diff --git a/samples/client/echo_api/csharp-restsharp/README.md b/samples/client/echo_api/csharp-restsharp/README.md
index f71e7d8b43d..76892df3a7e 100644
--- a/samples/client/echo_api/csharp-restsharp/README.md
+++ b/samples/client/echo_api/csharp-restsharp/README.md
@@ -114,6 +114,7 @@ Class | Method | HTTP request | Description
 ------------ | ------------- | ------------- | -------------
 *BodyApi* | [**TestBinaryGif**](docs/BodyApi.md#testbinarygif) | **POST** /binary/gif | Test binary (gif) response body
 *BodyApi* | [**TestBodyApplicationOctetstreamBinary**](docs/BodyApi.md#testbodyapplicationoctetstreambinary) | **POST** /body/application/octetstream/binary | Test body parameter(s)
+*BodyApi* | [**TestBodyMultipartFormdataArrayOfBinary**](docs/BodyApi.md#testbodymultipartformdataarrayofbinary) | **POST** /body/application/octetstream/array_of_binary | Test array of binary in multipart mime
 *BodyApi* | [**TestEchoBodyFreeFormObjectResponseString**](docs/BodyApi.md#testechobodyfreeformobjectresponsestring) | **POST** /echo/body/FreeFormObject/response_string | Test free form object
 *BodyApi* | [**TestEchoBodyPet**](docs/BodyApi.md#testechobodypet) | **POST** /echo/body/Pet | Test body parameter(s)
 *BodyApi* | [**TestEchoBodyPetResponseString**](docs/BodyApi.md#testechobodypetresponsestring) | **POST** /echo/body/Pet/response_string | Test empty response body
diff --git a/samples/client/echo_api/csharp-restsharp/api/openapi.yaml b/samples/client/echo_api/csharp-restsharp/api/openapi.yaml
index 5187a656de6..e48005e9652 100644
--- a/samples/client/echo_api/csharp-restsharp/api/openapi.yaml
+++ b/samples/client/echo_api/csharp-restsharp/api/openapi.yaml
@@ -404,6 +404,25 @@ paths:
       summary: Test binary (gif) response body
       tags:
       - body
+  /body/application/octetstream/array_of_binary:
+    post:
+      description: Test array of binary in multipart mime
+      operationId: test/body/multipart/formdata/array_of_binary
+      requestBody:
+        content:
+          multipart/form-data:
+            schema:
+              $ref: '#/components/schemas/test_body_multipart_formdata_array_of_binary_request'
+      responses:
+        "200":
+          content:
+            text/plain:
+              schema:
+                type: string
+          description: Successful operation
+      summary: Test array of binary in multipart mime
+      tags:
+      - body
 components:
   requestBodies:
     Pet:
@@ -634,4 +653,14 @@ components:
       allOf:
       - $ref: '#/components/schemas/Bird'
       - $ref: '#/components/schemas/Category'
+    test_body_multipart_formdata_array_of_binary_request:
+      properties:
+        files:
+          items:
+            format: binary
+            type: string
+          type: array
+      required:
+      - files
+      type: object
 
diff --git a/samples/client/echo_api/csharp-restsharp/docs/BodyApi.md b/samples/client/echo_api/csharp-restsharp/docs/BodyApi.md
index c698a02564e..4d33c624608 100644
--- a/samples/client/echo_api/csharp-restsharp/docs/BodyApi.md
+++ b/samples/client/echo_api/csharp-restsharp/docs/BodyApi.md
@@ -6,6 +6,7 @@ All URIs are relative to *http://localhost:3000*
 |--------|--------------|-------------|
 | [**TestBinaryGif**](BodyApi.md#testbinarygif) | **POST** /binary/gif | Test binary (gif) response body |
 | [**TestBodyApplicationOctetstreamBinary**](BodyApi.md#testbodyapplicationoctetstreambinary) | **POST** /body/application/octetstream/binary | Test body parameter(s) |
+| [**TestBodyMultipartFormdataArrayOfBinary**](BodyApi.md#testbodymultipartformdataarrayofbinary) | **POST** /body/application/octetstream/array_of_binary | Test array of binary in multipart mime |
 | [**TestEchoBodyFreeFormObjectResponseString**](BodyApi.md#testechobodyfreeformobjectresponsestring) | **POST** /echo/body/FreeFormObject/response_string | Test free form object |
 | [**TestEchoBodyPet**](BodyApi.md#testechobodypet) | **POST** /echo/body/Pet | Test body parameter(s) |
 | [**TestEchoBodyPetResponseString**](BodyApi.md#testechobodypetresponsestring) | **POST** /echo/body/Pet/response_string | Test empty response body |
@@ -181,6 +182,97 @@ No authorization required
  - **Accept**: text/plain
 
 
+### HTTP response details
+| Status code | Description | Response headers |
+|-------------|-------------|------------------|
+| **200** | Successful operation |  -  |
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+<a id="testbodymultipartformdataarrayofbinary"></a>
+# **TestBodyMultipartFormdataArrayOfBinary**
+> string TestBodyMultipartFormdataArrayOfBinary (List<System.IO.Stream> files)
+
+Test array of binary in multipart mime
