获取ip

 #region 获得客户端IP

        /// <summary>
        /// 获得客户端IP
        /// </summary>
        /// <returns></returns>
        public string GetClientIp()
        {
            var ip = "127.0.0.1";
            //穿过代理服务器取远程用户真实IP地址
            if (HttpContext.Current == null
                || HttpContext.Current.Request == null
                || HttpContext.Current.Request.ServerVariables == null)
            {
            }
            //CDN加速后取到的IP     
            else if (HttpContext.Current.Request.Headers["Cdn-Src-Ip"] != null)
            {
                ip = HttpContext.Current.Request.Headers["Cdn-Src-Ip"];
            }
            else if (HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != null)
            {
                ip = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();
            }
            else if (HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"] != null)
            {
                ip = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"].ToString();
            }
            else if (HttpContext.Current.Request.ServerVariables["HTTP_CLIENT_IP"] != null)
            {
                ip = HttpContext.Current.Request.ServerVariables["HTTP_CLIENT_IP"].ToString();
            }
            else if (HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"] != null)
            {
                ip = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"].ToString();
            }
            else
            {
                ip = HttpContext.Current.Request.UserHostAddress;
            }
            return ip;
        }

        #endregion 获得客户端IP