredNotNullable, string requiredNullable, string notRequiredNotNullable = null, string notRequiredNullable = null)
+> void TestQueryParameterCollectionFormat (List<string> context, List<string> http, List<string> ioutil, List<string> pipe, string requiredNotNullable, List<string> url, string notRequiredNotNullable = null, string notRequiredNullable = null, string requiredNullable)
 
 
 
@@ -1667,19 +1667,19 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new FakeApi(config);
-            var pipe = new List<string>(); // List<string> | 
-            var ioutil = new List<string>(); // List<string> | 
-            var http = new List<string>(); // List<string> | 
-            var url = new List<string>(); // List<string> | 
             var context = new List<string>(); // List<string> | 
+            var http = new List<string>(); // List<string> | 
+            var ioutil = new List<string>(); // List<string> | 
+            var pipe = new List<string>(); // List<string> | 
             var requiredNotNullable = "requiredNotNullable_example";  // string | 
-            var requiredNullable = "requiredNullable_example";  // string | 
+            var url = new List<string>(); // List<string> | 
             var notRequiredNotNullable = "notRequiredNotNullable_example";  // string |  (optional) 
             var notRequiredNullable = "notRequiredNullable_example";  // string |  (optional) 
+            var requiredNullable = "requiredNullable_example";  // string | 
 
             try
             {
-                apiInstance.TestQueryParameterCollectionFormat(pipe, ioutil, http, url, context, requiredNotNullable, requiredNullable, notRequiredNotNullable, notRequiredNullable);
+                apiInstance.TestQueryParameterCollectionFormat(context, http, ioutil, pipe, requiredNotNullable, url, notRequiredNotNullable, notRequiredNullable, requiredNullable);
             }
             catch (ApiException  e)
             {
@@ -1698,7 +1698,7 @@ This returns an ApiResponse object which contains the response data, status code
 ```csharp
 try
 {
-    apiInstance.TestQueryParameterCollectionFormatWithHttpInfo(pipe, ioutil, http, url, context, requiredNotNullable, requiredNullable, notRequiredNotNullable, notRequiredNullable);
+    apiInstance.TestQueryParameterCollectionFormatWithHttpInfo(context, http, ioutil, pipe, requiredNotNullable, url, notRequiredNotNullable, notRequiredNullable, requiredNullable);
 }
 catch (ApiException e)
 {
@@ -1712,15 +1712,15 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **pipe** | [**List&lt;string&gt;**](string.md) |  |  |
-| **ioutil** | [**List&lt;string&gt;**](string.md) |  |  |
-| **http** | [**List&lt;string&gt;**](string.md) |  |  |
-| **url** | [**List&lt;string&gt;**](string.md) |  |  |
 | **context** | [**List&lt;string&gt;**](string.md) |  |  |
+| **http** | [**List&lt;string&gt;**](string.md) |  |  |
+| **ioutil** | [**List&lt;string&gt;**](string.md) |  |  |
+| **pipe** | [**List&lt;string&gt;**](string.md) |  |  |
 | **requiredNotNullable** | **string** |  |  |
-| **requiredNullable** | **string** |  |  |
+| **url** | [**List&lt;string&gt;**](string.md) |  |  |
 | **notRequiredNotNullable** | **string** |  | [optional]  |
 | **notRequiredNullable** | **string** |  | [optional]  |
+| **requiredNullable** | **string** |  |  |
 
 ### Return type
 

samples/client/petstore/csharp/generichost/net4.8/FormModels/docs/apis/UserApi.md

@@ -453,7 +453,7 @@ No authorization required
 
 <a id="loginuser"></a>
 # **LoginUser**
-> string LoginUser (string username, string password)
+> string LoginUser (string password, string username)
 
 Logs user into the system
 
@@ -474,13 +474,13 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new UserApi(config);
-            var username = "username_example";  // string | The user name for login
             var password = "password_example";  // string | The password for login in clear text
+            var username = "username_example";  // string | The user name for login
 
             try
             {
                 // Logs user into the system
-                string result = apiInstance.LoginUser(username, password);
+                string result = apiInstance.LoginUser(password, username);
                 Debug.WriteLine(result);
             }
             catch (ApiException  e)
@@ -501,7 +501,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Logs user into the system
-    ApiResponse<string> response = apiInstance.LoginUserWithHttpInfo(username, password);
+    ApiResponse<string> response = apiInstance.LoginUserWithHttpInfo(password, username);
     Debug.Write("Status Code: " + response.StatusCode);
     Debug.Write("Response Headers: " + response.Headers);
     Debug.Write("Response Body: " + response.Data);
@@ -518,8 +518,8 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **username** | **string** | The user name for login |  |
 | **password** | **string** | The password for login in clear text |  |
+| **username** | **string** | The user name for login |  |
 
 ### Return type
 
@@ -625,7 +625,7 @@ No authorization required
 
 <a id="updateuser"></a>
 # **UpdateUser**
-> void UpdateUser (string username, User user)
+> void UpdateUser (User user, string username)
 
 Updated user
 
@@ -648,13 +648,13 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new UserApi(config);
-            var username = "username_example";  // string | name that need to be deleted
             var user = new User(); // User | Updated user object
+            var username = "username_example";  // string | name that need to be deleted
 
             try
             {
                 // Updated user
-                apiInstance.UpdateUser(username, user);
+                apiInstance.UpdateUser(user, username);
             }
             catch (ApiException  e)
             {
@@ -674,7 +674,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Updated user
-    apiInstance.UpdateUserWithHttpInfo(username, user);
+    apiInstance.UpdateUserWithHttpInfo(user, username);
 }
 catch (ApiException e)
 {
@@ -688,8 +688,8 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **username** | **string** | name that need to be deleted |  |
 | **user** | [**User**](User.md) | Updated user object |  |
+| **username** | **string** | name that need to be deleted |  |
 
 ### Return type
 

samples/client/petstore/csharp/generichost/net4.8/FormModels/src/Org.OpenAPITools.Test/Api/FakeApiTests.cs

@@ -193,20 +193,20 @@ namespace Org.OpenAPITools.Test.Api
         public async Task TestEndpointParametersAsyncTest()
         {
             decimal number = default;
-            double varDouble = default;
             string patternWithoutDelimiter = default;
             byte[] varByte = default;
-            Client.Option<int> integer = default;
-            Client.Option<int> int32 = default;
-            Client.Option<long> int64 = default;
-            Client.Option<float> varFloat = default;
-            Client.Option<string> varString = default;
+            double varDouble = default;
             Client.Option<System.IO.Stream> binary = default;
+            Client.Option<string> callback = default;
             Client.Option<DateTime> date = default;
             Client.Option<DateTime> dateTime = default;
+            Client.Option<int> int32 = default;
+            Client.Option<long> int64 = default;
+            Client.Option<int> integer = default;
             Client.Option<string> password = default;
-            Client.Option<string> callback = default;
-            await _instance.TestEndpointParametersAsync(number, varDouble, patternWithoutDelimiter, varByte, integer, int32, int64, varFloat, varString, binary, date, dateTime, password, callback);
+            Client.Option<float> varFloat = default;
+            Client.Option<string> varString = default;
+            await _instance.TestEndpointParametersAsync(number, patternWithoutDelimiter, varByte, varDouble, binary, callback, date, dateTime, int32, int64, integer, password, varFloat, varString);
         }
 
         /// <summary>
@@ -215,15 +215,15 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task TestEnumParametersAsyncTest()
         {
-            Client.Option<List<TestEnumParametersRequestEnumFormStringArrayInner>> enumHeaderStringArray = default;
-            Client.Option<TestEnumParametersEnumHeaderStringParameter> enumHeaderString = default;
-            Client.Option<List<TestEnumParametersRequestEnumFormStringArrayInner>> enumQueryStringArray = default;
-            Client.Option<TestEnumParametersEnumHeaderStringParameter> enumQueryString = default;
-            Client.Option<TestEnumParametersEnumQueryIntegerParameter> enumQueryInteger = default;
-            Client.Option<TestEnumParametersEnumQueryDoubleParameter> enumQueryDouble = default;
-            Client.Option<List<TestEnumParametersRequestEnumFormStringArrayInner>> enumFormStringArray = default;
             Client.Option<TestEnumParametersRequestEnumFormString> enumFormString = default;
-            await _instance.TestEnumParametersAsync(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
+            Client.Option<List<TestEnumParametersRequestEnumFormStringArrayInner>> enumFormStringArray = default;
+            Client.Option<TestEnumParametersEnumHeaderStringParameter> enumHeaderString = default;
+            Client.Option<List<TestEnumParametersRequestEnumFormStringArrayInner>> enumHeaderStringArray = default;
+            Client.Option<TestEnumParametersEnumQueryDoubleParameter> enumQueryDouble = default;
+            Client.Option<TestEnumParametersEnumQueryIntegerParameter> enumQueryInteger = default;
+            Client.Option<TestEnumParametersEnumHeaderStringParameter> enumQueryString = default;
+            Client.Option<List<TestEnumParametersRequestEnumFormStringArrayInner>> enumQueryStringArray = default;
+            await _instance.TestEnumParametersAsync(enumFormString, enumFormStringArray, enumHeaderString, enumHeaderStringArray, enumQueryDouble, enumQueryInteger, enumQueryString, enumQueryStringArray);
         }
 
         /// <summary>
@@ -232,13 +232,13 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task TestGroupParametersAsyncTest()
         {
-            int requiredStringGroup = default;
             bool requiredBooleanGroup = default;
             long requiredInt64Group = default;
-            Client.Option<int> stringGroup = default;
+            int requiredStringGroup = default;
             Client.Option<bool> booleanGroup = default;
             Client.Option<long> int64Group = default;
-            await _instance.TestGroupParametersAsync(requiredStringGroup, requiredBooleanGroup, requiredInt64Group, stringGroup, booleanGroup, int64Group);
+            Client.Option<int> stringGroup = default;
+            await _instance.TestGroupParametersAsync(requiredBooleanGroup, requiredInt64Group, requiredStringGroup, booleanGroup, int64Group, stringGroup);
         }
 
         /// <summary>
@@ -278,16 +278,16 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task TestQueryParameterCollectionFormatAsyncTest()
         {
-            List<string> pipe = default;
-            List<string> ioutil = default;
-            List<string> http = default;
-            List<string> url = default;
             List<string> context = default;
+            List<string> http = default;
+            List<string> ioutil = default;
+            List<string> pipe = default;
             string requiredNotNullable = default;
-            string requiredNullable = default;
+            List<string> url = default;
             Client.Option<string> notRequiredNotNullable = default;
             Client.Option<string> notRequiredNullable = default;
-            await _instance.TestQueryParameterCollectionFormatAsync(pipe, ioutil, http, url, context, requiredNotNullable, requiredNullable, notRequiredNotNullable, notRequiredNullable);
+            string requiredNullable = default;
+            await _instance.TestQueryParameterCollectionFormatAsync(context, http, ioutil, pipe, requiredNotNullable, url, notRequiredNotNullable, notRequiredNullable, requiredNullable);
         }
 
         /// <summary>

samples/client/petstore/csharp/generichost/net4.8/FormModels/src/Org.OpenAPITools.Test/Api/UserApiTests.cs

@@ -108,9 +108,9 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task LoginUserAsyncTest()
         {
-            string username = default;
             string password = default;
-            var response = await _instance.LoginUserAsync(username, password);
+            string username = default;
+            var response = await _instance.LoginUserAsync(password, username);
             var model = response.Ok();
             Assert.IsType<string>(model);
         }
@@ -130,9 +130,9 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task UpdateUserAsyncTest()
         {
-            string username = default;
             User user = default;
-            await _instance.UpdateUserAsync(username, user);
+            string username = default;
+            await _instance.UpdateUserAsync(user, username);
         }
     }
 }

samples/client/petstore/csharp/generichost/net4.8/FormModels/src/Org.OpenAPITools/Api/UserApi.cs

@@ -155,11 +155,11 @@ namespace Org.OpenAPITools.Api
         /// 
         /// </remarks>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        Task<ILoginUserApiResponse> LoginUserAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default);
+        Task<ILoginUserApiResponse> LoginUserAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Logs user into the system
@@ -167,11 +167,11 @@ namespace Org.OpenAPITools.Api
         /// <remarks>
         /// 
         /// </remarks>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        Task<ILoginUserApiResponse> LoginUserOrDefaultAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default);
+        Task<ILoginUserApiResponse> LoginUserOrDefaultAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Logs out current logged in user session
@@ -201,11 +201,11 @@ namespace Org.OpenAPITools.Api
         /// This can only be done by the logged in user.
         /// </remarks>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        Task<IUpdateUserApiResponse> UpdateUserAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default);
+        Task<IUpdateUserApiResponse> UpdateUserAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Updated user
@@ -213,11 +213,11 @@ namespace Org.OpenAPITools.Api
         /// <remarks>
         /// This can only be done by the logged in user.
         /// </remarks>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        Task<IUpdateUserApiResponse> UpdateUserOrDefaultAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default);
+        Task<IUpdateUserApiResponse> UpdateUserOrDefaultAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default);
     }
 
     /// <summary>
@@ -1622,33 +1622,33 @@ namespace Org.OpenAPITools.Api
             partial void OnDeserializationError(ref bool suppressDefaultLog, Exception exception, HttpStatusCode httpStatusCode);
         }
 
-        partial void FormatLoginUser(ref string username, ref string password);
+        partial void FormatLoginUser(ref string password, ref string username);
 
         /// <summary>
         /// Validates the request parameters
         /// </summary>
-        /// <param name="username"></param>
         /// <param name="password"></param>
+        /// <param name="username"></param>
         /// <returns></returns>
-        private void ValidateLoginUser(string username, string password)
+        private void ValidateLoginUser(string password, string username)
         {
-            if (username == null)
-                throw new ArgumentNullException(nameof(username));
-
             if (password == null)
                 throw new ArgumentNullException(nameof(password));
+
+            if (username == null)
+                throw new ArgumentNullException(nameof(username));
         }
 
         /// <summary>
         /// Processes the server response
         /// </summary>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        private void AfterLoginUserDefaultImplementation(ILoginUserApiResponse apiResponseLocalVar, string username, string password)
+        /// <param name="username"></param>
+        private void AfterLoginUserDefaultImplementation(ILoginUserApiResponse apiResponseLocalVar, string password, string username)
         {
             bool suppressDefaultLog = false;
-            AfterLoginUser(ref suppressDefaultLog, apiResponseLocalVar, username, password);
+            AfterLoginUser(ref suppressDefaultLog, apiResponseLocalVar, password, username);
             if (!suppressDefaultLog)
                 Logger.LogInformation("{0,-9} | {1} | {3}", (apiResponseLocalVar.DownloadedAt - apiResponseLocalVar.RequestedAt).TotalSeconds, apiResponseLocalVar.StatusCode, apiResponseLocalVar.Path);
         }
@@ -1658,9 +1658,9 @@ namespace Org.OpenAPITools.Api
         /// </summary>
         /// <param name="suppressDefaultLog"></param>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        partial void AfterLoginUser(ref bool suppressDefaultLog, ILoginUserApiResponse apiResponseLocalVar, string username, string password);
+        /// <param name="username"></param>
+        partial void AfterLoginUser(ref bool suppressDefaultLog, ILoginUserApiResponse apiResponseLocalVar, string password, string username);
 
         /// <summary>
         /// Logs exceptions that occur while retrieving the server response
@@ -1668,12 +1668,12 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        private void OnErrorLoginUserDefaultImplementation(Exception exception, string pathFormat, string path, string username, string password)
+        /// <param name="username"></param>
+        private void OnErrorLoginUserDefaultImplementation(Exception exception, string pathFormat, string path, string password, string username)
         {
             bool suppressDefaultLog = false;
-            OnErrorLoginUser(ref suppressDefaultLog, exception, pathFormat, path, username, password);
+            OnErrorLoginUser(ref suppressDefaultLog, exception, pathFormat, path, password, username);
             if (!suppressDefaultLog)
                 Logger.LogError(exception, "An error occurred while sending the request to the server.");
         }
@@ -1685,22 +1685,22 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        partial void OnErrorLoginUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, string username, string password);
+        /// <param name="username"></param>
+        partial void OnErrorLoginUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, string password, string username);
 
         /// <summary>
         /// Logs user into the system 
         /// </summary>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        public async Task<ILoginUserApiResponse> LoginUserOrDefaultAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<ILoginUserApiResponse> LoginUserOrDefaultAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             try
             {
-                return await LoginUserAsync(username, password, cancellationToken).ConfigureAwait(false);
+                return await LoginUserAsync(password, username, cancellationToken).ConfigureAwait(false);
             }
             catch (Exception)
             {
@@ -1712,19 +1712,19 @@ namespace Org.OpenAPITools.Api
         /// Logs user into the system 
         /// </summary>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        public async Task<ILoginUserApiResponse> LoginUserAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<ILoginUserApiResponse> LoginUserAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             UriBuilder uriBuilderLocalVar = new UriBuilder();
 
             try
             {
-                ValidateLoginUser(username, password);
+                ValidateLoginUser(password, username);
 
-                FormatLoginUser(ref username, ref password);
+                FormatLoginUser(ref password, ref username);
 
                 using (HttpRequestMessage httpRequestMessageLocalVar = new HttpRequestMessage())
                 {
@@ -1735,8 +1735,8 @@ namespace Org.OpenAPITools.Api
 
                     System.Collections.Specialized.NameValueCollection parseQueryStringLocalVar = System.Web.HttpUtility.ParseQueryString(string.Empty);
 
-                    parseQueryStringLocalVar["username"] = ClientUtils.ParameterToString(username);
                     parseQueryStringLocalVar["password"] = ClientUtils.ParameterToString(password);
+                    parseQueryStringLocalVar["username"] = ClientUtils.ParameterToString(username);
 
                     uriBuilderLocalVar.Query = parseQueryStringLocalVar.ToString();
 
@@ -1763,7 +1763,7 @@ namespace Org.OpenAPITools.Api
 
                         LoginUserApiResponse apiResponseLocalVar = new LoginUserApiResponse(apiResponseLoggerLocalVar, httpRequestMessageLocalVar, httpResponseMessageLocalVar, responseContentLocalVar, "/user/login", requestedAtLocalVar, _jsonSerializerOptions);
 
-                        AfterLoginUserDefaultImplementation(apiResponseLocalVar, username, password);
+                        AfterLoginUserDefaultImplementation(apiResponseLocalVar, password, username);
 
                         Events.ExecuteOnLoginUser(apiResponseLocalVar);
 
@@ -1773,7 +1773,7 @@ namespace Org.OpenAPITools.Api
             }
             catch(Exception e)
             {
-                OnErrorLoginUserDefaultImplementation(e, "/user/login", uriBuilderLocalVar.Path, username, password);
+                OnErrorLoginUserDefaultImplementation(e, "/user/login", uriBuilderLocalVar.Path, password, username);
                 Events.ExecuteOnErrorLoginUser(e);
                 throw;
             }
@@ -2014,33 +2014,33 @@ namespace Org.OpenAPITools.Api
             partial void OnDeserializationError(ref bool suppressDefaultLog, Exception exception, HttpStatusCode httpStatusCode);
         }
 
-        partial void FormatUpdateUser(ref string username, User user);
+        partial void FormatUpdateUser(User user, ref string username);
 
         /// <summary>
         /// Validates the request parameters
         /// </summary>
-        /// <param name="username"></param>
         /// <param name="user"></param>
+        /// <param name="username"></param>
         /// <returns></returns>
-        private void ValidateUpdateUser(string username, User user)
+        private void ValidateUpdateUser(User user, string username)
         {
-            if (username == null)
-                throw new ArgumentNullException(nameof(username));
-
             if (user == null)
                 throw new ArgumentNullException(nameof(user));
+
+            if (username == null)
+                throw new ArgumentNullException(nameof(username));
         }
 
         /// <summary>
         /// Processes the server response
         /// </summary>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        private void AfterUpdateUserDefaultImplementation(IUpdateUserApiResponse apiResponseLocalVar, string username, User user)
+        /// <param name="username"></param>
+        private void AfterUpdateUserDefaultImplementation(IUpdateUserApiResponse apiResponseLocalVar, User user, string username)
         {
             bool suppressDefaultLog = false;
-            AfterUpdateUser(ref suppressDefaultLog, apiResponseLocalVar, username, user);
+            AfterUpdateUser(ref suppressDefaultLog, apiResponseLocalVar, user, username);
             if (!suppressDefaultLog)
                 Logger.LogInformation("{0,-9} | {1} | {3}", (apiResponseLocalVar.DownloadedAt - apiResponseLocalVar.RequestedAt).TotalSeconds, apiResponseLocalVar.StatusCode, apiResponseLocalVar.Path);
         }
@@ -2050,9 +2050,9 @@ namespace Org.OpenAPITools.Api
         /// </summary>
         /// <param name="suppressDefaultLog"></param>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        partial void AfterUpdateUser(ref bool suppressDefaultLog, IUpdateUserApiResponse apiResponseLocalVar, string username, User user);
+        /// <param name="username"></param>
+        partial void AfterUpdateUser(ref bool suppressDefaultLog, IUpdateUserApiResponse apiResponseLocalVar, User user, string username);
 
         /// <summary>
         /// Logs exceptions that occur while retrieving the server response
@@ -2060,12 +2060,12 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        private void OnErrorUpdateUserDefaultImplementation(Exception exception, string pathFormat, string path, string username, User user)
+        /// <param name="username"></param>
+        private void OnErrorUpdateUserDefaultImplementation(Exception exception, string pathFormat, string path, User user, string username)
         {
             bool suppressDefaultLog = false;
-            OnErrorUpdateUser(ref suppressDefaultLog, exception, pathFormat, path, username, user);
+            OnErrorUpdateUser(ref suppressDefaultLog, exception, pathFormat, path, user, username);
             if (!suppressDefaultLog)
                 Logger.LogError(exception, "An error occurred while sending the request to the server.");
         }
@@ -2077,22 +2077,22 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        partial void OnErrorUpdateUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, string username, User user);
+        /// <param name="username"></param>
+        partial void OnErrorUpdateUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, User user, string username);
 
         /// <summary>
         /// Updated user This can only be done by the logged in user.
         /// </summary>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        public async Task<IUpdateUserApiResponse> UpdateUserOrDefaultAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<IUpdateUserApiResponse> UpdateUserOrDefaultAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             try
             {
-                return await UpdateUserAsync(username, user, cancellationToken).ConfigureAwait(false);
+                return await UpdateUserAsync(user, username, cancellationToken).ConfigureAwait(false);
             }
             catch (Exception)
             {
@@ -2104,19 +2104,19 @@ namespace Org.OpenAPITools.Api
         /// Updated user This can only be done by the logged in user.
         /// </summary>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        public async Task<IUpdateUserApiResponse> UpdateUserAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<IUpdateUserApiResponse> UpdateUserAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             UriBuilder uriBuilderLocalVar = new UriBuilder();
 
             try
             {
-                ValidateUpdateUser(username, user);
+                ValidateUpdateUser(user, username);
 
-                FormatUpdateUser(ref username, user);
+                FormatUpdateUser(user, ref username);
 
                 using (HttpRequestMessage httpRequestMessageLocalVar = new HttpRequestMessage())
                 {
@@ -2153,7 +2153,7 @@ namespace Org.OpenAPITools.Api
 
                         UpdateUserApiResponse apiResponseLocalVar = new UpdateUserApiResponse(apiResponseLoggerLocalVar, httpRequestMessageLocalVar, httpResponseMessageLocalVar, responseContentLocalVar, "/user/{username}", requestedAtLocalVar, _jsonSerializerOptions);
 
-                        AfterUpdateUserDefaultImplementation(apiResponseLocalVar, username, user);
+                        AfterUpdateUserDefaultImplementation(apiResponseLocalVar, user, username);
 
                         Events.ExecuteOnUpdateUser(apiResponseLocalVar);
 
@@ -2163,7 +2163,7 @@ namespace Org.OpenAPITools.Api
             }
             catch(Exception e)
             {
-                OnErrorUpdateUserDefaultImplementation(e, "/user/{username}", uriBuilderLocalVar.Path, username, user);
+                OnErrorUpdateUserDefaultImplementation(e, "/user/{username}", uriBuilderLocalVar.Path, user, username);
                 Events.ExecuteOnErrorUpdateUser(e);
                 throw;
             }

samples/client/petstore/csharp/generichost/net4.8/Petstore/docs/apis/FakeApi.md

@@ -1067,7 +1067,7 @@ No authorization required
 
 <a id="testendpointparameters"></a>
 # **TestEndpointParameters**
-> void TestEndpointParameters (decimal number, double varDouble, string patternWithoutDelimiter, byte[] varByte, int integer = null, int int32 = null, long int64 = null, float varFloat = null, string varString = null, System.IO.Stream binary = null, DateTime date = null, DateTime dateTime = null, string password = null, string callback = null)
+> void TestEndpointParameters (decimal number, string patternWithoutDelimiter, byte[] varByte, double varDouble, System.IO.Stream binary = null, string callback = null, DateTime date = null, DateTime dateTime = null, int int32 = null, long int64 = null, int integer = null, string password = null, float varFloat = null, string varString = null)
 
 Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
 
@@ -1095,24 +1095,24 @@ namespace Example
 
             var apiInstance = new FakeApi(config);
             var number = 8.14D;  // decimal | None
-            var varDouble = 1.2D;  // double | None
             var patternWithoutDelimiter = "patternWithoutDelimiter_example";  // string | None
             var varByte = System.Text.Encoding.ASCII.GetBytes("BYTE_ARRAY_DATA_HERE");  // byte[] | None
-            var integer = 56;  // int | None (optional) 
-            var int32 = 56;  // int | None (optional) 
-            var int64 = 789L;  // long | None (optional) 
-            var varFloat = 3.4F;  // float | None (optional) 
-            var varString = "varString_example";  // string | None (optional) 
+            var varDouble = 1.2D;  // double | None
             var binary = new System.IO.MemoryStream(System.IO.File.ReadAllBytes("/path/to/file.txt"));  // System.IO.Stream | None (optional) 
+            var callback = "callback_example";  // string | None (optional) 
             var date = DateTime.Parse("2013-10-20");  // DateTime | None (optional) 
             var dateTime = DateTime.Parse(""2010-02-01T10:20:10.111110+01:00"");  // DateTime | None (optional)  (default to "2010-02-01T10:20:10.111110+01:00")
+            var int32 = 56;  // int | None (optional) 
+            var int64 = 789L;  // long | None (optional) 
+            var integer = 56;  // int | None (optional) 
             var password = "password_example";  // string | None (optional) 
-            var callback = "callback_example";  // string | None (optional) 
+            var varFloat = 3.4F;  // float | None (optional) 
+            var varString = "varString_example";  // string | None (optional) 
 
             try
             {
                 // Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
-                apiInstance.TestEndpointParameters(number, varDouble, patternWithoutDelimiter, varByte, integer, int32, int64, varFloat, varString, binary, date, dateTime, password, callback);
+                apiInstance.TestEndpointParameters(number, patternWithoutDelimiter, varByte, varDouble, binary, callback, date, dateTime, int32, int64, integer, password, varFloat, varString);
             }
             catch (ApiException  e)
             {
@@ -1132,7 +1132,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
-    apiInstance.TestEndpointParametersWithHttpInfo(number, varDouble, patternWithoutDelimiter, varByte, integer, int32, int64, varFloat, varString, binary, date, dateTime, password, callback);
+    apiInstance.TestEndpointParametersWithHttpInfo(number, patternWithoutDelimiter, varByte, varDouble, binary, callback, date, dateTime, int32, int64, integer, password, varFloat, varString);
 }
 catch (ApiException e)
 {
@@ -1147,19 +1147,19 @@ catch (ApiException e)
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
 | **number** | **decimal** | None |  |
-| **varDouble** | **double** | None |  |
 | **patternWithoutDelimiter** | **string** | None |  |
 | **varByte** | **byte[]** | None |  |
-| **integer** | **int** | None | [optional]  |
-| **int32** | **int** | None | [optional]  |
-| **int64** | **long** | None | [optional]  |
-| **varFloat** | **float** | None | [optional]  |
-| **varString** | **string** | None | [optional]  |
+| **varDouble** | **double** | None |  |
 | **binary** | **System.IO.Stream****System.IO.Stream** | None | [optional]  |
+| **callback** | **string** | None | [optional]  |
 | **date** | **DateTime** | None | [optional]  |
 | **dateTime** | **DateTime** | None | [optional] [default to &quot;2010-02-01T10:20:10.111110+01:00&quot;] |
+| **int32** | **int** | None | [optional]  |
+| **int64** | **long** | None | [optional]  |
+| **integer** | **int** | None | [optional]  |
 | **password** | **string** | None | [optional]  |
-| **callback** | **string** | None | [optional]  |
+| **varFloat** | **float** | None | [optional]  |
+| **varString** | **string** | None | [optional]  |
 
 ### Return type
 
@@ -1185,7 +1185,7 @@ void (empty response body)
 
 <a id="testenumparameters"></a>
 # **TestEnumParameters**
-> void TestEnumParameters (List<string> enumHeaderStringArray = null, string enumHeaderString = null, List<string> enumQueryStringArray = null, string enumQueryString = null, int enumQueryInteger = null, double enumQueryDouble = null, List<string> enumFormStringArray = null, string enumFormString = null)
+> void TestEnumParameters (string enumFormString = null, List<string> enumFormStringArray = null, string enumHeaderString = null, List<string> enumHeaderStringArray = null, double enumQueryDouble = null, int enumQueryInteger = null, string enumQueryString = null, List<string> enumQueryStringArray = null)
 
 To test enum parameters
 
@@ -1208,19 +1208,19 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new FakeApi(config);
-            var enumHeaderStringArray = new List<string>(); // List<string> | Header parameter enum test (string array) (optional) 
-            var enumHeaderString = "_abc";  // string | Header parameter enum test (string) (optional)  (default to -efg)
-            var enumQueryStringArray = new List<string>(); // List<string> | Query parameter enum test (string array) (optional) 
-            var enumQueryString = "_abc";  // string | Query parameter enum test (string) (optional)  (default to -efg)
-            var enumQueryInteger = 1;  // int | Query parameter enum test (double) (optional) 
-            var enumQueryDouble = 1.1D;  // double | Query parameter enum test (double) (optional) 
-            var enumFormStringArray = new List<string>(); // List<string> | Form parameter enum test (string array) (optional)  (default to $)
             var enumFormString = "_abc";  // string | Form parameter enum test (string) (optional)  (default to -efg)
+            var enumFormStringArray = new List<string>(); // List<string> | Form parameter enum test (string array) (optional)  (default to $)
+            var enumHeaderString = "_abc";  // string | Header parameter enum test (string) (optional)  (default to -efg)
+            var enumHeaderStringArray = new List<string>(); // List<string> | Header parameter enum test (string array) (optional) 
+            var enumQueryDouble = 1.1D;  // double | Query parameter enum test (double) (optional) 
+            var enumQueryInteger = 1;  // int | Query parameter enum test (double) (optional) 
+            var enumQueryString = "_abc";  // string | Query parameter enum test (string) (optional)  (default to -efg)
+            var enumQueryStringArray = new List<string>(); // List<string> | Query parameter enum test (string array) (optional) 
 
             try
             {
                 // To test enum parameters
-                apiInstance.TestEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
+                apiInstance.TestEnumParameters(enumFormString, enumFormStringArray, enumHeaderString, enumHeaderStringArray, enumQueryDouble, enumQueryInteger, enumQueryString, enumQueryStringArray);
             }
             catch (ApiException  e)
             {
@@ -1240,7 +1240,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // To test enum parameters
-    apiInstance.TestEnumParametersWithHttpInfo(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
+    apiInstance.TestEnumParametersWithHttpInfo(enumFormString, enumFormStringArray, enumHeaderString, enumHeaderStringArray, enumQueryDouble, enumQueryInteger, enumQueryString, enumQueryStringArray);
 }
 catch (ApiException e)
 {
@@ -1254,14 +1254,14 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **enumHeaderStringArray** | [**List&lt;string&gt;**](string.md) | Header parameter enum test (string array) | [optional]  |
-| **enumHeaderString** | **string** | Header parameter enum test (string) | [optional] [default to -efg] |
-| **enumQueryStringArray** | [**List&lt;string&gt;**](string.md) | Query parameter enum test (string array) | [optional]  |
-| **enumQueryString** | **string** | Query parameter enum test (string) | [optional] [default to -efg] |
-| **enumQueryInteger** | **int** | Query parameter enum test (double) | [optional]  |
-| **enumQueryDouble** | **double** | Query parameter enum test (double) | [optional]  |
-| **enumFormStringArray** | [**List&lt;string&gt;**](string.md) | Form parameter enum test (string array) | [optional] [default to $] |
 | **enumFormString** | **string** | Form parameter enum test (string) | [optional] [default to -efg] |
+| **enumFormStringArray** | [**List&lt;string&gt;**](string.md) | Form parameter enum test (string array) | [optional] [default to $] |
+| **enumHeaderString** | **string** | Header parameter enum test (string) | [optional] [default to -efg] |
+| **enumHeaderStringArray** | [**List&lt;string&gt;**](string.md) | Header parameter enum test (string array) | [optional]  |
+| **enumQueryDouble** | **double** | Query parameter enum test (double) | [optional]  |
+| **enumQueryInteger** | **int** | Query parameter enum test (double) | [optional]  |
+| **enumQueryString** | **string** | Query parameter enum test (string) | [optional] [default to -efg] |
+| **enumQueryStringArray** | [**List&lt;string&gt;**](string.md) | Query parameter enum test (string array) | [optional]  |
 
 ### Return type
 
@@ -1287,7 +1287,7 @@ No authorization required
 
 <a id="testgroupparameters"></a>
 # **TestGroupParameters**
-> void TestGroupParameters (int requiredStringGroup, bool requiredBooleanGroup, long requiredInt64Group, int stringGroup = null, bool booleanGroup = null, long int64Group = null)
+> void TestGroupParameters (bool requiredBooleanGroup, long requiredInt64Group, int requiredStringGroup, bool booleanGroup = null, long int64Group = null, int stringGroup = null)
 
 Fake endpoint to test group parameters (optional)
 
@@ -1313,17 +1313,17 @@ namespace Example
             config.AccessToken = "YOUR_BEARER_TOKEN";
 
             var apiInstance = new FakeApi(config);
-            var requiredStringGroup = 56;  // int | Required String in group parameters
             var requiredBooleanGroup = true;  // bool | Required Boolean in group parameters
             var requiredInt64Group = 789L;  // long | Required Integer in group parameters
-            var stringGroup = 56;  // int | String in group parameters (optional) 
+            var requiredStringGroup = 56;  // int | Required String in group parameters
             var booleanGroup = true;  // bool | Boolean in group parameters (optional) 
             var int64Group = 789L;  // long | Integer in group parameters (optional) 
+            var stringGroup = 56;  // int | String in group parameters (optional) 
 
             try
             {
                 // Fake endpoint to test group parameters (optional)
-                apiInstance.TestGroupParameters(requiredStringGroup, requiredBooleanGroup, requiredInt64Group, stringGroup, booleanGroup, int64Group);
+                apiInstance.TestGroupParameters(requiredBooleanGroup, requiredInt64Group, requiredStringGroup, booleanGroup, int64Group, stringGroup);
             }
             catch (ApiException  e)
             {
@@ -1343,7 +1343,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Fake endpoint to test group parameters (optional)
-    apiInstance.TestGroupParametersWithHttpInfo(requiredStringGroup, requiredBooleanGroup, requiredInt64Group, stringGroup, booleanGroup, int64Group);
+    apiInstance.TestGroupParametersWithHttpInfo(requiredBooleanGroup, requiredInt64Group, requiredStringGroup, booleanGroup, int64Group, stringGroup);
 }
 catch (ApiException e)
 {
@@ -1357,12 +1357,12 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **requiredStringGroup** | **int** | Required String in group parameters |  |
 | **requiredBooleanGroup** | **bool** | Required Boolean in group parameters |  |
 | **requiredInt64Group** | **long** | Required Integer in group parameters |  |
-| **stringGroup** | **int** | String in group parameters | [optional]  |
+| **requiredStringGroup** | **int** | Required String in group parameters |  |
 | **booleanGroup** | **bool** | Boolean in group parameters | [optional]  |
 | **int64Group** | **long** | Integer in group parameters | [optional]  |
+| **stringGroup** | **int** | String in group parameters | [optional]  |
 
 ### Return type
 
@@ -1644,7 +1644,7 @@ No authorization required
 
 <a id="testqueryparametercollectionformat"></a>
 # **TestQueryParameterCollectionFormat**
-> void TestQueryParameterCollectionFormat (List<string> pipe, List<string> ioutil, List<string> http, List<string> url, List<string> context, string requiredNotNullable, string requiredNullable, string notRequiredNotNullable = null, string notRequiredNullable = null)
+> void TestQueryParameterCollectionFormat (List<string> context, List<string> http, List<string> ioutil, List<string> pipe, string requiredNotNullable, List<string> url, string notRequiredNotNullable = null, string notRequiredNullable = null, string requiredNullable)
 
 
 
@@ -1667,19 +1667,19 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new FakeApi(config);
-            var pipe = new List<string>(); // List<string> | 
-            var ioutil = new List<string>(); // List<string> | 
-            var http = new List<string>(); // List<string> | 
-            var url = new List<string>(); // List<string> | 
             var context = new List<string>(); // List<string> | 
+            var http = new List<string>(); // List<string> | 
+            var ioutil = new List<string>(); // List<string> | 
+            var pipe = new List<string>(); // List<string> | 
             var requiredNotNullable = "requiredNotNullable_example";  // string | 
-            var requiredNullable = "requiredNullable_example";  // string | 
+            var url = new List<string>(); // List<string> | 
             var notRequiredNotNullable = "notRequiredNotNullable_example";  // string |  (optional) 
             var notRequiredNullable = "notRequiredNullable_example";  // string |  (optional) 
+            var requiredNullable = "requiredNullable_example";  // string | 
 
             try
             {
-                apiInstance.TestQueryParameterCollectionFormat(pipe, ioutil, http, url, context, requiredNotNullable, requiredNullable, notRequiredNotNullable, notRequiredNullable);
+                apiInstance.TestQueryParameterCollectionFormat(context, http, ioutil, pipe, requiredNotNullable, url, notRequiredNotNullable, notRequiredNullable, requiredNullable);
             }
             catch (ApiException  e)
             {
@@ -1698,7 +1698,7 @@ This returns an ApiResponse object which contains the response data, status code
 ```csharp
 try
 {
-    apiInstance.TestQueryParameterCollectionFormatWithHttpInfo(pipe, ioutil, http, url, context, requiredNotNullable, requiredNullable, notRequiredNotNullable, notRequiredNullable);
+    apiInstance.TestQueryParameterCollectionFormatWithHttpInfo(context, http, ioutil, pipe, requiredNotNullable, url, notRequiredNotNullable, notRequiredNullable, requiredNullable);
 }
 catch (ApiException e)
 {
@@ -1712,15 +1712,15 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **pipe** | [**List&lt;string&gt;**](string.md) |  |  |
-| **ioutil** | [**List&lt;string&gt;**](string.md) |  |  |
-| **http** | [**List&lt;string&gt;**](string.md) |  |  |
-| **url** | [**List&lt;string&gt;**](string.md) |  |  |
 | **context** | [**List&lt;string&gt;**](string.md) |  |  |
+| **http** | [**List&lt;string&gt;**](string.md) |  |  |
+| **ioutil** | [**List&lt;string&gt;**](string.md) |  |  |
+| **pipe** | [**List&lt;string&gt;**](string.md) |  |  |
 | **requiredNotNullable** | **string** |  |  |
-| **requiredNullable** | **string** |  |  |
+| **url** | [**List&lt;string&gt;**](string.md) |  |  |
 | **notRequiredNotNullable** | **string** |  | [optional]  |
 | **notRequiredNullable** | **string** |  | [optional]  |
+| **requiredNullable** | **string** |  |  |
 