+
+Test array of binary in multipart mime
+
+### Example
+```csharp
+using System.Collections.Generic;
+using System.Diagnostics;
+using Org.OpenAPITools.Api;
+using Org.OpenAPITools.Client;
+using Org.OpenAPITools.Model;
+
+namespace Example
+{
+    public class TestBodyMultipartFormdataArrayOfBinaryExample
+    {
+        public static void Main()
+        {
+            Configuration config = new Configuration();
+            config.BasePath = "http://localhost:3000";
+            var apiInstance = new BodyApi(config);
+            var files = new List<System.IO.Stream>(); // List<System.IO.Stream> | 
+
+            try
+            {
+                // Test array of binary in multipart mime
+                string result = apiInstance.TestBodyMultipartFormdataArrayOfBinary(files);
+                Debug.WriteLine(result);
+            }
+            catch (ApiException  e)
+            {
+                Debug.Print("Exception when calling BodyApi.TestBodyMultipartFormdataArrayOfBinary: " + e.Message);
+                Debug.Print("Status Code: " + e.ErrorCode);
+                Debug.Print(e.StackTrace);
+            }
+        }
+    }
+}
+```
+
+#### Using the TestBodyMultipartFormdataArrayOfBinaryWithHttpInfo variant
+This returns an ApiResponse object which contains the response data, status code and headers.
+
+```csharp
+try
+{
+    // Test array of binary in multipart mime
+    ApiResponse<string> response = apiInstance.TestBodyMultipartFormdataArrayOfBinaryWithHttpInfo(files);
+    Debug.Write("Status Code: " + response.StatusCode);
+    Debug.Write("Response Headers: " + response.Headers);
+    Debug.Write("Response Body: " + response.Data);
+}
+catch (ApiException e)
+{
+    Debug.Print("Exception when calling BodyApi.TestBodyMultipartFormdataArrayOfBinaryWithHttpInfo: " + e.Message);
+    Debug.Print("Status Code: " + e.ErrorCode);
+    Debug.Print(e.StackTrace);
+}
+```
+
+### Parameters
+
+| Name | Type | Description | Notes |
+|------|------|-------------|-------|
+| **files** | **List&lt;System.IO.Stream&gt;** |  |  |
+
+### Return type
+
+**string**
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+ - **Content-Type**: multipart/form-data
+ - **Accept**: text/plain
+
+
 ### HTTP response details
 | Status code | Description | Response headers |
 |-------------|-------------|------------------|
diff --git a/samples/client/echo_api/csharp-restsharp/src/Org.OpenAPITools/Api/BodyApi.cs b/samples/client/echo_api/csharp-restsharp/src/Org.OpenAPITools/Api/BodyApi.cs
index e6f87fa36e9..abcd4a4071a 100644
--- a/samples/client/echo_api/csharp-restsharp/src/Org.OpenAPITools/Api/BodyApi.cs
+++ b/samples/client/echo_api/csharp-restsharp/src/Org.OpenAPITools/Api/BodyApi.cs
@@ -72,6 +72,29 @@ namespace Org.OpenAPITools.Api
         /// <returns>ApiResponse of string</returns>
         ApiResponse<string> TestBodyApplicationOctetstreamBinaryWithHttpInfo(System.IO.Stream? body = default(System.IO.Stream?), int operationIndex = 0);
         /// <summary>
+        /// Test array of binary in multipart mime
+        /// </summary>
+        /// <remarks>
+        /// Test array of binary in multipart mime
+        /// </remarks>
+        /// <exception cref="Org.OpenAPITools.Client.ApiException">Thrown when fails to make API call</exception>
+        /// <param name="files"></param>
+        /// <param name="operationIndex">Index associated with the operation.</param>
+        /// <returns>string</returns>
+        string TestBodyMultipartFormdataArrayOfBinary(List<System.IO.Stream> files, int operationIndex = 0);
+
+        /// <summary>
+        /// Test array of binary in multipart mime
+        /// </summary>
+        /// <remarks>
+        /// Test array of binary in multipart mime
+        /// </remarks>
+        /// <exception cref="Org.OpenAPITools.Client.ApiException">Thrown when fails to make API call</exception>
+        /// <param name="files"></param>
+        /// <param name="operationIndex">Index associated with the operation.</param>
+        /// <returns>ApiResponse of string</returns>
+        ApiResponse<string> TestBodyMultipartFormdataArrayOfBinaryWithHttpInfo(List<System.IO.Stream> files, int operationIndex = 0);
+        /// <summary>
         /// Test free form object
         /// </summary>
         /// <remarks>
@@ -221,6 +244,31 @@ namespace Org.OpenAPITools.Api
         /// <returns>Task of ApiResponse (string)</returns>
         System.Threading.Tasks.Task<ApiResponse<string>> TestBodyApplicationOctetstreamBinaryWithHttpInfoAsync(System.IO.Stream? body = default(System.IO.Stream?), int operationIndex = 0, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken));
