ASP.NET 2.0 中的无刷新页面
这几天在微软网站看了一编客户端回客户端回调实现 (C#) 示例
（网址为：http://msdn2.microsoft.com/zh-CN/library/ms178210.aspx）
用它就能实现基本Ajax的原System.Web.UI.ICallbackEventHandler理功能，而不学习一些Ajax框架的东西，感觉挺爽呀，可是运行起报错，后经过仔细查找原来是System.Web.UI.ICallbackEventHandler的接口不是它那样写的，可能它是原来的接口吧。后我照2.0的接口改成下面的样子，运行吗ok，是一个不错无刷新技术。
它的基本原理,微软的试例已经介绍非常祥细了，在此我就不搬门弄斧了，有兴趣的朋友去，去http://www.cnblogs.com/RicCC/archive/2006/09/10/500268.html这个网址看看吧
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %><!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 LookUpStock()
{
var lb = document.forms[0].ListBox1; var product = lb.options[lb.selectedIndex].text CallServer(product, "");
} function ReceiveServerData(rValue) { Results.innerText = rValue; } </script></head><body> <form id="form1" runat="server"> <div> <asp:ListBox ID="ListBox1" Runat="server"></asp:ListBox> <br /> <br /> <button onclick="LookUpStock()">Look Up Stock</button> <br /> <br /> Items in stock: <span ID="Results"></span> <br /> </div> </form></body></html>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 : System.Web.UI.Page, System.Web.UI.ICallbackEventHandler{ protected System.Collections.Specialized.ListDictionary catalog; protected void Page_Load(object sender, EventArgs e)
{
String cbReference = Page.ClientScript.GetCallbackEventReference(this, "arg", "ReceiveServerData", "context"); String callbackScript; callbackScript = "function CallServer(arg, context)" + "{ " + cbReference + "} ;"; Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "CallServer", callbackScript, true); catalog = new System.Collections.Specialized.ListDictionary(); catalog.Add("monitor", 12); catalog.Add("laptop", 10); catalog.Add("keyboard", 23); catalog.Add("mouse", 17); ListBox1.DataSource = catalog; ListBox1.DataTextField = "key"; ListBox1.DataBind();
} String returnValue; public void RaiseCallbackEvent(String eventArgument) { if (catalog[eventArgument] == null) { returnValue = "-1"; } else { returnValue = catalog[eventArgument].ToString(); } // } public string GetCallbackResult() { return returnValue; }}
