.NET程序访问网页,返回网页內容

  .NET程序访问网页，返回当前的动态IP

返回IP的正则表达式：/[(?<IP>[0-9/.]*)/]

        public string returnWebIP(string URL, string regExpStr)

        {

            Uri uri = new Uri(URL);

            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, regExpStr);

            if (m.Success) return m.Groups["IP"].Value;

            string strnetIP = string.Empty;

            return strnetIP;

        }