【IT168 技术文档】以下是组件代码：

using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;

namespace NSEventStudy
...{
public delegate void TwoEventHandle(int flag);

public class EventStudy : System.Web.UI.WebControls.WebControl
...{

/**////////////////第一种定义事件的方法////////////////////

public event TwoEventHandle TwoEvent;

public void Execute(int flag)
...{
TwoEvent(flag);
}

/**/////////////////第二种定义事件的方法////////////////////

private static object _Process = new object();
public event TwoEventHandle ThreeEvent
...{
add
...{
Events.AddHandler(_Process,value);
}
remove
...{
Events.RemoveHandler(_Process,value);
}
}

public void InnerExecute(int flag)
...{
TwoEventHandle handle = (TwoEventHandle)Events[_Process];
if(handle != null)
...{
handle(flag);
}
else
...{
this.RaiseBubbleEvent(this,null);
}
}

protected override void Render(HtmlTextWriter writer)
...{
base.Render (writer);
writer.WriteLine("我爱你，中国");
}

}
}


测试程序：
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace TestEvent
...{
/**////
/// WebForm1 的摘要说明。
/// 
public class WebForm1 : System.Web.UI.Page
...{
protected System.Web.UI.WebControls.Button Button1;
protected NSEventStudy.EventStudy EventStudy1;

private void Page_Load(object sender, System.EventArgs e)
...{
// 在此处放置用户代码以初始化页面 
}

Web 窗体设计器生成的代码#region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
...{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}

/**////
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// 
private void InitializeComponent()
...{
this.EventStudy1.ThreeEvent = new 
NSEventStudy.TwoEventHandle(this.EventStudy1_ThreeEvent);
this.EventStudy1.TwoEvent = new 
NSEventStudy.TwoEventHandle(this.EventStudy1_TwoEvent);
this.Button1.Click = new System.EventHandler(this.Button1_Click);
this.Load = new System.EventHandler(this.Page_Load);

}
#endregion

private void EventStudy1_TwoEvent(int flag)
...{
this.Response.Write("javascript:alert('TwoEvent事件触发')");
}

private void EventStudy1_ThreeEvent(int flag)
...{
this.Response.Write("javascript:alert('ThreeEvent事件触发')");
}

private void Button1_Click(object sender, System.EventArgs e)
...{
this.EventStudy1.Execute(6);
this.EventStudy1.InnerExecute(10);
}
}
}