asp.net mvc4 过滤器的简单应用：登录验证

直接上代码，不要说话。

ASP.NET MVC4过滤器的简单应用：验证登录

   [AcceptVerbs(HttpVerbs.Post)]
        public ActionResult login(FormCollection form)
        {
            Session["login"] = "True";
            return Redirect("/Home/Index");

        }

        [IsLogin]
        public ActionResult Index() 
        {
            return View();
        }

  //自定义过滤器
    public class IsLogin : ActionFilterAttribute
    {  
        //当方法执行时
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            //base.OnActionExecuting(filterContext);
            try
            {  var sess=filterContext.RequestContext.HttpContext.Session["login"];
                if (sess==null  ||sess.ToString()!="True")
                    filterContext.Result = new RedirectResult("/Home/login");
            }
            catch
            {
                filterContext.Result = new RedirectResult("/Shared/Error");
            }
        }

        //当方法执行完毕
        public override void OnActionExecuted(ActionExecutedContext filterContext)
        {
            base.OnActionExecuted(filterContext);
        }
    }