[C#] support .NET framework 4.7 (OpenAPITools#7833)

* add net47 support to the csharp generator

* update doc, fix appveyor

appveyor.yml

@@ -38,6 +38,8 @@ build_script:
   # build C# API client (netcore)
   - dotnet build samples\client\petstore\csharp-netcore\OpenAPIClient\Org.OpenAPITools.sln
   - dotnet build samples\client\petstore\csharp-netcore\OpenAPIClientCore\Org.OpenAPITools.sln
+  # build C# API client (.net framework 4.7)
+  - dotnet build samples\client\petstore\csharp-netcore\OpenAPIClient-net47\Org.OpenAPITools.sln
   # build C# API client
   - nuget restore samples\client\petstore\csharp\OpenAPIClient\Org.OpenAPITools.sln
   - msbuild samples\client\petstore\csharp\OpenAPIClient\Org.OpenAPITools.sln /logger:"C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll"
@@ -55,6 +57,8 @@ test_script:
   # test c# API client (netcore)
   - dotnet test samples\client\petstore\csharp-netcore\OpenAPIClientCore\src\Org.OpenAPITools.Test\Org.OpenAPITools.Test.csproj
   - dotnet test samples\client\petstore\csharp-netcore\OpenAPIClient\src\Org.OpenAPITools.Test\Org.OpenAPITools.Test.csproj
+  # test C# API client (.net framework 4.7)
+  - dotnet test samples\client\petstore\csharp-netcore\OpenAPIClient-net47\src\Org.OpenAPITools.Test\Org.OpenAPITools.Test.csproj
   # test c# API client
   - nunit3-console samples\client\petstore\csharp\OpenAPIClient\src\Org.OpenAPITools.Test\bin\Debug\Org.OpenAPITools.Test.dll --result=myresults.xml;format=AppVeyor
   # test c# API client (with PropertyChanged)

bin/configs/csharp-netcore-OpenAPIClient-net47.yaml

@@ -0,0 +1,11 @@
+# for .net standard
+generatorName: csharp-netcore
+outputDir: samples/client/petstore/csharp-netcore/OpenAPIClient-net47
+inputSpec: modules/openapi-generator/src/test/resources/3_0/java/petstore-with-fake-endpoints-models-for-testing-with-http-signature.yaml
+templateDir: modules/openapi-generator/src/main/resources/csharp-netcore
+additionalProperties:
+  packageGuid: '{321C8C3F-0156-40C1-AE42-D59761FB9B6C}'
+  useCompareNetObjects: true 
+  disallowAdditionalPropertiesIfNotPresent: false
+  useOneOfDiscriminatorLookup: true
+  targetFramework: net47

docs/generators/csharp-netcore.md

@@ -28,7 +28,7 @@ These options may be applied as additional-properties (cli) or configOptions (pl
 |returnICollection|Return ICollection<T> instead of the concrete type.| |false|
 |sortParamsByRequiredFlag|Sort method arguments to place required parameters before optional parameters.| |true|
 |sourceFolder|source folder for generated code| |src|
-|targetFramework|The target .NET framework version.|<dl><dt>**netstandard1.3**</dt><dd>.NET Standard 1.3 compatible</dd><dt>**netstandard1.4**</dt><dd>.NET Standard 1.4 compatible</dd><dt>**netstandard1.5**</dt><dd>.NET Standard 1.5 compatible</dd><dt>**netstandard1.6**</dt><dd>.NET Standard 1.6 compatible</dd><dt>**netstandard2.0**</dt><dd>.NET Standard 2.0 compatible</dd><dt>**netstandard2.1**</dt><dd>.NET Standard 2.1 compatible</dd><dt>**netcoreapp2.0**</dt><dd>.NET Core 2.0 compatible</dd><dt>**netcoreapp2.1**</dt><dd>.NET Core 2.1 compatible</dd><dt>**netcoreapp3.0**</dt><dd>.NET Core 3.0 compatible</dd><dt>**netcoreapp3.1**</dt><dd>.NET Core 3.1 compatible</dd></dl>|netstandard2.0|
+|targetFramework|The target .NET framework version.|<dl><dt>**netstandard1.3**</dt><dd>.NET Standard 1.3 compatible</dd><dt>**netstandard1.4**</dt><dd>.NET Standard 1.4 compatible</dd><dt>**netstandard1.5**</dt><dd>.NET Standard 1.5 compatible</dd><dt>**netstandard1.6**</dt><dd>.NET Standard 1.6 compatible</dd><dt>**netstandard2.0**</dt><dd>.NET Standard 2.0 compatible</dd><dt>**netstandard2.1**</dt><dd>.NET Standard 2.1 compatible</dd><dt>**netcoreapp2.0**</dt><dd>.NET Core 2.0 compatible</dd><dt>**netcoreapp2.1**</dt><dd>.NET Core 2.1 compatible</dd><dt>**netcoreapp3.0**</dt><dd>.NET Core 3.0 compatible</dd><dt>**netcoreapp3.1**</dt><dd>.NET Core 3.1 compatible</dd><dt>**net47**</dt><dd>.NET Framework 4.7 compatible</dd></dl>|netstandard2.0|
 |useCollection|Deserialize array types to Collection&lt;T&gt; instead of List&lt;T&gt;.| |false|
 |useDateTimeOffset|Use DateTimeOffset to model date-time properties| |false|
 |useOneOfDiscriminatorLookup|Use the discriminator's mapping in oneOf to speed up the model lookup. IMPORTANT: Validation (e.g. one and onlye one match in oneOf's schemas) will be skipped.| |false|

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/CSharpNetCoreClientCodegen.java

@@ -61,7 +61,8 @@ public class CSharpNetCoreClientCodegen extends AbstractCSharpCodegen {
             FrameworkStrategy.NETCOREAPP_2_0,
             FrameworkStrategy.NETCOREAPP_2_1,
             FrameworkStrategy.NETCOREAPP_3_0,
-            FrameworkStrategy.NETCOREAPP_3_1
+            FrameworkStrategy.NETCOREAPP_3_1,
+            FrameworkStrategy.NETFRAMEWORK_4_7
     );
     private static FrameworkStrategy defaultFramework = FrameworkStrategy.NETSTANDARD_2_0;
     protected final Map<String, String> frameworks;
@@ -905,6 +906,8 @@ private static abstract class FrameworkStrategy {
         };
         static FrameworkStrategy NETCOREAPP_3_1 = new FrameworkStrategy("netcoreapp3.1", ".NET Core 3.1 compatible", "netcoreapp3.1", Boolean.FALSE) {
         };
+        static FrameworkStrategy NETFRAMEWORK_4_7 = new FrameworkStrategy("net47", ".NET Framework 4.7 compatible", "net47", Boolean.FALSE) {
+        };
         protected String name;
         protected String description;
         protected String testTargetFramework;