获取ip地址函数

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