获取客户端访问的真实IP和区域

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using System.Text;using System.Net;using System.IO;using System.Text.RegularExpressions;namespace GetIPAndArea{    public partial class GetIPAndArea : System.Web.UI.Page    {        protected void Page_Load(object sender, EventArgs e)        {            Response.Write("<script>alert('" + GetIpDetails() + "');</script>");        }        #region //得到真实IP以及所在地详细信息        /// <summary>              /// 得到真实IP以及所在地详细信息（Porschev）              /// </summary>              /// <returns></returns>              public string GetIpDetails()        {            string url = "http://www.ip138.com/ips138.asp";   //设置获取IP地址和国家源码的网址                      string regStr = "(?<=<td\\s*align=\\\"center\\\">)[^<]*?(?=<br/><br/></td>)";            string ipRegStr = "((2[0-4]\\d|25[0-5]|[01]?\\d\\d?)\\.){3}(2[0-4]\\d|25[0-5]|[01]?\\d\\d?)";//IP正则                              string ip = string.Empty;   //IP地址                         string adr = string.Empty;//省市                      string html = GetHtml(url); //得到网页源码                      Regex reg = new Regex(regStr, RegexOptions.None);            Match ma = reg.Match(html); html = ma.Value;            Regex ipReg = new Regex(ipRegStr, RegexOptions.None);            ma = ipReg.Match(html);            ip = ma.Value;//得到IP                      int index = html.LastIndexOf("：") + 1;            adr = html.Substring(index);//得到省市                    return "IP：" + ip+ "  省市：" + adr;        }        #endregion        #region //获取HTML源码信息        /// <summary>              /// 获取HTML源码信息(Porschev)              /// </summary>              /// <param name="url">获取地址</param>              /// <returns>HTML源码</returns>              public string GetHtml(string url)        {            Uri uri = new Uri(url);            WebRequest wr = WebRequest.Create(uri);            Stream s = wr.GetResponse().GetResponseStream();            StreamReader sr = new StreamReader(s,Encoding.Default);            return sr.ReadToEnd();        }        #endregion      }}