先看MSDN Library 2005上的這個例子！
------ ClIEntCallback.ASPx ------
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ClIEntCallback.ASPx.cs" Inherits="ClIEntCallback" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/ xHtml11.dtd">
<Html XMLns="http://www.w3.org/1999/xhtm l" >
<head id="Head1" runat="server">
<title>Callback Test</title>
<script type="text/Javascript">
function ReceiveServerData(receivedStr, context)
{
alert(receivedStr);
}
</script>
</head>
<body>
<form id="form1" runat="server">
<input type="button" value="Callback" onclick="CallServer('argument', 'context')"/><br />
</form>
</body>
</Html>-------- ClIEntCallbacp.ASPx.cs -----------
// ClIEntCallback.ASPx.cs
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 ClIEntCallback : System.Web.UI.Page, System.Web.UI.ICallbackEventHandle r
{
void Page_Load(object sender, EventArgs e)
{
ClientScriptManager cm = Page.ClIEntScript;
String cbReference = cm.GetCallbackEventReference(this, "arg", "ReceiveServerData", "");
String callbackScript = "function CallServer(arg, context) {" + cbReference + "; }";
cm.RegisterClIEntScriptBlock(this. GetType(), "CallServer", callbackScript, true);
}
private string returnStr;
//function called by clIEnt, executed on server
public void RaiseCallbackEvent(String eventArgument)
{
//do something with return argument
returnStr = eventArgument.ToUpper();
return;
}
//function that sends result?
public string GetCallbackResult()
{
return returnStr;
}
}
客戶端用ReceiveServerData接收服務器返回的數據，
<script type="text/Javascript">
function ReceiveServerData(receivedStr, context)
{
alert(receivedStr);
}
</script>
使用CallServer('argument', 'context')傳遞數據到服務器。
客戶端ok了，接下來是服務器端，
實現ICallbackEventHandle 接口，
private string returnStr;
public void RaiseCallbackEvent(String eventArgument)
{
returnStr = eventArgument.ToUpper();
return;
}
public string GetCallbackResult()
{
return returnStr;
}
最後，將客戶端方法和服務器端的方法關聯起來，在Page_Load中實現，
ClientScriptManager cm = Page.ClIEntScript;
String cbReference = cm.GetCallbackEventReference(this, "arg", "ReceiveServerData", "");
String callbackScript = "function CallServer(arg, context) {" + cbReference + "; }";
cm.RegisterClIEntScriptBlock(this. GetType(), "CallServer", callbackScript, true);
大功告成！
這種方法也能達到類似AJax的無刷新頁面，而且實現起來十分簡單。