MVC过滤器

<1>

MyActionFilterAttribute.cs类

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

namespace MvcApp.Models
{
    //ActionFilterAttribute这个类是继承了FilterAttribute类, 和IActionFilter, IResultFilter这两个接口的，就表名这个ActionFilterAttribute抽象类既是Action的过滤器，也是一个视图结果的过滤器（它下面有四个虚方法供我们重写）
    public class MyActionFilterAttribute:ActionFilterAttribute
    {
        public string ActionName { get; set; }


        //Action执行之前先执行此方法
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            base.OnActionExecuting(filterContext);
            HttpContext.Current.Response.Write("</br>OnActionExecuting---我在" + ActionName + "方法之前执行");
        }

        //Action执行之后执行此方法
        public override void OnActionExecuted(ActionExecutedContext filterContext)
        {
            base.OnActionExecuted(filterContext);
            HttpContext.Current.Response.Write("</br>OnActionExecuted---我在" + ActionName + "方法之后执行</br>");
        }

        //视图(ActionResult)执行之前，执行此方法
        public override void OnResultExecuting(ResultExecutingContext filterContext)
        {
            base.OnResultExecuting(filterContext);
            HttpContext.Current.Response.Write("</br>OnResultExecuting---我在" + ActionName+"方法的视图执行之前执行");
        }

        //视图(ActionRetult)执行之后，执行此方法
        public override void OnResultExecuted(ResultExecutedContext filterContext)
        {
            base.OnResultExecuted(filterContext);
            HttpContext.Current.Response.Write("</br>OnResultExecuted---我在" + ActionName+"方法的视图执行之后执行");
        }
    }
}

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

namespace MvcApp.Controllers
{
    public class TestController : Controller
    {
        //
        // GET: /Test/

        [MyActionFilter(ActionName = "Index")]
        public ActionResult Index()
        {
            Response.Write("<p style='color:Red' >Action方法被执行了</p>");
            return Content("<p style='color:Red' >OK 视图被渲染</p>");
        }

    }
}