[C# client generation] Improper handling of 204 status code

[mdzieg]

I have a problem with C# generator.
Version 13.6.2 is the latest one what works. Code generated with that version looks like this:

                         if (status_ == "200") 
                        {
                            return;
                        }
                        else
                        if (status_ != "200" && status_ != "204")
                        {

As of version 13.7.0, generated code thwors exception instead of default value in case 204 status code is returned:

            int status_ = (int) response_.StatusCode;
            if (status_ == 200)
            {
              ...
            }
            else
            { 

I added attributes on controller method to inform generator that it can result with 204, and the code generated is also not okay:

                        var status_ = (int)response_.StatusCode;
                        if (status_ == 200)
                        {
                            var objectResponse_ = await ReadObjectResponseAsync<GetRealizationRepartitionAppDto>(response_, headers_, cancellationToken).ConfigureAwait(false);
                            return objectResponse_.Object;
                        }
                        else
                        if (status_ == 204)
                        {
                            string responseText_ = ( response_.Content == null ) ? string.Empty : await response_.Content.ReadAsStringAsync().ConfigureAwait(false);
                            throw new ApiException("No Content", status_, responseText_, headers_, null);
                        }

swagger.json looks more or less like this (after applying attributes):

"responses": {
					"200": {
						"description": "Success",
						"content": {
							"text/plain": {
								"schema": {
									"$ref": "#/components/schemas/AppDto"
								}
							},
							"application/json": {
								"schema": {
									"$ref": "#/components/schemas/AppDto"
								}
							},
							"text/json": {
								"schema": {
									"$ref": "#/components/schemas/AppDto"
								}
							},
							"application/xml": {
								"schema": {
									"$ref": "#/components/schemas/AppDto"
								}
							},
							"text/xml": {
								"schema": {
									"$ref": "#/components/schemas/AppDto"
								}
							}
						}
					},
					"204": {
						"description": "No Content"
					}
				}

@RicoSuter What should I do to get correct 204 status code handling.

[icnocop]

Related issues:
#1259
#1602
#2995
#4064

You can try one of the work-arounds indicated in one of these comments:
#1259 (comment)
#2995 (comment)
#2995 (comment)
#2995 (comment)
#2995 (comment)

[AnReZa]

Having a similar issue under #5018.

[vvdb-architecture]

See GFlisch/Arc4u.Guidance.Doc#88.
You can solve it with nullable="true" in comments