c# 获取客户端IP

        /// <summary>
        /// 获得当前页面客户端的ip
        /// </summary>
        /// <returns>当前页面客户端的ip</returns>
        public static string getip()
        {
            try
            {
                string result = string.empty;

                result = httpcontext.current.request.servervariables["http_x_forwarded_for"];
                if (string.isnullorempty(result))
                {
                    result = httpcontext.current.request.servervariables["remote_addr"];
                }

                if (string.isnullorempty(result))
                {
                    result = httpcontext.current.request.userhostaddress;
                }

                if (string.isnullorempty(result) || !utils.isip(result))
                {
                    return "127.0.0.1";
                }

                return result;
            }
            catch (exception ex)
            {
                system.diagnostics.trace.write(ex.message);
                return httpcontext.current.request.userhostaddress;
            }
        }