 ### Return type
 

samples/client/petstore/csharp/generichost/net4.8/Petstore/docs/apis/UserApi.md

@@ -453,7 +453,7 @@ No authorization required
 
 <a id="loginuser"></a>
 # **LoginUser**
-> string LoginUser (string username, string password)
+> string LoginUser (string password, string username)
 
 Logs user into the system
 
@@ -474,13 +474,13 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new UserApi(config);
-            var username = "username_example";  // string | The user name for login
             var password = "password_example";  // string | The password for login in clear text
+            var username = "username_example";  // string | The user name for login
 
             try
             {
                 // Logs user into the system
-                string result = apiInstance.LoginUser(username, password);
+                string result = apiInstance.LoginUser(password, username);
                 Debug.WriteLine(result);
             }
             catch (ApiException  e)
@@ -501,7 +501,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Logs user into the system
-    ApiResponse<string> response = apiInstance.LoginUserWithHttpInfo(username, password);
+    ApiResponse<string> response = apiInstance.LoginUserWithHttpInfo(password, username);
     Debug.Write("Status Code: " + response.StatusCode);
     Debug.Write("Response Headers: " + response.Headers);
     Debug.Write("Response Body: " + response.Data);
@@ -518,8 +518,8 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **username** | **string** | The user name for login |  |
 | **password** | **string** | The password for login in clear text |  |
+| **username** | **string** | The user name for login |  |
 
 ### Return type
 
@@ -625,7 +625,7 @@ No authorization required
 
 <a id="updateuser"></a>
 # **UpdateUser**
-> void UpdateUser (string username, User user)
+> void UpdateUser (User user, string username)
 
 Updated user
 
@@ -648,13 +648,13 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new UserApi(config);
-            var username = "username_example";  // string | name that need to be deleted
             var user = new User(); // User | Updated user object
+            var username = "username_example";  // string | name that need to be deleted
 
             try
             {
                 // Updated user
-                apiInstance.UpdateUser(username, user);
+                apiInstance.UpdateUser(user, username);
             }
             catch (ApiException  e)
             {
@@ -674,7 +674,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Updated user
-    apiInstance.UpdateUserWithHttpInfo(username, user);
+    apiInstance.UpdateUserWithHttpInfo(user, username);
 }
 catch (ApiException e)
 {
@@ -688,8 +688,8 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **username** | **string** | name that need to be deleted |  |
 | **user** | [**User**](User.md) | Updated user object |  |
+| **username** | **string** | name that need to be deleted |  |
 
 ### Return type
 

samples/client/petstore/csharp/generichost/net4.8/Petstore/src/Org.OpenAPITools.Test/Api/FakeApiTests.cs

@@ -193,20 +193,20 @@ namespace Org.OpenAPITools.Test.Api
         public async Task TestEndpointParametersAsyncTest()
         {
             decimal number = default;
-            double varDouble = default;
             string patternWithoutDelimiter = default;
             byte[] varByte = default;
-            Client.Option<int> integer = default;
-            Client.Option<int> int32 = default;
-            Client.Option<long> int64 = default;
-            Client.Option<float> varFloat = default;
-            Client.Option<string> varString = default;
+            double varDouble = default;
             Client.Option<System.IO.Stream> binary = default;
+            Client.Option<string> callback = default;
             Client.Option<DateTime> date = default;
             Client.Option<DateTime> dateTime = default;
+            Client.Option<int> int32 = default;
+            Client.Option<long> int64 = default;
+            Client.Option<int> integer = default;
             Client.Option<string> password = default;
-            Client.Option<string> callback = default;
-            await _instance.TestEndpointParametersAsync(number, varDouble, patternWithoutDelimiter, varByte, integer, int32, int64, varFloat, varString, binary, date, dateTime, password, callback);
+            Client.Option<float> varFloat = default;
+            Client.Option<string> varString = default;
+            await _instance.TestEndpointParametersAsync(number, patternWithoutDelimiter, varByte, varDouble, binary, callback, date, dateTime, int32, int64, integer, password, varFloat, varString);
         }
 
         /// <summary>
@@ -215,15 +215,15 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task TestEnumParametersAsyncTest()
         {
-            Client.Option<List<string>> enumHeaderStringArray = default;
-            Client.Option<string> enumHeaderString = default;
-            Client.Option<List<string>> enumQueryStringArray = default;
-            Client.Option<string> enumQueryString = default;
-            Client.Option<int> enumQueryInteger = default;
-            Client.Option<double> enumQueryDouble = default;
-            Client.Option<List<string>> enumFormStringArray = default;
             Client.Option<string> enumFormString = default;
-            await _instance.TestEnumParametersAsync(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
+            Client.Option<List<string>> enumFormStringArray = default;
+            Client.Option<string> enumHeaderString = default;
+            Client.Option<List<string>> enumHeaderStringArray = default;
+            Client.Option<double> enumQueryDouble = default;
+            Client.Option<int> enumQueryInteger = default;
+            Client.Option<string> enumQueryString = default;
+            Client.Option<List<string>> enumQueryStringArray = default;
+            await _instance.TestEnumParametersAsync(enumFormString, enumFormStringArray, enumHeaderString, enumHeaderStringArray, enumQueryDouble, enumQueryInteger, enumQueryString, enumQueryStringArray);
         }
 
         /// <summary>
@@ -232,13 +232,13 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task TestGroupParametersAsyncTest()
         {
-            int requiredStringGroup = default;
             bool requiredBooleanGroup = default;
             long requiredInt64Group = default;
-            Client.Option<int> stringGroup = default;
+            int requiredStringGroup = default;
             Client.Option<bool> booleanGroup = default;
             Client.Option<long> int64Group = default;
-            await _instance.TestGroupParametersAsync(requiredStringGroup, requiredBooleanGroup, requiredInt64Group, stringGroup, booleanGroup, int64Group);
+            Client.Option<int> stringGroup = default;
+            await _instance.TestGroupParametersAsync(requiredBooleanGroup, requiredInt64Group, requiredStringGroup, booleanGroup, int64Group, stringGroup);
         }
 
         /// <summary>
@@ -278,16 +278,16 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task TestQueryParameterCollectionFormatAsyncTest()
         {
-            List<string> pipe = default;
-            List<string> ioutil = default;
-            List<string> http = default;
-            List<string> url = default;
             List<string> context = default;
+            List<string> http = default;
+            List<string> ioutil = default;
+            List<string> pipe = default;
             string requiredNotNullable = default;
-            string requiredNullable = default;
+            List<string> url = default;
             Client.Option<string> notRequiredNotNullable = default;
             Client.Option<string> notRequiredNullable = default;
-            await _instance.TestQueryParameterCollectionFormatAsync(pipe, ioutil, http, url, context, requiredNotNullable, requiredNullable, notRequiredNotNullable, notRequiredNullable);
+            string requiredNullable = default;
+            await _instance.TestQueryParameterCollectionFormatAsync(context, http, ioutil, pipe, requiredNotNullable, url, notRequiredNotNullable, notRequiredNullable, requiredNullable);
         }
 
         /// <summary>

samples/client/petstore/csharp/generichost/net4.8/Petstore/src/Org.OpenAPITools.Test/Api/UserApiTests.cs

@@ -108,9 +108,9 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task LoginUserAsyncTest()
         {
-            string username = default;
             string password = default;
-            var response = await _instance.LoginUserAsync(username, password);
+            string username = default;
+            var response = await _instance.LoginUserAsync(password, username);
             var model = response.Ok();
             Assert.IsType<string>(model);
         }
@@ -130,9 +130,9 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task UpdateUserAsyncTest()
         {
-            string username = default;
             User user = default;
-            await _instance.UpdateUserAsync(username, user);
+            string username = default;
+            await _instance.UpdateUserAsync(user, username);
         }
     }
 }

samples/client/petstore/csharp/generichost/net4.8/Petstore/src/Org.OpenAPITools/Api/UserApi.cs

@@ -155,11 +155,11 @@ namespace Org.OpenAPITools.Api
         /// 
         /// </remarks>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        Task<ILoginUserApiResponse> LoginUserAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default);
+        Task<ILoginUserApiResponse> LoginUserAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Logs user into the system
@@ -167,11 +167,11 @@ namespace Org.OpenAPITools.Api
         /// <remarks>
         /// 
         /// </remarks>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        Task<ILoginUserApiResponse> LoginUserOrDefaultAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default);
+        Task<ILoginUserApiResponse> LoginUserOrDefaultAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Logs out current logged in user session
@@ -201,11 +201,11 @@ namespace Org.OpenAPITools.Api
         /// This can only be done by the logged in user.
         /// </remarks>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        Task<IUpdateUserApiResponse> UpdateUserAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default);
+        Task<IUpdateUserApiResponse> UpdateUserAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Updated user
@@ -213,11 +213,11 @@ namespace Org.OpenAPITools.Api
         /// <remarks>
         /// This can only be done by the logged in user.
         /// </remarks>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        Task<IUpdateUserApiResponse> UpdateUserOrDefaultAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default);
+        Task<IUpdateUserApiResponse> UpdateUserOrDefaultAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default);
     }
 
     /// <summary>
@@ -1622,33 +1622,33 @@ namespace Org.OpenAPITools.Api
             partial void OnDeserializationError(ref bool suppressDefaultLog, Exception exception, HttpStatusCode httpStatusCode);
         }
 
-        partial void FormatLoginUser(ref string username, ref string password);
+        partial void FormatLoginUser(ref string password, ref string username);
 
         /// <summary>
         /// Validates the request parameters
         /// </summary>
-        /// <param name="username"></param>
         /// <param name="password"></param>
+        /// <param name="username"></param>
         /// <returns></returns>
-        private void ValidateLoginUser(string username, string password)
+        private void ValidateLoginUser(string password, string username)
         {
-            if (username == null)
-                throw new ArgumentNullException(nameof(username));
-
             if (password == null)
                 throw new ArgumentNullException(nameof(password));
+
+            if (username == null)
+                throw new ArgumentNullException(nameof(username));
         }
 
         /// <summary>
         /// Processes the server response
         /// </summary>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        private void AfterLoginUserDefaultImplementation(ILoginUserApiResponse apiResponseLocalVar, string username, string password)
+        /// <param name="username"></param>
+        private void AfterLoginUserDefaultImplementation(ILoginUserApiResponse apiResponseLocalVar, string password, string username)
         {
             bool suppressDefaultLog = false;
-            AfterLoginUser(ref suppressDefaultLog, apiResponseLocalVar, username, password);
+            AfterLoginUser(ref suppressDefaultLog, apiResponseLocalVar, password, username);
             if (!suppressDefaultLog)
                 Logger.LogInformation("{0,-9} | {1} | {3}", (apiResponseLocalVar.DownloadedAt - apiResponseLocalVar.RequestedAt).TotalSeconds, apiResponseLocalVar.StatusCode, apiResponseLocalVar.Path);
         }
@@ -1658,9 +1658,9 @@ namespace Org.OpenAPITools.Api
         /// </summary>
         /// <param name="suppressDefaultLog"></param>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        partial void AfterLoginUser(ref bool suppressDefaultLog, ILoginUserApiResponse apiResponseLocalVar, string username, string password);
+        /// <param name="username"></param>
+        partial void AfterLoginUser(ref bool suppressDefaultLog, ILoginUserApiResponse apiResponseLocalVar, string password, string username);
 
         /// <summary>
         /// Logs exceptions that occur while retrieving the server response
@@ -1668,12 +1668,12 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        private void OnErrorLoginUserDefaultImplementation(Exception exception, string pathFormat, string path, string username, string password)
+        /// <param name="username"></param>
+        private void OnErrorLoginUserDefaultImplementation(Exception exception, string pathFormat, string path, string password, string username)
         {
             bool suppressDefaultLog = false;
-            OnErrorLoginUser(ref suppressDefaultLog, exception, pathFormat, path, username, password);
+            OnErrorLoginUser(ref suppressDefaultLog, exception, pathFormat, path, password, username);
             if (!suppressDefaultLog)
                 Logger.LogError(exception, "An error occurred while sending the request to the server.");
         }
@@ -1685,22 +1685,22 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        partial void OnErrorLoginUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, string username, string password);
+        /// <param name="username"></param>
+        partial void OnErrorLoginUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, string password, string username);
 
         /// <summary>
         /// Logs user into the system 
         /// </summary>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        public async Task<ILoginUserApiResponse> LoginUserOrDefaultAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<ILoginUserApiResponse> LoginUserOrDefaultAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             try
             {
-                return await LoginUserAsync(username, password, cancellationToken).ConfigureAwait(false);
+                return await LoginUserAsync(password, username, cancellationToken).ConfigureAwait(false);
             }
             catch (Exception)
             {
@@ -1712,19 +1712,19 @@ namespace Org.OpenAPITools.Api
         /// Logs user into the system 
         /// </summary>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        public async Task<ILoginUserApiResponse> LoginUserAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<ILoginUserApiResponse> LoginUserAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             UriBuilder uriBuilderLocalVar = new UriBuilder();
 
             try
             {
-                ValidateLoginUser(username, password);
+                ValidateLoginUser(password, username);
 
-                FormatLoginUser(ref username, ref password);
+                FormatLoginUser(ref password, ref username);
 
                 using (HttpRequestMessage httpRequestMessageLocalVar = new HttpRequestMessage())
                 {
@@ -1735,8 +1735,8 @@ namespace Org.OpenAPITools.Api
 
                     System.Collections.Specialized.NameValueCollection parseQueryStringLocalVar = System.Web.HttpUtility.ParseQueryString(string.Empty);
 
-                    parseQueryStringLocalVar["username"] = ClientUtils.ParameterToString(username);
                     parseQueryStringLocalVar["password"] = ClientUtils.ParameterToString(password);
+                    parseQueryStringLocalVar["username"] = ClientUtils.ParameterToString(username);
 
                     uriBuilderLocalVar.Query = parseQueryStringLocalVar.ToString();
 
@@ -1763,7 +1763,7 @@ namespace Org.OpenAPITools.Api
 
                         LoginUserApiResponse apiResponseLocalVar = new LoginUserApiResponse(apiResponseLoggerLocalVar, httpRequestMessageLocalVar, httpResponseMessageLocalVar, responseContentLocalVar, "/user/login", requestedAtLocalVar, _jsonSerializerOptions);
 
-                        AfterLoginUserDefaultImplementation(apiResponseLocalVar, username, password);
+                        AfterLoginUserDefaultImplementation(apiResponseLocalVar, password, username);
 
                         Events.ExecuteOnLoginUser(apiResponseLocalVar);
 
@@ -1773,7 +1773,7 @@ namespace Org.OpenAPITools.Api
             }
             catch(Exception e)
             {
-                OnErrorLoginUserDefaultImplementation(e, "/user/login", uriBuilderLocalVar.Path, username, password);
+                OnErrorLoginUserDefaultImplementation(e, "/user/login", uriBuilderLocalVar.Path, password, username);
                 Events.ExecuteOnErrorLoginUser(e);
                 throw;
             }
@@ -2014,33 +2014,33 @@ namespace Org.OpenAPITools.Api
             partial void OnDeserializationError(ref bool suppressDefaultLog, Exception exception, HttpStatusCode httpStatusCode);
         }
 
-        partial void FormatUpdateUser(ref string username, User user);
+        partial void FormatUpdateUser(User user, ref string username);
 
         /// <summary>
         /// Validates the request parameters
         /// </summary>
-        /// <param name="username"></param>
         /// <param name="user"></param>
+        /// <param name="username"></param>
         /// <returns></returns>
-        private void ValidateUpdateUser(string username, User user)
+        private void ValidateUpdateUser(User user, string username)
         {
-            if (username == null)
-                throw new ArgumentNullException(nameof(username));
-
             if (user == null)
                 throw new ArgumentNullException(nameof(user));
+
+            if (username == null)
+                throw new ArgumentNullException(nameof(username));
         }
 
         /// <summary>
         /// Processes the server response
         /// </summary>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        private void AfterUpdateUserDefaultImplementation(IUpdateUserApiResponse apiResponseLocalVar, string username, User user)
+        /// <param name="username"></param>
+        private void AfterUpdateUserDefaultImplementation(IUpdateUserApiResponse apiResponseLocalVar, User user, string username)
         {
             bool suppressDefaultLog = false;
-            AfterUpdateUser(ref suppressDefaultLog, apiResponseLocalVar, username, user);
+            AfterUpdateUser(ref suppressDefaultLog, apiResponseLocalVar, user, username);
             if (!suppressDefaultLog)
                 Logger.LogInformation("{0,-9} | {1} | {3}", (apiResponseLocalVar.DownloadedAt - apiResponseLocalVar.RequestedAt).TotalSeconds, apiResponseLocalVar.StatusCode, apiResponseLocalVar.Path);
         }
@@ -2050,9 +2050,9 @@ namespace Org.OpenAPITools.Api
         /// </summary>
         /// <param name="suppressDefaultLog"></param>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        partial void AfterUpdateUser(ref bool suppressDefaultLog, IUpdateUserApiResponse apiResponseLocalVar, string username, User user);
+        /// <param name="username"></param>
+        partial void AfterUpdateUser(ref bool suppressDefaultLog, IUpdateUserApiResponse apiResponseLocalVar, User user, string username);
 
         /// <summary>
         /// Logs exceptions that occur while retrieving the server response
@@ -2060,12 +2060,12 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        private void OnErrorUpdateUserDefaultImplementation(Exception exception, string pathFormat, string path, string username, User user)
+        /// <param name="username"></param>
+        private void OnErrorUpdateUserDefaultImplementation(Exception exception, string pathFormat, string path, User user, string username)
         {
             bool suppressDefaultLog = false;
-            OnErrorUpdateUser(ref suppressDefaultLog, exception, pathFormat, path, username, user);
+            OnErrorUpdateUser(ref suppressDefaultLog, exception, pathFormat, path, user, username);
             if (!suppressDefaultLog)
                 Logger.LogError(exception, "An error occurred while sending the request to the server.");
         }
@@ -2077,22 +2077,22 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        partial void OnErrorUpdateUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, string username, User user);
+        /// <param name="username"></param>
+        partial void OnErrorUpdateUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, User user, string username);
 
         /// <summary>
         /// Updated user This can only be done by the logged in user.
         /// </summary>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        public async Task<IUpdateUserApiResponse> UpdateUserOrDefaultAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<IUpdateUserApiResponse> UpdateUserOrDefaultAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             try
             {
-                return await UpdateUserAsync(username, user, cancellationToken).ConfigureAwait(false);
+                return await UpdateUserAsync(user, username, cancellationToken).ConfigureAwait(false);
             }
             catch (Exception)
             {
@@ -2104,19 +2104,19 @@ namespace Org.OpenAPITools.Api
         /// Updated user This can only be done by the logged in user.
         /// </summary>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        public async Task<IUpdateUserApiResponse> UpdateUserAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<IUpdateUserApiResponse> UpdateUserAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             UriBuilder uriBuilderLocalVar = new UriBuilder();
 
             try
             {
-                ValidateUpdateUser(username, user);
+                ValidateUpdateUser(user, username);
 
-                FormatUpdateUser(ref username, user);
+                FormatUpdateUser(user, ref username);
 
                 using (HttpRequestMessage httpRequestMessageLocalVar = new HttpRequestMessage())
                 {
@@ -2153,7 +2153,7 @@ namespace Org.OpenAPITools.Api
 
                         UpdateUserApiResponse apiResponseLocalVar = new UpdateUserApiResponse(apiResponseLoggerLocalVar, httpRequestMessageLocalVar, httpResponseMessageLocalVar, responseContentLocalVar, "/user/{username}", requestedAtLocalVar, _jsonSerializerOptions);
 
-                        AfterUpdateUserDefaultImplementation(apiResponseLocalVar, username, user);
+                        AfterUpdateUserDefaultImplementation(apiResponseLocalVar, user, username);
 
                         Events.ExecuteOnUpdateUser(apiResponseLocalVar);
 
@@ -2163,7 +2163,7 @@ namespace Org.OpenAPITools.Api
             }
             catch(Exception e)
             {
-                OnErrorUpdateUserDefaultImplementation(e, "/user/{username}", uriBuilderLocalVar.Path, username, user);
+                OnErrorUpdateUserDefaultImplementation(e, "/user/{username}", uriBuilderLocalVar.Path, user, username);
                 Events.ExecuteOnErrorUpdateUser(e);
                 throw;
             }

samples/client/petstore/csharp/generichost/net8/AllOf/docs/models/Adult.md

@@ -5,9 +5,9 @@ A representation of an adult
 
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
-**Type** | **string** |  | [optional] 
-**LastName** | **string** |  | [optional] 
 **FirstName** | **string** |  | [optional] 
+**LastName** | **string** |  | [optional] 
+**Type** | **string** |  | [optional] 
 **Children** | [**List<Child>**](Child.md) |  | [optional] 
 
 [[Back to Model list]](../../README.md#documentation-for-models) [[Back to API list]](../../README.md#documentation-for-api-endpoints) [[Back to README]](../../README.md)

samples/client/petstore/csharp/generichost/net8/AllOf/docs/models/Child.md

@@ -5,11 +5,11 @@ A representation of a child
 
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
-**Type** | **string** |  | [optional] 
-**LastName** | **string** |  | [optional] 
 **FirstName** | **string** |  | [optional] 
-**BoosterSeat** | **bool** |  | [optional] 
+**LastName** | **string** |  | [optional] 
+**Type** | **string** |  | [optional] 
 **Age** | **int** |  | [optional] 
+**BoosterSeat** | **bool** |  | [optional] 
 
 [[Back to Model list]](../../README.md#documentation-for-models) [[Back to API list]](../../README.md#documentation-for-api-endpoints) [[Back to README]](../../README.md)
 

samples/client/petstore/csharp/generichost/net8/AllOf/docs/models/Person.md

@@ -4,9 +4,9 @@
 
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
-**Type** | **string** |  | [optional] 
-**LastName** | **string** |  | [optional] 
 **FirstName** | **string** |  | [optional] 
+**LastName** | **string** |  | [optional] 
+**Type** | **string** |  | [optional] 
 
 [[Back to Model list]](../../README.md#documentation-for-models) [[Back to API list]](../../README.md#documentation-for-api-endpoints) [[Back to README]](../../README.md)
 

samples/client/petstore/csharp/generichost/net8/AllOf/src/Org.OpenAPITools.Test/Model/ChildTests.cs

@@ -53,15 +53,6 @@ namespace Org.OpenAPITools.Test.Model
             //Assert.IsType<Child>(instance);
         }
 
-        /// <summary>
-        /// Test the property 'BoosterSeat'
-        /// </summary>
-        [Fact]
-        public void BoosterSeatTest()
-        {
-            // TODO unit test for the property 'BoosterSeat'
-        }
-
         /// <summary>
         /// Test the property 'Age'
         /// </summary>
@@ -70,5 +61,14 @@ namespace Org.OpenAPITools.Test.Model
         {
             // TODO unit test for the property 'Age'
         }
+
+        /// <summary>
+        /// Test the property 'BoosterSeat'
+        /// </summary>
+        [Fact]
+        public void BoosterSeatTest()
+        {
+            // TODO unit test for the property 'BoosterSeat'
+        }
     }
 }

samples/client/petstore/csharp/generichost/net8/AllOf/src/Org.OpenAPITools.Test/Model/PersonTests.cs

@@ -74,12 +74,12 @@ namespace Org.OpenAPITools.Test.Model
         }
 
         /// <summary>
-        /// Test the property 'Type'
+        /// Test the property 'FirstName'
         /// </summary>
         [Fact]
-        public void TypeTest()
+        public void FirstNameTest()
         {
-            // TODO unit test for the property 'Type'
+            // TODO unit test for the property 'FirstName'
         }
 
         /// <summary>
@@ -92,12 +92,12 @@ namespace Org.OpenAPITools.Test.Model
         }
 
         /// <summary>
-        /// Test the property 'FirstName'
+        /// Test the property 'Type'
         /// </summary>
         [Fact]
-        public void FirstNameTest()
+        public void TypeTest()
         {
-            // TODO unit test for the property 'FirstName'
+            // TODO unit test for the property 'Type'
         }
     }
 }

samples/client/petstore/csharp/generichost/net8/AllOf/src/Org.OpenAPITools/Model/Adult.cs

