The system provides the commission Fun and Action delegate

Action type method can delegate 0-16 parameters, but not have a return value.

The method may delegate type Func parameter must have a return value.

 

Actoin use

the using the System;
 the using the System.Collections.Generic;
 the using the System.Linq;
 the using the System.Text;
 the using System.Threading.Tasks; 

namespace event 
{ 
    class Program 
    { 
        static  void the Main ( String [] args) 
        { 
            the Action < int > del M2 = ; // function parameters delegate a 
            del ( 10 ); 
            the Action del1 = M1; // function parameters not delegate 
            del1 (); 
            the Action < int ,int > del2 = M3; // function delegate two parameters 
            del2 ( 10 , 20 is ); 
            the Console.ReadKey (); 
        } 
        static   void M1 () 
        { 
            Console.WriteLine ( " M1 " ); 
        } 
        static  void M2 ( int A) 
        { 
            Console.WriteLine (A); 
        } 
        static  void M3 ( int A, int B) 
        { 
            Console.WriteLine ( " {0}, {}. 1 ",a,b);
        }
    }
}

Func <parameters, return values> delegate use has to return

the using the System;
 the using the System.Collections.Generic;
 the using the System.Linq;
 the using the System.Text;
 the using System.Threading.Tasks; 

namespace event 
{ 
    class Program 
    { 
        static  void the Main ( String [] args) 
        { 
           
            Func < int > = M1 Fun ; // delegate a method without parameters return value of type int 
            Fun (); 
            Func < int , string > = M2 fun1; // entrust a return value of type string, int parameter method 
            fun1 ( 29);
            Console.ReadKey();
        }
        static  int  m1()
        {
           
            return 10;
        }
        static string  m2(int a)
        {
           
            return "string";
        }
       
    }
}