ASP.net组件编程中的两种事件编写方法

新客网 XKER.COM 2004-10-21 来源：收藏本文

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
{
/// <summary>
/// WebForm1 的摘要说明。
/// </summary>
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
}

#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);
}

/// <summary>
/// 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。
/// </summary>
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("<script>javascript:alert('TwoEvent事件触发')</script>");
}

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

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

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