@@ -34,11 +34,11 @@ namespace Org.OpenAPITools.Model
         /// <summary>
         /// Initializes a new instance of the <see cref="Adult" /> class.
         /// </summary>
-        /// <param name="lastName">lastName</param>
-        /// <param name="firstName">firstName</param>
         /// <param name="children">children</param>
+        /// <param name="firstName">firstName</param>
+        /// <param name="lastName">lastName</param>
         [JsonConstructor]
-        public Adult(Option<string?> lastName = default, Option<string?> firstName = default, Option<List<Child>?> children = default) : base(lastName, firstName)
+        public Adult(Option<List<Child>?> children = default, Option<string?> firstName = default, Option<string?> lastName = default) : base(firstName, lastName)
         {
             ChildrenOption = children;
             OnCreated();
@@ -46,13 +46,6 @@ namespace Org.OpenAPITools.Model
 
         partial void OnCreated();
 
-        /// <summary>
-        /// The discriminator
-        /// </summary>
-        [JsonIgnore]
-        [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
-        public new string Type { get; } = "Adult";
-
         /// <summary>
         /// Used to track the state of Children
         /// </summary>
@@ -66,6 +59,13 @@ namespace Org.OpenAPITools.Model
         [JsonPropertyName("children")]
         public List<Child>? Children { get { return this.ChildrenOption; } set { this.ChildrenOption = new(value); } }
 
+        /// <summary>
+        /// The discriminator
+        /// </summary>
+        [JsonIgnore]
+        [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
+        public new string Type { get; } = "Adult";
+
         /// <summary>
         /// Returns the string presentation of the object
         /// </summary>
@@ -103,10 +103,10 @@ namespace Org.OpenAPITools.Model
 
             JsonTokenType startingTokenType = utf8JsonReader.TokenType;
 
-            Option<string?> type = default;
-            Option<string?> lastName = default;
-            Option<string?> firstName = default;
             Option<List<Child>?> children = default;
+            Option<string?> firstName = default;
+            Option<string?> lastName = default;
+            Option<string?> type = default;
 
             while (utf8JsonReader.Read())
             {
@@ -123,18 +123,18 @@ namespace Org.OpenAPITools.Model
 
                     switch (localVarJsonPropertyName)
                     {
-                        case "$_type":
-                            type = new Option<string?>(utf8JsonReader.GetString()!);
-                            break;
-                        case "lastName":
-                            lastName = new Option<string?>(utf8JsonReader.GetString()!);
+                        case "children":
+                            if (utf8JsonReader.TokenType != JsonTokenType.Null)
+                                children = new Option<List<Child>?>(JsonSerializer.Deserialize<List<Child>>(ref utf8JsonReader, jsonSerializerOptions)!);
                             break;
                         case "firstName":
                             firstName = new Option<string?>(utf8JsonReader.GetString()!);
                             break;
-                        case "children":
-                            if (utf8JsonReader.TokenType != JsonTokenType.Null)
-                                children = new Option<List<Child>?>(JsonSerializer.Deserialize<List<Child>>(ref utf8JsonReader, jsonSerializerOptions)!);
+                        case "lastName":
+                            lastName = new Option<string?>(utf8JsonReader.GetString()!);
+                            break;
+                        case "$_type":
+                            type = new Option<string?>(utf8JsonReader.GetString()!);
                             break;
                         default:
                             break;
@@ -142,19 +142,19 @@ namespace Org.OpenAPITools.Model
                 }
             }
 
-            if (type.IsSet && type.Value == null)
-                throw new ArgumentNullException(nameof(type), "Property is not nullable for class Adult.");
-
-            if (lastName.IsSet && lastName.Value == null)
-                throw new ArgumentNullException(nameof(lastName), "Property is not nullable for class Adult.");
+            if (children.IsSet && children.Value == null)
+                throw new ArgumentNullException(nameof(children), "Property is not nullable for class Adult.");
 
             if (firstName.IsSet && firstName.Value == null)
                 throw new ArgumentNullException(nameof(firstName), "Property is not nullable for class Adult.");
 
-            if (children.IsSet && children.Value == null)
-                throw new ArgumentNullException(nameof(children), "Property is not nullable for class Adult.");
+            if (lastName.IsSet && lastName.Value == null)
+                throw new ArgumentNullException(nameof(lastName), "Property is not nullable for class Adult.");
 
-            return new Adult(lastName, firstName, children);
+            if (type.IsSet && type.Value == null)
+                throw new ArgumentNullException(nameof(type), "Property is not nullable for class Adult.");
+
+            return new Adult(children, firstName, lastName);
         }
 
         /// <summary>
@@ -181,28 +181,27 @@ namespace Org.OpenAPITools.Model
         /// <exception cref="NotImplementedException"></exception>
         public void WriteProperties(Utf8JsonWriter writer, Adult adult, JsonSerializerOptions jsonSerializerOptions)
         {
-            if (adult.LastNameOption.IsSet && adult.LastName == null)
-                throw new ArgumentNullException(nameof(adult.LastName), "Property is required for class Adult.");
+            if (adult.ChildrenOption.IsSet && adult.Children == null)
+                throw new ArgumentNullException(nameof(adult.Children), "Property is required for class Adult.");
 
             if (adult.FirstNameOption.IsSet && adult.FirstName == null)
                 throw new ArgumentNullException(nameof(adult.FirstName), "Property is required for class Adult.");
 
-            if (adult.ChildrenOption.IsSet && adult.Children == null)
-                throw new ArgumentNullException(nameof(adult.Children), "Property is required for class Adult.");
-
-            writer.WriteString("$_type", adult.Type);
-
-            if (adult.LastNameOption.IsSet)
-                writer.WriteString("lastName", adult.LastName);
-
-            if (adult.FirstNameOption.IsSet)
-                writer.WriteString("firstName", adult.FirstName);
+            if (adult.LastNameOption.IsSet && adult.LastName == null)
+                throw new ArgumentNullException(nameof(adult.LastName), "Property is required for class Adult.");
 
             if (adult.ChildrenOption.IsSet)
             {
                 writer.WritePropertyName("children");
                 JsonSerializer.Serialize(writer, adult.Children, jsonSerializerOptions);
             }
+            if (adult.FirstNameOption.IsSet)
+                writer.WriteString("firstName", adult.FirstName);
+
+            if (adult.LastNameOption.IsSet)
+                writer.WriteString("lastName", adult.LastName);
+
+            writer.WriteString("$_type", adult.Type);
         }
     }
 }

samples/client/petstore/csharp/generichost/net8/AllOf/src/Org.OpenAPITools/Model/Child.cs

@@ -34,12 +34,12 @@ namespace Org.OpenAPITools.Model
         /// <summary>
         /// Initializes a new instance of the <see cref="Child" /> class.
         /// </summary>
-        /// <param name="lastName">lastName</param>
-        /// <param name="firstName">firstName</param>
         /// <param name="age">age</param>
+        /// <param name="firstName">firstName</param>
+        /// <param name="lastName">lastName</param>
         /// <param name="boosterSeat">boosterSeat</param>
         [JsonConstructor]
-        public Child(Option<string?> lastName = default, Option<string?> firstName = default, Option<int?> age = default, Option<bool?> boosterSeat = default) : base(lastName, firstName)
+        public Child(Option<int?> age = default, Option<string?> firstName = default, Option<string?> lastName = default, Option<bool?> boosterSeat = default) : base(firstName, lastName)
         {
             AgeOption = age;
             BoosterSeatOption = boosterSeat;
@@ -48,13 +48,6 @@ namespace Org.OpenAPITools.Model
 
         partial void OnCreated();
 
-        /// <summary>
-        /// The discriminator
-        /// </summary>
-        [JsonIgnore]
-        [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
-        public new string Type { get; } = "Child";
-
         /// <summary>
         /// Used to track the state of Age
         /// </summary>
@@ -68,6 +61,13 @@ namespace Org.OpenAPITools.Model
         [JsonPropertyName("age")]
         public int? Age { get { return this.AgeOption; } set { this.AgeOption = new(value); } }
 
+        /// <summary>
+        /// The discriminator
+        /// </summary>
+        [JsonIgnore]
+        [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
+        public new string Type { get; } = "Child";
+
         /// <summary>
         /// Used to track the state of BoosterSeat
         /// </summary>
@@ -90,8 +90,8 @@ namespace Org.OpenAPITools.Model
             StringBuilder sb = new StringBuilder();
             sb.Append("class Child {\n");
             sb.Append("  ").Append(base.ToString()?.Replace("\n", "\n  ")).Append("\n");
-            sb.Append("  BoosterSeat: ").Append(BoosterSeat).Append("\n");
             sb.Append("  Age: ").Append(Age).Append("\n");
+            sb.Append("  BoosterSeat: ").Append(BoosterSeat).Append("\n");
             sb.Append("}\n");
             return sb.ToString();
         }
@@ -119,10 +119,10 @@ namespace Org.OpenAPITools.Model
 
             JsonTokenType startingTokenType = utf8JsonReader.TokenType;
 
-            Option<string?> type = default;
-            Option<string?> lastName = default;
-            Option<string?> firstName = default;
             Option<int?> age = default;
+            Option<string?> firstName = default;
+            Option<string?> lastName = default;
+            Option<string?> type = default;
             Option<bool?> boosterSeat = default;
 
             while (utf8JsonReader.Read())
@@ -140,18 +140,18 @@ namespace Org.OpenAPITools.Model
 
                     switch (localVarJsonPropertyName)
                     {
-                        case "$_type":
-                            type = new Option<string?>(utf8JsonReader.GetString()!);
-                            break;
-                        case "lastName":
-                            lastName = new Option<string?>(utf8JsonReader.GetString()!);
+                        case "age":
+                            if (utf8JsonReader.TokenType != JsonTokenType.Null)
+                                age = new Option<int?>(utf8JsonReader.GetInt32());
                             break;
                         case "firstName":
                             firstName = new Option<string?>(utf8JsonReader.GetString()!);
                             break;
-                        case "age":
-                            if (utf8JsonReader.TokenType != JsonTokenType.Null)
-                                age = new Option<int?>(utf8JsonReader.GetInt32());
+                        case "lastName":
+                            lastName = new Option<string?>(utf8JsonReader.GetString()!);
+                            break;
+                        case "$_type":
+                            type = new Option<string?>(utf8JsonReader.GetString()!);
                             break;
                         case "boosterSeat":
                             if (utf8JsonReader.TokenType != JsonTokenType.Null)
@@ -163,22 +163,22 @@ namespace Org.OpenAPITools.Model
                 }
             }
 
-            if (type.IsSet && type.Value == null)
-                throw new ArgumentNullException(nameof(type), "Property is not nullable for class Child.");
-
-            if (lastName.IsSet && lastName.Value == null)
-                throw new ArgumentNullException(nameof(lastName), "Property is not nullable for class Child.");
+            if (age.IsSet && age.Value == null)
+                throw new ArgumentNullException(nameof(age), "Property is not nullable for class Child.");
 
             if (firstName.IsSet && firstName.Value == null)
                 throw new ArgumentNullException(nameof(firstName), "Property is not nullable for class Child.");
 
-            if (age.IsSet && age.Value == null)
-                throw new ArgumentNullException(nameof(age), "Property is not nullable for class Child.");
+            if (lastName.IsSet && lastName.Value == null)
+                throw new ArgumentNullException(nameof(lastName), "Property is not nullable for class Child.");
+
+            if (type.IsSet && type.Value == null)
+                throw new ArgumentNullException(nameof(type), "Property is not nullable for class Child.");
 
             if (boosterSeat.IsSet && boosterSeat.Value == null)
                 throw new ArgumentNullException(nameof(boosterSeat), "Property is not nullable for class Child.");
 
-            return new Child(lastName, firstName, age, boosterSeat);
+            return new Child(age, firstName, lastName, boosterSeat);
         }
 
         /// <summary>
@@ -205,22 +205,22 @@ namespace Org.OpenAPITools.Model
         /// <exception cref="NotImplementedException"></exception>
         public void WriteProperties(Utf8JsonWriter writer, Child child, JsonSerializerOptions jsonSerializerOptions)
         {
-            if (child.LastNameOption.IsSet && child.LastName == null)
-                throw new ArgumentNullException(nameof(child.LastName), "Property is required for class Child.");
-
             if (child.FirstNameOption.IsSet && child.FirstName == null)
                 throw new ArgumentNullException(nameof(child.FirstName), "Property is required for class Child.");
 
-            writer.WriteString("$_type", child.Type);
+            if (child.LastNameOption.IsSet && child.LastName == null)
+                throw new ArgumentNullException(nameof(child.LastName), "Property is required for class Child.");
 
-            if (child.LastNameOption.IsSet)
-                writer.WriteString("lastName", child.LastName);
+            if (child.AgeOption.IsSet)
+                writer.WriteNumber("age", child.AgeOption.Value!.Value);
 
             if (child.FirstNameOption.IsSet)
                 writer.WriteString("firstName", child.FirstName);
 
-            if (child.AgeOption.IsSet)
-                writer.WriteNumber("age", child.AgeOption.Value!.Value);
+            if (child.LastNameOption.IsSet)
+                writer.WriteString("lastName", child.LastName);
+
+            writer.WriteString("$_type", child.Type);
 
             if (child.BoosterSeatOption.IsSet)
                 writer.WriteBoolean("boosterSeat", child.BoosterSeatOption.Value!.Value);

samples/client/petstore/csharp/generichost/net8/AllOf/src/Org.OpenAPITools/Model/Person.cs

@@ -34,38 +34,18 @@ namespace Org.OpenAPITools.Model
         /// <summary>
         /// Initializes a new instance of the <see cref="Person" /> class.
         /// </summary>
-        /// <param name="lastName">lastName</param>
         /// <param name="firstName">firstName</param>
+        /// <param name="lastName">lastName</param>
         [JsonConstructor]
-        public Person(Option<string?> lastName = default, Option<string?> firstName = default)
+        public Person(Option<string?> firstName = default, Option<string?> lastName = default)
         {
-            LastNameOption = lastName;
             FirstNameOption = firstName;
+            LastNameOption = lastName;
             OnCreated();
         }
 
         partial void OnCreated();
 
-        /// <summary>
-        /// The discriminator
-        /// </summary>
-        [JsonIgnore]
-        [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
-        public string Type { get; } = "Person";
-
-        /// <summary>
-        /// Used to track the state of LastName
-        /// </summary>
-        [JsonIgnore]
-        [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
-        public Option<string?> LastNameOption { get; private set; }
-
-        /// <summary>
-        /// Gets or Sets LastName
-        /// </summary>
-        [JsonPropertyName("lastName")]
-        public string? LastName { get { return this.LastNameOption; } set { this.LastNameOption = new(value); } }
-
         /// <summary>
         /// Used to track the state of FirstName
         /// </summary>
@@ -79,6 +59,26 @@ namespace Org.OpenAPITools.Model
         [JsonPropertyName("firstName")]
         public string? FirstName { get { return this.FirstNameOption; } set { this.FirstNameOption = new(value); } }
 
+        /// <summary>
+        /// Used to track the state of LastName
+        /// </summary>
+        [JsonIgnore]
+        [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
+        public Option<string?> LastNameOption { get; private set; }
+
+        /// <summary>
+        /// Gets or Sets LastName
+        /// </summary>
+        [JsonPropertyName("lastName")]
+        public string? LastName { get { return this.LastNameOption; } set { this.LastNameOption = new(value); } }
+
+        /// <summary>
+        /// The discriminator
+        /// </summary>
+        [JsonIgnore]
+        [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
+        public string Type { get; } = "Person";
+
         /// <summary>
         /// Gets or Sets additional properties
         /// </summary>
@@ -93,8 +93,8 @@ namespace Org.OpenAPITools.Model
         {
             StringBuilder sb = new StringBuilder();
             sb.Append("class Person {\n");
-            sb.Append("  LastName: ").Append(LastName).Append("\n");
             sb.Append("  FirstName: ").Append(FirstName).Append("\n");
+            sb.Append("  LastName: ").Append(LastName).Append("\n");
             sb.Append("  AdditionalProperties: ").Append(AdditionalProperties).Append("\n");
             sb.Append("}\n");
             return sb.ToString();
@@ -143,9 +143,9 @@ namespace Org.OpenAPITools.Model
 
             JsonTokenType startingTokenType = utf8JsonReader.TokenType;
 
-            Option<string?> type = default;
-            Option<string?> lastName = default;
             Option<string?> firstName = default;
+            Option<string?> lastName = default;
+            Option<string?> type = default;
 
             string? discriminator = ClientUtils.GetDiscriminator(utf8JsonReader, "$_type");
 
@@ -170,14 +170,14 @@ namespace Org.OpenAPITools.Model
 
                     switch (localVarJsonPropertyName)
                     {
-                        case "$_type":
-                            type = new Option<string?>(utf8JsonReader.GetString()!);
+                        case "firstName":
+                            firstName = new Option<string?>(utf8JsonReader.GetString()!);
                             break;
                         case "lastName":
                             lastName = new Option<string?>(utf8JsonReader.GetString()!);
                             break;
-                        case "firstName":
-                            firstName = new Option<string?>(utf8JsonReader.GetString()!);
+                        case "$_type":
+                            type = new Option<string?>(utf8JsonReader.GetString()!);
                             break;
                         default:
                             break;
@@ -185,16 +185,16 @@ namespace Org.OpenAPITools.Model
                 }
             }
 
-            if (type.IsSet && type.Value == null)
-                throw new ArgumentNullException(nameof(type), "Property is not nullable for class Person.");
+            if (firstName.IsSet && firstName.Value == null)
+                throw new ArgumentNullException(nameof(firstName), "Property is not nullable for class Person.");
 
             if (lastName.IsSet && lastName.Value == null)
                 throw new ArgumentNullException(nameof(lastName), "Property is not nullable for class Person.");
 
-            if (firstName.IsSet && firstName.Value == null)
-                throw new ArgumentNullException(nameof(firstName), "Property is not nullable for class Person.");
+            if (type.IsSet && type.Value == null)
+                throw new ArgumentNullException(nameof(type), "Property is not nullable for class Person.");
 
-            return new Person(lastName, firstName);
+            return new Person(firstName, lastName);
         }
 
         /// <summary>
@@ -231,19 +231,19 @@ namespace Org.OpenAPITools.Model
         /// <exception cref="NotImplementedException"></exception>
         public void WriteProperties(Utf8JsonWriter writer, Person person, JsonSerializerOptions jsonSerializerOptions)
         {
-            if (person.LastNameOption.IsSet && person.LastName == null)
-                throw new ArgumentNullException(nameof(person.LastName), "Property is required for class Person.");
-
             if (person.FirstNameOption.IsSet && person.FirstName == null)
                 throw new ArgumentNullException(nameof(person.FirstName), "Property is required for class Person.");
 
-            writer.WriteString("$_type", person.Type);
+            if (person.LastNameOption.IsSet && person.LastName == null)
+                throw new ArgumentNullException(nameof(person.LastName), "Property is required for class Person.");
+
+            if (person.FirstNameOption.IsSet)
+                writer.WriteString("firstName", person.FirstName);
 
             if (person.LastNameOption.IsSet)
                 writer.WriteString("lastName", person.LastName);
 
-            if (person.FirstNameOption.IsSet)
-                writer.WriteString("firstName", person.FirstName);
+            writer.WriteString("$_type", person.Type);
         }
     }
 }

samples/client/petstore/csharp/generichost/net8/FormModels/docs/apis/FakeApi.md

@@ -1067,7 +1067,7 @@ No authorization required
 
 <a id="testendpointparameters"></a>
 # **TestEndpointParameters**
-> void TestEndpointParameters (decimal number, double varDouble, string patternWithoutDelimiter, byte[] varByte, int integer = null, int int32 = null, long int64 = null, float varFloat = null, string varString = null, System.IO.Stream binary = null, DateOnly date = null, DateTime dateTime = null, string password = null, string callback = null)
+> void TestEndpointParameters (decimal number, string patternWithoutDelimiter, byte[] varByte, double varDouble, System.IO.Stream binary = null, string callback = null, DateOnly date = null, DateTime dateTime = null, int int32 = null, long int64 = null, int integer = null, string password = null, float varFloat = null, string varString = null)
 
 Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
 
@@ -1095,24 +1095,24 @@ namespace Example
 
             var apiInstance = new FakeApi(config);
             var number = 8.14D;  // decimal | None
-            var varDouble = 1.2D;  // double | None
             var patternWithoutDelimiter = "patternWithoutDelimiter_example";  // string | None
             var varByte = System.Text.Encoding.ASCII.GetBytes("BYTE_ARRAY_DATA_HERE");  // byte[] | None
-            var integer = 56;  // int | None (optional) 
-            var int32 = 56;  // int | None (optional) 
-            var int64 = 789L;  // long | None (optional) 
-            var varFloat = 3.4F;  // float | None (optional) 
-            var varString = "varString_example";  // string | None (optional) 
+            var varDouble = 1.2D;  // double | None
             var binary = new System.IO.MemoryStream(System.IO.File.ReadAllBytes("/path/to/file.txt"));  // System.IO.Stream | None (optional) 
+            var callback = "callback_example";  // string | None (optional) 
             var date = DateOnly.Parse("2013-10-20");  // DateOnly | None (optional) 
             var dateTime = DateTime.Parse(""2010-02-01T10:20:10.111110+01:00"");  // DateTime | None (optional)  (default to "2010-02-01T10:20:10.111110+01:00")
+            var int32 = 56;  // int | None (optional) 
+            var int64 = 789L;  // long | None (optional) 
+            var integer = 56;  // int | None (optional) 
             var password = "password_example";  // string | None (optional) 
-            var callback = "callback_example";  // string | None (optional) 
+            var varFloat = 3.4F;  // float | None (optional) 
+            var varString = "varString_example";  // string | None (optional) 
 
             try
             {
                 // Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
-                apiInstance.TestEndpointParameters(number, varDouble, patternWithoutDelimiter, varByte, integer, int32, int64, varFloat, varString, binary, date, dateTime, password, callback);
+                apiInstance.TestEndpointParameters(number, patternWithoutDelimiter, varByte, varDouble, binary, callback, date, dateTime, int32, int64, integer, password, varFloat, varString);
             }
             catch (ApiException  e)
             {
@@ -1132,7 +1132,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
-    apiInstance.TestEndpointParametersWithHttpInfo(number, varDouble, patternWithoutDelimiter, varByte, integer, int32, int64, varFloat, varString, binary, date, dateTime, password, callback);
+    apiInstance.TestEndpointParametersWithHttpInfo(number, patternWithoutDelimiter, varByte, varDouble, binary, callback, date, dateTime, int32, int64, integer, password, varFloat, varString);
 }
 catch (ApiException e)
 {
@@ -1147,19 +1147,19 @@ catch (ApiException e)
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
 | **number** | **decimal** | None |  |
-| **varDouble** | **double** | None |  |
 | **patternWithoutDelimiter** | **string** | None |  |
 | **varByte** | **byte[]** | None |  |
-| **integer** | **int** | None | [optional]  |
-| **int32** | **int** | None | [optional]  |
-| **int64** | **long** | None | [optional]  |
-| **varFloat** | **float** | None | [optional]  |
-| **varString** | **string** | None | [optional]  |
+| **varDouble** | **double** | None |  |
 | **binary** | **System.IO.Stream****System.IO.Stream** | None | [optional]  |
+| **callback** | **string** | None | [optional]  |
 | **date** | **DateOnly** | None | [optional]  |
 | **dateTime** | **DateTime** | None | [optional] [default to &quot;2010-02-01T10:20:10.111110+01:00&quot;] |
+| **int32** | **int** | None | [optional]  |
+| **int64** | **long** | None | [optional]  |
+| **integer** | **int** | None | [optional]  |
 | **password** | **string** | None | [optional]  |
-| **callback** | **string** | None | [optional]  |
+| **varFloat** | **float** | None | [optional]  |
+| **varString** | **string** | None | [optional]  |
 
 ### Return type
 
@@ -1185,7 +1185,7 @@ void (empty response body)
 
 <a id="testenumparameters"></a>
 # **TestEnumParameters**
-> void TestEnumParameters (List<TestEnumParametersRequestEnumFormStringArrayInner> enumHeaderStringArray = null, TestEnumParametersEnumHeaderStringParameter enumHeaderString = null, List<TestEnumParametersRequestEnumFormStringArrayInner> enumQueryStringArray = null, TestEnumParametersEnumHeaderStringParameter enumQueryString = null, TestEnumParametersEnumQueryIntegerParameter enumQueryInteger = null, TestEnumParametersEnumQueryDoubleParameter enumQueryDouble = null, List<TestEnumParametersRequestEnumFormStringArrayInner> enumFormStringArray = null, TestEnumParametersRequestEnumFormString enumFormString = null)
+> void TestEnumParameters (TestEnumParametersRequestEnumFormString enumFormString = null, List<TestEnumParametersRequestEnumFormStringArrayInner> enumFormStringArray = null, TestEnumParametersEnumHeaderStringParameter enumHeaderString = null, List<TestEnumParametersRequestEnumFormStringArrayInner> enumHeaderStringArray = null, TestEnumParametersEnumQueryDoubleParameter enumQueryDouble = null, TestEnumParametersEnumQueryIntegerParameter enumQueryInteger = null, TestEnumParametersEnumHeaderStringParameter enumQueryString = null, List<TestEnumParametersRequestEnumFormStringArrayInner> enumQueryStringArray = null)
 
 To test enum parameters
 
@@ -1208,19 +1208,19 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new FakeApi(config);
-            var enumHeaderStringArray = new List<TestEnumParametersRequestEnumFormStringArrayInner>(); // List<TestEnumParametersRequestEnumFormStringArrayInner> | Header parameter enum test (string array) (optional) 
-            var enumHeaderString = (TestEnumParametersEnumHeaderStringParameter) "_abc";  // TestEnumParametersEnumHeaderStringParameter | Header parameter enum test (string) (optional) 
-            var enumQueryStringArray = new List<TestEnumParametersRequestEnumFormStringArrayInner>(); // List<TestEnumParametersRequestEnumFormStringArrayInner> | Query parameter enum test (string array) (optional) 
-            var enumQueryString = (TestEnumParametersEnumHeaderStringParameter) "_abc";  // TestEnumParametersEnumHeaderStringParameter | Query parameter enum test (string) (optional) 
-            var enumQueryInteger = (TestEnumParametersEnumQueryIntegerParameter) "1";  // TestEnumParametersEnumQueryIntegerParameter | Query parameter enum test (double) (optional) 
-            var enumQueryDouble = (TestEnumParametersEnumQueryDoubleParameter) "1.1";  // TestEnumParametersEnumQueryDoubleParameter | Query parameter enum test (double) (optional) 
-            var enumFormStringArray = new List<TestEnumParametersRequestEnumFormStringArrayInner>(); // List<TestEnumParametersRequestEnumFormStringArrayInner> | Form parameter enum test (string array) (optional) 
             var enumFormString = (TestEnumParametersRequestEnumFormString) "_abc";  // TestEnumParametersRequestEnumFormString |  (optional) 
+            var enumFormStringArray = new List<TestEnumParametersRequestEnumFormStringArrayInner>(); // List<TestEnumParametersRequestEnumFormStringArrayInner> | Form parameter enum test (string array) (optional) 
+            var enumHeaderString = (TestEnumParametersEnumHeaderStringParameter) "_abc";  // TestEnumParametersEnumHeaderStringParameter | Header parameter enum test (string) (optional) 
+            var enumHeaderStringArray = new List<TestEnumParametersRequestEnumFormStringArrayInner>(); // List<TestEnumParametersRequestEnumFormStringArrayInner> | Header parameter enum test (string array) (optional) 
+            var enumQueryDouble = (TestEnumParametersEnumQueryDoubleParameter) "1.1";  // TestEnumParametersEnumQueryDoubleParameter | Query parameter enum test (double) (optional) 
+            var enumQueryInteger = (TestEnumParametersEnumQueryIntegerParameter) "1";  // TestEnumParametersEnumQueryIntegerParameter | Query parameter enum test (double) (optional) 
+            var enumQueryString = (TestEnumParametersEnumHeaderStringParameter) "_abc";  // TestEnumParametersEnumHeaderStringParameter | Query parameter enum test (string) (optional) 
+            var enumQueryStringArray = new List<TestEnumParametersRequestEnumFormStringArrayInner>(); // List<TestEnumParametersRequestEnumFormStringArrayInner> | Query parameter enum test (string array) (optional) 
 
             try
             {
                 // To test enum parameters
-                apiInstance.TestEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
+                apiInstance.TestEnumParameters(enumFormString, enumFormStringArray, enumHeaderString, enumHeaderStringArray, enumQueryDouble, enumQueryInteger, enumQueryString, enumQueryStringArray);
             }
             catch (ApiException  e)
             {
@@ -1240,7 +1240,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // To test enum parameters
-    apiInstance.TestEnumParametersWithHttpInfo(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
+    apiInstance.TestEnumParametersWithHttpInfo(enumFormString, enumFormStringArray, enumHeaderString, enumHeaderStringArray, enumQueryDouble, enumQueryInteger, enumQueryString, enumQueryStringArray);
 }
 catch (ApiException e)
 {
@@ -1254,14 +1254,14 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **enumHeaderStringArray** | [**List&lt;TestEnumParametersRequestEnumFormStringArrayInner&gt;**](TestEnumParametersRequestEnumFormStringArrayInner.md) | Header parameter enum test (string array) | [optional]  |
-| **enumHeaderString** | **TestEnumParametersEnumHeaderStringParameter** | Header parameter enum test (string) | [optional]  |
-| **enumQueryStringArray** | [**List&lt;TestEnumParametersRequestEnumFormStringArrayInner&gt;**](TestEnumParametersRequestEnumFormStringArrayInner.md) | Query parameter enum test (string array) | [optional]  |
-| **enumQueryString** | **TestEnumParametersEnumHeaderStringParameter** | Query parameter enum test (string) | [optional]  |
-| **enumQueryInteger** | **TestEnumParametersEnumQueryIntegerParameter** | Query parameter enum test (double) | [optional]  |
-| **enumQueryDouble** | **TestEnumParametersEnumQueryDoubleParameter** | Query parameter enum test (double) | [optional]  |
-| **enumFormStringArray** | [**List&lt;TestEnumParametersRequestEnumFormStringArrayInner&gt;**](TestEnumParametersRequestEnumFormStringArrayInner.md) | Form parameter enum test (string array) | [optional]  |
 | **enumFormString** | **TestEnumParametersRequestEnumFormString** |  | [optional]  |
+| **enumFormStringArray** | [**List&lt;TestEnumParametersRequestEnumFormStringArrayInner&gt;**](TestEnumParametersRequestEnumFormStringArrayInner.md) | Form parameter enum test (string array) | [optional]  |
+| **enumHeaderString** | **TestEnumParametersEnumHeaderStringParameter** | Header parameter enum test (string) | [optional]  |
+| **enumHeaderStringArray** | [**List&lt;TestEnumParametersRequestEnumFormStringArrayInner&gt;**](TestEnumParametersRequestEnumFormStringArrayInner.md) | Header parameter enum test (string array) | [optional]  |
+| **enumQueryDouble** | **TestEnumParametersEnumQueryDoubleParameter** | Query parameter enum test (double) | [optional]  |
+| **enumQueryInteger** | **TestEnumParametersEnumQueryIntegerParameter** | Query parameter enum test (double) | [optional]  |
+| **enumQueryString** | **TestEnumParametersEnumHeaderStringParameter** | Query parameter enum test (string) | [optional]  |
+| **enumQueryStringArray** | [**List&lt;TestEnumParametersRequestEnumFormStringArrayInner&gt;**](TestEnumParametersRequestEnumFormStringArrayInner.md) | Query parameter enum test (string array) | [optional]  |
 
