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Showing content from https://docs.microsoft.com/en-us/dotnet/fundamentals/code-analysis/quality-rules/ca2257 below:

CA2257: Members defined on an interface with 'DynamicInterfaceCastableImplementationAttribute' should be 'static' - .NET

CA2257: Members defined on an interface with the 'DynamicInterfaceCastableImplementationAttribute' should be 'static'

In this article Property Value Rule ID CA2257 Title Members defined on an interface with the 'DynamicInterfaceCastableImplementationAttribute' should be 'static' Category Usage Fix is breaking or non-breaking Non-breaking Enabled by default in .NET 9 As warning Cause

An interface member isn't explicitly implemented or marked static.

Rule description

Since a type that implements IDynamicInterfaceCastable may not implement a dynamic interface in metadata, calls to an instance interface member that is not an explicit implementation defined on this type are likely to fail at run time. To avoid run-time errors, mark new interface members static.

How to fix violations

Mark the interface member static.

When to suppress errors

Do not suppress a warning from this rule.

See also

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