很好理解的事件机制模型，即监听者模式。。不用什么循环监听或什么的。详细见文摘中的设计模式六

using System; using System.Collections; // "Subject" abstract class Subject { // Fields private ArrayList observers = new ArrayList(); // Methods public void Attach( Observer observer ) { observers.Add( observer ); } public void Detach( Observer observer ) { observers.Remove( observer ); } public void Notify() { foreach( Observer o in observers ) o.Update(); } } // "ConcreteSubject" class ConcreteSubject : Subject { // Fields private string subjectState; // Properties public string SubjectState { get{ return subjectState; } set{ subjectState = value; } } } // "Observer" abstract class Observer { // Methods abstract public void Update(); } // "ConcreteObserver" class ConcreteObserver : Observer { // Fields private string name; private string observerState; private ConcreteSubject subject; // Constructors public ConcreteObserver( ConcreteSubject subject, string name ) { this.subject = subject; this.name = name; } // Methods override public void Update() { observerState = subject.SubjectState; Console.WriteLine( "Observer {0}'s new state is {1}", name, observerState ); } // Properties public ConcreteSubject Subject { get { return subject; } set { subject = value; } } } /**//// <summary> /// Client test /// </summary> public class Client { public static void Main( string[] args ) { // Configure Observer structure ConcreteSubject s = new ConcreteSubject(); s.Attach( new ConcreteObserver( s, "1" ) ); s.Attach( new ConcreteObserver( s, "2" ) ); s.Attach( new ConcreteObserver( s, "3" ) ); // Change subject and notify observers s.SubjectState = "ABC"; s.Notify(); } } 本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/Venlin/archive/2007/06/20/1658821.aspx