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Delegate in C#:-


It is called a function pointer means we can point to the address of a function using a delegate to call the actual function.

If we do not want to call a particular function in the program then we can use the delegate concepts to call that function indirectly.

means we can say that delegate is an intermediate between function and object.

Syntax of Delegate:-

public delegate returntype  delegatename();

Type of Delegate:-

1) Single Cast  Delegate:-  We can call one delegate to one function

class DelegateExample
    {
        public void fun()
        {
            Console.WriteLine("Fun");
        }
        public delegate void mydelegate();
        static void Main()
        {
            DelegateExample del = new DelegateExample();
            mydelegate obj = new mydelegate(del.fun);
            obj();
            Console.ReadKey();
        }
    }
2) Multicast Delegate:-  We can \point one delegate to multiple functions address

public delegate void delegatename(param);
class DelegateExample
    {
        public void fun()
        {
            Console.WriteLine("Fun");
        }
        public void fun1()
        {
            Console.WriteLine("Fun1");
        }
        public void fun2()
        {
            Console.WriteLine("Fun2");
        }
        public delegate void mydelegate();
        static void Main()
        {
            DelegateExample del = new DelegateExample();
            mydelegate obj = new mydelegate(del.fun);
            obj += del.fun1;
            obj += del.fun2;
            obj();
            Console.ReadKey();
        }
    }


Another Example of Delegate in C#:-

class DelegateExample
    {
        public void fun1()
        {
            Console.WriteLine("Delegate Example");
        }
        public void fun2()
        {
            Console.WriteLine("Delegate Example2");
        }
       public delegate void mydelegate();
       static void Main()
       {
           DelegateExample obj = new DelegateExample();
           mydelegate del = new mydelegate(obj.fun1);
           del += obj.fun2;  //del = del + obj.fun2
           del -= obj.fun1;
           del();
           Console.ReadLine();

       }


    }

1 Comments

POST Answer of Questions and ASK to Doubt

  1. Another example of delegate

    class DelegateExampleNew
    {
    void fun1(int a,int b)
    {
    Console.WriteLine(a + b);
    }
    void fun2(int a, int b)
    {
    Console.WriteLine(a - b);
    }
    public delegate void mydel(int a, int b);

    public static void Main()
    {
    DelegateExampleNew obj = new DelegateExampleNew();
    mydel o = new mydel(obj.fun1);
    o += obj.fun2;
    o(10, 20);
    o(100, 200);
    Console.ReadKey();
    }





    }

    ReplyDelete

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