通过向网站http://www.ip138.com/ip2city.asp发送webrequest，分析返回的数据流

          /// <summary>
        /// 获取服务器网络IP
        /// </summary>
        /// <returns>IP</returns>
        private string GetHostNetIP()
        {
            string strIP=string.Empty;
            try
            {
                string strUrl = "http://www.ip138.com/ip2city.asp";//获取IP的网站
                Uri uri = new Uri(strUrl);
                System.Net.WebRequest request = System.Net.WebRequest.Create(uri);
                System.IO.Stream stream = request.GetResponse().GetResponseStream();
                System.IO.StreamReader sr = new System.IO.StreamReader(stream, Encoding.Default);
                string strData = sr.ReadToEnd();//读取网站返回的数据 格式:您的IP地址是：[255.240.33.120]
                int startIndex=strData.IndexOf("[")+1;
                int endIndex=strData.IndexOf("]");
                strIP = strData.Substring(startIndex, endIndex-startIndex);
            }
            catch (Exception ex)
            {
                strIP="获取IP失败！";
                Console.WriteLine(ex.Message);
            }
            return strIP;
        }

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