关于获取外网IP的问题

Question

public static string GetIP()
        {
            Uri uri = new Uri("http://www.ip138.com/ips8.asp");//查本机网络IP的网页
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(uri);
            req.Method = "POST";
            req.ContentType = "application/x-www-form-urlencoded";
            req.ContentLength = 0;
            req.CookieContainer = new CookieContainer();
            req.GetRequestStream().Write(new byte[0], 0, 0);
            HttpWebResponse res = (HttpWebResponse)(req.GetResponse());
            StreamReader rs = new StreamReader(res.GetResponseStream(), Encoding.GetEncoding("GB18030"));
            string s = rs.ReadToEnd();
            rs.Close();
            req.Abort();
            res.Close();
            Match m = Regex.Match(s, @"IP：\[(?<IP>[0-9\.]*)\]");
            if (m.Success)
            {
                return m.Groups["IP"].Value;
            }
            else
            {
                return "搜查中...";
            }
        } 
请问GetIP()这个方法有写错吗？我调用返回到Lable的时候，是返回搜查中的，请问我的语句是否些错了，因而无法获取外网IP？然后请问怎样解决问题？？

Answer 1

public static string GetIP()
        {
            Uri uri = new Uri("http://www.ip138.com/ips8.asp");//查本机网络IP的网页
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(uri);
            req.Method = "POST";
            req.ContentType = "application/x-www-form-urlencoded";
            req.ContentLength = 0;
            req.CookieContainer = new CookieContainer();
            req.GetRequestStream().Write(new byte[0], 0, 0);
            HttpWebResponse res = (HttpWebResponse)(req.GetResponse());
            StreamReader rs = new StreamReader(res.GetResponseStream(), Encoding.GetEncoding("GB18030"));
            string s = rs.ReadToEnd();
            rs.Close();
            req.Abort();
            res.Close();
Match m = Regex.Match(Html, @"(?is)(?<=您的IP地址是)(?:(?!</?\]).)*(?=\])");
            if (m.Success)
            {
                return m.Value.Remove(0, 2);
            }
            else
            {
                return  "搜查中...";
            }
}

Answer 2

@"IP：\[(?<IP>[0-9\.]*)\]"-------------------
正则是否有问题，没匹配到

Answer 3

public static string GetIP()
        {
            Uri uri = new Uri("http://www.ip138.com/ips8.asp");//查本机网络IP的网页
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(uri);
            req.Method = "POST";
            req.ContentType = "application/x-www-form-urlencoded";
            req.ContentLength = 0;
            req.CookieContainer = new CookieContainer();
            req.GetRequestStream().Write(new byte[0], 0, 0);
            HttpWebResponse res = (HttpWebResponse)(req.GetResponse());
            StreamReader rs = new StreamReader(res.GetResponseStream(), Encoding.GetEncoding("GB18030"));
            string s = rs.ReadToEnd();
            rs.Close();
            req.Abort();
            res.Close();
Match m = Regex.Match(s, @"(?is)(?<=您的IP地址是)(?:(?!</?\]).)*(?=\])");
            if (m.Success)
            {
                return m.Value.Remove(0, 2);
            }
            else
            {
                return  "搜查中...";
            }
}

Answer 4

成功了，qlzf11140820可以解释一下原因吗？

Answer 5

那这段是什么意思啊？：m.Value.Remove(0, 2);