订阅事件 和 发布事件
是怎么一回事？

我也不知道。要联系上下文。

using System; //Delegate delegate void UpdateDelegate(); class Subject { public event UpdateDelegate UpdateHandler; //订阅事件 public void Attach( UpdateDelegate ud ) { UpdateHandler += ud; } public void Detach( UpdateDelegate ud ) { UpdateHandler -= ud; } //发布事件 public void Notify() { if(UpdateHandler != null) UpdateHandler(); } } class ConcreteSubject : Subject { private string subjectState; public string SubjectState { get{ return subjectState; } set{ subjectState = value; } } } class ConcreteObserver { private string name; private string observerState; private ConcreteSubject subject; public ConcreteObserver( ConcreteSubject subject, string name ) { this.subject = subject; this.name = name; } public void Update() { observerState = subject.SubjectState; Console.WriteLine( "Observer {0}'s new state is {1}", name, observerState ); } public ConcreteSubject Subject { get { return subject; } set { subject = value; } } } class AnotherObserver { public void Show() { Console.WriteLine("AnotherObserver got an Notification!"); } } public class Client { public static void Main(string[] args) { ConcreteSubject s = new ConcreteSubject(); ConcreteObserver o1 = new ConcreteObserver(s, "1"); ConcreteObserver o2 = new ConcreteObserver(s, "2"); AnotherObserver o3 = new AnotherObserver(); s.Attach(new UpdateDelegate(o1.Update)); s.Attach(new UpdateDelegate(o2.Update)); s.Attach(new UpdateDelegate(o3.Show)); s.SubjectState = "ABC"; s.Notify(); Console.WriteLine("--------------------------"); s.Detach(new UpdateDelegate(o1.Update)); s.SubjectState = "DEF"; s.Notify(); } }

[此贴子已经被静夜思于2005-4-9 17:37:32编辑过]

怎么静哥编辑过呢？

谢谢2楼

不过还是晕晕哦

这个是将订阅者模式该成用代理实现的例子。其实在C#中的代理DELEGATE类似与C中的指针，不过DELEGATE是安全的，又不失其强大的功能。 你去窗口程序中看看 随便一个就有你说的订阅和发布事件。