C# 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];  
} 

/// <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;  
}