Using C# delegates with methods with optional parameters?

Your delegate asks for exactly one parameter while your Foo() method asks for at most two parameters (with the compiler providing default values for unspecified call arguments). Thus the method signatures are different, so you can't associate them this way.

Optional parameters do not change the signature of the method, which is critical to delegates. It only appears to change the signature from the perspective of the caller. What you are trying to achieve cannot be done using the method you have attempted to use.

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