在OnActionExecuting中阻止后面Action的执行

1 阻止后续Action的执行：

        protected override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            var url = filterContext.HttpContext.Request.Path;
            if (url.Equals("/")) { url += string.Format("{0}/{1}", filterContext.ActionDescriptor.ControllerDescriptor.ControllerName, filterContext.ActionDescriptor.ActionName); }
            if (true)
            {
                Response.Write("<script language='javascript'>alert('您没有操作权限！');</script>");
            }

            //加了这句就不再走后面的Action
            filterContext.Result = new HttpNotFoundResult();
        }

2 弹出层无法弹出