c#通过ip获取地理信息

/// <summary>
      /// 通过IP得到IP所在地省市（Porschev）
      /// </summary>
      /// <param name="ip"></param>
      /// <returns></returns>
      public string GetAdrByIp(string ip)
      {
          string url = "http://www.cz88.net/ip/?ip=" + ip;
          string regStr = "(?<=<span//s*id=///"cz_addr///">).*?(?=</span>)";
          //得到网页源码
          string html = GetHtml(url);
          Regex reg = new Regex(regStr, RegexOptions.None);
          Match ma = reg.Match(html);
          html = ma.Value;
          string[] arr = html.Split(' ');
          return arr[0];
      }
      /// <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)
      {
          string str = "";
          try
          {
              Uri uri = new Uri(url);
              WebRequest wr = WebRequest.Create(uri);
              Stream s = wr.GetResponse().GetResponseStream();
              StreamReader sr = new StreamReader(s, Encoding.Default);
              str = sr.ReadToEnd();
          }
          catch (Exception e)
          {
          }
          return str;
      }
      /// <summary>
      /// 得到真实IP以及所在地详细信息（Porschev）
      /// </summary>
      /// <returns></returns>
      public string GetIpDetails()
      {
          //设置获取IP地址和国家源码的网址
          string url = "http://www.ip138.com/ips8.asp";
          string regStr = "(?<=<td//s*align=///"center///">)[^<]*?(?=<br/><br/></td>)";
          //IP正则
          string ipRegStr = "((2[0-4]//d|25[0-5]|[01]?//d//d?)//.){3}(2[0-4]//d|25[0-5]|[01]?//d//d?)";
          //IP地址
          string ip = string.Empty;
          //国家
          string country = string.Empty;
          //省市
          string adr = string.Empty;
          //得到网页源码
          string html = GetHtml(url);
          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);
          //得到IP
          ip = ma.Value;
          int index = html.LastIndexOf("：") + 1;
          //得到国家
          country = html.Substring(index);
          adr = GetAdrByIp(ip);
          return "IP：" + ip + " 国家：" + country + " 省市：" + adr;
      }