Is there a generic system delegate that takes 2 types and returns the second

Question

I am looking for something like Action but I want it to be

delegate U ReturnAction<T,U>(T param);

Is there already a system delegate for this? I just don't want to reinvent the wheel. I did the same thing when I first needed a Predicate and then realized it existed.

Answer 1

i think you need

Func<T, TRet>

It has various overloads

Func<TRet>
Func<T, TRet>
Func<T1, T2, TRet>
Func<T1, T2, T3, TRet>

Answer 2

Take a look at Func

delegate TReturn Func<T1,TReturn>(T1 arg1);

The 3.5 framework contains several overloads of func. From 0 to 4 arguments are defined.