[C#] Add property, parameter naming support

.github/workflows/samples-dotnet6-client.yaml

@@ -20,6 +20,8 @@ on:
       - samples/client/petstore/csharp/OpenAPIClient-net5.0/**
       # build C# API client (.net 5.0 with ConditionalSerialization)
       - samples/client/petstore/csharp/OpenAPIClient-ConditionalSerialization/**
+      # build C# API client (property, parameter name mappings)
+      - samples/client/petstore/csharp-restsharp-name-parameter-mappings/**
   pull_request:
     paths:
       # build C# API client (multiple frameworks)
@@ -39,6 +41,8 @@ on:
       - samples/client/petstore/csharp/OpenAPIClient-net5.0/**
       # build C# API client (.net 5.0 with ConditionalSerialization)
       - samples/client/petstore/csharp/OpenAPIClient-ConditionalSerialization/**
+      # build C# API client (property, parameter name mappings)
+      - samples/client/petstore/csharp-restsharp-name-parameter-mappings/**
 jobs:
   build:
     name: Build .Net clients
@@ -65,6 +69,8 @@ jobs:
           - samples/client/petstore/csharp/OpenAPIClient-net5.0/
           # build C# API client (.net 5.0 with ConditionalSerialization)
           - samples/client/petstore/csharp/OpenAPIClient-ConditionalSerialization/
+          # build C# API client (property, parameter name mappings)
+          - samples/client/petstore/csharp-restsharp-name-parameter-mappings
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-dotnet@v3.2.0

bin/configs/csharp-restsharp-name-mappings.yaml

@@ -0,0 +1,15 @@
+generatorName: csharp
+outputDir: samples/client/petstore/csharp-restsharp-name-parameter-mappings
+inputSpec: modules/openapi-generator/src/test/resources/3_0/name-parameter-mappings.yaml
+templateDir: modules/openapi-generator/src/main/resources/csharp
+nameMappings:
+  _type: UnderscoreType
+  type_: TypeWithUnderscore
+  http_debug_operation: HttpDebugOperation
+parameterNameMappings:
+  _type: UnderscoreType
+  type_: TypeWithUnderscore
+  http_debug_operation: HttpDebugOperation
+additionalProperties:
+  packageGuid: '{321C8C3F-0156-40C1-AE42-D59761FB9B6C}'
+  hideGenerationTimestamp: "true"

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

@@ -963,6 +963,11 @@ public String toOperationId(String operationId) {
 
     @Override
     public String toVarName(String name) {
+        // obtain the name from nameMapping directly if provided
+        if (nameMapping.containsKey(name)) {
+            return nameMapping.get(name);
+        }
+
         // sanitize name
         name = sanitizeName(name);
 
@@ -989,6 +994,11 @@ public String toVarName(String name) {
 
     @Override
     public String toParamName(String name) {
+        // obtain the name from parameterNameMapping directly if provided
+        if (parameterNameMapping.containsKey(name)) {
+            return parameterNameMapping.get(name);
+        }
+
         // sanitize name
         name = sanitizeName(name);
 

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

@@ -1259,6 +1259,11 @@ public String toModelDocFilename(String name) {
 
     @Override
     public String toVarName(String name) {
+        // obtain the name from nameMapping directly if provided
+        if (nameMapping.containsKey(name)) {
+            return nameMapping.get(name);
+        }
+
         // sanitize name
         name = sanitizeName(name);
 

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

@@ -928,6 +928,11 @@ public String toModelDocFilename(String name) {
 
     @Override
     public String toVarName(String name) {
+        // obtain the name from nameMapping directly if provided
+        if (nameMapping.containsKey(name)) {
+            return nameMapping.get(name);
+        }
+
         // sanitize name
         name = sanitizeName(name);
 

modules/openapi-generator/src/test/resources/3_0/name-parameter-mappings.yaml

@@ -0,0 +1,56 @@
+openapi: 3.0.0
+info:
+  description: To test name, parameter mapping options
+  version: 1.0.0
+  title: Dummy
+  license:
+    name: Apache-2.0
+    url: 'https://www.apache.org/licenses/LICENSE-2.0.html'
+paths:
+  /fake/parameter-name-mapping:
+    get:
+      tags:
+        - fake
+      summary: parameter name mapping test
+      operationId: getParameterNameMapping
+      parameters:
+        - name: _type
+          in: header 
+          description: _type
+          required: true
+          schema:
+            type: integer
+            format: int64
+        - name: type
+          in: query
+          description: type
+          required: true
+          schema:
+            type: string
+        - name: type_
+          in: header 
+          description: type_
+          required: true
+          schema:
+            type: string
+        - name: http_debug_option
+          in: query
+          description: http debug option (to test parameter naming option)
+          required: true
+          schema:
+            type: string
+      responses:
+        200:
+          description: OK
+components:
+  schemas:
+    PropertyNameMapping:
+      properties:
+        http_debug_operation:
+          type: string
+        _type:
+          type: string
+        type:
+          type: string
+        type_:
+          type: string