[csharp] Fixed duplicate property names

.github/workflows/openapi-generator.yaml

@@ -144,6 +144,7 @@ jobs:
         run: |
           rm -rf samples/client/petstore/csharp/generichost/latest/HelloWorld
           rm -rf samples/client/petstore/csharp/generichost/latest/Tags
+          rm -rf samples/client/petstore/csharp/generichost/latest/OneOfList
 
           rm -rf samples/client/petstore/csharp/generichost/net8/AllOf
           rm -rf samples/client/petstore/csharp/generichost/net8/AnyOf

.github/workflows/samples-dotnet9.yaml

@@ -25,6 +25,7 @@ jobs:
         sample:
           - samples/client/petstore/csharp/generichost/latest/Tags
           - samples/client/petstore/csharp/generichost/latest/HelloWorld
+          - samples/client/petstore/csharp/generichost/latest/OneOfList
           - samples/client/petstore/csharp/generichost/net9/AllOf
           - samples/client/petstore/csharp/generichost/net9/AnyOf
           - samples/client/petstore/csharp/generichost/net9/AnyOfNoCompare

appveyor.yml

@@ -45,6 +45,7 @@ build_script:
 test_script:
   - dotnet test samples\client\petstore\csharp\generichost\latest\Tags\src\Org.OpenAPITools.Test\Org.OpenAPITools.Test.csproj
   - dotnet test samples\client\petstore\csharp\generichost\latest\HelloWorld\src\Org.OpenAPITools.Test\Org.OpenAPITools.Test.csproj
+  - dotnet test samples\client\petstore\csharp\generichost\latest\OneOfList\src\Org.OpenAPITools.Test\Org.OpenAPITools.Test.csproj
 
   - dotnet test samples\client\petstore\csharp\generichost\net9\AllOf\src\Org.OpenAPITools.Test\Org.OpenAPITools.Test.csproj
   - dotnet test samples\client\petstore\csharp\generichost\net9\AnyOf\src\Org.OpenAPITools.Test\Org.OpenAPITools.Test.csproj

bin/configs/csharp-generichost-latest-oneOfList.yaml

@@ -0,0 +1,8 @@
+generatorName: csharp
+outputDir: samples/client/petstore/csharp/generichost/latest/OneOfList
+inputSpec: modules/openapi-generator/src/test/resources/bugs/issue_20739.yaml
+templateDir: modules/openapi-generator/src/main/resources/csharp
+additionalProperties:
+  packageGuid: '{321C8C3F-0156-40C1-AE42-D59761FB9B6C}'
+  modelPropertySorting: alphabetical
+  operationParameterSorting: alphabetical

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

@@ -625,10 +625,11 @@ public Map<String, ModelsMap> postProcessAllModels(Map<String, ModelsMap> objs)
 
             CodegenComposedSchemas composedSchemas = model.getComposedSchemas();
             if (composedSchemas != null) {
+                Set<String> composedPropertyNames = new HashSet<String>();
                 List<CodegenProperty> allOf = composedSchemas.getAllOf();
                 if (allOf != null) {
                     for (CodegenProperty property : allOf) {
-                        property.name = patchPropertyName(model, camelize(property.baseType));
+                        property.name = patchPropertyName(model, camelize(property.baseType), composedPropertyNames);
                         patchPropertyVendorExtensions(property);
                     }
                 }
@@ -637,7 +638,7 @@ public Map<String, ModelsMap> postProcessAllModels(Map<String, ModelsMap> objs)
                 if (anyOf != null) {
                     removePropertiesDeclaredInComposedTypes(objs, model, anyOf);
                     for (CodegenProperty property : anyOf) {
-                        property.name = patchPropertyName(model, camelize(property.baseType));
+                        property.name = patchPropertyName(model, camelize(property.baseType), composedPropertyNames);
                         property.isNullable = true;
                         patchPropertyVendorExtensions(property);
                         property.vendorExtensions.put("x-base-name", model.name.substring(model.name.lastIndexOf('_') + 1));
@@ -648,7 +649,7 @@ public Map<String, ModelsMap> postProcessAllModels(Map<String, ModelsMap> objs)
                 if (oneOf != null) {
                     removePropertiesDeclaredInComposedTypes(objs, model, oneOf);
                     for (CodegenProperty property : oneOf) {
-                        property.name = patchPropertyName(model, camelize(property.baseType));
+                        property.name = patchPropertyName(model, camelize(property.baseType), composedPropertyNames);
                         property.isNullable = true;
                         patchPropertyVendorExtensions(property);
                         property.vendorExtensions.put("x-base-name", model.name.substring(model.name.lastIndexOf('_') + 1));
@@ -715,13 +716,27 @@ private boolean modelIsMutable(CodegenModel model, Set<String> processed) {
     protected void removePropertiesDeclaredInComposedTypes(Map<String, ModelsMap> objs, CodegenModel model, List<CodegenProperty> composedProperties) {
     }
 
-    private String patchPropertyName(CodegenModel model, String value) {
+    private String patchPropertyName(CodegenModel model, String value, Set<String> composedPropertyNames) {
         String name = escapeReservedWord(model, value);
 
         if (name.startsWith(AbstractCSharpCodegen.invalidParameterNamePrefix)) {
             name = AbstractCSharpCodegen.invalidPropertyNamePrefix + name.substring(AbstractCSharpCodegen.invalidParameterNamePrefix.length());
         }
 
+        // ensure the name we use for a composed property does not already exist as a property or composed property
+        // only do this if the set of composed property names was provided to ensure this method is idempotent
+        // we would not calling this method multiple times to result in different values
+        if (composedPropertyNames != null) {
+            String tmpName = name;
+            long count = model.allVars.stream().map(v -> v.name).filter(n -> n.equals(tmpName)).count() + composedPropertyNames.stream().filter(n -> n.equals(tmpName)).count();
+
+            if (count > 0) {
+                name = name + count++;
+            }
+
+            composedPropertyNames.add(name);
+        }
+
         return name;
     }
 
@@ -753,7 +768,7 @@ protected void patchProperty(Map<String, CodegenModel> enumRefs, CodegenModel mo
 
         patchPropertyVendorExtensions(property);
 
-        property.name = patchPropertyName(model, property.name);
+        property.name = patchPropertyName(model, property.name, null);
 
         String[] nestedTypes = {"List", "Collection", "ICollection", "Dictionary"};
 

modules/openapi-generator/src/test/resources/bugs/issue_20739.yaml

@@ -0,0 +1,32 @@
+openapi: 3.0.1
+info:
+  title: Oneof array test
+  version: 1.0.0
+servers:
+- url: /
+paths:
+  /one-of-array:
+    post:
+      description: Oneof array test
+      operationId: oneOfArray
+      requestBody:
+        content:
+          application/json:
+            schema:
+              oneOf:
+              - items:
+                  type: string
+                type: array
+              - items:
+                  $ref: '#/components/schemas/TestObject'
+                type: array
+      responses:
+        "204":
+          description: Successful operation
+components:
+  schemas:
+    TestObject:
+      properties:
+        name:
+          type: string
+      type: object