.NET中CallBack的回调技术

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 Test : System.Web.UI.Page,ICallbackEventHandler
{
    string Resultstr = "";

    protected void Page_Load(object sender, EventArgs e)
    {
             //
    }

    public void RaiseCallbackEvent(string eventArgument)
    {
        Resultstr = "返回了:" + eventArgument;
    }

    public string GetCallbackResult()
    {
        return Resultstr;
    }
}

 

 

 <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Test.aspx.cs" Inherits="Test" %>

<!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>无标题页</title>
    <script type="text/javascript">
   
     function CallbackDo()
     {
       var resultStr=window.document.getElementById("txtname").value;
       <%=this.ClientScript.GetCallbackEventReference(this,"resultStr","getResult",null) %>
     }
    
     function getResult(str)
     {
       document.getElementById("s").innerHTML=str
     }
    
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <input type="text" value="" id="txtname" />
    <input type="button" value="提交" id="bt" onclick="CallbackDo()" />
    </div>
    <span id="s"></span>
    </form>
</body>
</html>

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