Don't generate RequestBody for parameters when disabledInferredBody is true (#47659) (#47807)

Author: captainsafia

src/OpenApi/src/OpenApiGenerator.cs

@@ -78,7 +78,7 @@ private OpenApiOperation GetOperation(string httpMethod, MethodInfo methodInfo,
             Description = metadata.GetMetadata<IEndpointDescriptionMetadata>()?.Description,
             Tags = GetOperationTags(methodInfo, metadata),
             Parameters = GetOpenApiParameters(methodInfo, pattern, disableInferredBody),
-            RequestBody = GetOpenApiRequestBody(methodInfo, metadata, pattern),
+            RequestBody = GetOpenApiRequestBody(methodInfo, metadata, pattern, disableInferredBody),
             Responses = GetOpenApiResponses(methodInfo, metadata)
         };
 
@@ -251,15 +251,15 @@ private static void GenerateDefaultResponses(Dictionary<int, (Type?, MediaTypeCo
         }
     }
 
-    private OpenApiRequestBody? GetOpenApiRequestBody(MethodInfo methodInfo, EndpointMetadataCollection metadata, RoutePattern pattern)
+    private OpenApiRequestBody? GetOpenApiRequestBody(MethodInfo methodInfo, EndpointMetadataCollection metadata, RoutePattern pattern, bool disableInferredBody)
     {
         var hasFormOrBodyParameter = false;
         ParameterInfo? requestBodyParameter = null;
 
         var parameters = PropertyAsParameterInfo.Flatten(methodInfo.GetParameters(), ParameterBindingMethodCache);
         foreach (var parameter in parameters)
         {
-            var (bodyOrFormParameter, _, _) = GetOpenApiParameterLocation(parameter, pattern, false);
+            var (bodyOrFormParameter, _, _) = GetOpenApiParameterLocation(parameter, pattern, disableInferredBody);
             hasFormOrBodyParameter |= bodyOrFormParameter;
             if (hasFormOrBodyParameter)
             {

src/OpenApi/test/OpenApiGeneratorTests.cs

@@ -928,6 +928,18 @@ static void ValidateParameter(OpenApiOperation operation, string expectedName)
         ValidateParameter(GetOpenApiOperation(([FromHeader(Name = "headerName")] string param) => ""), "headerName");
     }
 
+    [Fact]
+    public void DoesNotGenerateRequestBodyWhenInferredBodyDisabled()
+    {
+        var operation = GetOpenApiOperation((string[] names) => { }, httpMethods: new[] { "GET" });
+
+        var parameter = Assert.Single(operation.Parameters);
+
+        Assert.Equal("names", parameter.Name);
+        Assert.Equal(ParameterLocation.Query, parameter.In);
+        Assert.Null(operation.RequestBody);
+    }
+
     private static OpenApiOperation GetOpenApiOperation(
         Delegate action,
         string pattern = null,