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Fix RequestDelegateFactory to handle nullable types correctly in empty request body scenarios #62861

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Fix RequestDelegateFactory to handle nullable types correctly in empty request body scenarios #62861

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4 changes: 3 additions & 1 deletion src/Http/Http.Extensions/src/RequestDelegateFactory.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -1375,7 +1375,9 @@ private static Expression AddResponseWritingToMethodCall(Expression methodCall,
{
object? defaultBodyValue = null;

if (allowEmptyRequestBody && bodyType.IsValueType)
var isNullableType = bodyType.IsGenericType && bodyType.GetGenericTypeDefinition() == typeof(Nullable<>);

if (allowEmptyRequestBody && bodyType.IsValueType && !isNullableType) // Nullable types should be left null
Comment on lines +1379 to +1380
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Copilot AI Jul 22, 2025

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[nitpick] Consider extracting the complex condition into a well-named local variable or method to improve readability. For example: var shouldCreateDefaultValueType = allowEmptyRequestBody && bodyType.IsValueType && !isNullableType;

Suggested change
if (allowEmptyRequestBody && bodyType.IsValueType && !isNullableType) // Nullable types should be left null
var shouldCreateDefaultValueType = allowEmptyRequestBody && bodyType.IsValueType && !isNullableType;
if (shouldCreateDefaultValueType) // Nullable types should be left null

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{
defaultBodyValue = CreateValueType(bodyType);
}
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21 changes: 21 additions & 0 deletions src/Http/Http.Extensions/test/RequestDelegateFactoryTests.cs
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Expand Up @@ -896,6 +896,27 @@ public async Task RequestDelegateRejectsEmptyBodyGivenExplicitFromBodyParameter(
Assert.Equal(400, httpContext.Response.StatusCode);
}

[Fact]
public async Task RequestDelegatePopulatesNullFromBodyNullableParameterWithEmptyBody()
{
var httpContext = CreateHttpContext();
httpContext.Request.Headers["Content-Type"] = "application/json";
httpContext.Request.Headers["Content-Length"] = "0";
httpContext.Features.Set<IHttpRequestBodyDetectionFeature>(new RequestBodyDetectionFeature(false));

var factoryResult = RequestDelegateFactory.Create(
([FromBody] int? body) =>
{
httpContext.Items["body"] = body;
}
);

var requestDelegate = factoryResult.RequestDelegate;
await requestDelegate(httpContext);

Assert.Null(httpContext.Items["body"]);
}

[Fact]
public void RequestDelegateFactoryThrowsForByRefReturnTypes()
{
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