c# vb .net: base class for functions?

I'm trying to do a function that takes a function as a parameter and returns a function which is a memoized version of the input.

Ok sry if that doesn't make sense but anyway, my question is is there a base class or interface for the function DynamicInvoke found in System.Func(of T) and System.Func(of T, T2) and System.Func(开发者_高级运维of T, T2, T3) etc etc

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DynamicInvoke is a member of the Delegate class.