根据IP获取省市

public class IPAddress      {          /// <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/ips8.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 country = string.Empty;  //国家                         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;              country = html.Substring(index);                   //得到国家                         adr = GetAdrByIp(ip);              return "IP：" + ip + "  国家：" + country + "  省市：" + adr;          }          /// <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>)";              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;              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;          }      }