atlas调用本地web services那是相当的简单，调用远程的也不难，看了dflying chen的几篇文章也学了不少内容，尤其是yahoo天气预报的例子更是受益匪浅。自己动手实践一把。
目标：实现IP地址查询功能.输入IP地址，获得该IP所在的国家和城市。
难点:1)如何设置调用远程服务的asbx文件（有关配置支持asbx的方法可以见dflying chen 的介绍)
难点2):如何动态获得请求的客户端IP，然后在js中使用。
首先，建立一个网络服务，用于查询IP，IP地址信息库是一个mdb文件,相关代码为：
using System;using System.Web;using System.Web.Services;using System.Web.Services.Protocols;using System.Data;using System.Data.OleDb;[WebService(Namespace = "http://tempuri.org/")][WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]public class Service : System.Web.Services.WebService
{
public Service () {
//如果使用设计的组件，请取消注释以下行 //InitializeComponent(); 
} [WebMethod] public string[] GetIPAddress(string ip) { //数据库文件物理路径 string dbFilePath = Server.MapPath("~/App_Data/IPaddress.mdb"); //数据库连接字符串 string conStr = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=" + dbFilePath; string country = "未知"; string city = "未知"; //数据库连接 OleDbConnection con = new OleDbConnection(conStr); try { long ipAddress = System.Net.IPAddress.Parse(ip).Address; string cmdText = " select top 1 * from dv_address where ip1 <= " + ipAddress + " and ip2 >= " + ipAddress; con.Open(); OleDbCommand cmd = new OleDbCommand(cmdText, con); OleDbDataReader dr = cmd.ExecuteReader(); if (dr.Read()) { country = dr["country"].ToString(); city = dr["city"].ToString(); } } catch { return new string[] { country, city }; } finally { con.Close(); } return new string[] { country, city }; } 
}注意，该web services必须支持HTTP-Get方式访问，故需要如下web.config配置
<system.web> <webServices> <protocols> <add name="HttpPost"/> <add name="HttpGet"/> </protocols> </webServices></system.web>网络服务建好了，下面就是调用了。
建立一个新的网站，首先建立一个IPServices.asbx文件，该文件是将远程服务映射到本地的配置文件，有关信息见dflying chen的文章。文件内容如下：
asbx配置文件<?XML version="1.0" encoding="utf-8"?><bridge namespace="n2dog" className="IpServices"> <proxy type="Microsoft.Web.Services.BridgeRestProxy" serviceUrl="http://127.0.0.1/IPServices/Service.asmx/GetIPAddress"></proxy> <method name="GetIPAddress"> <input> <parameter name="ip"></parameter> </input> </method></bridge>调用页面为:
页面前台<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.ASPx.cs" Inherits="_Default" %><!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/xHTML"><head runat="server"> <title>Untitled Page</title> <script language="JavaScript" type="text/JavaScript"> function onGetCompleted(result) { $("country").innerHTML = "您的位置:"+result; } </script></head><body> <form id="form1" runat="server"> <atlas:ScriptManager ID="ScriptManager1" runat="server"> <Services> <atlas:ServiceReference Path="IPServices.asbx" /> </Services> </atlas:ScriptManager> <div> <input id="Button1" type="button" value="button" onclick="getIpAddress()" /><div id="country"></div> </div> </form> <script type="text/XML-script"> <page XMLns:script="http://schemas.microsoft.com/XML-script/2005"> <references> </references> <components> </components> </page> </script></body></HTML>因为javscript不容易获得本机IP地址，故在后台注册了脚本，解决第二个难点问题 ：后台代码
using System;using System.Data;using System.Configuration;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;using System.Text;public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { StringBuilder sb = new StringBuilder(); string ip = Request.UserHostAddress; sb.Append("<script language=\"JavaScript\" type=\"text/JavaScript\">"); sb.Append(" function getIpAddress(){var ip=""+ip+"";n2dog.IpServices.GetIPAddress({"ip":ip},onGetCompleted);}"); sb.Append("</script>"); string script = sb.ToString(); Page.RegisterClientScriptBlock("IpServices", script); }}这样目标即可实现，效果图：
