RDG010: InvalidAsParameters Nullable

<!-- UPDATE 9.0 Activate after release and INCLUDE is updated [!INCLUDE[](~/includes/not-latest-version.md)] -->

	Value
Rule ID	RDG010
Fix is breaking or non-breaking	Non-breaking

Cause

This diagnostic is emitted by the Request Delegate Generator when an endpoint contains a route handler with a parameter annotated with the [AsParameters] attribute that is marked as nullable.

Rule description

The implementation of surrogate binding via the [AsParameters] attribute in Minimal APIs only supports types that are not nullable.

:::code language="csharp" source="~/../AspNetCore.Docs.Samples/fundamentals/aot/diagnostics/Rdg10/Program.cs" id="snippet_1" highlight="13":::

How to fix violations

Declare the parameter as non-nullable.

:::code language="csharp" source="~/../AspNetCore.Docs.Samples/fundamentals/aot/diagnostics/Rdg10/Program.cs" id="snippet_1f" highlight="13":::

When to suppress warnings

This warning should not be suppressed. Suppressing the warning leads to a runtime exception associated with the same warning.