C # generic Delegate Action/func

A generic delegate is actually a predefined delegate of the. NET framework that basically covers all the commonly used delegates, so it is generally not necessary for users to declare them again. simple and convenient .

' 1 generic delegate with no return value

The Action series generic delegate is a delegate that has no return parameter, and the call is not declared as a normal delegate.

Example:

            Action test1 = () => {Console.WriteLine ("Void Method ();");
            Action<int, double> test2 = (int x, double y) => {Console.WriteLine ("Void Method (T1, T2)");

            Test1 ();
            Test2 (2, 3);

"2" has a generic delegate with a return value

Func Series Generic delegate, is a delegate with a return value, and the last parameter represents a return parameter.

Example:

            func<int> test3 = () => {return (a);};
            Func<double, int> test4 = (double x) => {return (int) (x * 2);

            Console.WriteLine (Test3 ());
            Console.WriteLine (Test4 (1.2));