public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            base.OnActionExecuting(filterContext);

            var url     = new UrlHelper(filterContext.RequestContext);
            var sysUser = filterContext.HttpContext.User as SysUser;

            if (sysUser == null || !sysUser.Identity.IsAuthenticated)
            {
                var requestUrl = filterContext.HttpContext.Request.RawUrl.ToLower();

                if (requestUrl.Contains(url.AdminHome().ToLower()))
                {
                    var loginUrl = url.Login();
                    filterContext.Result = new RedirectResult(loginUrl);
                    return;
                }
                var jsonModel = new JsonModel();
                jsonModel.statusCode = 301;
                jsonModel.message    = "请重新登录!";
                var result = new JsonResult();
                result.Data = jsonModel;
                result.JsonRequestBehavior = JsonRequestBehavior.AllowGet;
                filterContext.Result       = result;
            }
        }