事件是C#中一个重要的内容，MSDN上有一个自定义事件的演示示例。我看了半天有点晕，所以新建了一个winform工程添加了一个按钮，然后找出调用的程序，一对比做了一个类似的示例，就明白了。看代码有时候比看文档来得更快。

using System;     namespace TestEventArgs  {      /// <summary>      /// 这个类对应于EventArgs，做对比学习。      /// 添加两个内容：info1，info2。      /// </summary>      public class MyEventArgs : EventArgs      {          private String info1;          private UInt32 info2;             public MyEventArgs(String info1, UInt32 info2)          {              this.info1 = info1;              this.info2 = info2;          }             public String Info1          {              get { return this.info1; }              set { this.info1 = value; }          }             public UInt32 Info2          {              get { return this.info2; }              set { this.info2 = value; }          }      }         /// <summary>      /// 仿真Button按钮      /// </summary>      public class MyButton      {          public delegate void MyEvnetHandler(object sender, MyEventArgs e);          /// <summary>          /// 按钮点击的次数计数器          /// </summary>          public static UInt32 clicked_num = 0;          public event MyEvnetHandler MyClick;             public void 触发()          {              MyEventArgs arg = new MyEventArgs(DateTime.UtcNow.ToString(), ++clicked_num);              MyClick(this, arg);          }      }         /// <summary>      /// 仿真Form窗体      /// </summary>      public class MyForm      {          public MyButton 按钮;          public MyForm()          {              按钮 = new MyButton();              按钮.MyClick += new MyButton.MyEvnetHandler(this.button_Clicked);          }                public void button_Clicked(object sender, MyEventArgs e)          {              Console.WriteLine("button clicked(sender is:" + sender.ToString() + "; info1 = "                  + e.Info1 + "; info2 = " + e.Info2);          }      }         class Program      {          static void Main(string[] args)          {              MyForm 窗体 = new MyForm();              for (int i = 0; i < 10; i++ )              {                  窗体.按钮.触发();                  System.Threading.Thread.Sleep(500);              }              Console.WriteLine("Press any key to continue...");              Console.ReadKey();          }      }  }

不同的地方：
1 本示例中delegate myevnethandler是mybutton类内部成员，在系统中eventhander是system命名空间下的一个成员。