ASP.NET MVC 使用Filter過濾器 驗證用戶登錄狀態

1.在項目下新建一個Filters的文件夾,用於放網站所有的過濾器

2.新建一個過濾器類:CheckCustomerAttribute,繼承ActionFilterAttribute,重寫方法OnActionExecuting

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace ProductManagement.Filters
{
    public class CheckCustomerAttribute : ActionFilterAttribute  
    {
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            if (filterContext.HttpContext.Session["CustomerID"] == null)
            {
                filterContext.HttpContext.Response.Redirect("/login/index");
            }
        }
    }
}


3.在需要過濾的方法上面聲明一下就可以了

        [Filters.CheckCustomer]
        public ActionResult Index()
        {
            return View();
        }