// <summary>        ///  将127.0.0.1形式的IP地址转换成十进制整数        /// </summary>        /// <param name="strIp"></param>        /// <returns></returns>        public long IpToLong(string strIp)        {            long[] ip = new long[4];            int position1 = strIp.IndexOf(".");            int position2 = strIp.IndexOf(".", position1 + 1);            int position3 = strIp.IndexOf(".", position2 + 1);            // 将每个.之间的字符串转换成整型              ip[0] = long.Parse(strIp.Substring(0, position1));            ip[1] = long.Parse(strIp.Substring(position1 + 1, position2 - position1 - 1));            ip[2] = long.Parse(strIp.Substring(position2 + 1, position3 - position2 - 1));            ip[3] = long.Parse(strIp.Substring(position3 + 1));            //进行左移位处理            return (ip[0] << 24) + (ip[1] << 16) + (ip[2] << 8) + ip[3];        }        /// <summary>        /// 将十进制整数形式转换成127.0.0.1形式的ip地址         /// </summary>        /// <param name="ip"></param>        /// <returns></returns>        public string LongToIp(long ip)        {            StringBuilder sb = new StringBuilder();            //直接右移24位            sb.Append(ip >> 24);            sb.Append(".");            //将高8位置0，然后右移16            sb.Append((ip & 0x00FFFFFF) >> 16);            sb.Append(".");            //将高16位置0，然后右移8位            sb.Append((ip & 0x0000FFFF) >> 8);            sb.Append(".");            //将高24位置0            sb.Append((ip & 0x000000FF));            return sb.ToString();        }