 ### Return type
 
@@ -1287,7 +1287,7 @@ No authorization required
 
 <a id="testgroupparameters"></a>
 # **TestGroupParameters**
-> void TestGroupParameters (int requiredStringGroup, bool requiredBooleanGroup, long requiredInt64Group, int stringGroup = null, bool booleanGroup = null, long int64Group = null)
+> void TestGroupParameters (bool requiredBooleanGroup, long requiredInt64Group, int requiredStringGroup, bool booleanGroup = null, long int64Group = null, int stringGroup = null)
 
 Fake endpoint to test group parameters (optional)
 
@@ -1313,17 +1313,17 @@ namespace Example
             config.AccessToken = "YOUR_BEARER_TOKEN";
 
             var apiInstance = new FakeApi(config);
-            var requiredStringGroup = 56;  // int | Required String in group parameters
             var requiredBooleanGroup = true;  // bool | Required Boolean in group parameters
             var requiredInt64Group = 789L;  // long | Required Integer in group parameters
-            var stringGroup = 56;  // int | String in group parameters (optional) 
+            var requiredStringGroup = 56;  // int | Required String in group parameters
             var booleanGroup = true;  // bool | Boolean in group parameters (optional) 
             var int64Group = 789L;  // long | Integer in group parameters (optional) 
+            var stringGroup = 56;  // int | String in group parameters (optional) 
 
             try
             {
                 // Fake endpoint to test group parameters (optional)
-                apiInstance.TestGroupParameters(requiredStringGroup, requiredBooleanGroup, requiredInt64Group, stringGroup, booleanGroup, int64Group);
+                apiInstance.TestGroupParameters(requiredBooleanGroup, requiredInt64Group, requiredStringGroup, booleanGroup, int64Group, stringGroup);
             }
             catch (ApiException  e)
             {
@@ -1343,7 +1343,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Fake endpoint to test group parameters (optional)
-    apiInstance.TestGroupParametersWithHttpInfo(requiredStringGroup, requiredBooleanGroup, requiredInt64Group, stringGroup, booleanGroup, int64Group);
+    apiInstance.TestGroupParametersWithHttpInfo(requiredBooleanGroup, requiredInt64Group, requiredStringGroup, booleanGroup, int64Group, stringGroup);
 }
 catch (ApiException e)
 {
@@ -1357,12 +1357,12 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **requiredStringGroup** | **int** | Required String in group parameters |  |
 | **requiredBooleanGroup** | **bool** | Required Boolean in group parameters |  |
 | **requiredInt64Group** | **long** | Required Integer in group parameters |  |
-| **stringGroup** | **int** | String in group parameters | [optional]  |
+| **requiredStringGroup** | **int** | Required String in group parameters |  |
 | **booleanGroup** | **bool** | Boolean in group parameters | [optional]  |
 | **int64Group** | **long** | Integer in group parameters | [optional]  |
+| **stringGroup** | **int** | String in group parameters | [optional]  |
 
 ### Return type
 
@@ -1644,7 +1644,7 @@ No authorization required
 
 <a id="testqueryparametercollectionformat"></a>
 # **TestQueryParameterCollectionFormat**
-> void TestQueryParameterCollectionFormat (List<string> pipe, List<string> ioutil, List<string> http, List<string> url, List<string> context, string requiredNotNullable, string requiredNullable, string notRequiredNotNullable = null, string notRequiredNullable = null)
+> void TestQueryParameterCollectionFormat (List<string> context, List<string> http, List<string> ioutil, List<string> pipe, string requiredNotNullable, List<string> url, string notRequiredNotNullable = null, string notRequiredNullable = null, string requiredNullable)
 
 
 
@@ -1667,19 +1667,19 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new FakeApi(config);
-            var pipe = new List<string>(); // List<string> | 
-            var ioutil = new List<string>(); // List<string> | 
-            var http = new List<string>(); // List<string> | 
-            var url = new List<string>(); // List<string> | 
             var context = new List<string>(); // List<string> | 
+            var http = new List<string>(); // List<string> | 
+            var ioutil = new List<string>(); // List<string> | 
+            var pipe = new List<string>(); // List<string> | 
             var requiredNotNullable = "requiredNotNullable_example";  // string | 
-            var requiredNullable = "requiredNullable_example";  // string | 
+            var url = new List<string>(); // List<string> | 
             var notRequiredNotNullable = "notRequiredNotNullable_example";  // string |  (optional) 
             var notRequiredNullable = "notRequiredNullable_example";  // string |  (optional) 
+            var requiredNullable = "requiredNullable_example";  // string | 
 
             try
             {
-                apiInstance.TestQueryParameterCollectionFormat(pipe, ioutil, http, url, context, requiredNotNullable, requiredNullable, notRequiredNotNullable, notRequiredNullable);
+                apiInstance.TestQueryParameterCollectionFormat(context, http, ioutil, pipe, requiredNotNullable, url, notRequiredNotNullable, notRequiredNullable, requiredNullable);
             }
             catch (ApiException  e)
             {
@@ -1698,7 +1698,7 @@ This returns an ApiResponse object which contains the response data, status code
 ```csharp
 try
 {
-    apiInstance.TestQueryParameterCollectionFormatWithHttpInfo(pipe, ioutil, http, url, context, requiredNotNullable, requiredNullable, notRequiredNotNullable, notRequiredNullable);
+    apiInstance.TestQueryParameterCollectionFormatWithHttpInfo(context, http, ioutil, pipe, requiredNotNullable, url, notRequiredNotNullable, notRequiredNullable, requiredNullable);
 }
 catch (ApiException e)
 {
@@ -1712,15 +1712,15 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **pipe** | [**List&lt;string&gt;**](string.md) |  |  |
-| **ioutil** | [**List&lt;string&gt;**](string.md) |  |  |
-| **http** | [**List&lt;string&gt;**](string.md) |  |  |
-| **url** | [**List&lt;string&gt;**](string.md) |  |  |
 | **context** | [**List&lt;string&gt;**](string.md) |  |  |
+| **http** | [**List&lt;string&gt;**](string.md) |  |  |
+| **ioutil** | [**List&lt;string&gt;**](string.md) |  |  |
+| **pipe** | [**List&lt;string&gt;**](string.md) |  |  |
 | **requiredNotNullable** | **string** |  |  |
-| **requiredNullable** | **string** |  |  |
+| **url** | [**List&lt;string&gt;**](string.md) |  |  |
 | **notRequiredNotNullable** | **string** |  | [optional]  |
 | **notRequiredNullable** | **string** |  | [optional]  |
+| **requiredNullable** | **string** |  |  |
 
 ### Return type
 

samples/client/petstore/csharp/generichost/net8/FormModels/docs/apis/UserApi.md

@@ -453,7 +453,7 @@ No authorization required
 
 <a id="loginuser"></a>
 # **LoginUser**
-> string LoginUser (string username, string password)
+> string LoginUser (string password, string username)
 
 Logs user into the system
 
@@ -474,13 +474,13 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new UserApi(config);
-            var username = "username_example";  // string | The user name for login
             var password = "password_example";  // string | The password for login in clear text
+            var username = "username_example";  // string | The user name for login
 
             try
             {
                 // Logs user into the system
-                string result = apiInstance.LoginUser(username, password);
+                string result = apiInstance.LoginUser(password, username);
                 Debug.WriteLine(result);
             }
             catch (ApiException  e)
@@ -501,7 +501,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Logs user into the system
-    ApiResponse<string> response = apiInstance.LoginUserWithHttpInfo(username, password);
+    ApiResponse<string> response = apiInstance.LoginUserWithHttpInfo(password, username);
     Debug.Write("Status Code: " + response.StatusCode);
     Debug.Write("Response Headers: " + response.Headers);
     Debug.Write("Response Body: " + response.Data);
@@ -518,8 +518,8 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **username** | **string** | The user name for login |  |
 | **password** | **string** | The password for login in clear text |  |
+| **username** | **string** | The user name for login |  |
 
 ### Return type
 
@@ -625,7 +625,7 @@ No authorization required
 
 <a id="updateuser"></a>
 # **UpdateUser**
-> void UpdateUser (string username, User user)
+> void UpdateUser (User user, string username)
 
 Updated user
 
@@ -648,13 +648,13 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new UserApi(config);
-            var username = "username_example";  // string | name that need to be deleted
             var user = new User(); // User | Updated user object
+            var username = "username_example";  // string | name that need to be deleted
 
             try
             {
                 // Updated user
-                apiInstance.UpdateUser(username, user);
+                apiInstance.UpdateUser(user, username);
             }
             catch (ApiException  e)
             {
@@ -674,7 +674,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Updated user
-    apiInstance.UpdateUserWithHttpInfo(username, user);
+    apiInstance.UpdateUserWithHttpInfo(user, username);
 }
 catch (ApiException e)
 {
@@ -688,8 +688,8 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **username** | **string** | name that need to be deleted |  |
 | **user** | [**User**](User.md) | Updated user object |  |
+| **username** | **string** | name that need to be deleted |  |
 
 ### Return type
 

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools.Test/Api/FakeApiTests.cs

@@ -193,20 +193,20 @@ namespace Org.OpenAPITools.Test.Api
         public async Task TestEndpointParametersAsyncTest()
         {
             decimal number = default;
-            double varDouble = default;
             string patternWithoutDelimiter = default;
             byte[] varByte = default;
-            Client.Option<int> integer = default;
-            Client.Option<int> int32 = default;
-            Client.Option<long> int64 = default;
-            Client.Option<float> varFloat = default;
-            Client.Option<string> varString = default;
+            double varDouble = default;
             Client.Option<System.IO.Stream> binary = default;
+            Client.Option<string> callback = default;
             Client.Option<DateOnly> date = default;
             Client.Option<DateTime> dateTime = default;
+            Client.Option<int> int32 = default;
+            Client.Option<long> int64 = default;
+            Client.Option<int> integer = default;
             Client.Option<string> password = default;
-            Client.Option<string> callback = default;
-            await _instance.TestEndpointParametersAsync(number, varDouble, patternWithoutDelimiter, varByte, integer, int32, int64, varFloat, varString, binary, date, dateTime, password, callback);
+            Client.Option<float> varFloat = default;
+            Client.Option<string> varString = default;
+            await _instance.TestEndpointParametersAsync(number, patternWithoutDelimiter, varByte, varDouble, binary, callback, date, dateTime, int32, int64, integer, password, varFloat, varString);
         }
 
         /// <summary>
@@ -215,15 +215,15 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task TestEnumParametersAsyncTest()
         {
-            Client.Option<List<TestEnumParametersRequestEnumFormStringArrayInner>> enumHeaderStringArray = default;
-            Client.Option<TestEnumParametersEnumHeaderStringParameter> enumHeaderString = default;
-            Client.Option<List<TestEnumParametersRequestEnumFormStringArrayInner>> enumQueryStringArray = default;
-            Client.Option<TestEnumParametersEnumHeaderStringParameter> enumQueryString = default;
-            Client.Option<TestEnumParametersEnumQueryIntegerParameter> enumQueryInteger = default;
-            Client.Option<TestEnumParametersEnumQueryDoubleParameter> enumQueryDouble = default;
-            Client.Option<List<TestEnumParametersRequestEnumFormStringArrayInner>> enumFormStringArray = default;
             Client.Option<TestEnumParametersRequestEnumFormString> enumFormString = default;
-            await _instance.TestEnumParametersAsync(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
+            Client.Option<List<TestEnumParametersRequestEnumFormStringArrayInner>> enumFormStringArray = default;
+            Client.Option<TestEnumParametersEnumHeaderStringParameter> enumHeaderString = default;
+            Client.Option<List<TestEnumParametersRequestEnumFormStringArrayInner>> enumHeaderStringArray = default;
+            Client.Option<TestEnumParametersEnumQueryDoubleParameter> enumQueryDouble = default;
+            Client.Option<TestEnumParametersEnumQueryIntegerParameter> enumQueryInteger = default;
+            Client.Option<TestEnumParametersEnumHeaderStringParameter> enumQueryString = default;
+            Client.Option<List<TestEnumParametersRequestEnumFormStringArrayInner>> enumQueryStringArray = default;
+            await _instance.TestEnumParametersAsync(enumFormString, enumFormStringArray, enumHeaderString, enumHeaderStringArray, enumQueryDouble, enumQueryInteger, enumQueryString, enumQueryStringArray);
         }
 
         /// <summary>
@@ -232,13 +232,13 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task TestGroupParametersAsyncTest()
         {
-            int requiredStringGroup = default;
             bool requiredBooleanGroup = default;
             long requiredInt64Group = default;
-            Client.Option<int> stringGroup = default;
+            int requiredStringGroup = default;
             Client.Option<bool> booleanGroup = default;
             Client.Option<long> int64Group = default;
-            await _instance.TestGroupParametersAsync(requiredStringGroup, requiredBooleanGroup, requiredInt64Group, stringGroup, booleanGroup, int64Group);
+            Client.Option<int> stringGroup = default;
+            await _instance.TestGroupParametersAsync(requiredBooleanGroup, requiredInt64Group, requiredStringGroup, booleanGroup, int64Group, stringGroup);
         }
 
         /// <summary>
@@ -278,16 +278,16 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task TestQueryParameterCollectionFormatAsyncTest()
         {
-            List<string> pipe = default;
-            List<string> ioutil = default;
-            List<string> http = default;
-            List<string> url = default;
             List<string> context = default;
+            List<string> http = default;
+            List<string> ioutil = default;
+            List<string> pipe = default;
             string requiredNotNullable = default;
-            string requiredNullable = default;
+            List<string> url = default;
             Client.Option<string> notRequiredNotNullable = default;
             Client.Option<string> notRequiredNullable = default;
-            await _instance.TestQueryParameterCollectionFormatAsync(pipe, ioutil, http, url, context, requiredNotNullable, requiredNullable, notRequiredNotNullable, notRequiredNullable);
+            string requiredNullable = default;
+            await _instance.TestQueryParameterCollectionFormatAsync(context, http, ioutil, pipe, requiredNotNullable, url, notRequiredNotNullable, notRequiredNullable, requiredNullable);
         }
 
         /// <summary>

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools.Test/Api/UserApiTests.cs

@@ -108,9 +108,9 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task LoginUserAsyncTest()
         {
-            string username = default;
             string password = default;
-            var response = await _instance.LoginUserAsync(username, password);
+            string username = default;
+            var response = await _instance.LoginUserAsync(password, username);
             var model = response.Ok();
             Assert.IsType<string>(model);
         }
@@ -130,9 +130,9 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task UpdateUserAsyncTest()
         {
-            string username = default;
             User user = default;
-            await _instance.UpdateUserAsync(username, user);
+            string username = default;
+            await _instance.UpdateUserAsync(user, username);
         }
     }
 }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Api/UserApi.cs

@@ -156,11 +156,11 @@ namespace Org.OpenAPITools.Api
         /// 
         /// </remarks>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        Task<ILoginUserApiResponse> LoginUserAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default);
+        Task<ILoginUserApiResponse> LoginUserAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Logs user into the system
@@ -168,11 +168,11 @@ namespace Org.OpenAPITools.Api
         /// <remarks>
         /// 
         /// </remarks>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        Task<ILoginUserApiResponse> LoginUserOrDefaultAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default);
+        Task<ILoginUserApiResponse> LoginUserOrDefaultAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Logs out current logged in user session
@@ -202,11 +202,11 @@ namespace Org.OpenAPITools.Api
         /// This can only be done by the logged in user.
         /// </remarks>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        Task<IUpdateUserApiResponse> UpdateUserAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default);
+        Task<IUpdateUserApiResponse> UpdateUserAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Updated user
@@ -214,11 +214,11 @@ namespace Org.OpenAPITools.Api
         /// <remarks>
         /// This can only be done by the logged in user.
         /// </remarks>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        Task<IUpdateUserApiResponse> UpdateUserOrDefaultAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default);
+        Task<IUpdateUserApiResponse> UpdateUserOrDefaultAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default);
     }
 
     /// <summary>
@@ -1632,33 +1632,33 @@ namespace Org.OpenAPITools.Api
             partial void OnDeserializationError(ref bool suppressDefaultLog, Exception exception, HttpStatusCode httpStatusCode);
         }
 
-        partial void FormatLoginUser(ref string username, ref string password);
+        partial void FormatLoginUser(ref string password, ref string username);
 
         /// <summary>
         /// Validates the request parameters
         /// </summary>
-        /// <param name="username"></param>
         /// <param name="password"></param>
+        /// <param name="username"></param>
         /// <returns></returns>
-        private void ValidateLoginUser(string username, string password)
+        private void ValidateLoginUser(string password, string username)
         {
-            if (username == null)
-                throw new ArgumentNullException(nameof(username));
-
             if (password == null)
                 throw new ArgumentNullException(nameof(password));
+
+            if (username == null)
+                throw new ArgumentNullException(nameof(username));
         }
 
         /// <summary>
         /// Processes the server response
         /// </summary>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        private void AfterLoginUserDefaultImplementation(ILoginUserApiResponse apiResponseLocalVar, string username, string password)
+        /// <param name="username"></param>
+        private void AfterLoginUserDefaultImplementation(ILoginUserApiResponse apiResponseLocalVar, string password, string username)
         {
             bool suppressDefaultLog = false;
-            AfterLoginUser(ref suppressDefaultLog, apiResponseLocalVar, username, password);
+            AfterLoginUser(ref suppressDefaultLog, apiResponseLocalVar, password, username);
             if (!suppressDefaultLog)
                 Logger.LogInformation("{0,-9} | {1} | {3}", (apiResponseLocalVar.DownloadedAt - apiResponseLocalVar.RequestedAt).TotalSeconds, apiResponseLocalVar.StatusCode, apiResponseLocalVar.Path);
         }
@@ -1668,9 +1668,9 @@ namespace Org.OpenAPITools.Api
         /// </summary>
         /// <param name="suppressDefaultLog"></param>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        partial void AfterLoginUser(ref bool suppressDefaultLog, ILoginUserApiResponse apiResponseLocalVar, string username, string password);
+        /// <param name="username"></param>
+        partial void AfterLoginUser(ref bool suppressDefaultLog, ILoginUserApiResponse apiResponseLocalVar, string password, string username);
 
         /// <summary>
         /// Logs exceptions that occur while retrieving the server response
@@ -1678,12 +1678,12 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        private void OnErrorLoginUserDefaultImplementation(Exception exception, string pathFormat, string path, string username, string password)
+        /// <param name="username"></param>
+        private void OnErrorLoginUserDefaultImplementation(Exception exception, string pathFormat, string path, string password, string username)
         {
             bool suppressDefaultLog = false;
-            OnErrorLoginUser(ref suppressDefaultLog, exception, pathFormat, path, username, password);
+            OnErrorLoginUser(ref suppressDefaultLog, exception, pathFormat, path, password, username);
             if (!suppressDefaultLog)
                 Logger.LogError(exception, "An error occurred while sending the request to the server.");
         }
@@ -1695,22 +1695,22 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        partial void OnErrorLoginUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, string username, string password);
+        /// <param name="username"></param>
+        partial void OnErrorLoginUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, string password, string username);
 
         /// <summary>
         /// Logs user into the system 
         /// </summary>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        public async Task<ILoginUserApiResponse> LoginUserOrDefaultAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<ILoginUserApiResponse> LoginUserOrDefaultAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             try
             {
-                return await LoginUserAsync(username, password, cancellationToken).ConfigureAwait(false);
+                return await LoginUserAsync(password, username, cancellationToken).ConfigureAwait(false);
             }
             catch (Exception)
             {
@@ -1722,19 +1722,19 @@ namespace Org.OpenAPITools.Api
         /// Logs user into the system 
         /// </summary>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        public async Task<ILoginUserApiResponse> LoginUserAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<ILoginUserApiResponse> LoginUserAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             UriBuilder uriBuilderLocalVar = new UriBuilder();
 
             try
             {
-                ValidateLoginUser(username, password);
+                ValidateLoginUser(password, username);
 
-                FormatLoginUser(ref username, ref password);
+                FormatLoginUser(ref password, ref username);
 
                 using (HttpRequestMessage httpRequestMessageLocalVar = new HttpRequestMessage())
                 {
@@ -1745,8 +1745,8 @@ namespace Org.OpenAPITools.Api
 
                     System.Collections.Specialized.NameValueCollection parseQueryStringLocalVar = System.Web.HttpUtility.ParseQueryString(string.Empty);
 
-                    parseQueryStringLocalVar["username"] = ClientUtils.ParameterToString(username);
                     parseQueryStringLocalVar["password"] = ClientUtils.ParameterToString(password);
+                    parseQueryStringLocalVar["username"] = ClientUtils.ParameterToString(username);
 
                     uriBuilderLocalVar.Query = parseQueryStringLocalVar.ToString();
 
@@ -1774,7 +1774,7 @@ namespace Org.OpenAPITools.Api
 
                         LoginUserApiResponse apiResponseLocalVar = new(apiResponseLoggerLocalVar, httpRequestMessageLocalVar, httpResponseMessageLocalVar, responseContentLocalVar, "/user/login", requestedAtLocalVar, _jsonSerializerOptions);
 
-                        AfterLoginUserDefaultImplementation(apiResponseLocalVar, username, password);
+                        AfterLoginUserDefaultImplementation(apiResponseLocalVar, password, username);
 
                         Events.ExecuteOnLoginUser(apiResponseLocalVar);
 
@@ -1811,7 +1811,7 @@ namespace Org.OpenAPITools.Api
             }
             catch(Exception e)
             {
-                OnErrorLoginUserDefaultImplementation(e, "/user/login", uriBuilderLocalVar.Path, username, password);
+                OnErrorLoginUserDefaultImplementation(e, "/user/login", uriBuilderLocalVar.Path, password, username);
                 Events.ExecuteOnErrorLoginUser(e);
                 throw;
             }
@@ -2053,33 +2053,33 @@ namespace Org.OpenAPITools.Api
             partial void OnDeserializationError(ref bool suppressDefaultLog, Exception exception, HttpStatusCode httpStatusCode);
         }
 
-        partial void FormatUpdateUser(ref string username, User user);
+        partial void FormatUpdateUser(User user, ref string username);
 
         /// <summary>
         /// Validates the request parameters
         /// </summary>
-        /// <param name="username"></param>
         /// <param name="user"></param>
+        /// <param name="username"></param>
         /// <returns></returns>
-        private void ValidateUpdateUser(string username, User user)
+        private void ValidateUpdateUser(User user, string username)
         {
-            if (username == null)
-                throw new ArgumentNullException(nameof(username));
-
             if (user == null)
                 throw new ArgumentNullException(nameof(user));
+
+            if (username == null)
+                throw new ArgumentNullException(nameof(username));
         }
 
         /// <summary>
         /// Processes the server response
         /// </summary>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        private void AfterUpdateUserDefaultImplementation(IUpdateUserApiResponse apiResponseLocalVar, string username, User user)
+        /// <param name="username"></param>
+        private void AfterUpdateUserDefaultImplementation(IUpdateUserApiResponse apiResponseLocalVar, User user, string username)
         {
             bool suppressDefaultLog = false;
-            AfterUpdateUser(ref suppressDefaultLog, apiResponseLocalVar, username, user);
+            AfterUpdateUser(ref suppressDefaultLog, apiResponseLocalVar, user, username);
             if (!suppressDefaultLog)
                 Logger.LogInformation("{0,-9} | {1} | {3}", (apiResponseLocalVar.DownloadedAt - apiResponseLocalVar.RequestedAt).TotalSeconds, apiResponseLocalVar.StatusCode, apiResponseLocalVar.Path);
         }
@@ -2089,9 +2089,9 @@ namespace Org.OpenAPITools.Api
         /// </summary>
         /// <param name="suppressDefaultLog"></param>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        partial void AfterUpdateUser(ref bool suppressDefaultLog, IUpdateUserApiResponse apiResponseLocalVar, string username, User user);
+        /// <param name="username"></param>
+        partial void AfterUpdateUser(ref bool suppressDefaultLog, IUpdateUserApiResponse apiResponseLocalVar, User user, string username);
 
         /// <summary>
         /// Logs exceptions that occur while retrieving the server response
@@ -2099,12 +2099,12 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        private void OnErrorUpdateUserDefaultImplementation(Exception exception, string pathFormat, string path, string username, User user)
+        /// <param name="username"></param>
+        private void OnErrorUpdateUserDefaultImplementation(Exception exception, string pathFormat, string path, User user, string username)
         {
             bool suppressDefaultLog = false;
-            OnErrorUpdateUser(ref suppressDefaultLog, exception, pathFormat, path, username, user);
+            OnErrorUpdateUser(ref suppressDefaultLog, exception, pathFormat, path, user, username);
             if (!suppressDefaultLog)
                 Logger.LogError(exception, "An error occurred while sending the request to the server.");
         }
@@ -2116,22 +2116,22 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        partial void OnErrorUpdateUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, string username, User user);
+        /// <param name="username"></param>
+        partial void OnErrorUpdateUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, User user, string username);
 
         /// <summary>
         /// Updated user This can only be done by the logged in user.
         /// </summary>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        public async Task<IUpdateUserApiResponse> UpdateUserOrDefaultAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<IUpdateUserApiResponse> UpdateUserOrDefaultAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             try
             {
-                return await UpdateUserAsync(username, user, cancellationToken).ConfigureAwait(false);
+                return await UpdateUserAsync(user, username, cancellationToken).ConfigureAwait(false);
             }
             catch (Exception)
             {
@@ -2143,19 +2143,19 @@ namespace Org.OpenAPITools.Api
         /// Updated user This can only be done by the logged in user.
         /// </summary>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        public async Task<IUpdateUserApiResponse> UpdateUserAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<IUpdateUserApiResponse> UpdateUserAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             UriBuilder uriBuilderLocalVar = new UriBuilder();
 
             try
             {
-                ValidateUpdateUser(username, user);
+                ValidateUpdateUser(user, username);
 
-                FormatUpdateUser(ref username, user);
+                FormatUpdateUser(user, ref username);
 
                 using (HttpRequestMessage httpRequestMessageLocalVar = new HttpRequestMessage())
                 {
@@ -2192,7 +2192,7 @@ namespace Org.OpenAPITools.Api
 
                         UpdateUserApiResponse apiResponseLocalVar = new(apiResponseLoggerLocalVar, httpRequestMessageLocalVar, httpResponseMessageLocalVar, responseContentLocalVar, "/user/{username}", requestedAtLocalVar, _jsonSerializerOptions);
 
-                        AfterUpdateUserDefaultImplementation(apiResponseLocalVar, username, user);
+                        AfterUpdateUserDefaultImplementation(apiResponseLocalVar, user, username);
 
                         Events.ExecuteOnUpdateUser(apiResponseLocalVar);
 
@@ -2202,7 +2202,7 @@ namespace Org.OpenAPITools.Api
             }
             catch(Exception e)
             {
-                OnErrorUpdateUserDefaultImplementation(e, "/user/{username}", uriBuilderLocalVar.Path, username, user);
+                OnErrorUpdateUserDefaultImplementation(e, "/user/{username}", uriBuilderLocalVar.Path, user, username);
                 Events.ExecuteOnErrorUpdateUser(e);
                 throw;
             }

samples/client/petstore/csharp/generichost/net8/NullReferenceTypes/docs/apis/FakeApi.md

@@ -1067,7 +1067,7 @@ No authorization required
 
 <a id="testendpointparameters"></a>
 # **TestEndpointParameters**
-> void TestEndpointParameters (decimal number, double varDouble, string patternWithoutDelimiter, byte[] varByte, int integer = null, int int32 = null, long int64 = null, float varFloat = null, string varString = null, System.IO.Stream binary = null, DateOnly date = null, DateTime dateTime = null, string password = null, string callback = null)
+> void TestEndpointParameters (decimal number, string patternWithoutDelimiter, byte[] varByte, double varDouble, System.IO.Stream binary = null, string callback = null, DateOnly date = null, DateTime dateTime = null, int int32 = null, long int64 = null, int integer = null, string password = null, float varFloat = null, string varString = null)
 
 Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
 
@@ -1095,24 +1095,24 @@ namespace Example
 
             var apiInstance = new FakeApi(config);
             var number = 8.14D;  // decimal | None
-            var varDouble = 1.2D;  // double | None
             var patternWithoutDelimiter = "patternWithoutDelimiter_example";  // string | None
             var varByte = System.Text.Encoding.ASCII.GetBytes("BYTE_ARRAY_DATA_HERE");  // byte[] | None
-            var integer = 56;  // int | None (optional) 
-            var int32 = 56;  // int | None (optional) 
-            var int64 = 789L;  // long | None (optional) 
-            var varFloat = 3.4F;  // float | None (optional) 
-            var varString = "varString_example";  // string | None (optional) 
+            var varDouble = 1.2D;  // double | None
             var binary = new System.IO.MemoryStream(System.IO.File.ReadAllBytes("/path/to/file.txt"));  // System.IO.Stream | None (optional) 
+            var callback = "callback_example";  // string | None (optional) 
             var date = DateOnly.Parse("2013-10-20");  // DateOnly | None (optional) 
             var dateTime = DateTime.Parse(""2010-02-01T10:20:10.111110+01:00"");  // DateTime | None (optional)  (default to "2010-02-01T10:20:10.111110+01:00")
+            var int32 = 56;  // int | None (optional) 
+            var int64 = 789L;  // long | None (optional) 
+            var integer = 56;  // int | None (optional) 
             var password = "password_example";  // string | None (optional) 
-            var callback = "callback_example";  // string | None (optional) 
+            var varFloat = 3.4F;  // float | None (optional) 
+            var varString = "varString_example";  // string | None (optional) 
 
             try
             {
                 // Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
-                apiInstance.TestEndpointParameters(number, varDouble, patternWithoutDelimiter, varByte, integer, int32, int64, varFloat, varString, binary, date, dateTime, password, callback);
+                apiInstance.TestEndpointParameters(number, patternWithoutDelimiter, varByte, varDouble, binary, callback, date, dateTime, int32, int64, integer, password, varFloat, varString);
             }
             catch (ApiException  e)
             {
@@ -1132,7 +1132,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
-    apiInstance.TestEndpointParametersWithHttpInfo(number, varDouble, patternWithoutDelimiter, varByte, integer, int32, int64, varFloat, varString, binary, date, dateTime, password, callback);
+    apiInstance.TestEndpointParametersWithHttpInfo(number, patternWithoutDelimiter, varByte, varDouble, binary, callback, date, dateTime, int32, int64, integer, password, varFloat, varString);
 }
 catch (ApiException e)
 {
@@ -1147,19 +1147,19 @@ catch (ApiException e)
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
 | **number** | **decimal** | None |  |
-| **varDouble** | **double** | None |  |
 | **patternWithoutDelimiter** | **string** | None |  |
 | **varByte** | **byte[]** | None |  |
-| **integer** | **int** | None | [optional]  |
-| **int32** | **int** | None | [optional]  |
-| **int64** | **long** | None | [optional]  |
-| **varFloat** | **float** | None | [optional]  |
-| **varString** | **string** | None | [optional]  |
+| **varDouble** | **double** | None |  |
 | **binary** | **System.IO.Stream****System.IO.Stream** | None | [optional]  |
+| **callback** | **string** | None | [optional]  |
 | **date** | **DateOnly** | None | [optional]  |
 | **dateTime** | **DateTime** | None | [optional] [default to &quot;2010-02-01T10:20:10.111110+01:00&quot;] |
+| **int32** | **int** | None | [optional]  |
+| **int64** | **long** | None | [optional]  |
+| **integer** | **int** | None | [optional]  |
 | **password** | **string** | None | [optional]  |
-| **callback** | **string** | None | [optional]  |
+| **varFloat** | **float** | None | [optional]  |
+| **varString** | **string** | None | [optional]  |
 
 ### Return type
 
@@ -1185,7 +1185,7 @@ void (empty response body)
 
 <a id="testenumparameters"></a>
 # **TestEnumParameters**
-> void TestEnumParameters (List<string> enumHeaderStringArray = null, string enumHeaderString = null, List<string> enumQueryStringArray = null, string enumQueryString = null, int enumQueryInteger = null, double enumQueryDouble = null, List<string> enumFormStringArray = null, string enumFormString = null)
+> void TestEnumParameters (string enumFormString = null, List<string> enumFormStringArray = null, string enumHeaderString = null, List<string> enumHeaderStringArray = null, double enumQueryDouble = null, int enumQueryInteger = null, string enumQueryString = null, List<string> enumQueryStringArray = null)
 
 To test enum parameters
 
@@ -1208,19 +1208,19 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new FakeApi(config);
-            var enumHeaderStringArray = new List<string>(); // List<string> | Header parameter enum test (string array) (optional) 
-            var enumHeaderString = "_abc";  // string | Header parameter enum test (string) (optional)  (default to -efg)
-            var enumQueryStringArray = new List<string>(); // List<string> | Query parameter enum test (string array) (optional) 
-            var enumQueryString = "_abc";  // string | Query parameter enum test (string) (optional)  (default to -efg)
-            var enumQueryInteger = 1;  // int | Query parameter enum test (double) (optional) 
-            var enumQueryDouble = 1.1D;  // double | Query parameter enum test (double) (optional) 
-            var enumFormStringArray = new List<string>(); // List<string> | Form parameter enum test (string array) (optional)  (default to $)
             var enumFormString = "_abc";  // string | Form parameter enum test (string) (optional)  (default to -efg)
+            var enumFormStringArray = new List<string>(); // List<string> | Form parameter enum test (string array) (optional)  (default to $)
+            var enumHeaderString = "_abc";  // string | Header parameter enum test (string) (optional)  (default to -efg)
+            var enumHeaderStringArray = new List<string>(); // List<string> | Header parameter enum test (string array) (optional) 
+            var enumQueryDouble = 1.1D;  // double | Query parameter enum test (double) (optional) 
+            var enumQueryInteger = 1;  // int | Query parameter enum test (double) (optional) 
+            var enumQueryString = "_abc";  // string | Query parameter enum test (string) (optional)  (default to -efg)
+            var enumQueryStringArray = new List<string>(); // List<string> | Query parameter enum test (string array) (optional) 
 
             try
             {
                 // To test enum parameters
-                apiInstance.TestEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
+                apiInstance.TestEnumParameters(enumFormString, enumFormStringArray, enumHeaderString, enumHeaderStringArray, enumQueryDouble, enumQueryInteger, enumQueryString, enumQueryStringArray);
             }
             catch (ApiException  e)
             {
@@ -1240,7 +1240,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // To test enum parameters
-    apiInstance.TestEnumParametersWithHttpInfo(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
+    apiInstance.TestEnumParametersWithHttpInfo(enumFormString, enumFormStringArray, enumHeaderString, enumHeaderStringArray, enumQueryDouble, enumQueryInteger, enumQueryString, enumQueryStringArray);
 }
 catch (ApiException e)
 {
@@ -1254,14 +1254,14 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **enumHeaderStringArray** | [**List&lt;string&gt;**](string.md) | Header parameter enum test (string array) | [optional]  |
-| **enumHeaderString** | **string** | Header parameter enum test (string) | [optional] [default to -efg] |
-| **enumQueryStringArray** | [**List&lt;string&gt;**](string.md) | Query parameter enum test (string array) | [optional]  |
-| **enumQueryString** | **string** | Query parameter enum test (string) | [optional] [default to -efg] |
-| **enumQueryInteger** | **int** | Query parameter enum test (double) | [optional]  |
-| **enumQueryDouble** | **double** | Query parameter enum test (double) | [optional]  |
-| **enumFormStringArray** | [**List&lt;string&gt;**](string.md) | Form parameter enum test (string array) | [optional] [default to $] |
 | **enumFormString** | **string** | Form parameter enum test (string) | [optional] [default to -efg] |
+| **enumFormStringArray** | [**List&lt;string&gt;**](string.md) | Form parameter enum test (string array) | [optional] [default to $] |
+| **enumHeaderString** | **string** | Header parameter enum test (string) | [optional] [default to -efg] |
+| **enumHeaderStringArray** | [**List&lt;string&gt;**](string.md) | Header parameter enum test (string array) | [optional]  |
+| **enumQueryDouble** | **double** | Query parameter enum test (double) | [optional]  |
+| **enumQueryInteger** | **int** | Query parameter enum test (double) | [optional]  |
+| **enumQueryString** | **string** | Query parameter enum test (string) | [optional] [default to -efg] |
+| **enumQueryStringArray** | [**List&lt;string&gt;**](string.md) | Query parameter enum test (string array) | [optional]  |
 
 ### Return type
 
@@ -1287,7 +1287,7 @@ No authorization required
 
 <a id="testgroupparameters"></a>
 # **TestGroupParameters**
-> void TestGroupParameters (int requiredStringGroup, bool requiredBooleanGroup, long requiredInt64Group, int stringGroup = null, bool booleanGroup = null, long int64Group = null)
+> void TestGroupParameters (bool requiredBooleanGroup, long requiredInt64Group, int requiredStringGroup, bool booleanGroup = null, long int64Group = null, int stringGroup = null)
 
 Fake endpoint to test group parameters (optional)
 
@@ -1313,17 +1313,17 @@ namespace Example
             config.AccessToken = "YOUR_BEARER_TOKEN";
 
             var apiInstance = new FakeApi(config);
-            var requiredStringGroup = 56;  // int | Required String in group parameters
             var requiredBooleanGroup = true;  // bool | Required Boolean in group parameters
             var requiredInt64Group = 789L;  // long | Required Integer in group parameters
-            var stringGroup = 56;  // int | String in group parameters (optional) 
+            var requiredStringGroup = 56;  // int | Required String in group parameters
             var booleanGroup = true;  // bool | Boolean in group parameters (optional) 
             var int64Group = 789L;  // long | Integer in group parameters (optional) 
+            var stringGroup = 56;  // int | String in group parameters (optional) 
 
             try
             {
                 // Fake endpoint to test group parameters (optional)
-                apiInstance.TestGroupParameters(requiredStringGroup, requiredBooleanGroup, requiredInt64Group, stringGroup, booleanGroup, int64Group);
+                apiInstance.TestGroupParameters(requiredBooleanGroup, requiredInt64Group, requiredStringGroup, booleanGroup, int64Group, stringGroup);
             }
             catch (ApiException  e)
             {
@@ -1343,7 +1343,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Fake endpoint to test group parameters (optional)
-    apiInstance.TestGroupParametersWithHttpInfo(requiredStringGroup, requiredBooleanGroup, requiredInt64Group, stringGroup, booleanGroup, int64Group);
+    apiInstance.TestGroupParametersWithHttpInfo(requiredBooleanGroup, requiredInt64Group, requiredStringGroup, booleanGroup, int64Group, stringGroup);
 }
 catch (ApiException e)
 {
@@ -1357,12 +1357,12 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **requiredStringGroup** | **int** | Required String in group parameters |  |
 | **requiredBooleanGroup** | **bool** | Required Boolean in group parameters |  |
 | **requiredInt64Group** | **long** | Required Integer in group parameters |  |
-| **stringGroup** | **int** | String in group parameters | [optional]  |
+| **requiredStringGroup** | **int** | Required String in group parameters |  |
 | **booleanGroup** | **bool** | Boolean in group parameters | [optional]  |
 | **int64Group** | **long** | Integer in group parameters | [optional]  |
+| **stringGroup** | **int** | String in group parameters | [optional]  |
 
 ### Return type
 
@@ -1644,7 +1644,7 @@ No authorization required
 
 <a id="testqueryparametercollectionformat"></a>
 # **TestQueryParameterCollectionFormat**
-> void TestQueryParameterCollectionFormat (List<string> pipe, List<string> ioutil, List<string> http, List<string> url, List<string> context, string requiredNotNullable, string requiredNullable, string notRequiredNotNullable = null, string notRequiredNullable = null)
+> void TestQueryParameterCollectionFormat (List<string> context, List<string> http, List<string> ioutil, List<string> pipe, string requiredNotNullable, List<string> url, string notRequiredNotNullable = null, string notRequiredNullable = null, string requiredNullable)
 
 
 
@@ -1667,19 +1667,19 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new FakeApi(config);
-            var pipe = new List<string>(); // List<string> | 
-            var ioutil = new List<string>(); // List<string> | 
-            var http = new List<string>(); // List<string> | 
-            var url = new List<string>(); // List<string> | 
             var context = new List<string>(); // List<string> | 
+            var http = new List<string>(); // List<string> | 
+            var ioutil = new List<string>(); // List<string> | 
+            var pipe = new List<string>(); // List<string> | 
             var requiredNotNullable = "requiredNotNullable_example";  // string | 
-            var requiredNullable = "requiredNullable_example";  // string | 
+            var url = new List<string>(); // List<string> | 
             var notRequiredNotNullable = "notRequiredNotNullable_example";  // string |  (optional) 
             var notRequiredNullable = "notRequiredNullable_example";  // string |  (optional) 
+            var requiredNullable = "requiredNullable_example";  // string | 
 
             try
             {
-                apiInstance.TestQueryParameterCollectionFormat(pipe, ioutil, http, url, context, requiredNotNullable, requiredNullable, notRequiredNotNullable, notRequiredNullable);
+                apiInstance.TestQueryParameterCollectionFormat(context, http, ioutil, pipe, requiredNotNullable, url, notRequiredNotNullable, notRequiredNullable, requiredNullable);
             }
             catch (ApiException  e)
             {
@@ -1698,7 +1698,7 @@ This returns an ApiResponse object which contains the response data, status code
 ```csharp
 try
 {
-    apiInstance.TestQueryParameterCollectionFormatWithHttpInfo(pipe, ioutil, http, url, context, requiredNotNullable, requiredNullable, notRequiredNotNullable, notRequiredNullable);
+    apiInstance.TestQueryParameterCollectionFormatWithHttpInfo(context, http, ioutil, pipe, requiredNotNullable, url, notRequiredNotNullable, notRequiredNullable, requiredNullable);
 }
 catch (ApiException e)
 {
@@ -1712,15 +1712,15 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **pipe** | [**List&lt;string&gt;**](string.md) |  |  |
-| **ioutil** | [**List&lt;string&gt;**](string.md) |  |  |
-| **http** | [**List&lt;string&gt;**](string.md) |  |  |
-| **url** | [**List&lt;string&gt;**](string.md) |  |  |
 | **context** | [**List&lt;string&gt;**](string.md) |  |  |
+| **http** | [**List&lt;string&gt;**](string.md) |  |  |
+| **ioutil** | [**List&lt;string&gt;**](string.md) |  |  |
+| **pipe** | [**List&lt;string&gt;**](string.md) |  |  |
 | **requiredNotNullable** | **string** |  |  |
-| **requiredNullable** | **string** |  |  |
+| **url** | [**List&lt;string&gt;**](string.md) |  |  |
 | **notRequiredNotNullable** | **string** |  | [optional]  |
 | **notRequiredNullable** | **string** |  | [optional]  |
+| **requiredNullable** | **string** |  |  |
 
