For example, a company (scene), you are a boss, there are two employees, little excitement and little king.
You ordered Xiao Wang, if you play games, then the little king is buckle to 500 yuan.
This is the commission in reality.
In fact, in the write program, the programmer is the boss, Xiaoshu and Xiao Wang are two objects. Small play game is a method, Xiao Zhang also has a game event, he plays games to stimulate this event. Xiao Wang is an event handling object, he is responsible for deducting small money to 500.
Therefore, the commission has the following elements:
1 Excited the object of the event - is Xiao Zhang
2 Objects to handle object events - is Xiao Wang
3 Definition delegate, that is, you let Xiao Wang monitor small.
If these three elements are satisfied, you have written a complete event.
There is an example below: Successful operation in the VS.Net2003 C # console application:
Using system;
Namespace Csharpconsole
{
Public class scene
{
[Stathread]
Public static void main (string [] args)
{
Console.writeline ("Scene starts ...");
/ / Generate Xiao Wang
Xiao Wang W = New Xiao Wang ();
// Generate a small account
Small Zhang Z = New Small ();
/ / Specify monitoring
z.PlayGame = New PlayGameHandler (w. Deduction);
// Start playing games
Z. Play games ();
Console.writeline ("Scene end ...");
Console.readline ();
}
}
/ / People responsible for deducting money
Public Class Xiao Wang
{
Public king ()
{
Console.writeline ("Generate Xiao Wang ...");
}
Public void deduction (Object Sender, Eventargs E)
{
Console.Writeline ("Xiao Wang: Good kid, go to work dare to play games ...");
Console.writeline ("Xiao Wang: See how much your kid is ...");
Small Zhang f = (small sheet) Sender;
Console.writeLine ("Small Money:" f. Money .toString ());
Console.writeline ("Start to deliver money ...");
System.threading.Thread.sleep (500);
f. Money = f. Money - 500;
Console.writeline ("After the deduction .... Now Xiao Zhang still remains:" f. Money .toString ());
}
}
// If you play games, an event is triggered
Public Class small
{
// First define an event, this event means "small" in playing games.
Public Event PlayGameHandler PlayGame;
/ / Save a variable of small money
PRIVATE INT M_MONEY;
Public small ()
{
Console.writeline ("Generate Small ....");
m_money = 1000; // Constructor, initialize the money of small
}
Public int money // This property can operate small money.
{
get
{
RETURN M_MONEY;
}
set
{
M_Money = Value;
}
}
Public void playing games ()
{
Console.writeline ("Xiao Zhang starts to play games .....");
Console.writeline ("Small Zhang: CS fun, hahaha! I play .....");
System.threading.Thread.sleep (500);
System.eventargs e = new evenetargs ();
OnPlayGame (e);
}
Protected Virtual Void OnPlayGame (Eventargs E)
{
IF (PlayGame! = NULL)
{
PlayGame (this, e);
}
}
}
// Define the delegation handler
Public Delegate Void PlayGameHandler (Object Sender, System.EventArgs E);
}
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