mvc 过滤器

1.mvc 过滤器分为 授权-行为-异常

2.授权，自定义授权。先走OnAuthorization,然后内部调用AuthorizeCore方法，如果返回true 就跳转指定的路径，如果返回false 就内部跳转到授权异常HandleUnauthorizedRequest方法。

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

namespace 过滤器.Filter {
    public class MYAuthorization : AuthorizeAttribute {

        public override void OnAuthorization(AuthorizationContext filterContext) {
            base.OnAuthorization(filterContext);
        }
        protected override bool AuthorizeCore(HttpContextBase httpContext) {
            var v=CookieHelper.GetCookie("aa");
            if (v == "") {
                return false;
            }
            else {
                return true;
            }
        }
        protected override void HandleUnauthorizedRequest(AuthorizationContext filterContext) {
            //filterContext.Result = new JsonResult() { Data = new { AuthorizeMessage = "您需要登陆"}, JsonRequestBehavior = JsonRequestBehavior.AllowGet };
            filterContext.Result = new RedirectResult("/Login/Index?ReturnUrl=" + filterContext.HttpContext.Request.Url.ToString().Replace(filterContext.HttpContext.Request.Url.Port.ToString(), string.Empty));
        }
        protected override HttpValidationStatus OnCacheAuthorization(HttpContextBase httpContext) {
            string l = "sss";
            return HttpValidationStatus.Invalid;
        }
    }
}

3.异常筛选器

  只要是有报错就会走这个方法，并且会跳转到指定的页面

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

namespace 过滤器.Filter {
    public class MYHandleErrorAttribute : HandleErrorAttribute {
        public override void OnException(ExceptionContext filterContext) {
            if (!filterContext.ExceptionHandled) {
                filterContext.ExceptionHandled = true;
                filterContext.Result = new ViewResult() { ViewName = "/Views/Shared/MyError.cshtml" };
            }
        }
    }
}

4.行为过滤器

MYActionFilter 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
namespace 过滤器.Filter {
    public class MYActionFilter : ActionFilterAttribute {

        public override void OnActionExecuted(ActionExecutedContext filterContext) {

        }
        public override void OnActionExecuting(ActionExecutingContext filterContext) {

        }
        public override void OnResultExecuted(ResultExecutedContext filterContext) {
        }
        public override void OnResultExecuting(ResultExecutingContext filterContext) {

        }
    }
}