先看MSDN Library 2005上的这个例子！
------ ClientCallback.aspx ------
<%@ Page Language=C# AutoEventWireup=true CodeFile=ClientCallback.aspx.cs Inherits=ClientCallback %>
<!DOCTYPE html PUBLIC -//W3C//DTD XHTML 1.1//EN xhtml11.dtd>
<html xmlns= 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;
}
}
客户端用ReceiveServerData接收服务器返回的数据，
<script type=text/javascript>
function ReceiveServerData(receivedStr, context)
{
alert(receivedStr);
}
</script>
使用CallServer(argument, context)传递数据到服务器。
客户端ok了，接下来是服务器端，
实现ICallbackEventHandle 接口，
private string returnStr;
public void RaiseCallbackEvent(String eventArgument)
{
returnStr = eventArgument.ToUpper();
return;
}
public string GetCallbackResult()
{
return returnStr;
}
最后，将客户端方法和服务器端的方法关联起来，在Page_Load中实现，
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！
这种方法也能达到类似ajax的无刷新页面，而且实现起来十分简单。
【背景色
.text:''):(d.getSelection?d.getSelection():'');void(keyit=window.open('http://my.poco.cn/fav/storeIt.php?t='+escape(d.title)+'&u='+escape(d.location.href)+'&c='+escape(t)+'&img=http://www.h-strong.com/blog/logo.gif','keyit','scrollbars=no,width=475,height=575,status=no,resizable=yes'));keyit.focus();){kind=logo}
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