Delegate in C#

Delegate is a reference type method which holds the reference method.

"Delegates are use at run time".

Declare delegate below this keyword:

Public delegate void mydelegate(String s);

There are two types of delegate.

1. Single cast Delegate -"A single cast delegate contains reference to only one method at a time".

2. Multi cast Delegatec - "A multi cast delegate hold the reference of more than method and execute all the method. It wraps in the calling order".

Example of delegate program print to device.

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;

namespace Delegates
{
    public class Program
    {
        static FileStream fstream;
        static StreamWriter swriter;
        public delegate  void printdata(String s); //apply delegate this program
        public static void Writeconsole(String str)
        {
            Console.WriteLine("", str);
        }
        public static void WriteFile(String s) // name method
        {
            fstream = new FileStream("C:\\Users\\KRISHNA SINGH\\Desktop\\Hi3.txt", FileMode.Append, FileAccess.Write); // Apply to system location for create file u can select any other location  for print file...and  u can create .doc file & .sxlx file & .pps file and more…
            swriter = new StreamWriter(fstream);
            s = s +"";a
            swriter.WriteLine(s);
            swriter.Flush();
            swriter.Close();
            fstream.Close();
        }

        public static void DisplayData(printdata pmethod)
        {
            pmethod("");
        }
        public static void Main()
        {
            printdata pd = new printdata(Writeconsole);
            printdata f1 = new printdata(WriteFile);
            DisplayData(pd);
            DisplayData(f1);
            Console.ReadLine();
        }
    }
}

Then run the program you seen blank console CMD just like as:

Then enter the Button.

Seen the output of this example of the delegate program.

Go to your system location in which location u given in program that this file print or create or not.