得到真实外网IP、IP所在国家、省份、地区

来自：http://blog.csdn.net/porschev/article/details/6335519

 #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/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;   
    }        
    #endregion   

    #region##通过IP得到IP所在地省市    
    /// <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];    
    }    
    #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