protected override void OnAuthorization(AuthorizationContext filterContext)
 {
            
            if (//开始权限验证返回bool)
            {
                filterContext.Result = new RedirectResult("/Home/index");
                return;
            }
             base.OnAuthorization(filterContext);
}

 public ActionResult Login()
        {
            if (用户Cookie > 0)
            { 
            //转向用户中心
            }
        }