asp.net mvc中的用户登录验证过滤器

 在WEB项目中建立 类：

     public class LoginFilter : ActionFilterAttribute

    {

        public override void OnActionExecuting(ActionExecutingContext filterContext)

        {

            //HttpContext.Current.Response.Write("OnActionExecuting:正要准备执行Action的时候但还未执行时执行<br />");

            if (HttpContext.Current.Session"admin" == null)

            {

                //HttpContext.Current.Response.Write("js代码");
                //HttpContext.Current.Response.End();
                //return;

                var context = new ContentResult();
                context.Content = "<script>alert('请重新登录！');location.href='/Login/Index'</script>";

                filterContext.Result = context;

 

            }

        }

 

        public override void OnActionExecuted(ActionExecutedContext filterContext)

        {

            //HttpContext.Current.Response.Write("OnActionExecuted:Action执行时但还未返回结果时执行<br />");

        }

 

        public override void OnResultExecuting(ResultExecutingContext filterContext)

        {

            // HttpContext.Current.Response.Write("OnResultExecuting:OnResultExecuting也和OnActionExecuted一样，但前者是在后者执行完后才执行<br />");

        }

 

        public override void OnResultExecuted(ResultExecutedContext filterContext)

        {

            // HttpContext.Current.Response.Write("OnResultExecuted:是Action执行完后将要返回ActionResult的时候执行<br />");

        }

    }

 

 

使用方法，直接在控制里方法外面写，如：

     [LoginFilter]
        public ActionResult Add()
        {
            Model.Userinfo loginuser = base.GetLoginUser();
            Model.Product pro = new Model.Product() { userid = loginuser.id, username = loginuser.username };
            return View(pro);
        }