William Cheng 0a2ef5a725
[C#][netcore] better support for additional properties in the payload (#7396)
* add OpenAPIAdditionalPropertiesConverter

* fix buges

* fix writeJson

* better code comment

* move converter to model

* use JsonExtensionData

* update hashcode, equal, tostring and more

* update samples
2020-09-12 01:39:19 +08:00
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