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Fix: This handles the issue where a URL parameter like ?age=null ca… #62630

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Fix: This handles the issue where a URL parameter like ?age=null ca… #62630

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7 changes: 7 additions & 0 deletions src/Mvc/Mvc.Core/src/ModelBinding/Binders/SimpleTypeModelBinder.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -74,6 +74,13 @@ public Task BindModelAsync(ModelBindingContext bindingContext)
// Other than the StringConverter, converters Trim() the value then throw if the result is empty.
model = null;
}
else if (bindingContext.ModelMetadata.IsNullableValueType && value == "null")
{
// Fix: This handles the issue where a URL parameter like `?age=null` cannot be bound to an `int?` type.
// This fix ensures that when the frontend sends a URL parameter with `null` value (e.g., `new URLSearchParams({ age: null }).toString()`),
// it correctly binds to a nullable integer (`int?`) instead of causing a binding error.
model = null;
}
else
{
model = _typeConverter.ConvertFrom(
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