Tool

/// <summary>
        /// 是否为ip
        /// </summary>
        /// <param name="ip"></param>
        /// <returns></returns>
        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?)$");
        }

        /// <summary>
        /// 获取IP地址
        /// </summary>
        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;
            }
        }

        /*----------------------------------------------------------------------------------------------------------------*/