Func type with a parameter and void return

Question

I wanted to know why this doesn't work ? The compiler says that void cannot be used with Func type. In that case what are my options

  Func<int,void> func1 =  (x) => { Console.WriteLine("Hello World"); };

Answer 1

Func<T, TResult> delegate has one parameter and returns a value of the type specified by TResult, you can't use void, because it specifies that method doesn't return any value and can't be used as type argument.

You can use Action<T> delegate in your example, it has a single parameter and doesn't return a value

Action<int> action = (x) => { Console.WriteLine("Hello World"); };

Since x parameter isn't used, you can just use parameterless Action delegate

Action action = delegate { Console.WriteLine("Hello World"); };

Answer 2

You are looking for Action<int>