 ### Return type
 

samples/client/petstore/csharp/generichost/net8/NullReferenceTypes/docs/apis/UserApi.md

@@ -453,7 +453,7 @@ No authorization required
 
 <a id="loginuser"></a>
 # **LoginUser**
-> string LoginUser (string username, string password)
+> string LoginUser (string password, string username)
 
 Logs user into the system
 
@@ -474,13 +474,13 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new UserApi(config);
-            var username = "username_example";  // string | The user name for login
             var password = "password_example";  // string | The password for login in clear text
+            var username = "username_example";  // string | The user name for login
 
             try
             {
                 // Logs user into the system
-                string result = apiInstance.LoginUser(username, password);
+                string result = apiInstance.LoginUser(password, username);
                 Debug.WriteLine(result);
             }
             catch (ApiException  e)
@@ -501,7 +501,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Logs user into the system
-    ApiResponse<string> response = apiInstance.LoginUserWithHttpInfo(username, password);
+    ApiResponse<string> response = apiInstance.LoginUserWithHttpInfo(password, username);
     Debug.Write("Status Code: " + response.StatusCode);
     Debug.Write("Response Headers: " + response.Headers);
     Debug.Write("Response Body: " + response.Data);
@@ -518,8 +518,8 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **username** | **string** | The user name for login |  |
 | **password** | **string** | The password for login in clear text |  |
+| **username** | **string** | The user name for login |  |
 
 ### Return type
 
@@ -625,7 +625,7 @@ No authorization required
 
 <a id="updateuser"></a>
 # **UpdateUser**
-> void UpdateUser (string username, User user)
+> void UpdateUser (User user, string username)
 
 Updated user
 
@@ -648,13 +648,13 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new UserApi(config);
-            var username = "username_example";  // string | name that need to be deleted
             var user = new User(); // User | Updated user object
+            var username = "username_example";  // string | name that need to be deleted
 
             try
             {
                 // Updated user
-                apiInstance.UpdateUser(username, user);
+                apiInstance.UpdateUser(user, username);
             }
             catch (ApiException  e)
             {
@@ -674,7 +674,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Updated user
-    apiInstance.UpdateUserWithHttpInfo(username, user);
+    apiInstance.UpdateUserWithHttpInfo(user, username);
 }
 catch (ApiException e)
 {
@@ -688,8 +688,8 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **username** | **string** | name that need to be deleted |  |
 | **user** | [**User**](User.md) | Updated user object |  |
+| **username** | **string** | name that need to be deleted |  |
 
 ### Return type
 

samples/client/petstore/csharp/generichost/net8/NullReferenceTypes/src/Org.OpenAPITools.Test/Api/FakeApiTests.cs

@@ -193,20 +193,20 @@ namespace Org.OpenAPITools.Test.Api
         public async Task TestEndpointParametersAsyncTest()
         {
             decimal number = default!;
-            double varDouble = default!;
             string patternWithoutDelimiter = default!;
             byte[] varByte = default!;
-            Client.Option<int> integer = default!;
-            Client.Option<int> int32 = default!;
-            Client.Option<long> int64 = default!;
-            Client.Option<float> varFloat = default!;
-            Client.Option<string> varString = default!;
+            double varDouble = default!;
             Client.Option<System.IO.Stream> binary = default!;
+            Client.Option<string> callback = default!;
             Client.Option<DateOnly> date = default!;
             Client.Option<DateTime> dateTime = default!;
+            Client.Option<int> int32 = default!;
+            Client.Option<long> int64 = default!;
+            Client.Option<int> integer = default!;
             Client.Option<string> password = default!;
-            Client.Option<string> callback = default!;
-            await _instance.TestEndpointParametersAsync(number, varDouble, patternWithoutDelimiter, varByte, integer, int32, int64, varFloat, varString, binary, date, dateTime, password, callback);
+            Client.Option<float> varFloat = default!;
+            Client.Option<string> varString = default!;
+            await _instance.TestEndpointParametersAsync(number, patternWithoutDelimiter, varByte, varDouble, binary, callback, date, dateTime, int32, int64, integer, password, varFloat, varString);
         }
 
         /// <summary>
@@ -215,15 +215,15 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task TestEnumParametersAsyncTest()
         {
-            Client.Option<List<string>> enumHeaderStringArray = default!;
-            Client.Option<string> enumHeaderString = default!;
-            Client.Option<List<string>> enumQueryStringArray = default!;
-            Client.Option<string> enumQueryString = default!;
-            Client.Option<int> enumQueryInteger = default!;
-            Client.Option<double> enumQueryDouble = default!;
-            Client.Option<List<string>> enumFormStringArray = default!;
             Client.Option<string> enumFormString = default!;
-            await _instance.TestEnumParametersAsync(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
+            Client.Option<List<string>> enumFormStringArray = default!;
+            Client.Option<string> enumHeaderString = default!;
+            Client.Option<List<string>> enumHeaderStringArray = default!;
+            Client.Option<double> enumQueryDouble = default!;
+            Client.Option<int> enumQueryInteger = default!;
+            Client.Option<string> enumQueryString = default!;
+            Client.Option<List<string>> enumQueryStringArray = default!;
+            await _instance.TestEnumParametersAsync(enumFormString, enumFormStringArray, enumHeaderString, enumHeaderStringArray, enumQueryDouble, enumQueryInteger, enumQueryString, enumQueryStringArray);
         }
 
         /// <summary>
@@ -232,13 +232,13 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task TestGroupParametersAsyncTest()
         {
-            int requiredStringGroup = default!;
             bool requiredBooleanGroup = default!;
             long requiredInt64Group = default!;
-            Client.Option<int> stringGroup = default!;
+            int requiredStringGroup = default!;
             Client.Option<bool> booleanGroup = default!;
             Client.Option<long> int64Group = default!;
-            await _instance.TestGroupParametersAsync(requiredStringGroup, requiredBooleanGroup, requiredInt64Group, stringGroup, booleanGroup, int64Group);
+            Client.Option<int> stringGroup = default!;
+            await _instance.TestGroupParametersAsync(requiredBooleanGroup, requiredInt64Group, requiredStringGroup, booleanGroup, int64Group, stringGroup);
         }
 
         /// <summary>
@@ -278,16 +278,16 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task TestQueryParameterCollectionFormatAsyncTest()
         {
-            List<string> pipe = default!;
-            List<string> ioutil = default!;
-            List<string> http = default!;
-            List<string> url = default!;
             List<string> context = default!;
+            List<string> http = default!;
+            List<string> ioutil = default!;
+            List<string> pipe = default!;
             string requiredNotNullable = default!;
-            string? requiredNullable = default!;
+            List<string> url = default!;
             Client.Option<string> notRequiredNotNullable = default!;
             Client.Option<string?> notRequiredNullable = default!;
-            await _instance.TestQueryParameterCollectionFormatAsync(pipe, ioutil, http, url, context, requiredNotNullable, requiredNullable, notRequiredNotNullable, notRequiredNullable);
+            string? requiredNullable = default!;
+            await _instance.TestQueryParameterCollectionFormatAsync(context, http, ioutil, pipe, requiredNotNullable, url, notRequiredNotNullable, notRequiredNullable, requiredNullable);
         }
 
         /// <summary>

samples/client/petstore/csharp/generichost/net8/NullReferenceTypes/src/Org.OpenAPITools.Test/Api/UserApiTests.cs

@@ -108,9 +108,9 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task LoginUserAsyncTest()
         {
-            string username = default!;
             string password = default!;
-            var response = await _instance.LoginUserAsync(username, password);
+            string username = default!;
+            var response = await _instance.LoginUserAsync(password, username);
             var model = response.Ok();
             Assert.IsType<string>(model);
         }
@@ -130,9 +130,9 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task UpdateUserAsyncTest()
         {
-            string username = default!;
             User user = default!;
-            await _instance.UpdateUserAsync(username, user);
+            string username = default!;
+            await _instance.UpdateUserAsync(user, username);
         }
     }
 }

samples/client/petstore/csharp/generichost/net8/NullReferenceTypes/src/Org.OpenAPITools/Api/UserApi.cs

@@ -158,11 +158,11 @@ namespace Org.OpenAPITools.Api
         /// 
         /// </remarks>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        Task<ILoginUserApiResponse> LoginUserAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default);
+        Task<ILoginUserApiResponse> LoginUserAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Logs user into the system
@@ -170,11 +170,11 @@ namespace Org.OpenAPITools.Api
         /// <remarks>
         /// 
         /// </remarks>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>?&gt;</returns>
-        Task<ILoginUserApiResponse?> LoginUserOrDefaultAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default);
+        Task<ILoginUserApiResponse?> LoginUserOrDefaultAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Logs out current logged in user session
@@ -204,11 +204,11 @@ namespace Org.OpenAPITools.Api
         /// This can only be done by the logged in user.
         /// </remarks>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        Task<IUpdateUserApiResponse> UpdateUserAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default);
+        Task<IUpdateUserApiResponse> UpdateUserAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Updated user
@@ -216,11 +216,11 @@ namespace Org.OpenAPITools.Api
         /// <remarks>
         /// This can only be done by the logged in user.
         /// </remarks>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>?&gt;</returns>
-        Task<IUpdateUserApiResponse?> UpdateUserOrDefaultAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default);
+        Task<IUpdateUserApiResponse?> UpdateUserOrDefaultAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default);
     }
 
     /// <summary>
@@ -1634,33 +1634,33 @@ namespace Org.OpenAPITools.Api
             partial void OnDeserializationError(ref bool suppressDefaultLog, Exception exception, HttpStatusCode httpStatusCode);
         }
 
-        partial void FormatLoginUser(ref string username, ref string password);
+        partial void FormatLoginUser(ref string password, ref string username);
 
         /// <summary>
         /// Validates the request parameters
         /// </summary>
-        /// <param name="username"></param>
         /// <param name="password"></param>
+        /// <param name="username"></param>
         /// <returns></returns>
-        private void ValidateLoginUser(string username, string password)
+        private void ValidateLoginUser(string password, string username)
         {
-            if (username == null)
-                throw new ArgumentNullException(nameof(username));
-
             if (password == null)
                 throw new ArgumentNullException(nameof(password));
+
+            if (username == null)
+                throw new ArgumentNullException(nameof(username));
         }
 
         /// <summary>
         /// Processes the server response
         /// </summary>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        private void AfterLoginUserDefaultImplementation(ILoginUserApiResponse apiResponseLocalVar, string username, string password)
+        /// <param name="username"></param>
+        private void AfterLoginUserDefaultImplementation(ILoginUserApiResponse apiResponseLocalVar, string password, string username)
         {
             bool suppressDefaultLog = false;
-            AfterLoginUser(ref suppressDefaultLog, apiResponseLocalVar, username, password);
+            AfterLoginUser(ref suppressDefaultLog, apiResponseLocalVar, password, username);
             if (!suppressDefaultLog)
                 Logger.LogInformation("{0,-9} | {1} | {3}", (apiResponseLocalVar.DownloadedAt - apiResponseLocalVar.RequestedAt).TotalSeconds, apiResponseLocalVar.StatusCode, apiResponseLocalVar.Path);
         }
@@ -1670,9 +1670,9 @@ namespace Org.OpenAPITools.Api
         /// </summary>
         /// <param name="suppressDefaultLog"></param>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        partial void AfterLoginUser(ref bool suppressDefaultLog, ILoginUserApiResponse apiResponseLocalVar, string username, string password);
+        /// <param name="username"></param>
+        partial void AfterLoginUser(ref bool suppressDefaultLog, ILoginUserApiResponse apiResponseLocalVar, string password, string username);
 
         /// <summary>
         /// Logs exceptions that occur while retrieving the server response
@@ -1680,12 +1680,12 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        private void OnErrorLoginUserDefaultImplementation(Exception exception, string pathFormat, string path, string username, string password)
+        /// <param name="username"></param>
+        private void OnErrorLoginUserDefaultImplementation(Exception exception, string pathFormat, string path, string password, string username)
         {
             bool suppressDefaultLog = false;
-            OnErrorLoginUser(ref suppressDefaultLog, exception, pathFormat, path, username, password);
+            OnErrorLoginUser(ref suppressDefaultLog, exception, pathFormat, path, password, username);
             if (!suppressDefaultLog)
                 Logger.LogError(exception, "An error occurred while sending the request to the server.");
         }
@@ -1697,22 +1697,22 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        partial void OnErrorLoginUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, string username, string password);
+        /// <param name="username"></param>
+        partial void OnErrorLoginUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, string password, string username);
 
         /// <summary>
         /// Logs user into the system 
         /// </summary>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        public async Task<ILoginUserApiResponse?> LoginUserOrDefaultAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<ILoginUserApiResponse?> LoginUserOrDefaultAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             try
             {
-                return await LoginUserAsync(username, password, cancellationToken).ConfigureAwait(false);
+                return await LoginUserAsync(password, username, cancellationToken).ConfigureAwait(false);
             }
             catch (Exception)
             {
@@ -1724,19 +1724,19 @@ namespace Org.OpenAPITools.Api
         /// Logs user into the system 
         /// </summary>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        public async Task<ILoginUserApiResponse> LoginUserAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<ILoginUserApiResponse> LoginUserAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             UriBuilder uriBuilderLocalVar = new UriBuilder();
 
             try
             {
-                ValidateLoginUser(username, password);
+                ValidateLoginUser(password, username);
 
-                FormatLoginUser(ref username, ref password);
+                FormatLoginUser(ref password, ref username);
 
                 using (HttpRequestMessage httpRequestMessageLocalVar = new HttpRequestMessage())
                 {
@@ -1747,8 +1747,8 @@ namespace Org.OpenAPITools.Api
 
                     System.Collections.Specialized.NameValueCollection parseQueryStringLocalVar = System.Web.HttpUtility.ParseQueryString(string.Empty);
 
-                    parseQueryStringLocalVar["username"] = ClientUtils.ParameterToString(username);
                     parseQueryStringLocalVar["password"] = ClientUtils.ParameterToString(password);
+                    parseQueryStringLocalVar["username"] = ClientUtils.ParameterToString(username);
 
                     uriBuilderLocalVar.Query = parseQueryStringLocalVar.ToString();
 
@@ -1776,7 +1776,7 @@ namespace Org.OpenAPITools.Api
 
                         LoginUserApiResponse apiResponseLocalVar = new(apiResponseLoggerLocalVar, httpRequestMessageLocalVar, httpResponseMessageLocalVar, responseContentLocalVar, "/user/login", requestedAtLocalVar, _jsonSerializerOptions);
 
-                        AfterLoginUserDefaultImplementation(apiResponseLocalVar, username, password);
+                        AfterLoginUserDefaultImplementation(apiResponseLocalVar, password, username);
 
                         Events.ExecuteOnLoginUser(apiResponseLocalVar);
 
@@ -1813,7 +1813,7 @@ namespace Org.OpenAPITools.Api
             }
             catch(Exception e)
             {
-                OnErrorLoginUserDefaultImplementation(e, "/user/login", uriBuilderLocalVar.Path, username, password);
+                OnErrorLoginUserDefaultImplementation(e, "/user/login", uriBuilderLocalVar.Path, password, username);
                 Events.ExecuteOnErrorLoginUser(e);
                 throw;
             }
@@ -2055,33 +2055,33 @@ namespace Org.OpenAPITools.Api
             partial void OnDeserializationError(ref bool suppressDefaultLog, Exception exception, HttpStatusCode httpStatusCode);
         }
 
-        partial void FormatUpdateUser(ref string username, User user);
+        partial void FormatUpdateUser(User user, ref string username);
 
         /// <summary>
         /// Validates the request parameters
         /// </summary>
-        /// <param name="username"></param>
         /// <param name="user"></param>
+        /// <param name="username"></param>
         /// <returns></returns>
-        private void ValidateUpdateUser(string username, User user)
+        private void ValidateUpdateUser(User user, string username)
         {
-            if (username == null)
-                throw new ArgumentNullException(nameof(username));
-
             if (user == null)
                 throw new ArgumentNullException(nameof(user));
+
+            if (username == null)
+                throw new ArgumentNullException(nameof(username));
         }
 
         /// <summary>
         /// Processes the server response
         /// </summary>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        private void AfterUpdateUserDefaultImplementation(IUpdateUserApiResponse apiResponseLocalVar, string username, User user)
+        /// <param name="username"></param>
+        private void AfterUpdateUserDefaultImplementation(IUpdateUserApiResponse apiResponseLocalVar, User user, string username)
         {
             bool suppressDefaultLog = false;
-            AfterUpdateUser(ref suppressDefaultLog, apiResponseLocalVar, username, user);
+            AfterUpdateUser(ref suppressDefaultLog, apiResponseLocalVar, user, username);
             if (!suppressDefaultLog)
                 Logger.LogInformation("{0,-9} | {1} | {3}", (apiResponseLocalVar.DownloadedAt - apiResponseLocalVar.RequestedAt).TotalSeconds, apiResponseLocalVar.StatusCode, apiResponseLocalVar.Path);
         }
@@ -2091,9 +2091,9 @@ namespace Org.OpenAPITools.Api
         /// </summary>
         /// <param name="suppressDefaultLog"></param>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        partial void AfterUpdateUser(ref bool suppressDefaultLog, IUpdateUserApiResponse apiResponseLocalVar, string username, User user);
+        /// <param name="username"></param>
+        partial void AfterUpdateUser(ref bool suppressDefaultLog, IUpdateUserApiResponse apiResponseLocalVar, User user, string username);
 
         /// <summary>
         /// Logs exceptions that occur while retrieving the server response
@@ -2101,12 +2101,12 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        private void OnErrorUpdateUserDefaultImplementation(Exception exception, string pathFormat, string path, string username, User user)
+        /// <param name="username"></param>
+        private void OnErrorUpdateUserDefaultImplementation(Exception exception, string pathFormat, string path, User user, string username)
         {
             bool suppressDefaultLog = false;
-            OnErrorUpdateUser(ref suppressDefaultLog, exception, pathFormat, path, username, user);
+            OnErrorUpdateUser(ref suppressDefaultLog, exception, pathFormat, path, user, username);
             if (!suppressDefaultLog)
                 Logger.LogError(exception, "An error occurred while sending the request to the server.");
         }
@@ -2118,22 +2118,22 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        partial void OnErrorUpdateUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, string username, User user);
+        /// <param name="username"></param>
+        partial void OnErrorUpdateUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, User user, string username);
 
         /// <summary>
         /// Updated user This can only be done by the logged in user.
         /// </summary>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        public async Task<IUpdateUserApiResponse?> UpdateUserOrDefaultAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<IUpdateUserApiResponse?> UpdateUserOrDefaultAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             try
             {
-                return await UpdateUserAsync(username, user, cancellationToken).ConfigureAwait(false);
+                return await UpdateUserAsync(user, username, cancellationToken).ConfigureAwait(false);
             }
             catch (Exception)
             {
@@ -2145,19 +2145,19 @@ namespace Org.OpenAPITools.Api
         /// Updated user This can only be done by the logged in user.
         /// </summary>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        public async Task<IUpdateUserApiResponse> UpdateUserAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<IUpdateUserApiResponse> UpdateUserAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             UriBuilder uriBuilderLocalVar = new UriBuilder();
 
             try
             {
-                ValidateUpdateUser(username, user);
+                ValidateUpdateUser(user, username);
 
-                FormatUpdateUser(ref username, user);
+                FormatUpdateUser(user, ref username);
 
                 using (HttpRequestMessage httpRequestMessageLocalVar = new HttpRequestMessage())
                 {
@@ -2194,7 +2194,7 @@ namespace Org.OpenAPITools.Api
 
                         UpdateUserApiResponse apiResponseLocalVar = new(apiResponseLoggerLocalVar, httpRequestMessageLocalVar, httpResponseMessageLocalVar, responseContentLocalVar, "/user/{username}", requestedAtLocalVar, _jsonSerializerOptions);
 
-                        AfterUpdateUserDefaultImplementation(apiResponseLocalVar, username, user);
+                        AfterUpdateUserDefaultImplementation(apiResponseLocalVar, user, username);
 
                         Events.ExecuteOnUpdateUser(apiResponseLocalVar);
 
@@ -2204,7 +2204,7 @@ namespace Org.OpenAPITools.Api
             }
             catch(Exception e)
             {
-                OnErrorUpdateUserDefaultImplementation(e, "/user/{username}", uriBuilderLocalVar.Path, username, user);
+                OnErrorUpdateUserDefaultImplementation(e, "/user/{username}", uriBuilderLocalVar.Path, user, username);
                 Events.ExecuteOnErrorUpdateUser(e);
                 throw;
             }

samples/client/petstore/csharp/generichost/net8/Petstore/docs/apis/FakeApi.md

@@ -1067,7 +1067,7 @@ No authorization required
 
 <a id="testendpointparameters"></a>
 # **TestEndpointParameters**
-> void TestEndpointParameters (decimal number, double varDouble, string patternWithoutDelimiter, byte[] varByte, int integer = null, int int32 = null, long int64 = null, float varFloat = null, string varString = null, System.IO.Stream binary = null, DateOnly date = null, DateTime dateTime = null, string password = null, string callback = null)
+> void TestEndpointParameters (decimal number, string patternWithoutDelimiter, byte[] varByte, double varDouble, System.IO.Stream binary = null, string callback = null, DateOnly date = null, DateTime dateTime = null, int int32 = null, long int64 = null, int integer = null, string password = null, float varFloat = null, string varString = null)
 
 Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
 
@@ -1095,24 +1095,24 @@ namespace Example
 
             var apiInstance = new FakeApi(config);
             var number = 8.14D;  // decimal | None
-            var varDouble = 1.2D;  // double | None
             var patternWithoutDelimiter = "patternWithoutDelimiter_example";  // string | None
             var varByte = System.Text.Encoding.ASCII.GetBytes("BYTE_ARRAY_DATA_HERE");  // byte[] | None
-            var integer = 56;  // int | None (optional) 
-            var int32 = 56;  // int | None (optional) 
-            var int64 = 789L;  // long | None (optional) 
-            var varFloat = 3.4F;  // float | None (optional) 
-            var varString = "varString_example";  // string | None (optional) 
+            var varDouble = 1.2D;  // double | None
             var binary = new System.IO.MemoryStream(System.IO.File.ReadAllBytes("/path/to/file.txt"));  // System.IO.Stream | None (optional) 
+            var callback = "callback_example";  // string | None (optional) 
             var date = DateOnly.Parse("2013-10-20");  // DateOnly | None (optional) 
             var dateTime = DateTime.Parse(""2010-02-01T10:20:10.111110+01:00"");  // DateTime | None (optional)  (default to "2010-02-01T10:20:10.111110+01:00")
+            var int32 = 56;  // int | None (optional) 
+            var int64 = 789L;  // long | None (optional) 
+            var integer = 56;  // int | None (optional) 
             var password = "password_example";  // string | None (optional) 
-            var callback = "callback_example";  // string | None (optional) 
+            var varFloat = 3.4F;  // float | None (optional) 
+            var varString = "varString_example";  // string | None (optional) 
 
             try
             {
                 // Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
-                apiInstance.TestEndpointParameters(number, varDouble, patternWithoutDelimiter, varByte, integer, int32, int64, varFloat, varString, binary, date, dateTime, password, callback);
+                apiInstance.TestEndpointParameters(number, patternWithoutDelimiter, varByte, varDouble, binary, callback, date, dateTime, int32, int64, integer, password, varFloat, varString);
             }
             catch (ApiException  e)
             {
@@ -1132,7 +1132,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
-    apiInstance.TestEndpointParametersWithHttpInfo(number, varDouble, patternWithoutDelimiter, varByte, integer, int32, int64, varFloat, varString, binary, date, dateTime, password, callback);
+    apiInstance.TestEndpointParametersWithHttpInfo(number, patternWithoutDelimiter, varByte, varDouble, binary, callback, date, dateTime, int32, int64, integer, password, varFloat, varString);
 }
 catch (ApiException e)
 {
@@ -1147,19 +1147,19 @@ catch (ApiException e)
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
 | **number** | **decimal** | None |  |
-| **varDouble** | **double** | None |  |
 | **patternWithoutDelimiter** | **string** | None |  |
 | **varByte** | **byte[]** | None |  |
-| **integer** | **int** | None | [optional]  |
-| **int32** | **int** | None | [optional]  |
-| **int64** | **long** | None | [optional]  |
-| **varFloat** | **float** | None | [optional]  |
-| **varString** | **string** | None | [optional]  |
+| **varDouble** | **double** | None |  |
 | **binary** | **System.IO.Stream****System.IO.Stream** | None | [optional]  |
+| **callback** | **string** | None | [optional]  |
 | **date** | **DateOnly** | None | [optional]  |
 | **dateTime** | **DateTime** | None | [optional] [default to &quot;2010-02-01T10:20:10.111110+01:00&quot;] |
+| **int32** | **int** | None | [optional]  |
+| **int64** | **long** | None | [optional]  |
+| **integer** | **int** | None | [optional]  |
 | **password** | **string** | None | [optional]  |
-| **callback** | **string** | None | [optional]  |
+| **varFloat** | **float** | None | [optional]  |
+| **varString** | **string** | None | [optional]  |
 
 ### Return type
 
@@ -1185,7 +1185,7 @@ void (empty response body)
 
 <a id="testenumparameters"></a>
 # **TestEnumParameters**
-> void TestEnumParameters (List<string> enumHeaderStringArray = null, string enumHeaderString = null, List<string> enumQueryStringArray = null, string enumQueryString = null, int enumQueryInteger = null, double enumQueryDouble = null, List<string> enumFormStringArray = null, string enumFormString = null)
+> void TestEnumParameters (string enumFormString = null, List<string> enumFormStringArray = null, string enumHeaderString = null, List<string> enumHeaderStringArray = null, double enumQueryDouble = null, int enumQueryInteger = null, string enumQueryString = null, List<string> enumQueryStringArray = null)
 
 To test enum parameters
 
@@ -1208,19 +1208,19 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new FakeApi(config);
-            var enumHeaderStringArray = new List<string>(); // List<string> | Header parameter enum test (string array) (optional) 
-            var enumHeaderString = "_abc";  // string | Header parameter enum test (string) (optional)  (default to -efg)
-            var enumQueryStringArray = new List<string>(); // List<string> | Query parameter enum test (string array) (optional) 
-            var enumQueryString = "_abc";  // string | Query parameter enum test (string) (optional)  (default to -efg)
-            var enumQueryInteger = 1;  // int | Query parameter enum test (double) (optional) 
-            var enumQueryDouble = 1.1D;  // double | Query parameter enum test (double) (optional) 
-            var enumFormStringArray = new List<string>(); // List<string> | Form parameter enum test (string array) (optional)  (default to $)
             var enumFormString = "_abc";  // string | Form parameter enum test (string) (optional)  (default to -efg)
+            var enumFormStringArray = new List<string>(); // List<string> | Form parameter enum test (string array) (optional)  (default to $)
+            var enumHeaderString = "_abc";  // string | Header parameter enum test (string) (optional)  (default to -efg)
+            var enumHeaderStringArray = new List<string>(); // List<string> | Header parameter enum test (string array) (optional) 
+            var enumQueryDouble = 1.1D;  // double | Query parameter enum test (double) (optional) 
+            var enumQueryInteger = 1;  // int | Query parameter enum test (double) (optional) 
+            var enumQueryString = "_abc";  // string | Query parameter enum test (string) (optional)  (default to -efg)
+            var enumQueryStringArray = new List<string>(); // List<string> | Query parameter enum test (string array) (optional) 
 
             try
             {
                 // To test enum parameters
-                apiInstance.TestEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
+                apiInstance.TestEnumParameters(enumFormString, enumFormStringArray, enumHeaderString, enumHeaderStringArray, enumQueryDouble, enumQueryInteger, enumQueryString, enumQueryStringArray);
             }
             catch (ApiException  e)
             {
@@ -1240,7 +1240,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // To test enum parameters
-    apiInstance.TestEnumParametersWithHttpInfo(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
+    apiInstance.TestEnumParametersWithHttpInfo(enumFormString, enumFormStringArray, enumHeaderString, enumHeaderStringArray, enumQueryDouble, enumQueryInteger, enumQueryString, enumQueryStringArray);
 }
 catch (ApiException e)
 {
@@ -1254,14 +1254,14 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **enumHeaderStringArray** | [**List&lt;string&gt;**](string.md) | Header parameter enum test (string array) | [optional]  |
-| **enumHeaderString** | **string** | Header parameter enum test (string) | [optional] [default to -efg] |
-| **enumQueryStringArray** | [**List&lt;string&gt;**](string.md) | Query parameter enum test (string array) | [optional]  |
-| **enumQueryString** | **string** | Query parameter enum test (string) | [optional] [default to -efg] |
-| **enumQueryInteger** | **int** | Query parameter enum test (double) | [optional]  |
-| **enumQueryDouble** | **double** | Query parameter enum test (double) | [optional]  |
-| **enumFormStringArray** | [**List&lt;string&gt;**](string.md) | Form parameter enum test (string array) | [optional] [default to $] |
 | **enumFormString** | **string** | Form parameter enum test (string) | [optional] [default to -efg] |
+| **enumFormStringArray** | [**List&lt;string&gt;**](string.md) | Form parameter enum test (string array) | [optional] [default to $] |
+| **enumHeaderString** | **string** | Header parameter enum test (string) | [optional] [default to -efg] |
+| **enumHeaderStringArray** | [**List&lt;string&gt;**](string.md) | Header parameter enum test (string array) | [optional]  |
+| **enumQueryDouble** | **double** | Query parameter enum test (double) | [optional]  |
+| **enumQueryInteger** | **int** | Query parameter enum test (double) | [optional]  |
+| **enumQueryString** | **string** | Query parameter enum test (string) | [optional] [default to -efg] |
+| **enumQueryStringArray** | [**List&lt;string&gt;**](string.md) | Query parameter enum test (string array) | [optional]  |
 
 ### Return type
 
@@ -1287,7 +1287,7 @@ No authorization required
 
 <a id="testgroupparameters"></a>
 # **TestGroupParameters**
-> void TestGroupParameters (int requiredStringGroup, bool requiredBooleanGroup, long requiredInt64Group, int stringGroup = null, bool booleanGroup = null, long int64Group = null)
+> void TestGroupParameters (bool requiredBooleanGroup, long requiredInt64Group, int requiredStringGroup, bool booleanGroup = null, long int64Group = null, int stringGroup = null)
 
 Fake endpoint to test group parameters (optional)
 
@@ -1313,17 +1313,17 @@ namespace Example
             config.AccessToken = "YOUR_BEARER_TOKEN";
 
             var apiInstance = new FakeApi(config);
-            var requiredStringGroup = 56;  // int | Required String in group parameters
             var requiredBooleanGroup = true;  // bool | Required Boolean in group parameters
             var requiredInt64Group = 789L;  // long | Required Integer in group parameters
-            var stringGroup = 56;  // int | String in group parameters (optional) 
+            var requiredStringGroup = 56;  // int | Required String in group parameters
             var booleanGroup = true;  // bool | Boolean in group parameters (optional) 
             var int64Group = 789L;  // long | Integer in group parameters (optional) 
+            var stringGroup = 56;  // int | String in group parameters (optional) 
 
             try
             {
                 // Fake endpoint to test group parameters (optional)
-                apiInstance.TestGroupParameters(requiredStringGroup, requiredBooleanGroup, requiredInt64Group, stringGroup, booleanGroup, int64Group);
+                apiInstance.TestGroupParameters(requiredBooleanGroup, requiredInt64Group, requiredStringGroup, booleanGroup, int64Group, stringGroup);
             }
             catch (ApiException  e)
             {
@@ -1343,7 +1343,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Fake endpoint to test group parameters (optional)
-    apiInstance.TestGroupParametersWithHttpInfo(requiredStringGroup, requiredBooleanGroup, requiredInt64Group, stringGroup, booleanGroup, int64Group);
+    apiInstance.TestGroupParametersWithHttpInfo(requiredBooleanGroup, requiredInt64Group, requiredStringGroup, booleanGroup, int64Group, stringGroup);
 }
 catch (ApiException e)
 {
@@ -1357,12 +1357,12 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **requiredStringGroup** | **int** | Required String in group parameters |  |
 | **requiredBooleanGroup** | **bool** | Required Boolean in group parameters |  |
 | **requiredInt64Group** | **long** | Required Integer in group parameters |  |
-| **stringGroup** | **int** | String in group parameters | [optional]  |
+| **requiredStringGroup** | **int** | Required String in group parameters |  |
 | **booleanGroup** | **bool** | Boolean in group parameters | [optional]  |
 | **int64Group** | **long** | Integer in group parameters | [optional]  |
+| **stringGroup** | **int** | String in group parameters | [optional]  |
 
 ### Return type
 
@@ -1644,7 +1644,7 @@ No authorization required
 
 <a id="testqueryparametercollectionformat"></a>
 # **TestQueryParameterCollectionFormat**
-> void TestQueryParameterCollectionFormat (List<string> pipe, List<string> ioutil, List<string> http, List<string> url, List<string> context, string requiredNotNullable, string requiredNullable, string notRequiredNotNullable = null, string notRequiredNullable = null)
+> void TestQueryParameterCollectionFormat (List<string> context, List<string> http, List<string> ioutil, List<string> pipe, string requiredNotNullable, List<string> url, string notRequiredNotNullable = null, string notRequiredNullable = null, string requiredNullable)
 
 
 
@@ -1667,19 +1667,19 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new FakeApi(config);
-            var pipe = new List<string>(); // List<string> | 
-            var ioutil = new List<string>(); // List<string> | 
-            var http = new List<string>(); // List<string> | 
-            var url = new List<string>(); // List<string> | 
             var context = new List<string>(); // List<string> | 
+            var http = new List<string>(); // List<string> | 
+            var ioutil = new List<string>(); // List<string> | 
+            var pipe = new List<string>(); // List<string> | 
             var requiredNotNullable = "requiredNotNullable_example";  // string | 
-            var requiredNullable = "requiredNullable_example";  // string | 
+            var url = new List<string>(); // List<string> | 
             var notRequiredNotNullable = "notRequiredNotNullable_example";  // string |  (optional) 
             var notRequiredNullable = "notRequiredNullable_example";  // string |  (optional) 
+            var requiredNullable = "requiredNullable_example";  // string | 
 
             try
             {
-                apiInstance.TestQueryParameterCollectionFormat(pipe, ioutil, http, url, context, requiredNotNullable, requiredNullable, notRequiredNotNullable, notRequiredNullable);
+                apiInstance.TestQueryParameterCollectionFormat(context, http, ioutil, pipe, requiredNotNullable, url, notRequiredNotNullable, notRequiredNullable, requiredNullable);
             }
             catch (ApiException  e)
             {
@@ -1698,7 +1698,7 @@ This returns an ApiResponse object which contains the response data, status code
 ```csharp
 try
 {
-    apiInstance.TestQueryParameterCollectionFormatWithHttpInfo(pipe, ioutil, http, url, context, requiredNotNullable, requiredNullable, notRequiredNotNullable, notRequiredNullable);
+    apiInstance.TestQueryParameterCollectionFormatWithHttpInfo(context, http, ioutil, pipe, requiredNotNullable, url, notRequiredNotNullable, notRequiredNullable, requiredNullable);
 }
 catch (ApiException e)
 {
@@ -1712,15 +1712,15 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **pipe** | [**List&lt;string&gt;**](string.md) |  |  |
-| **ioutil** | [**List&lt;string&gt;**](string.md) |  |  |
-| **http** | [**List&lt;string&gt;**](string.md) |  |  |
-| **url** | [**List&lt;string&gt;**](string.md) |  |  |
 | **context** | [**List&lt;string&gt;**](string.md) |  |  |
+| **http** | [**List&lt;string&gt;**](string.md) |  |  |
+| **ioutil** | [**List&lt;string&gt;**](string.md) |  |  |
+| **pipe** | [**List&lt;string&gt;**](string.md) |  |  |
 | **requiredNotNullable** | **string** |  |  |
-| **requiredNullable** | **string** |  |  |
+| **url** | [**List&lt;string&gt;**](string.md) |  |  |
 | **notRequiredNotNullable** | **string** |  | [optional]  |
 | **notRequiredNullable** | **string** |  | [optional]  |
+| **requiredNullable** | **string** |  |  |
 
 ### Return type
 

samples/client/petstore/csharp/generichost/net8/Petstore/docs/apis/UserApi.md

@@ -453,7 +453,7 @@ No authorization required
 
 <a id="loginuser"></a>
 # **LoginUser**
-> string LoginUser (string username, string password)
+> string LoginUser (string password, string username)
 
 Logs user into the system
 
@@ -474,13 +474,13 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new UserApi(config);
-            var username = "username_example";  // string | The user name for login
             var password = "password_example";  // string | The password for login in clear text
+            var username = "username_example";  // string | The user name for login
 
             try
             {
                 // Logs user into the system
-                string result = apiInstance.LoginUser(username, password);
+                string result = apiInstance.LoginUser(password, username);
                 Debug.WriteLine(result);
             }
             catch (ApiException  e)
@@ -501,7 +501,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Logs user into the system
-    ApiResponse<string> response = apiInstance.LoginUserWithHttpInfo(username, password);
+    ApiResponse<string> response = apiInstance.LoginUserWithHttpInfo(password, username);
     Debug.Write("Status Code: " + response.StatusCode);
     Debug.Write("Response Headers: " + response.Headers);
     Debug.Write("Response Body: " + response.Data);
@@ -518,8 +518,8 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **username** | **string** | The user name for login |  |
 | **password** | **string** | The password for login in clear text |  |
+| **username** | **string** | The user name for login |  |
 
 ### Return type
 
@@ -625,7 +625,7 @@ No authorization required
 
 <a id="updateuser"></a>
 # **UpdateUser**
-> void UpdateUser (string username, User user)
+> void UpdateUser (User user, string username)
 
 Updated user
 
@@ -648,13 +648,13 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new UserApi(config);
-            var username = "username_example";  // string | name that need to be deleted
             var user = new User(); // User | Updated user object
+            var username = "username_example";  // string | name that need to be deleted
 
             try
             {
                 // Updated user
-                apiInstance.UpdateUser(username, user);
+                apiInstance.UpdateUser(user, username);
             }
             catch (ApiException  e)
             {
@@ -674,7 +674,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Updated user
-    apiInstance.UpdateUserWithHttpInfo(username, user);
+    apiInstance.UpdateUserWithHttpInfo(user, username);
 }
 catch (ApiException e)
 {
@@ -688,8 +688,8 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **username** | **string** | name that need to be deleted |  |
 | **user** | [**User**](User.md) | Updated user object |  |
+| **username** | **string** | name that need to be deleted |  |
 
 ### Return type
 

samples/client/petstore/csharp/generichost/net8/Petstore/src/Org.OpenAPITools.Test/Api/FakeApiTests.cs

@@ -193,20 +193,20 @@ namespace Org.OpenAPITools.Test.Api
         public async Task TestEndpointParametersAsyncTest()
         {
             decimal number = default;
-            double varDouble = default;
             string patternWithoutDelimiter = default;
             byte[] varByte = default;
-            Client.Option<int> integer = default;
-            Client.Option<int> int32 = default;
-            Client.Option<long> int64 = default;
-            Client.Option<float> varFloat = default;
-            Client.Option<string> varString = default;
+            double varDouble = default;
             Client.Option<System.IO.Stream> binary = default;
+            Client.Option<string> callback = default;
             Client.Option<DateOnly> date = default;
             Client.Option<DateTime> dateTime = default;
+            Client.Option<int> int32 = default;
+            Client.Option<long> int64 = default;
+            Client.Option<int> integer = default;
             Client.Option<string> password = default;
-            Client.Option<string> callback = default;
-            await _instance.TestEndpointParametersAsync(number, varDouble, patternWithoutDelimiter, varByte, integer, int32, int64, varFloat, varString, binary, date, dateTime, password, callback);
+            Client.Option<float> varFloat = default;
+            Client.Option<string> varString = default;
+            await _instance.TestEndpointParametersAsync(number, patternWithoutDelimiter, varByte, varDouble, binary, callback, date, dateTime, int32, int64, integer, password, varFloat, varString);
         }
 
         /// <summary>
@@ -215,15 +215,15 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task TestEnumParametersAsyncTest()
         {
-            Client.Option<List<string>> enumHeaderStringArray = default;
-            Client.Option<string> enumHeaderString = default;
-            Client.Option<List<string>> enumQueryStringArray = default;
-            Client.Option<string> enumQueryString = default;
-            Client.Option<int> enumQueryInteger = default;
-            Client.Option<double> enumQueryDouble = default;
-            Client.Option<List<string>> enumFormStringArray = default;
             Client.Option<string> enumFormString = default;
-            await _instance.TestEnumParametersAsync(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
+            Client.Option<List<string>> enumFormStringArray = default;
+            Client.Option<string> enumHeaderString = default;
+            Client.Option<List<string>> enumHeaderStringArray = default;
+            Client.Option<double> enumQueryDouble = default;
+            Client.Option<int> enumQueryInteger = default;
+            Client.Option<string> enumQueryString = default;
+            Client.Option<List<string>> enumQueryStringArray = default;
+            await _instance.TestEnumParametersAsync(enumFormString, enumFormStringArray, enumHeaderString, enumHeaderStringArray, enumQueryDouble, enumQueryInteger, enumQueryString, enumQueryStringArray);
         }
 
         /// <summary>
@@ -232,13 +232,13 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task TestGroupParametersAsyncTest()
         {
-            int requiredStringGroup = default;
             bool requiredBooleanGroup = default;
             long requiredInt64Group = default;
-            Client.Option<int> stringGroup = default;
+            int requiredStringGroup = default;
             Client.Option<bool> booleanGroup = default;
             Client.Option<long> int64Group = default;
-            await _instance.TestGroupParametersAsync(requiredStringGroup, requiredBooleanGroup, requiredInt64Group, stringGroup, booleanGroup, int64Group);
+            Client.Option<int> stringGroup = default;
+            await _instance.TestGroupParametersAsync(requiredBooleanGroup, requiredInt64Group, requiredStringGroup, booleanGroup, int64Group, stringGroup);
         }
 
         /// <summary>
@@ -278,16 +278,16 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task TestQueryParameterCollectionFormatAsyncTest()
         {
-            List<string> pipe = default;
-            List<string> ioutil = default;
-            List<string> http = default;
-            List<string> url = default;
             List<string> context = default;
+            List<string> http = default;
+            List<string> ioutil = default;
+            List<string> pipe = default;
             string requiredNotNullable = default;
-            string requiredNullable = default;
+            List<string> url = default;
             Client.Option<string> notRequiredNotNullable = default;
             Client.Option<string> notRequiredNullable = default;
-            await _instance.TestQueryParameterCollectionFormatAsync(pipe, ioutil, http, url, context, requiredNotNullable, requiredNullable, notRequiredNotNullable, notRequiredNullable);
+            string requiredNullable = default;
+            await _instance.TestQueryParameterCollectionFormatAsync(context, http, ioutil, pipe, requiredNotNullable, url, notRequiredNotNullable, notRequiredNullable, requiredNullable);
         }
 
         /// <summary>

samples/client/petstore/csharp/generichost/net8/Petstore/src/Org.OpenAPITools.Test/Api/UserApiTests.cs

@@ -108,9 +108,9 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task LoginUserAsyncTest()
         {
-            string username = default;
             string password = default;
-            var response = await _instance.LoginUserAsync(username, password);
+            string username = default;
+            var response = await _instance.LoginUserAsync(password, username);
             var model = response.Ok();
             Assert.IsType<string>(model);
         }
@@ -130,9 +130,9 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task UpdateUserAsyncTest()
         {
-            string username = default;
             User user = default;
-            await _instance.UpdateUserAsync(username, user);
+            string username = default;
+            await _instance.UpdateUserAsync(user, username);
         }
     }
 }

samples/client/petstore/csharp/generichost/net8/Petstore/src/Org.OpenAPITools/Api/UserApi.cs

@@ -156,11 +156,11 @@ namespace Org.OpenAPITools.Api
         /// 
         /// </remarks>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        Task<ILoginUserApiResponse> LoginUserAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default);
+        Task<ILoginUserApiResponse> LoginUserAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Logs user into the system
@@ -168,11 +168,11 @@ namespace Org.OpenAPITools.Api
         /// <remarks>
         /// 
         /// </remarks>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        Task<ILoginUserApiResponse> LoginUserOrDefaultAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default);
+        Task<ILoginUserApiResponse> LoginUserOrDefaultAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Logs out current logged in user session
@@ -202,11 +202,11 @@ namespace Org.OpenAPITools.Api
         /// This can only be done by the logged in user.
         /// </remarks>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        Task<IUpdateUserApiResponse> UpdateUserAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default);
+        Task<IUpdateUserApiResponse> UpdateUserAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Updated user
@@ -214,11 +214,11 @@ namespace Org.OpenAPITools.Api
         /// <remarks>
         /// This can only be done by the logged in user.
         /// </remarks>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        Task<IUpdateUserApiResponse> UpdateUserOrDefaultAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default);
+        Task<IUpdateUserApiResponse> UpdateUserOrDefaultAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default);
     }
 
     /// <summary>
@@ -1632,33 +1632,33 @@ namespace Org.OpenAPITools.Api
             partial void OnDeserializationError(ref bool suppressDefaultLog, Exception exception, HttpStatusCode httpStatusCode);
         }
 
-        partial void FormatLoginUser(ref string username, ref string password);
+        partial void FormatLoginUser(ref string password, ref string username);
 
         /// <summary>
         /// Validates the request parameters
         /// </summary>
-        /// <param name="username"></param>
         /// <param name="password"></param>
+        /// <param name="username"></param>
         /// <returns></returns>
-        private void ValidateLoginUser(string username, string password)
+        private void ValidateLoginUser(string password, string username)
         {
-            if (username == null)
-                throw new ArgumentNullException(nameof(username));
-
             if (password == null)
                 throw new ArgumentNullException(nameof(password));
+
+            if (username == null)
+                throw new ArgumentNullException(nameof(username));
         }
 
         /// <summary>
         /// Processes the server response
         /// </summary>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        private void AfterLoginUserDefaultImplementation(ILoginUserApiResponse apiResponseLocalVar, string username, string password)
+        /// <param name="username"></param>
+        private void AfterLoginUserDefaultImplementation(ILoginUserApiResponse apiResponseLocalVar, string password, string username)
         {
             bool suppressDefaultLog = false;
-            AfterLoginUser(ref suppressDefaultLog, apiResponseLocalVar, username, password);
+            AfterLoginUser(ref suppressDefaultLog, apiResponseLocalVar, password, username);
             if (!suppressDefaultLog)
                 Logger.LogInformation("{0,-9} | {1} | {3}", (apiResponseLocalVar.DownloadedAt - apiResponseLocalVar.RequestedAt).TotalSeconds, apiResponseLocalVar.StatusCode, apiResponseLocalVar.Path);
         }
@@ -1668,9 +1668,9 @@ namespace Org.OpenAPITools.Api
         /// </summary>
         /// <param name="suppressDefaultLog"></param>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        partial void AfterLoginUser(ref bool suppressDefaultLog, ILoginUserApiResponse apiResponseLocalVar, string username, string password);
+        /// <param name="username"></param>
+        partial void AfterLoginUser(ref bool suppressDefaultLog, ILoginUserApiResponse apiResponseLocalVar, string password, string username);
 
         /// <summary>
         /// Logs exceptions that occur while retrieving the server response
@@ -1678,12 +1678,12 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        private void OnErrorLoginUserDefaultImplementation(Exception exception, string pathFormat, string path, string username, string password)
+        /// <param name="username"></param>
+        private void OnErrorLoginUserDefaultImplementation(Exception exception, string pathFormat, string path, string password, string username)
         {
             bool suppressDefaultLog = false;
-            OnErrorLoginUser(ref suppressDefaultLog, exception, pathFormat, path, username, password);
+            OnErrorLoginUser(ref suppressDefaultLog, exception, pathFormat, path, password, username);
             if (!suppressDefaultLog)
                 Logger.LogError(exception, "An error occurred while sending the request to the server.");
         }
@@ -1695,22 +1695,22 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        partial void OnErrorLoginUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, string username, string password);
+        /// <param name="username"></param>
+        partial void OnErrorLoginUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, string password, string username);
 
         /// <summary>
         /// Logs user into the system 
         /// </summary>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        public async Task<ILoginUserApiResponse> LoginUserOrDefaultAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<ILoginUserApiResponse> LoginUserOrDefaultAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             try
             {
-                return await LoginUserAsync(username, password, cancellationToken).ConfigureAwait(false);
+                return await LoginUserAsync(password, username, cancellationToken).ConfigureAwait(false);
             }
             catch (Exception)
             {
@@ -1722,19 +1722,19 @@ namespace Org.OpenAPITools.Api
         /// Logs user into the system 
         /// </summary>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        public async Task<ILoginUserApiResponse> LoginUserAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<ILoginUserApiResponse> LoginUserAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             UriBuilder uriBuilderLocalVar = new UriBuilder();
 
             try
             {
-                ValidateLoginUser(username, password);
+                ValidateLoginUser(password, username);
 
-                FormatLoginUser(ref username, ref password);
+                FormatLoginUser(ref password, ref username);
 
                 using (HttpRequestMessage httpRequestMessageLocalVar = new HttpRequestMessage())
                 {
@@ -1745,8 +1745,8 @@ namespace Org.OpenAPITools.Api
 
                     System.Collections.Specialized.NameValueCollection parseQueryStringLocalVar = System.Web.HttpUtility.ParseQueryString(string.Empty);
 
-                    parseQueryStringLocalVar["username"] = ClientUtils.ParameterToString(username);
                     parseQueryStringLocalVar["password"] = ClientUtils.ParameterToString(password);
+                    parseQueryStringLocalVar["username"] = ClientUtils.ParameterToString(username);
 
                     uriBuilderLocalVar.Query = parseQueryStringLocalVar.ToString();
 
@@ -1774,7 +1774,7 @@ namespace Org.OpenAPITools.Api
 
                         LoginUserApiResponse apiResponseLocalVar = new(apiResponseLoggerLocalVar, httpRequestMessageLocalVar, httpResponseMessageLocalVar, responseContentLocalVar, "/user/login", requestedAtLocalVar, _jsonSerializerOptions);
 
-                        AfterLoginUserDefaultImplementation(apiResponseLocalVar, username, password);
+                        AfterLoginUserDefaultImplementation(apiResponseLocalVar, password, username);
 
                         Events.ExecuteOnLoginUser(apiResponseLocalVar);
 
@@ -1811,7 +1811,7 @@ namespace Org.OpenAPITools.Api
             }
             catch(Exception e)
             {
-                OnErrorLoginUserDefaultImplementation(e, "/user/login", uriBuilderLocalVar.Path, username, password);
+                OnErrorLoginUserDefaultImplementation(e, "/user/login", uriBuilderLocalVar.Path, password, username);
                 Events.ExecuteOnErrorLoginUser(e);
                 throw;
             }
@@ -2053,33 +2053,33 @@ namespace Org.OpenAPITools.Api
             partial void OnDeserializationError(ref bool suppressDefaultLog, Exception exception, HttpStatusCode httpStatusCode);
         }
 
-        partial void FormatUpdateUser(ref string username, User user);
+        partial void FormatUpdateUser(User user, ref string username);
 
         /// <summary>
         /// Validates the request parameters
         /// </summary>
-        /// <param name="username"></param>
         /// <param name="user"></param>
+        /// <param name="username"></param>
         /// <returns></returns>
-        private void ValidateUpdateUser(string username, User user)
+        private void ValidateUpdateUser(User user, string username)
         {
-            if (username == null)
-                throw new ArgumentNullException(nameof(username));
-
             if (user == null)
                 throw new ArgumentNullException(nameof(user));
+
+            if (username == null)
+                throw new ArgumentNullException(nameof(username));
         }
 
         /// <summary>
         /// Processes the server response
         /// </summary>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        private void AfterUpdateUserDefaultImplementation(IUpdateUserApiResponse apiResponseLocalVar, string username, User user)
+        /// <param name="username"></param>
+        private void AfterUpdateUserDefaultImplementation(IUpdateUserApiResponse apiResponseLocalVar, User user, string username)
         {
             bool suppressDefaultLog = false;
-            AfterUpdateUser(ref suppressDefaultLog, apiResponseLocalVar, username, user);
+            AfterUpdateUser(ref suppressDefaultLog, apiResponseLocalVar, user, username);
             if (!suppressDefaultLog)
                 Logger.LogInformation("{0,-9} | {1} | {3}", (apiResponseLocalVar.DownloadedAt - apiResponseLocalVar.RequestedAt).TotalSeconds, apiResponseLocalVar.StatusCode, apiResponseLocalVar.Path);
         }
@@ -2089,9 +2089,9 @@ namespace Org.OpenAPITools.Api
         /// </summary>
         /// <param name="suppressDefaultLog"></param>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        partial void AfterUpdateUser(ref bool suppressDefaultLog, IUpdateUserApiResponse apiResponseLocalVar, string username, User user);
+        /// <param name="username"></param>
+        partial void AfterUpdateUser(ref bool suppressDefaultLog, IUpdateUserApiResponse apiResponseLocalVar, User user, string username);
 
         /// <summary>
         /// Logs exceptions that occur while retrieving the server response
@@ -2099,12 +2099,12 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        private void OnErrorUpdateUserDefaultImplementation(Exception exception, string pathFormat, string path, string username, User user)
+        /// <param name="username"></param>
+        private void OnErrorUpdateUserDefaultImplementation(Exception exception, string pathFormat, string path, User user, string username)
         {
             bool suppressDefaultLog = false;
-            OnErrorUpdateUser(ref suppressDefaultLog, exception, pathFormat, path, username, user);
+            OnErrorUpdateUser(ref suppressDefaultLog, exception, pathFormat, path, user, username);
             if (!suppressDefaultLog)
                 Logger.LogError(exception, "An error occurred while sending the request to the server.");
         }
@@ -2116,22 +2116,22 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        partial void OnErrorUpdateUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, string username, User user);
+        /// <param name="username"></param>
+        partial void OnErrorUpdateUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, User user, string username);
 
         /// <summary>
         /// Updated user This can only be done by the logged in user.
         /// </summary>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        public async Task<IUpdateUserApiResponse> UpdateUserOrDefaultAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<IUpdateUserApiResponse> UpdateUserOrDefaultAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             try
             {
-                return await UpdateUserAsync(username, user, cancellationToken).ConfigureAwait(false);
+                return await UpdateUserAsync(user, username, cancellationToken).ConfigureAwait(false);
             }
             catch (Exception)
             {
@@ -2143,19 +2143,19 @@ namespace Org.OpenAPITools.Api
         /// Updated user This can only be done by the logged in user.
         /// </summary>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        public async Task<IUpdateUserApiResponse> UpdateUserAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<IUpdateUserApiResponse> UpdateUserAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             UriBuilder uriBuilderLocalVar = new UriBuilder();
 
             try
             {
-                ValidateUpdateUser(username, user);
+                ValidateUpdateUser(user, username);
 
-                FormatUpdateUser(ref username, user);
+                FormatUpdateUser(user, ref username);
 
                 using (HttpRequestMessage httpRequestMessageLocalVar = new HttpRequestMessage())
                 {
@@ -2192,7 +2192,7 @@ namespace Org.OpenAPITools.Api
 
                         UpdateUserApiResponse apiResponseLocalVar = new(apiResponseLoggerLocalVar, httpRequestMessageLocalVar, httpResponseMessageLocalVar, responseContentLocalVar, "/user/{username}", requestedAtLocalVar, _jsonSerializerOptions);
 
-                        AfterUpdateUserDefaultImplementation(apiResponseLocalVar, username, user);
+                        AfterUpdateUserDefaultImplementation(apiResponseLocalVar, user, username);
 
                         Events.ExecuteOnUpdateUser(apiResponseLocalVar);
 
@@ -2202,7 +2202,7 @@ namespace Org.OpenAPITools.Api
             }
             catch(Exception e)
             {
-                OnErrorUpdateUserDefaultImplementation(e, "/user/{username}", uriBuilderLocalVar.Path, username, user);
+                OnErrorUpdateUserDefaultImplementation(e, "/user/{username}", uriBuilderLocalVar.Path, user, username);
                 Events.ExecuteOnErrorUpdateUser(e);
                 throw;
             }

samples/client/petstore/csharp/generichost/net8/SourceGeneration/docs/apis/FakeApi.md

@@ -1067,7 +1067,7 @@ No authorization required
 
 <a id="testendpointparameters"></a>
 # **TestEndpointParameters**
-> void TestEndpointParameters (decimal number, double varDouble, string patternWithoutDelimiter, byte[] varByte, int integer = null, int int32 = null, long int64 = null, float varFloat = null, string varString = null, System.IO.Stream binary = null, DateOnly date = null, DateTime dateTime = null, string password = null, string callback = null)
+> void TestEndpointParameters (decimal number, string patternWithoutDelimiter, byte[] varByte, double varDouble, System.IO.Stream binary = null, string callback = null, DateOnly date = null, DateTime dateTime = null, int int32 = null, long int64 = null, int integer = null, string password = null, float varFloat = null, string varString = null)
 
 Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
 
@@ -1095,24 +1095,24 @@ namespace Example
 
             var apiInstance = new FakeApi(config);
             var number = 8.14D;  // decimal | None
-            var varDouble = 1.2D;  // double | None
             var patternWithoutDelimiter = "patternWithoutDelimiter_example";  // string | None
             var varByte = System.Text.Encoding.ASCII.GetBytes("BYTE_ARRAY_DATA_HERE");  // byte[] | None
-            var integer = 56;  // int | None (optional) 
-            var int32 = 56;  // int | None (optional) 
-            var int64 = 789L;  // long | None (optional) 
-            var varFloat = 3.4F;  // float | None (optional) 
-            var varString = "varString_example";  // string | None (optional) 
+            var varDouble = 1.2D;  // double | None
             var binary = new System.IO.MemoryStream(System.IO.File.ReadAllBytes("/path/to/file.txt"));  // System.IO.Stream | None (optional) 
+            var callback = "callback_example";  // string | None (optional) 
             var date = DateOnly.Parse("2013-10-20");  // DateOnly | None (optional) 
             var dateTime = DateTime.Parse(""2010-02-01T10:20:10.111110+01:00"");  // DateTime | None (optional)  (default to "2010-02-01T10:20:10.111110+01:00")
+            var int32 = 56;  // int | None (optional) 
+            var int64 = 789L;  // long | None (optional) 
+            var integer = 56;  // int | None (optional) 
             var password = "password_example";  // string | None (optional) 
-            var callback = "callback_example";  // string | None (optional) 
+            var varFloat = 3.4F;  // float | None (optional) 
+            var varString = "varString_example";  // string | None (optional) 
 
             try
             {
                 // Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
-                apiInstance.TestEndpointParameters(number, varDouble, patternWithoutDelimiter, varByte, integer, int32, int64, varFloat, varString, binary, date, dateTime, password, callback);
+                apiInstance.TestEndpointParameters(number, patternWithoutDelimiter, varByte, varDouble, binary, callback, date, dateTime, int32, int64, integer, password, varFloat, varString);
             }
             catch (ApiException  e)
             {
@@ -1132,7 +1132,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
-    apiInstance.TestEndpointParametersWithHttpInfo(number, varDouble, patternWithoutDelimiter, varByte, integer, int32, int64, varFloat, varString, binary, date, dateTime, password, callback);
+    apiInstance.TestEndpointParametersWithHttpInfo(number, patternWithoutDelimiter, varByte, varDouble, binary, callback, date, dateTime, int32, int64, integer, password, varFloat, varString);
 }
 catch (ApiException e)
 {
@@ -1147,19 +1147,19 @@ catch (ApiException e)
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
 | **number** | **decimal** | None |  |
-| **varDouble** | **double** | None |  |
 | **patternWithoutDelimiter** | **string** | None |  |
 | **varByte** | **byte[]** | None |  |
-| **integer** | **int** | None | [optional]  |
-| **int32** | **int** | None | [optional]  |
-| **int64** | **long** | None | [optional]  |
-| **varFloat** | **float** | None | [optional]  |
-| **varString** | **string** | None | [optional]  |
+| **varDouble** | **double** | None |  |
 | **binary** | **System.IO.Stream****System.IO.Stream** | None | [optional]  |
+| **callback** | **string** | None | [optional]  |
 | **date** | **DateOnly** | None | [optional]  |
 | **dateTime** | **DateTime** | None | [optional] [default to &quot;2010-02-01T10:20:10.111110+01:00&quot;] |
+| **int32** | **int** | None | [optional]  |
+| **int64** | **long** | None | [optional]  |
+| **integer** | **int** | None | [optional]  |
 | **password** | **string** | None | [optional]  |
-| **callback** | **string** | None | [optional]  |
+| **varFloat** | **float** | None | [optional]  |
+| **varString** | **string** | None | [optional]  |
 
 ### Return type
 
@@ -1185,7 +1185,7 @@ void (empty response body)
 
 <a id="testenumparameters"></a>
 # **TestEnumParameters**
-> void TestEnumParameters (List<string> enumHeaderStringArray = null, string enumHeaderString = null, List<string> enumQueryStringArray = null, string enumQueryString = null, int enumQueryInteger = null, double enumQueryDouble = null, List<string> enumFormStringArray = null, string enumFormString = null)
+> void TestEnumParameters (string enumFormString = null, List<string> enumFormStringArray = null, string enumHeaderString = null, List<string> enumHeaderStringArray = null, double enumQueryDouble = null, int enumQueryInteger = null, string enumQueryString = null, List<string> enumQueryStringArray = null)
 
 To test enum parameters
 
@@ -1208,19 +1208,19 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new FakeApi(config);
-            var enumHeaderStringArray = new List<string>(); // List<string> | Header parameter enum test (string array) (optional) 
-            var enumHeaderString = "_abc";  // string | Header parameter enum test (string) (optional)  (default to -efg)
-            var enumQueryStringArray = new List<string>(); // List<string> | Query parameter enum test (string array) (optional) 
-            var enumQueryString = "_abc";  // string | Query parameter enum test (string) (optional)  (default to -efg)
-            var enumQueryInteger = 1;  // int | Query parameter enum test (double) (optional) 
-            var enumQueryDouble = 1.1D;  // double | Query parameter enum test (double) (optional) 
-            var enumFormStringArray = new List<string>(); // List<string> | Form parameter enum test (string array) (optional)  (default to $)
             var enumFormString = "_abc";  // string | Form parameter enum test (string) (optional)  (default to -efg)
+            var enumFormStringArray = new List<string>(); // List<string> | Form parameter enum test (string array) (optional)  (default to $)
+            var enumHeaderString = "_abc";  // string | Header parameter enum test (string) (optional)  (default to -efg)
+            var enumHeaderStringArray = new List<string>(); // List<string> | Header parameter enum test (string array) (optional) 
+            var enumQueryDouble = 1.1D;  // double | Query parameter enum test (double) (optional) 
+            var enumQueryInteger = 1;  // int | Query parameter enum test (double) (optional) 
+            var enumQueryString = "_abc";  // string | Query parameter enum test (string) (optional)  (default to -efg)
+            var enumQueryStringArray = new List<string>(); // List<string> | Query parameter enum test (string array) (optional) 
 
             try
             {
                 // To test enum parameters
-                apiInstance.TestEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
+                apiInstance.TestEnumParameters(enumFormString, enumFormStringArray, enumHeaderString, enumHeaderStringArray, enumQueryDouble, enumQueryInteger, enumQueryString, enumQueryStringArray);
             }
             catch (ApiException  e)
             {
@@ -1240,7 +1240,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // To test enum parameters
-    apiInstance.TestEnumParametersWithHttpInfo(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
+    apiInstance.TestEnumParametersWithHttpInfo(enumFormString, enumFormStringArray, enumHeaderString, enumHeaderStringArray, enumQueryDouble, enumQueryInteger, enumQueryString, enumQueryStringArray);
 }
 catch (ApiException e)
 {
@@ -1254,14 +1254,14 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **enumHeaderStringArray** | [**List&lt;string&gt;**](string.md) | Header parameter enum test (string array) | [optional]  |
-| **enumHeaderString** | **string** | Header parameter enum test (string) | [optional] [default to -efg] |
-| **enumQueryStringArray** | [**List&lt;string&gt;**](string.md) | Query parameter enum test (string array) | [optional]  |
-| **enumQueryString** | **string** | Query parameter enum test (string) | [optional] [default to -efg] |
-| **enumQueryInteger** | **int** | Query parameter enum test (double) | [optional]  |
-| **enumQueryDouble** | **double** | Query parameter enum test (double) | [optional]  |
-| **enumFormStringArray** | [**List&lt;string&gt;**](string.md) | Form parameter enum test (string array) | [optional] [default to $] |
 | **enumFormString** | **string** | Form parameter enum test (string) | [optional] [default to -efg] |
+| **enumFormStringArray** | [**List&lt;string&gt;**](string.md) | Form parameter enum test (string array) | [optional] [default to $] |
+| **enumHeaderString** | **string** | Header parameter enum test (string) | [optional] [default to -efg] |
+| **enumHeaderStringArray** | [**List&lt;string&gt;**](string.md) | Header parameter enum test (string array) | [optional]  |
+| **enumQueryDouble** | **double** | Query parameter enum test (double) | [optional]  |
+| **enumQueryInteger** | **int** | Query parameter enum test (double) | [optional]  |
+| **enumQueryString** | **string** | Query parameter enum test (string) | [optional] [default to -efg] |
+| **enumQueryStringArray** | [**List&lt;string&gt;**](string.md) | Query parameter enum test (string array) | [optional]  |
 
 ### Return type
 
@@ -1287,7 +1287,7 @@ No authorization required
 
 <a id="testgroupparameters"></a>
 # **TestGroupParameters**
-> void TestGroupParameters (int requiredStringGroup, bool requiredBooleanGroup, long requiredInt64Group, int stringGroup = null, bool booleanGroup = null, long int64Group = null)
+> void TestGroupParameters (bool requiredBooleanGroup, long requiredInt64Group, int requiredStringGroup, bool booleanGroup = null, long int64Group = null, int stringGroup = null)
 
 Fake endpoint to test group parameters (optional)
 
@@ -1313,17 +1313,17 @@ namespace Example
             config.AccessToken = "YOUR_BEARER_TOKEN";
 
             var apiInstance = new FakeApi(config);
-            var requiredStringGroup = 56;  // int | Required String in group parameters
             var requiredBooleanGroup = true;  // bool | Required Boolean in group parameters
             var requiredInt64Group = 789L;  // long | Required Integer in group parameters
-            var stringGroup = 56;  // int | String in group parameters (optional) 
+            var requiredStringGroup = 56;  // int | Required String in group parameters
             var booleanGroup = true;  // bool | Boolean in group parameters (optional) 
             var int64Group = 789L;  // long | Integer in group parameters (optional) 
+            var stringGroup = 56;  // int | String in group parameters (optional) 
 
             try
             {
                 // Fake endpoint to test group parameters (optional)
-                apiInstance.TestGroupParameters(requiredStringGroup, requiredBooleanGroup, requiredInt64Group, stringGroup, booleanGroup, int64Group);
+                apiInstance.TestGroupParameters(requiredBooleanGroup, requiredInt64Group, requiredStringGroup, booleanGroup, int64Group, stringGroup);
             }
             catch (ApiException  e)
             {
@@ -1343,7 +1343,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Fake endpoint to test group parameters (optional)
-    apiInstance.TestGroupParametersWithHttpInfo(requiredStringGroup, requiredBooleanGroup, requiredInt64Group, stringGroup, booleanGroup, int64Group);
+    apiInstance.TestGroupParametersWithHttpInfo(requiredBooleanGroup, requiredInt64Group, requiredStringGroup, booleanGroup, int64Group, stringGroup);
 }
 catch (ApiException e)
 {
@@ -1357,12 +1357,12 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **requiredStringGroup** | **int** | Required String in group parameters |  |
 | **requiredBooleanGroup** | **bool** | Required Boolean in group parameters |  |
 | **requiredInt64Group** | **long** | Required Integer in group parameters |  |
-| **stringGroup** | **int** | String in group parameters | [optional]  |
+| **requiredStringGroup** | **int** | Required String in group parameters |  |
 | **booleanGroup** | **bool** | Boolean in group parameters | [optional]  |
 | **int64Group** | **long** | Integer in group parameters | [optional]  |
+| **stringGroup** | **int** | String in group parameters | [optional]  |
 
 ### Return type
 
@@ -1644,7 +1644,7 @@ No authorization required
 
 <a id="testqueryparametercollectionformat"></a>
 # **TestQueryParameterCollectionFormat**
-> void TestQueryParameterCollectionFormat (List<string> pipe, List<string> ioutil, List<string> http, List<string> url, List<string> context, string requiredNotNullable, string requiredNullable, string notRequiredNotNullable = null, string notRequiredNullable = null)
+> void TestQueryParameterCollectionFormat (List<string> context, List<string> http, List<string> ioutil, List<string> pipe, string requiredNotNullable, List<string> url, string notRequiredNotNullable = null, string notRequiredNullable = null, string requiredNullable)
 
 
 
@@ -1667,19 +1667,19 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new FakeApi(config);
-            var pipe = new List<string>(); // List<string> | 
-            var ioutil = new List<string>(); // List<string> | 
-            var http = new List<string>(); // List<string> | 
-            var url = new List<string>(); // List<string> | 
             var context = new List<string>(); // List<string> | 
+            var http = new List<string>(); // List<string> | 
+            var ioutil = new List<string>(); // List<string> | 
+            var pipe = new List<string>(); // List<string> | 
             var requiredNotNullable = "requiredNotNullable_example";  // string | 
-            var requiredNullable = "requiredNullable_example";  // string | 
+            var url = new List<string>(); // List<string> | 
             var notRequiredNotNullable = "notRequiredNotNullable_example";  // string |  (optional) 
             var notRequiredNullable = "notRequiredNullable_example";  // string |  (optional) 
+            var requiredNullable = "requiredNullable_example";  // string | 
 
             try
             {
-                apiInstance.TestQueryParameterCollectionFormat(pipe, ioutil, http, url, context, requiredNotNullable, requiredNullable, notRequiredNotNullable, notRequiredNullable);
+                apiInstance.TestQueryParameterCollectionFormat(context, http, ioutil, pipe, requiredNotNullable, url, notRequiredNotNullable, notRequiredNullable, requiredNullable);
             }
             catch (ApiException  e)
             {
@@ -1698,7 +1698,7 @@ This returns an ApiResponse object which contains the response data, status code
 ```csharp
 try
 {
-    apiInstance.TestQueryParameterCollectionFormatWithHttpInfo(pipe, ioutil, http, url, context, requiredNotNullable, requiredNullable, notRequiredNotNullable, notRequiredNullable);
+    apiInstance.TestQueryParameterCollectionFormatWithHttpInfo(context, http, ioutil, pipe, requiredNotNullable, url, notRequiredNotNullable, notRequiredNullable, requiredNullable);
 }
 catch (ApiException e)
 {
@@ -1712,15 +1712,15 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **pipe** | [**List&lt;string&gt;**](string.md) |  |  |
-| **ioutil** | [**List&lt;string&gt;**](string.md) |  |  |
-| **http** | [**List&lt;string&gt;**](string.md) |  |  |
-| **url** | [**List&lt;string&gt;**](string.md) |  |  |
 | **context** | [**List&lt;string&gt;**](string.md) |  |  |
+| **http** | [**List&lt;string&gt;**](string.md) |  |  |
+| **ioutil** | [**List&lt;string&gt;**](string.md) |  |  |
+| **pipe** | [**List&lt;string&gt;**](string.md) |  |  |
 | **requiredNotNullable** | **string** |  |  |
-| **requiredNullable** | **string** |  |  |
+| **url** | [**List&lt;string&gt;**](string.md) |  |  |
 | **notRequiredNotNullable** | **string** |  | [optional]  |
 | **notRequiredNullable** | **string** |  | [optional]  |
+| **requiredNullable** | **string** |  |  |
 
