根据IP获取省市

/// <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;     
}   
     
    
/// <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];     
}