/// 
        /// 是否为ip        /// 
        ///         /// 
             public  bool IsIP(string ip)        {            return Regex.IsMatch(ip, @"^((2[0-4]\d|25[0-5]|[01]?\d\d?)\.){3}(2[0-4]\d|25[0-5]|[01]?\d\d?)$");        }        /// 
        /// 获取IP地址        /// 
        public string IPAddress        {            get            {                string userIP;                // HttpRequest Request = HttpContext.Current.Request;                HttpRequest Request = HttpContext.Current.Request; // ForumContext.Current.Context.Request;                // 如果使用代理，获取真实IP                if (Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != "")                    userIP = Request.ServerVariables["REMOTE_ADDR"];                else                    userIP = Request.ServerVariables["HTTP_X_FORWARDED_FOR"];                if (userIP == null || userIP == "")                    userIP = Request.UserHostAddress;                return userIP;            }        }        /*----------------------------------------------------------------------------------------------------------------*/