C # DEMO code of delegation Mechanism

Figure 1 delegation demonstration with EventArgs

Figure 2 Delegate demonstration without EventArgs

Download the source code in this example:
1. Delegate without Parameters
2. Delegate with Parameters

The source code of the delegate demo with EventArgs is as follows:

Using System;
Using System. Collections. Generic;
Using System. ComponentModel;
Using System. Data;
Using System. Drawing;
Using System. Linq;
Using System. Text;
Using System. Windows. Forms;
Using System. Collections;
Using System. Diagnostics;

Namespace WindowsFormsApplication8
{
Public partial class Form1: Form
{
Public static TextBox ttt = null;
Public Form1 ()
{
Initializecomponent ();
TTT = This. textbox1;

}

P rivate void button#click (Object sender, eventargs E)
{
Employee employee1 = new employee ();
Employee1.age = 33;
Employee1.name = "";
Admin admin1 = new admin ();
Employee1.playgame + = new delegate1 (admin1.notify );
Employee1.games ();

}

P rivate class employee
{
String name = "";
Int age = 0;
Public event delegate1 playgame;

Public String Name
{
Get {return this. name ;}
Set {this. name = value ;}
}

Public int Age
{
Get {return this. age ;}
Set {this. age = value ;}
}

Public void games ()
{
If (playgame! = Null)
{
Custom e = new custom ();
E. Age = this. age;
E. Name = This. Name;
Playgame (this, e );
}
}
}

P rivate class Admin
{

Public void notify (Object sender, custom E)
{
Form1.ttt. Text = e. Name + playing the game! Age: "+ e. Age. ToString () +" hour ?;
}
}

Public delegate void delegate1 (object sender, custom e );

Public class custom: EventArgs
{
String name = "";
Int age = 0;

Public String Name
{
Set {this. name = value ;}
Get {return this. name ;}
}

Public int Age
{
Set {this. age = value ;}
Get {return this. age ;}
}
}

}
}