         /// <summary>
+        /// Test array of binary in multipart mime
+        /// </summary>
+        /// <remarks>
+        /// Test array of binary in multipart mime
+        /// </remarks>
+        /// <exception cref="Org.OpenAPITools.Client.ApiException">Thrown when fails to make API call</exception>
+        /// <param name="files"></param>
+        /// <param name="operationIndex">Index associated with the operation.</param>
+        /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
+        /// <returns>Task of string</returns>
+        System.Threading.Tasks.Task<string> TestBodyMultipartFormdataArrayOfBinaryAsync(List<System.IO.Stream> files, int operationIndex = 0, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken));
+
+        /// <summary>
+        /// Test array of binary in multipart mime
+        /// </summary>
+        /// <remarks>
+        /// Test array of binary in multipart mime
+        /// </remarks>
+        /// <exception cref="Org.OpenAPITools.Client.ApiException">Thrown when fails to make API call</exception>
+        /// <param name="files"></param>
+        /// <param name="operationIndex">Index associated with the operation.</param>
+        /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
+        /// <returns>Task of ApiResponse (string)</returns>
+        System.Threading.Tasks.Task<ApiResponse<string>> TestBodyMultipartFormdataArrayOfBinaryWithHttpInfoAsync(List<System.IO.Stream> files, int operationIndex = 0, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken));
+        /// <summary>
         /// Test free form object
         /// </summary>
         /// <remarks>
@@ -700,6 +748,158 @@ namespace Org.OpenAPITools.Api
             return localVarResponse;
         }
 
+        /// <summary>
+        /// Test array of binary in multipart mime Test array of binary in multipart mime
+        /// </summary>
+        /// <exception cref="Org.OpenAPITools.Client.ApiException">Thrown when fails to make API call</exception>
+        /// <param name="files"></param>
+        /// <param name="operationIndex">Index associated with the operation.</param>
+        /// <returns>string</returns>
+        public string TestBodyMultipartFormdataArrayOfBinary(List<System.IO.Stream> files, int operationIndex = 0)
+        {
+            Org.OpenAPITools.Client.ApiResponse<string> localVarResponse = TestBodyMultipartFormdataArrayOfBinaryWithHttpInfo(files);
+            return localVarResponse.Data;
+        }
+
+        /// <summary>
+        /// Test array of binary in multipart mime Test array of binary in multipart mime
+        /// </summary>
+        /// <exception cref="Org.OpenAPITools.Client.ApiException">Thrown when fails to make API call</exception>
+        /// <param name="files"></param>
+        /// <param name="operationIndex">Index associated with the operation.</param>
+        /// <returns>ApiResponse of string</returns>
+        public Org.OpenAPITools.Client.ApiResponse<string> TestBodyMultipartFormdataArrayOfBinaryWithHttpInfo(List<System.IO.Stream> files, int operationIndex = 0)
+        {
+            // verify the required parameter 'files' is set
+            if (files == null)
+            {
+                throw new Org.OpenAPITools.Client.ApiException(400, "Missing required parameter 'files' when calling BodyApi->TestBodyMultipartFormdataArrayOfBinary");
+            }
+
+            Org.OpenAPITools.Client.RequestOptions localVarRequestOptions = new Org.OpenAPITools.Client.RequestOptions();
+
+            string[] _contentTypes = new string[] {
+                "multipart/form-data"
+            };
+
+            // to determine the Accept header
+            string[] _accepts = new string[] {
+                "text/plain"
+            };
+
+            var localVarContentType = Org.OpenAPITools.Client.ClientUtils.SelectHeaderContentType(_contentTypes);
+            if (localVarContentType != null)
+            {
+                localVarRequestOptions.HeaderParameters.Add("Content-Type", localVarContentType);
+            }
+
+            var localVarAccept = Org.OpenAPITools.Client.ClientUtils.SelectHeaderAccept(_accepts);
+            if (localVarAccept != null)
+            {
+                localVarRequestOptions.HeaderParameters.Add("Accept", localVarAccept);
+            }
+
+            foreach (var file in files)
+            {
+                localVarRequestOptions.FileParameters.Add("files", file);
+            }
+
+            localVarRequestOptions.Operation = "BodyApi.TestBodyMultipartFormdataArrayOfBinary";
+            localVarRequestOptions.OperationIndex = operationIndex;