 ### Return type
 

samples/client/petstore/csharp/generichost/net8/SourceGeneration/docs/apis/UserApi.md

@@ -453,7 +453,7 @@ No authorization required
 
 <a id="loginuser"></a>
 # **LoginUser**
-> string LoginUser (string username, string password)
+> string LoginUser (string password, string username)
 
 Logs user into the system
 
@@ -474,13 +474,13 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new UserApi(config);
-            var username = "username_example";  // string | The user name for login
             var password = "password_example";  // string | The password for login in clear text
+            var username = "username_example";  // string | The user name for login
 
             try
             {
                 // Logs user into the system
-                string result = apiInstance.LoginUser(username, password);
+                string result = apiInstance.LoginUser(password, username);
                 Debug.WriteLine(result);
             }
             catch (ApiException  e)
@@ -501,7 +501,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Logs user into the system
-    ApiResponse<string> response = apiInstance.LoginUserWithHttpInfo(username, password);
+    ApiResponse<string> response = apiInstance.LoginUserWithHttpInfo(password, username);
     Debug.Write("Status Code: " + response.StatusCode);
     Debug.Write("Response Headers: " + response.Headers);
     Debug.Write("Response Body: " + response.Data);
@@ -518,8 +518,8 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **username** | **string** | The user name for login |  |
 | **password** | **string** | The password for login in clear text |  |
+| **username** | **string** | The user name for login |  |
 
 ### Return type
 
@@ -625,7 +625,7 @@ No authorization required
 
 <a id="updateuser"></a>
 # **UpdateUser**
-> void UpdateUser (string username, User user)
+> void UpdateUser (User user, string username)
 
 Updated user
 
@@ -648,13 +648,13 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new UserApi(config);
-            var username = "username_example";  // string | name that need to be deleted
             var user = new User(); // User | Updated user object
+            var username = "username_example";  // string | name that need to be deleted
 
             try
             {
                 // Updated user
-                apiInstance.UpdateUser(username, user);
+                apiInstance.UpdateUser(user, username);
             }
             catch (ApiException  e)
             {
@@ -674,7 +674,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Updated user
-    apiInstance.UpdateUserWithHttpInfo(username, user);
+    apiInstance.UpdateUserWithHttpInfo(user, username);
 }
 catch (ApiException e)
 {
@@ -688,8 +688,8 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **username** | **string** | name that need to be deleted |  |
 | **user** | [**User**](User.md) | Updated user object |  |
+| **username** | **string** | name that need to be deleted |  |
 
 ### Return type
 

samples/client/petstore/csharp/generichost/net8/SourceGeneration/src/Org.OpenAPITools.Test/Api/FakeApiTests.cs

@@ -193,20 +193,20 @@ namespace Org.OpenAPITools.Test.Api
         public async Task TestEndpointParametersAsyncTest()
         {
             decimal number = default!;
-            double varDouble = default!;
             string patternWithoutDelimiter = default!;
             byte[] varByte = default!;
-            Client.Option<int> integer = default!;
-            Client.Option<int> int32 = default!;
-            Client.Option<long> int64 = default!;
-            Client.Option<float> varFloat = default!;
-            Client.Option<string> varString = default!;
+            double varDouble = default!;
             Client.Option<System.IO.Stream> binary = default!;
+            Client.Option<string> callback = default!;
             Client.Option<DateOnly> date = default!;
             Client.Option<DateTime> dateTime = default!;
+            Client.Option<int> int32 = default!;
+            Client.Option<long> int64 = default!;
+            Client.Option<int> integer = default!;
             Client.Option<string> password = default!;
-            Client.Option<string> callback = default!;
-            await _instance.TestEndpointParametersAsync(number, varDouble, patternWithoutDelimiter, varByte, integer, int32, int64, varFloat, varString, binary, date, dateTime, password, callback);
+            Client.Option<float> varFloat = default!;
+            Client.Option<string> varString = default!;
+            await _instance.TestEndpointParametersAsync(number, patternWithoutDelimiter, varByte, varDouble, binary, callback, date, dateTime, int32, int64, integer, password, varFloat, varString);
         }
 
         /// <summary>
@@ -215,15 +215,15 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task TestEnumParametersAsyncTest()
         {
-            Client.Option<List<string>> enumHeaderStringArray = default!;
-            Client.Option<string> enumHeaderString = default!;
-            Client.Option<List<string>> enumQueryStringArray = default!;
-            Client.Option<string> enumQueryString = default!;
-            Client.Option<int> enumQueryInteger = default!;
-            Client.Option<double> enumQueryDouble = default!;
-            Client.Option<List<string>> enumFormStringArray = default!;
             Client.Option<string> enumFormString = default!;
-            await _instance.TestEnumParametersAsync(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
+            Client.Option<List<string>> enumFormStringArray = default!;
+            Client.Option<string> enumHeaderString = default!;
+            Client.Option<List<string>> enumHeaderStringArray = default!;
+            Client.Option<double> enumQueryDouble = default!;
+            Client.Option<int> enumQueryInteger = default!;
+            Client.Option<string> enumQueryString = default!;
+            Client.Option<List<string>> enumQueryStringArray = default!;
+            await _instance.TestEnumParametersAsync(enumFormString, enumFormStringArray, enumHeaderString, enumHeaderStringArray, enumQueryDouble, enumQueryInteger, enumQueryString, enumQueryStringArray);
         }
 
         /// <summary>
@@ -232,13 +232,13 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task TestGroupParametersAsyncTest()
         {
-            int requiredStringGroup = default!;
             bool requiredBooleanGroup = default!;
             long requiredInt64Group = default!;
-            Client.Option<int> stringGroup = default!;
+            int requiredStringGroup = default!;
             Client.Option<bool> booleanGroup = default!;
             Client.Option<long> int64Group = default!;
-            await _instance.TestGroupParametersAsync(requiredStringGroup, requiredBooleanGroup, requiredInt64Group, stringGroup, booleanGroup, int64Group);
+            Client.Option<int> stringGroup = default!;
+            await _instance.TestGroupParametersAsync(requiredBooleanGroup, requiredInt64Group, requiredStringGroup, booleanGroup, int64Group, stringGroup);
         }
 
         /// <summary>
@@ -278,16 +278,16 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task TestQueryParameterCollectionFormatAsyncTest()
         {
-            List<string> pipe = default!;
-            List<string> ioutil = default!;
-            List<string> http = default!;
-            List<string> url = default!;
             List<string> context = default!;
+            List<string> http = default!;
+            List<string> ioutil = default!;
+            List<string> pipe = default!;
             string requiredNotNullable = default!;
-            string? requiredNullable = default!;
+            List<string> url = default!;
             Client.Option<string> notRequiredNotNullable = default!;
             Client.Option<string?> notRequiredNullable = default!;
-            await _instance.TestQueryParameterCollectionFormatAsync(pipe, ioutil, http, url, context, requiredNotNullable, requiredNullable, notRequiredNotNullable, notRequiredNullable);
+            string? requiredNullable = default!;
+            await _instance.TestQueryParameterCollectionFormatAsync(context, http, ioutil, pipe, requiredNotNullable, url, notRequiredNotNullable, notRequiredNullable, requiredNullable);
         }
 
         /// <summary>

samples/client/petstore/csharp/generichost/net8/SourceGeneration/src/Org.OpenAPITools.Test/Api/UserApiTests.cs

@@ -108,9 +108,9 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task LoginUserAsyncTest()
         {
-            string username = default!;
             string password = default!;
-            var response = await _instance.LoginUserAsync(username, password);
+            string username = default!;
+            var response = await _instance.LoginUserAsync(password, username);
             var model = response.Ok();
             Assert.IsType<string>(model);
         }
@@ -130,9 +130,9 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task UpdateUserAsyncTest()
         {
-            string username = default!;
             User user = default!;
-            await _instance.UpdateUserAsync(username, user);
+            string username = default!;
+            await _instance.UpdateUserAsync(user, username);
         }
     }
 }

samples/client/petstore/csharp/generichost/net8/SourceGeneration/src/Org.OpenAPITools/Api/UserApi.cs

@@ -158,11 +158,11 @@ namespace Org.OpenAPITools.Api
         /// 
         /// </remarks>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        Task<ILoginUserApiResponse> LoginUserAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default);
+        Task<ILoginUserApiResponse> LoginUserAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Logs user into the system
@@ -170,11 +170,11 @@ namespace Org.OpenAPITools.Api
         /// <remarks>
         /// 
         /// </remarks>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>?&gt;</returns>
-        Task<ILoginUserApiResponse?> LoginUserOrDefaultAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default);
+        Task<ILoginUserApiResponse?> LoginUserOrDefaultAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Logs out current logged in user session
@@ -204,11 +204,11 @@ namespace Org.OpenAPITools.Api
         /// This can only be done by the logged in user.
         /// </remarks>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        Task<IUpdateUserApiResponse> UpdateUserAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default);
+        Task<IUpdateUserApiResponse> UpdateUserAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Updated user
@@ -216,11 +216,11 @@ namespace Org.OpenAPITools.Api
         /// <remarks>
         /// This can only be done by the logged in user.
         /// </remarks>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>?&gt;</returns>
-        Task<IUpdateUserApiResponse?> UpdateUserOrDefaultAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default);
+        Task<IUpdateUserApiResponse?> UpdateUserOrDefaultAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default);
     }
 
     /// <summary>
@@ -1634,33 +1634,33 @@ namespace Org.OpenAPITools.Api
             partial void OnDeserializationError(ref bool suppressDefaultLog, Exception exception, HttpStatusCode httpStatusCode);
         }
 
-        partial void FormatLoginUser(ref string username, ref string password);
+        partial void FormatLoginUser(ref string password, ref string username);
 
         /// <summary>
         /// Validates the request parameters
         /// </summary>
-        /// <param name="username"></param>
         /// <param name="password"></param>
+        /// <param name="username"></param>
         /// <returns></returns>
-        private void ValidateLoginUser(string username, string password)
+        private void ValidateLoginUser(string password, string username)
         {
-            if (username == null)
-                throw new ArgumentNullException(nameof(username));
-
             if (password == null)
                 throw new ArgumentNullException(nameof(password));
+
+            if (username == null)
+                throw new ArgumentNullException(nameof(username));
         }
 
         /// <summary>
         /// Processes the server response
         /// </summary>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        private void AfterLoginUserDefaultImplementation(ILoginUserApiResponse apiResponseLocalVar, string username, string password)
+        /// <param name="username"></param>
+        private void AfterLoginUserDefaultImplementation(ILoginUserApiResponse apiResponseLocalVar, string password, string username)
         {
             bool suppressDefaultLog = false;
-            AfterLoginUser(ref suppressDefaultLog, apiResponseLocalVar, username, password);
+            AfterLoginUser(ref suppressDefaultLog, apiResponseLocalVar, password, username);
             if (!suppressDefaultLog)
                 Logger.LogInformation("{0,-9} | {1} | {3}", (apiResponseLocalVar.DownloadedAt - apiResponseLocalVar.RequestedAt).TotalSeconds, apiResponseLocalVar.StatusCode, apiResponseLocalVar.Path);
         }
@@ -1670,9 +1670,9 @@ namespace Org.OpenAPITools.Api
         /// </summary>
         /// <param name="suppressDefaultLog"></param>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        partial void AfterLoginUser(ref bool suppressDefaultLog, ILoginUserApiResponse apiResponseLocalVar, string username, string password);
+        /// <param name="username"></param>
+        partial void AfterLoginUser(ref bool suppressDefaultLog, ILoginUserApiResponse apiResponseLocalVar, string password, string username);
 
         /// <summary>
         /// Logs exceptions that occur while retrieving the server response
@@ -1680,12 +1680,12 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        private void OnErrorLoginUserDefaultImplementation(Exception exception, string pathFormat, string path, string username, string password)
+        /// <param name="username"></param>
+        private void OnErrorLoginUserDefaultImplementation(Exception exception, string pathFormat, string path, string password, string username)
         {
             bool suppressDefaultLog = false;
-            OnErrorLoginUser(ref suppressDefaultLog, exception, pathFormat, path, username, password);
+            OnErrorLoginUser(ref suppressDefaultLog, exception, pathFormat, path, password, username);
             if (!suppressDefaultLog)
                 Logger.LogError(exception, "An error occurred while sending the request to the server.");
         }
@@ -1697,22 +1697,22 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="password"></param>
-        partial void OnErrorLoginUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, string username, string password);
+        /// <param name="username"></param>
+        partial void OnErrorLoginUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, string password, string username);
 
         /// <summary>
         /// Logs user into the system 
         /// </summary>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        public async Task<ILoginUserApiResponse?> LoginUserOrDefaultAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<ILoginUserApiResponse?> LoginUserOrDefaultAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             try
             {
-                return await LoginUserAsync(username, password, cancellationToken).ConfigureAwait(false);
+                return await LoginUserAsync(password, username, cancellationToken).ConfigureAwait(false);
             }
             catch (Exception)
             {
@@ -1724,19 +1724,19 @@ namespace Org.OpenAPITools.Api
         /// Logs user into the system 
         /// </summary>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">The user name for login</param>
         /// <param name="password">The password for login in clear text</param>
+        /// <param name="username">The user name for login</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="ILoginUserApiResponse"/>&gt;</returns>
-        public async Task<ILoginUserApiResponse> LoginUserAsync(string username, string password, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<ILoginUserApiResponse> LoginUserAsync(string password, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             UriBuilder uriBuilderLocalVar = new UriBuilder();
 
             try
             {
-                ValidateLoginUser(username, password);
+                ValidateLoginUser(password, username);
 
