MVC-过滤器

过滤器有4种

类别	实现接口	默认类实现	说明
Authorization	IAuthorizationFilter	AuthorizeAttribute	在所有的Action之前以及所有的过滤器运行之前执行，实现权限验证
Action	IActionFilter	ActionFilterAttribute	在Action将要执行和执行后运行，但是在Result之前
Result	IResultFilter	ActionFilterAttribute	在将要返回Result之前和之后运行
Exception	IExceptionFilter	HandleErrorAttribute	在执行Filter和Action过程中出现异常时运行，可用于异常处理

　　因为Controller类也实现了上面的4个接口 IActionFilter, IAuthorizationFilter, IExceptionFilter, IResultFilter，因此在Controller类中，也可以实现对应的方法。执行顺序如下：

　　

[MyAuthorizationFilter]
    [MyActionFilter]
    public class IndexController : Controller
    {
      
        public ActionResult Index()
        {
            Response.Write("我是IndexController中的Index<hr />");
            return View();
        }

        protected override void OnAuthorization(AuthorizationContext filterContext)
        {
            filterContext.HttpContext.Response.Write("我是IndexController中的OnAuthorization<hr />");
            base.OnAuthorization(filterContext);
        }

        protected override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            filterContext.HttpContext.Response.Write("我是IndexController中的OnActionExecuting<hr />");
            base.OnActionExecuting(filterContext);
        }

        protected override void OnActionExecuted(ActionExecutedContext filterContext)
        {
            filterContext.HttpContext.Response.Write("我是IndexController中的OnActionExecuted<hr />");
            base.OnActionExecuted(filterContext);
        }

        protected override void OnResultExecuting(ResultExecutingContext filterContext)
        {
            filterContext.HttpContext.Response.Write("我是IndexController中的OnResultExecuting<hr />");
            base.OnResultExecuting(filterContext);
        }

        protected override void OnResultExecuted(ResultExecutedContext filterContext)
        {
            filterContext.HttpContext.Response.Write("我是IndexController中的OnActionExecuted<hr />");
            base.OnResultExecuted(filterContext);
        }
    }

 public class MyActionFilter : ActionFilterAttribute
    {
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            filterContext.HttpContext.Response.Write("我是MyActionFilter中的OnActionExecuting<hr />");
            base.OnActionExecuting(filterContext);
        }

        public override void OnActionExecuted(ActionExecutedContext filterContext)
        {
            filterContext.HttpContext.Response.Write("我是MyActionFilter中的OnActionExecuted<hr />");
            base.OnActionExecuted(filterContext);
        }

        public override void OnResultExecuting(ResultExecutingContext filterContext)
        {
            filterContext.HttpContext.Response.Write("我是MyActionFilter中的OnResultExecuting<hr />");
            base.OnResultExecuting(filterContext);
        }

        public override void OnResultExecuted(ResultExecutedContext filterContext)
        {
            filterContext.HttpContext.Response.Write("我是MyActionFilter中的OnResultExecuted<hr />");
            base.OnResultExecuted(filterContext);
        }
    }

 public class MyAuthorizationFilter:AuthorizeAttribute
    {
        public override void OnAuthorization(AuthorizationContext filterContext)
        {
            filterContext.HttpContext.Response.Write("我是MyAuthorizationFilter中的OnAuthorization<hr />");
           return;
        }

    }

全局Controller配置，在Controller级中添加，对应的Action放在对应的Action级中添加。如果是整个项目注册，是在App_Start中FilterConfig中配置。