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
}
}