原文地址：http://www.cnblogs.com/AXzhz/archive/2007/11/02/947011.html
【引】
项目中用了许多UC(User Control),其中有些主页需要知道UC做了某个Event后,进行联动动作.
例如:如果UC的Button控件被Click,那么主页(Page)要做一个显示不同信息的动作.
因为主页(Page)不能直接知道UC里Button被Click的事件,这个时候就用到了事件代理.
【步骤】
①为UC添加事件代理
public event EventHandler AX;
②在appropriate触发条件处添加事件
if (AX != null)
{
AX(this, e);
//Or use the following sentence code.
//AX(this, new EventArgs());
}
{
AX(this, e);
//Or use the following sentence code.
//AX(this, new EventArgs());
}
③添加主页(Page)要执行的事件
protected void Event_AX(object sender, EventArgs e)
{
Response.Write("Event has occur!<br/>");
}
{
Response.Write("Event has occur!<br/>");
}
④在主页(Page)上添加事件代理,从而执行主页上的Function
方法1:*.CS端
UC_AXzhz.AX += new EventHandler(Event_AX);
方法2:*.aspx端【注:使用此方法,Event_AX必须为protected/interanl/public类型,不能为private类型】
<AX:UC_AX ID="UC_AXzhz" OnAX="Event_AX" runat="server" />
【完整代码】
UC前端:
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="UC_AX.ascx.cs" Inherits="UC_AX" %>
<asp:Button ID="btnClick" runat="server" OnClick="btnClick_Click" Style="z-index: 100; left: 156px; position: absolute; top: 113px" Text="ClickMe" Height="25px" Width="74px" />
UC后台:
using System;using System.Data;using System.Configuration;using System.Collections;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;public partial class UC_AX : System.Web.UI.UserControl{
//①添加事件代理 public event EventHandler AX; protected void Page_Load(object sender, EventArgs e)
{
} protected void btnClick_Click(object sender, EventArgs e) { //②如果点击了Button, Fire the代理事件 //可以通过多种条件fire事件代理. //Must add this condition, Otherwise,if AX equal null //Will throw a exception if (AX != null) { AX(this, e); //Or use the following sentence code. //AX(this, new EventArgs()); } }
}
Page前端:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default_AX.aspx.cs" Inherits="Default_AX" %><%@ Register Src="UC_AX.ascx" TagName="UC_AX" TagPrefix="AX" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" ><head runat="server"> <title>Untitled Page</title></head><body> <form id="form1" runat="server"> <div> <!--//④Another way:为代理添加需要执行的事件--> <AX:UC_AX ID="UC_AXzhz" OnAX="Event_AX" runat="server" /> </div> </form></body></html>
Page后台:
using System;using System.Data;using System.Configuration;using System.Collections;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;public partial class Default_AX : System.Web.UI.Page{ protected void Page_Load(object sender, EventArgs e) { //③为代理添加需要执行的事件 UC_AXzhz.AX += new EventHandler(Event_AX); } //⑤当UC的Button被Click后,主页上要执行的动作 protected void Event_AX(object sender, EventArgs e) { Response.Write("Event has occur!<br/>"); }}