+
+
+            // make the HTTP request
+            var localVarResponse = this.Client.Post<string>("/body/application/octetstream/array_of_binary", localVarRequestOptions, this.Configuration);
+            if (this.ExceptionFactory != null)
+            {
+                Exception _exception = this.ExceptionFactory("TestBodyMultipartFormdataArrayOfBinary", localVarResponse);
+                if (_exception != null)
+                {
+                    throw _exception;
+                }
+            }
+
+            return localVarResponse;
+        }
+
+        /// <summary>
+        /// Test array of binary in multipart mime Test array of binary in multipart mime
+        /// </summary>
+        /// <exception cref="Org.OpenAPITools.Client.ApiException">Thrown when fails to make API call</exception>
+        /// <param name="files"></param>
+        /// <param name="operationIndex">Index associated with the operation.</param>
+        /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
+        /// <returns>Task of string</returns>
+        public async System.Threading.Tasks.Task<string> TestBodyMultipartFormdataArrayOfBinaryAsync(List<System.IO.Stream> files, int operationIndex = 0, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken))
+        {
+            Org.OpenAPITools.Client.ApiResponse<string> localVarResponse = await TestBodyMultipartFormdataArrayOfBinaryWithHttpInfoAsync(files, operationIndex, cancellationToken).ConfigureAwait(false);
+            return localVarResponse.Data;
+        }
+
+        /// <summary>
+        /// Test array of binary in multipart mime Test array of binary in multipart mime
+        /// </summary>
+        /// <exception cref="Org.OpenAPITools.Client.ApiException">Thrown when fails to make API call</exception>
+        /// <param name="files"></param>
+        /// <param name="operationIndex">Index associated with the operation.</param>
+        /// <param name="cancellationToken">Cancellation Token to cancel the request.</param>
+        /// <returns>Task of ApiResponse (string)</returns>
+        public async System.Threading.Tasks.Task<Org.OpenAPITools.Client.ApiResponse<string>> TestBodyMultipartFormdataArrayOfBinaryWithHttpInfoAsync(List<System.IO.Stream> files, int operationIndex = 0, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken))
+        {
+            // verify the required parameter 'files' is set
+            if (files == null)
+            {
+                throw new Org.OpenAPITools.Client.ApiException(400, "Missing required parameter 'files' when calling BodyApi->TestBodyMultipartFormdataArrayOfBinary");
+            }
+
+
+            Org.OpenAPITools.Client.RequestOptions localVarRequestOptions = new Org.OpenAPITools.Client.RequestOptions();
+
+            string[] _contentTypes = new string[] {
+                "multipart/form-data"
+            };
+
+            // to determine the Accept header
+            string[] _accepts = new string[] {
+                "text/plain"
+            };
+
+            var localVarContentType = Org.OpenAPITools.Client.ClientUtils.SelectHeaderContentType(_contentTypes);
+            if (localVarContentType != null)
+            {
+                localVarRequestOptions.HeaderParameters.Add("Content-Type", localVarContentType);
+            }
+
+            var localVarAccept = Org.OpenAPITools.Client.ClientUtils.SelectHeaderAccept(_accepts);
+            if (localVarAccept != null)
+            {
+                localVarRequestOptions.HeaderParameters.Add("Accept", localVarAccept);
+            }
+
+            foreach (var file in files)
+            {
+                localVarRequestOptions.FileParameters.Add("files", file);
+            }
+
+            localVarRequestOptions.Operation = "BodyApi.TestBodyMultipartFormdataArrayOfBinary";
+            localVarRequestOptions.OperationIndex = operationIndex;
+
+
+            // make the HTTP request
+            var localVarResponse = await this.AsynchronousClient.PostAsync<string>("/body/application/octetstream/array_of_binary", localVarRequestOptions, this.Configuration, cancellationToken).ConfigureAwait(false);
+
+            if (this.ExceptionFactory != null)
+            {
+                Exception _exception = this.ExceptionFactory("TestBodyMultipartFormdataArrayOfBinary", localVarResponse);
+                if (_exception != null)
+                {
+                    throw _exception;
+                }
+            }
+
+            return localVarResponse;
+        }
+
         /// <summary>
         /// Test free form object Test free form object
         /// </summary>