Question

Everytime I need a very small Method that only uses its parameters…

Should I use declare a Delegate or a Method?

Eg: Multiply three numbers

Func<int, int, int, int> Multiply = (a,b,c) => a*b*c;

and

int Multiply(int a, int b, int c) 
{
    return a*b*c;
}

Edit:

I want to focus this question in terms of eficiency when compiling, and readability.

Answer 1

I wouldn’t declare a delegate rather than a method just for the sake of it. If you’re just to call this directly from other code in your class, a method is more idiomatic. If it doesn’t need to use any instance variables, you may want to make it a static method to make that clear.

On the other hand, if you only ever need to use it as a delegate, use a lambda expression to create that delegate (as per your first example).

If you want to call it directly and use it as a delegate, you can use a method group conversion to create a delegate easily:

int d = Multiply(a, b, c); // Normal method invocation
DoSomethingWithFunction(values, Multiply); // Method group conversion