Question

I have a method with the following signature:

 void MyMethod(Delegate d){};
 void MyMethod(Expression exp){};
 void MyMethod(object obj){};

However, this fails to compile:

MyMethod((int a) => a)

with the following error:

"Cannot convert lambda expression to type 'object' because it is not a delegate type"

Why doesn’t this work?

Edit: I know that this works. The compiler compiles the lambda expression to a delgate in this case I think.

void MyMethod(Func<int, int> d){};

Kind regards,

Answer 1

Because the type System.Delegate isn’t a “Delegate”. It’s just the base class. You have to use a delegate type with the correct signature. Define your Method as follows:

void MyMethod(Func<int, int> objFunc)

EDIT:

MyMethod(object) doesn’t work because a lambda expression has no type at it’s own, but the type is inferred from the type of the location it is assigned to. So object doesn’t work either. You HAVE to use a delegate type with the correct signature.