-                FormatLoginUser(ref username, ref password);
+                FormatLoginUser(ref password, ref username);
 
                 using (HttpRequestMessage httpRequestMessageLocalVar = new HttpRequestMessage())
                 {
@@ -1747,8 +1747,8 @@ namespace Org.OpenAPITools.Api
 
                     System.Collections.Specialized.NameValueCollection parseQueryStringLocalVar = System.Web.HttpUtility.ParseQueryString(string.Empty);
 
-                    parseQueryStringLocalVar["username"] = ClientUtils.ParameterToString(username);
                     parseQueryStringLocalVar["password"] = ClientUtils.ParameterToString(password);
+                    parseQueryStringLocalVar["username"] = ClientUtils.ParameterToString(username);
 
                     uriBuilderLocalVar.Query = parseQueryStringLocalVar.ToString();
 
@@ -1776,7 +1776,7 @@ namespace Org.OpenAPITools.Api
 
                         LoginUserApiResponse apiResponseLocalVar = new(apiResponseLoggerLocalVar, httpRequestMessageLocalVar, httpResponseMessageLocalVar, responseContentLocalVar, "/user/login", requestedAtLocalVar, _jsonSerializerOptions);
 
-                        AfterLoginUserDefaultImplementation(apiResponseLocalVar, username, password);
+                        AfterLoginUserDefaultImplementation(apiResponseLocalVar, password, username);
 
                         Events.ExecuteOnLoginUser(apiResponseLocalVar);
 
@@ -1813,7 +1813,7 @@ namespace Org.OpenAPITools.Api
             }
             catch(Exception e)
             {
-                OnErrorLoginUserDefaultImplementation(e, "/user/login", uriBuilderLocalVar.Path, username, password);
+                OnErrorLoginUserDefaultImplementation(e, "/user/login", uriBuilderLocalVar.Path, password, username);
                 Events.ExecuteOnErrorLoginUser(e);
                 throw;
             }
@@ -2055,33 +2055,33 @@ namespace Org.OpenAPITools.Api
             partial void OnDeserializationError(ref bool suppressDefaultLog, Exception exception, HttpStatusCode httpStatusCode);
         }
 
-        partial void FormatUpdateUser(ref string username, User user);
+        partial void FormatUpdateUser(User user, ref string username);
 
         /// <summary>
         /// Validates the request parameters
         /// </summary>
-        /// <param name="username"></param>
         /// <param name="user"></param>
+        /// <param name="username"></param>
         /// <returns></returns>
-        private void ValidateUpdateUser(string username, User user)
+        private void ValidateUpdateUser(User user, string username)
         {
-            if (username == null)
-                throw new ArgumentNullException(nameof(username));
-
             if (user == null)
                 throw new ArgumentNullException(nameof(user));
+
+            if (username == null)
+                throw new ArgumentNullException(nameof(username));
         }
 
         /// <summary>
         /// Processes the server response
         /// </summary>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        private void AfterUpdateUserDefaultImplementation(IUpdateUserApiResponse apiResponseLocalVar, string username, User user)
+        /// <param name="username"></param>
+        private void AfterUpdateUserDefaultImplementation(IUpdateUserApiResponse apiResponseLocalVar, User user, string username)
         {
             bool suppressDefaultLog = false;
-            AfterUpdateUser(ref suppressDefaultLog, apiResponseLocalVar, username, user);
+            AfterUpdateUser(ref suppressDefaultLog, apiResponseLocalVar, user, username);
             if (!suppressDefaultLog)
                 Logger.LogInformation("{0,-9} | {1} | {3}", (apiResponseLocalVar.DownloadedAt - apiResponseLocalVar.RequestedAt).TotalSeconds, apiResponseLocalVar.StatusCode, apiResponseLocalVar.Path);
         }
@@ -2091,9 +2091,9 @@ namespace Org.OpenAPITools.Api
         /// </summary>
         /// <param name="suppressDefaultLog"></param>
         /// <param name="apiResponseLocalVar"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        partial void AfterUpdateUser(ref bool suppressDefaultLog, IUpdateUserApiResponse apiResponseLocalVar, string username, User user);
+        /// <param name="username"></param>
+        partial void AfterUpdateUser(ref bool suppressDefaultLog, IUpdateUserApiResponse apiResponseLocalVar, User user, string username);
 
         /// <summary>
         /// Logs exceptions that occur while retrieving the server response
@@ -2101,12 +2101,12 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        private void OnErrorUpdateUserDefaultImplementation(Exception exception, string pathFormat, string path, string username, User user)
+        /// <param name="username"></param>
+        private void OnErrorUpdateUserDefaultImplementation(Exception exception, string pathFormat, string path, User user, string username)
         {
             bool suppressDefaultLog = false;
-            OnErrorUpdateUser(ref suppressDefaultLog, exception, pathFormat, path, username, user);
+            OnErrorUpdateUser(ref suppressDefaultLog, exception, pathFormat, path, user, username);
             if (!suppressDefaultLog)
                 Logger.LogError(exception, "An error occurred while sending the request to the server.");
         }
@@ -2118,22 +2118,22 @@ namespace Org.OpenAPITools.Api
         /// <param name="exception"></param>
         /// <param name="pathFormat"></param>
         /// <param name="path"></param>
-        /// <param name="username"></param>
         /// <param name="user"></param>
-        partial void OnErrorUpdateUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, string username, User user);
+        /// <param name="username"></param>
+        partial void OnErrorUpdateUser(ref bool suppressDefaultLog, Exception exception, string pathFormat, string path, User user, string username);
 
         /// <summary>
         /// Updated user This can only be done by the logged in user.
         /// </summary>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        public async Task<IUpdateUserApiResponse?> UpdateUserOrDefaultAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<IUpdateUserApiResponse?> UpdateUserOrDefaultAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             try
             {
-                return await UpdateUserAsync(username, user, cancellationToken).ConfigureAwait(false);
+                return await UpdateUserAsync(user, username, cancellationToken).ConfigureAwait(false);
             }
             catch (Exception)
             {
@@ -2145,19 +2145,19 @@ namespace Org.OpenAPITools.Api
         /// Updated user This can only be done by the logged in user.
         /// </summary>
         /// <exception cref="ApiException">Thrown when fails to make API call</exception>
-        /// <param name="username">name that need to be deleted</param>
         /// <param name="user">Updated user object</param>
+        /// <param name="username">name that need to be deleted</param>
         /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
         /// <returns><see cref="Task"/>&lt;<see cref="IUpdateUserApiResponse"/>&gt;</returns>
-        public async Task<IUpdateUserApiResponse> UpdateUserAsync(string username, User user, System.Threading.CancellationToken cancellationToken = default)
+        public async Task<IUpdateUserApiResponse> UpdateUserAsync(User user, string username, System.Threading.CancellationToken cancellationToken = default)
         {
             UriBuilder uriBuilderLocalVar = new UriBuilder();
 
             try
             {
-                ValidateUpdateUser(username, user);
+                ValidateUpdateUser(user, username);
 
-                FormatUpdateUser(ref username, user);
+                FormatUpdateUser(user, ref username);
 
                 using (HttpRequestMessage httpRequestMessageLocalVar = new HttpRequestMessage())
                 {
@@ -2194,7 +2194,7 @@ namespace Org.OpenAPITools.Api
 
                         UpdateUserApiResponse apiResponseLocalVar = new(apiResponseLoggerLocalVar, httpRequestMessageLocalVar, httpResponseMessageLocalVar, responseContentLocalVar, "/user/{username}", requestedAtLocalVar, _jsonSerializerOptions);
 
-                        AfterUpdateUserDefaultImplementation(apiResponseLocalVar, username, user);
+                        AfterUpdateUserDefaultImplementation(apiResponseLocalVar, user, username);
 
                         Events.ExecuteOnUpdateUser(apiResponseLocalVar);
 
@@ -2204,7 +2204,7 @@ namespace Org.OpenAPITools.Api
             }
             catch(Exception e)
             {
-                OnErrorUpdateUserDefaultImplementation(e, "/user/{username}", uriBuilderLocalVar.Path, username, user);
+                OnErrorUpdateUserDefaultImplementation(e, "/user/{username}", uriBuilderLocalVar.Path, user, username);
                 Events.ExecuteOnErrorUpdateUser(e);
                 throw;
             }

samples/client/petstore/csharp/generichost/standard2.0/Petstore/docs/apis/FakeApi.md

@@ -1067,7 +1067,7 @@ No authorization required
 
 <a id="testendpointparameters"></a>
 # **TestEndpointParameters**
-> void TestEndpointParameters (decimal number, double varDouble, string patternWithoutDelimiter, byte[] varByte, int integer = null, int int32 = null, long int64 = null, float varFloat = null, string varString = null, System.IO.Stream binary = null, DateTime date = null, DateTime dateTime = null, string password = null, string callback = null)
+> void TestEndpointParameters (decimal number, string patternWithoutDelimiter, byte[] varByte, double varDouble, System.IO.Stream binary = null, string callback = null, DateTime date = null, DateTime dateTime = null, int int32 = null, long int64 = null, int integer = null, string password = null, float varFloat = null, string varString = null)
 
 Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
 
@@ -1095,24 +1095,24 @@ namespace Example
 
             var apiInstance = new FakeApi(config);
             var number = 8.14D;  // decimal | None
-            var varDouble = 1.2D;  // double | None
             var patternWithoutDelimiter = "patternWithoutDelimiter_example";  // string | None
             var varByte = System.Text.Encoding.ASCII.GetBytes("BYTE_ARRAY_DATA_HERE");  // byte[] | None
-            var integer = 56;  // int | None (optional) 
-            var int32 = 56;  // int | None (optional) 
-            var int64 = 789L;  // long | None (optional) 
-            var varFloat = 3.4F;  // float | None (optional) 
-            var varString = "varString_example";  // string | None (optional) 
+            var varDouble = 1.2D;  // double | None
             var binary = new System.IO.MemoryStream(System.IO.File.ReadAllBytes("/path/to/file.txt"));  // System.IO.Stream | None (optional) 
+            var callback = "callback_example";  // string | None (optional) 
             var date = DateTime.Parse("2013-10-20");  // DateTime | None (optional) 
             var dateTime = DateTime.Parse(""2010-02-01T10:20:10.111110+01:00"");  // DateTime | None (optional)  (default to "2010-02-01T10:20:10.111110+01:00")
+            var int32 = 56;  // int | None (optional) 
+            var int64 = 789L;  // long | None (optional) 
+            var integer = 56;  // int | None (optional) 
             var password = "password_example";  // string | None (optional) 
-            var callback = "callback_example";  // string | None (optional) 
+            var varFloat = 3.4F;  // float | None (optional) 
+            var varString = "varString_example";  // string | None (optional) 
 
             try
             {
                 // Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
-                apiInstance.TestEndpointParameters(number, varDouble, patternWithoutDelimiter, varByte, integer, int32, int64, varFloat, varString, binary, date, dateTime, password, callback);
+                apiInstance.TestEndpointParameters(number, patternWithoutDelimiter, varByte, varDouble, binary, callback, date, dateTime, int32, int64, integer, password, varFloat, varString);
             }
             catch (ApiException  e)
             {
@@ -1132,7 +1132,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
-    apiInstance.TestEndpointParametersWithHttpInfo(number, varDouble, patternWithoutDelimiter, varByte, integer, int32, int64, varFloat, varString, binary, date, dateTime, password, callback);
+    apiInstance.TestEndpointParametersWithHttpInfo(number, patternWithoutDelimiter, varByte, varDouble, binary, callback, date, dateTime, int32, int64, integer, password, varFloat, varString);
 }
 catch (ApiException e)
 {
@@ -1147,19 +1147,19 @@ catch (ApiException e)
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
 | **number** | **decimal** | None |  |
-| **varDouble** | **double** | None |  |
 | **patternWithoutDelimiter** | **string** | None |  |
 | **varByte** | **byte[]** | None |  |
-| **integer** | **int** | None | [optional]  |
-| **int32** | **int** | None | [optional]  |
-| **int64** | **long** | None | [optional]  |
-| **varFloat** | **float** | None | [optional]  |
-| **varString** | **string** | None | [optional]  |
+| **varDouble** | **double** | None |  |
 | **binary** | **System.IO.Stream****System.IO.Stream** | None | [optional]  |
+| **callback** | **string** | None | [optional]  |
 | **date** | **DateTime** | None | [optional]  |
 | **dateTime** | **DateTime** | None | [optional] [default to &quot;2010-02-01T10:20:10.111110+01:00&quot;] |
+| **int32** | **int** | None | [optional]  |
+| **int64** | **long** | None | [optional]  |
+| **integer** | **int** | None | [optional]  |
 | **password** | **string** | None | [optional]  |
-| **callback** | **string** | None | [optional]  |
+| **varFloat** | **float** | None | [optional]  |
+| **varString** | **string** | None | [optional]  |
 
 ### Return type
 
@@ -1185,7 +1185,7 @@ void (empty response body)
 
 <a id="testenumparameters"></a>
 # **TestEnumParameters**
-> void TestEnumParameters (List<string> enumHeaderStringArray = null, string enumHeaderString = null, List<string> enumQueryStringArray = null, string enumQueryString = null, int enumQueryInteger = null, double enumQueryDouble = null, List<string> enumFormStringArray = null, string enumFormString = null)
+> void TestEnumParameters (string enumFormString = null, List<string> enumFormStringArray = null, string enumHeaderString = null, List<string> enumHeaderStringArray = null, double enumQueryDouble = null, int enumQueryInteger = null, string enumQueryString = null, List<string> enumQueryStringArray = null)
 
 To test enum parameters
 
@@ -1208,19 +1208,19 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new FakeApi(config);
-            var enumHeaderStringArray = new List<string>(); // List<string> | Header parameter enum test (string array) (optional) 
-            var enumHeaderString = "_abc";  // string | Header parameter enum test (string) (optional)  (default to -efg)
-            var enumQueryStringArray = new List<string>(); // List<string> | Query parameter enum test (string array) (optional) 
-            var enumQueryString = "_abc";  // string | Query parameter enum test (string) (optional)  (default to -efg)
-            var enumQueryInteger = 1;  // int | Query parameter enum test (double) (optional) 
-            var enumQueryDouble = 1.1D;  // double | Query parameter enum test (double) (optional) 
-            var enumFormStringArray = new List<string>(); // List<string> | Form parameter enum test (string array) (optional)  (default to $)
             var enumFormString = "_abc";  // string | Form parameter enum test (string) (optional)  (default to -efg)
+            var enumFormStringArray = new List<string>(); // List<string> | Form parameter enum test (string array) (optional)  (default to $)
+            var enumHeaderString = "_abc";  // string | Header parameter enum test (string) (optional)  (default to -efg)
+            var enumHeaderStringArray = new List<string>(); // List<string> | Header parameter enum test (string array) (optional) 
+            var enumQueryDouble = 1.1D;  // double | Query parameter enum test (double) (optional) 
+            var enumQueryInteger = 1;  // int | Query parameter enum test (double) (optional) 
+            var enumQueryString = "_abc";  // string | Query parameter enum test (string) (optional)  (default to -efg)
+            var enumQueryStringArray = new List<string>(); // List<string> | Query parameter enum test (string array) (optional) 
 
             try
             {
                 // To test enum parameters
-                apiInstance.TestEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
+                apiInstance.TestEnumParameters(enumFormString, enumFormStringArray, enumHeaderString, enumHeaderStringArray, enumQueryDouble, enumQueryInteger, enumQueryString, enumQueryStringArray);
             }
             catch (ApiException  e)
             {
@@ -1240,7 +1240,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // To test enum parameters
-    apiInstance.TestEnumParametersWithHttpInfo(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
+    apiInstance.TestEnumParametersWithHttpInfo(enumFormString, enumFormStringArray, enumHeaderString, enumHeaderStringArray, enumQueryDouble, enumQueryInteger, enumQueryString, enumQueryStringArray);
 }
 catch (ApiException e)
 {
@@ -1254,14 +1254,14 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **enumHeaderStringArray** | [**List&lt;string&gt;**](string.md) | Header parameter enum test (string array) | [optional]  |
-| **enumHeaderString** | **string** | Header parameter enum test (string) | [optional] [default to -efg] |
-| **enumQueryStringArray** | [**List&lt;string&gt;**](string.md) | Query parameter enum test (string array) | [optional]  |
-| **enumQueryString** | **string** | Query parameter enum test (string) | [optional] [default to -efg] |
-| **enumQueryInteger** | **int** | Query parameter enum test (double) | [optional]  |
-| **enumQueryDouble** | **double** | Query parameter enum test (double) | [optional]  |
-| **enumFormStringArray** | [**List&lt;string&gt;**](string.md) | Form parameter enum test (string array) | [optional] [default to $] |
 | **enumFormString** | **string** | Form parameter enum test (string) | [optional] [default to -efg] |
+| **enumFormStringArray** | [**List&lt;string&gt;**](string.md) | Form parameter enum test (string array) | [optional] [default to $] |
+| **enumHeaderString** | **string** | Header parameter enum test (string) | [optional] [default to -efg] |
+| **enumHeaderStringArray** | [**List&lt;string&gt;**](string.md) | Header parameter enum test (string array) | [optional]  |
+| **enumQueryDouble** | **double** | Query parameter enum test (double) | [optional]  |
+| **enumQueryInteger** | **int** | Query parameter enum test (double) | [optional]  |
+| **enumQueryString** | **string** | Query parameter enum test (string) | [optional] [default to -efg] |
+| **enumQueryStringArray** | [**List&lt;string&gt;**](string.md) | Query parameter enum test (string array) | [optional]  |
 
 ### Return type
 
@@ -1287,7 +1287,7 @@ No authorization required
 
 <a id="testgroupparameters"></a>
 # **TestGroupParameters**
-> void TestGroupParameters (int requiredStringGroup, bool requiredBooleanGroup, long requiredInt64Group, int stringGroup = null, bool booleanGroup = null, long int64Group = null)
+> void TestGroupParameters (bool requiredBooleanGroup, long requiredInt64Group, int requiredStringGroup, bool booleanGroup = null, long int64Group = null, int stringGroup = null)
 
 Fake endpoint to test group parameters (optional)
 
@@ -1313,17 +1313,17 @@ namespace Example
             config.AccessToken = "YOUR_BEARER_TOKEN";
 
             var apiInstance = new FakeApi(config);
-            var requiredStringGroup = 56;  // int | Required String in group parameters
             var requiredBooleanGroup = true;  // bool | Required Boolean in group parameters
             var requiredInt64Group = 789L;  // long | Required Integer in group parameters
-            var stringGroup = 56;  // int | String in group parameters (optional) 
+            var requiredStringGroup = 56;  // int | Required String in group parameters
             var booleanGroup = true;  // bool | Boolean in group parameters (optional) 
             var int64Group = 789L;  // long | Integer in group parameters (optional) 
+            var stringGroup = 56;  // int | String in group parameters (optional) 
 
             try
             {
                 // Fake endpoint to test group parameters (optional)
-                apiInstance.TestGroupParameters(requiredStringGroup, requiredBooleanGroup, requiredInt64Group, stringGroup, booleanGroup, int64Group);
+                apiInstance.TestGroupParameters(requiredBooleanGroup, requiredInt64Group, requiredStringGroup, booleanGroup, int64Group, stringGroup);
             }
             catch (ApiException  e)
             {
@@ -1343,7 +1343,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Fake endpoint to test group parameters (optional)
-    apiInstance.TestGroupParametersWithHttpInfo(requiredStringGroup, requiredBooleanGroup, requiredInt64Group, stringGroup, booleanGroup, int64Group);
+    apiInstance.TestGroupParametersWithHttpInfo(requiredBooleanGroup, requiredInt64Group, requiredStringGroup, booleanGroup, int64Group, stringGroup);
 }
 catch (ApiException e)
 {
@@ -1357,12 +1357,12 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **requiredStringGroup** | **int** | Required String in group parameters |  |
 | **requiredBooleanGroup** | **bool** | Required Boolean in group parameters |  |
 | **requiredInt64Group** | **long** | Required Integer in group parameters |  |
-| **stringGroup** | **int** | String in group parameters | [optional]  |
+| **requiredStringGroup** | **int** | Required String in group parameters |  |
 | **booleanGroup** | **bool** | Boolean in group parameters | [optional]  |
 | **int64Group** | **long** | Integer in group parameters | [optional]  |
+| **stringGroup** | **int** | String in group parameters | [optional]  |
 
 ### Return type
 
@@ -1644,7 +1644,7 @@ No authorization required
 
 <a id="testqueryparametercollectionformat"></a>
 # **TestQueryParameterCollectionFormat**
-> void TestQueryParameterCollectionFormat (List<string> pipe, List<string> ioutil, List<string> http, List<string> url, List<string> context, string requiredNotNullable, string requiredNullable, string notRequiredNotNullable = null, string notRequiredNullable = null)
+> void TestQueryParameterCollectionFormat (List<string> context, List<string> http, List<string> ioutil, List<string> pipe, string requiredNotNullable, List<string> url, string notRequiredNotNullable = null, string notRequiredNullable = null, string requiredNullable)
 
 
 
@@ -1667,19 +1667,19 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new FakeApi(config);
-            var pipe = new List<string>(); // List<string> | 
-            var ioutil = new List<string>(); // List<string> | 
-            var http = new List<string>(); // List<string> | 
-            var url = new List<string>(); // List<string> | 
             var context = new List<string>(); // List<string> | 
+            var http = new List<string>(); // List<string> | 
+            var ioutil = new List<string>(); // List<string> | 
+            var pipe = new List<string>(); // List<string> | 
             var requiredNotNullable = "requiredNotNullable_example";  // string | 
-            var requiredNullable = "requiredNullable_example";  // string | 
+            var url = new List<string>(); // List<string> | 
             var notRequiredNotNullable = "notRequiredNotNullable_example";  // string |  (optional) 
             var notRequiredNullable = "notRequiredNullable_example";  // string |  (optional) 
+            var requiredNullable = "requiredNullable_example";  // string | 
 
             try
             {
-                apiInstance.TestQueryParameterCollectionFormat(pipe, ioutil, http, url, context, requiredNotNullable, requiredNullable, notRequiredNotNullable, notRequiredNullable);
+                apiInstance.TestQueryParameterCollectionFormat(context, http, ioutil, pipe, requiredNotNullable, url, notRequiredNotNullable, notRequiredNullable, requiredNullable);
             }
             catch (ApiException  e)
             {
@@ -1698,7 +1698,7 @@ This returns an ApiResponse object which contains the response data, status code
 ```csharp
 try
 {
-    apiInstance.TestQueryParameterCollectionFormatWithHttpInfo(pipe, ioutil, http, url, context, requiredNotNullable, requiredNullable, notRequiredNotNullable, notRequiredNullable);
+    apiInstance.TestQueryParameterCollectionFormatWithHttpInfo(context, http, ioutil, pipe, requiredNotNullable, url, notRequiredNotNullable, notRequiredNullable, requiredNullable);
 }
 catch (ApiException e)
 {
@@ -1712,15 +1712,15 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **pipe** | [**List&lt;string&gt;**](string.md) |  |  |
-| **ioutil** | [**List&lt;string&gt;**](string.md) |  |  |
-| **http** | [**List&lt;string&gt;**](string.md) |  |  |
-| **url** | [**List&lt;string&gt;**](string.md) |  |  |
 | **context** | [**List&lt;string&gt;**](string.md) |  |  |
+| **http** | [**List&lt;string&gt;**](string.md) |  |  |
+| **ioutil** | [**List&lt;string&gt;**](string.md) |  |  |
+| **pipe** | [**List&lt;string&gt;**](string.md) |  |  |
 | **requiredNotNullable** | **string** |  |  |
-| **requiredNullable** | **string** |  |  |
+| **url** | [**List&lt;string&gt;**](string.md) |  |  |
 | **notRequiredNotNullable** | **string** |  | [optional]  |
 | **notRequiredNullable** | **string** |  | [optional]  |
+| **requiredNullable** | **string** |  |  |
 
 ### Return type
 

samples/client/petstore/csharp/generichost/standard2.0/Petstore/docs/apis/UserApi.md

@@ -453,7 +453,7 @@ No authorization required
 
 <a id="loginuser"></a>
 # **LoginUser**
-> string LoginUser (string username, string password)
+> string LoginUser (string password, string username)
 
 Logs user into the system
 
@@ -474,13 +474,13 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new UserApi(config);
-            var username = "username_example";  // string | The user name for login
             var password = "password_example";  // string | The password for login in clear text
+            var username = "username_example";  // string | The user name for login
 
             try
             {
                 // Logs user into the system
-                string result = apiInstance.LoginUser(username, password);
+                string result = apiInstance.LoginUser(password, username);
                 Debug.WriteLine(result);
             }
             catch (ApiException  e)
@@ -501,7 +501,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Logs user into the system
-    ApiResponse<string> response = apiInstance.LoginUserWithHttpInfo(username, password);
+    ApiResponse<string> response = apiInstance.LoginUserWithHttpInfo(password, username);
     Debug.Write("Status Code: " + response.StatusCode);
     Debug.Write("Response Headers: " + response.Headers);
     Debug.Write("Response Body: " + response.Data);
@@ -518,8 +518,8 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **username** | **string** | The user name for login |  |
 | **password** | **string** | The password for login in clear text |  |
+| **username** | **string** | The user name for login |  |
 
 ### Return type
 
@@ -625,7 +625,7 @@ No authorization required
 
 <a id="updateuser"></a>
 # **UpdateUser**
-> void UpdateUser (string username, User user)
+> void UpdateUser (User user, string username)
 
 Updated user
 
@@ -648,13 +648,13 @@ namespace Example
             Configuration config = new Configuration();
             config.BasePath = "http://petstore.swagger.io:80/v2";
             var apiInstance = new UserApi(config);
-            var username = "username_example";  // string | name that need to be deleted
             var user = new User(); // User | Updated user object
+            var username = "username_example";  // string | name that need to be deleted
 
             try
             {
                 // Updated user
-                apiInstance.UpdateUser(username, user);
+                apiInstance.UpdateUser(user, username);
             }
             catch (ApiException  e)
             {
@@ -674,7 +674,7 @@ This returns an ApiResponse object which contains the response data, status code
 try
 {
     // Updated user
-    apiInstance.UpdateUserWithHttpInfo(username, user);
+    apiInstance.UpdateUserWithHttpInfo(user, username);
 }
 catch (ApiException e)
 {
@@ -688,8 +688,8 @@ catch (ApiException e)
 
 | Name | Type | Description | Notes |
 |------|------|-------------|-------|
-| **username** | **string** | name that need to be deleted |  |
 | **user** | [**User**](User.md) | Updated user object |  |
+| **username** | **string** | name that need to be deleted |  |
 
 ### Return type
 

samples/client/petstore/csharp/generichost/standard2.0/Petstore/src/Org.OpenAPITools.Test/Api/FakeApiTests.cs

@@ -193,20 +193,20 @@ namespace Org.OpenAPITools.Test.Api
         public async Task TestEndpointParametersAsyncTest()
         {
             decimal number = default;
-            double varDouble = default;
             string patternWithoutDelimiter = default;
             byte[] varByte = default;
-            Client.Option<int> integer = default;
-            Client.Option<int> int32 = default;
-            Client.Option<long> int64 = default;
-            Client.Option<float> varFloat = default;
-            Client.Option<string> varString = default;
+            double varDouble = default;
             Client.Option<System.IO.Stream> binary = default;
+            Client.Option<string> callback = default;
             Client.Option<DateTime> date = default;
             Client.Option<DateTime> dateTime = default;
+            Client.Option<int> int32 = default;
+            Client.Option<long> int64 = default;
+            Client.Option<int> integer = default;
             Client.Option<string> password = default;
-            Client.Option<string> callback = default;
-            await _instance.TestEndpointParametersAsync(number, varDouble, patternWithoutDelimiter, varByte, integer, int32, int64, varFloat, varString, binary, date, dateTime, password, callback);
+            Client.Option<float> varFloat = default;
+            Client.Option<string> varString = default;
+            await _instance.TestEndpointParametersAsync(number, patternWithoutDelimiter, varByte, varDouble, binary, callback, date, dateTime, int32, int64, integer, password, varFloat, varString);
         }
 
         /// <summary>
@@ -215,15 +215,15 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task TestEnumParametersAsyncTest()
         {
-            Client.Option<List<string>> enumHeaderStringArray = default;
-            Client.Option<string> enumHeaderString = default;
-            Client.Option<List<string>> enumQueryStringArray = default;
-            Client.Option<string> enumQueryString = default;
-            Client.Option<int> enumQueryInteger = default;
-            Client.Option<double> enumQueryDouble = default;
-            Client.Option<List<string>> enumFormStringArray = default;
             Client.Option<string> enumFormString = default;
-            await _instance.TestEnumParametersAsync(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
+            Client.Option<List<string>> enumFormStringArray = default;
+            Client.Option<string> enumHeaderString = default;
+            Client.Option<List<string>> enumHeaderStringArray = default;
+            Client.Option<double> enumQueryDouble = default;
+            Client.Option<int> enumQueryInteger = default;
+            Client.Option<string> enumQueryString = default;
+            Client.Option<List<string>> enumQueryStringArray = default;
+            await _instance.TestEnumParametersAsync(enumFormString, enumFormStringArray, enumHeaderString, enumHeaderStringArray, enumQueryDouble, enumQueryInteger, enumQueryString, enumQueryStringArray);
         }
 
         /// <summary>
@@ -232,13 +232,13 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task TestGroupParametersAsyncTest()
         {
-            int requiredStringGroup = default;
             bool requiredBooleanGroup = default;
             long requiredInt64Group = default;
-            Client.Option<int> stringGroup = default;
+            int requiredStringGroup = default;
             Client.Option<bool> booleanGroup = default;
             Client.Option<long> int64Group = default;
-            await _instance.TestGroupParametersAsync(requiredStringGroup, requiredBooleanGroup, requiredInt64Group, stringGroup, booleanGroup, int64Group);
+            Client.Option<int> stringGroup = default;
+            await _instance.TestGroupParametersAsync(requiredBooleanGroup, requiredInt64Group, requiredStringGroup, booleanGroup, int64Group, stringGroup);
         }
 
         /// <summary>
@@ -278,16 +278,16 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task TestQueryParameterCollectionFormatAsyncTest()
         {
-            List<string> pipe = default;
-            List<string> ioutil = default;
-            List<string> http = default;
-            List<string> url = default;
             List<string> context = default;
+            List<string> http = default;
+            List<string> ioutil = default;
+            List<string> pipe = default;
             string requiredNotNullable = default;
-            string requiredNullable = default;
+            List<string> url = default;
             Client.Option<string> notRequiredNotNullable = default;
             Client.Option<string> notRequiredNullable = default;
-            await _instance.TestQueryParameterCollectionFormatAsync(pipe, ioutil, http, url, context, requiredNotNullable, requiredNullable, notRequiredNotNullable, notRequiredNullable);
+            string requiredNullable = default;
+            await _instance.TestQueryParameterCollectionFormatAsync(context, http, ioutil, pipe, requiredNotNullable, url, notRequiredNotNullable, notRequiredNullable, requiredNullable);
         }
 
         /// <summary>

samples/client/petstore/csharp/generichost/standard2.0/Petstore/src/Org.OpenAPITools.Test/Api/UserApiTests.cs

@@ -108,9 +108,9 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task LoginUserAsyncTest()
         {
-            string username = default;
             string password = default;
-            var response = await _instance.LoginUserAsync(username, password);
+            string username = default;
+            var response = await _instance.LoginUserAsync(password, username);
             var model = response.Ok();
             Assert.IsType<string>(model);
         }
@@ -130,9 +130,9 @@ namespace Org.OpenAPITools.Test.Api
         [Fact (Skip = "not implemented")]
         public async Task UpdateUserAsyncTest()
         {
-            string username = default;
             User user = default;
-            await _instance.UpdateUserAsync(username, user);
+            string username = default;
+            await _instance.UpdateUserAsync(user, username);
         }
     }
 }