C#代码
- using System;
- using System.Collections.Generic;
- using System.Text;
- namespace 事件处理
- {
- // Declare the delegate handler for the event:
- public delegate void MyEventHandler();
- class TestEvent
- {
- // Declare the event implemented by MyEventHandler.
- public event MyEventHandler TriggerIt;
- // Declare a method that triggers the event:
- public void Trigger()
- {
- TriggerIt();
- }
- // Declare the methods that will be associated with the TriggerIt event.
- public void MyMethod1()
- {
- System.Console.WriteLine("Hello!");
- }
- public void MyMethod2()
- {
- System.Console.WriteLine("Hello again!");
- }
- public void MyMethod3()
- {
- System.Console.WriteLine("Good-bye!");
- }
- static void Main()
- {
- // Create an instance of the TestEvent class.
- TestEvent myEvent = new TestEvent();
- // Subscribe to the event by associating the handlers with the events:
- myEvent.TriggerIt += new MyEventHandler(myEvent.MyMethod1);
- myEvent.TriggerIt += new MyEventHandler(myEvent.MyMethod2);
- myEvent.TriggerIt += new MyEventHandler(myEvent.MyMethod3);
- // Trigger the event:
- myEvent.Trigger();
- // Unsuscribe from the the event by removing the handler from the event:
- myEvent.TriggerIt -= new MyEventHandler(myEvent.MyMethod2);
- System.Console.WriteLine("\"Hello again!\" unsubscribed from the event.");
- // Trigger the new event:
- myEvent.Trigger();
- Console.ReadKey();
- }
- }
- }
C#代码
- 输出内容如下：
C#代码
- Hello!
- Hello again!
- Good-bye!
- "Hello again!" unsubscribed from the event.
- Hello!
- Good-bye!
