LiuLyndon Look For: [MVC] Action Filter

Action Filter 主要有下列的功能

Cross-cutting concerns

Authorization
Logging
Caching

Built-in Action Filter

Authorize
Action
HandleError

設計 Filter：繼承 ActionFilterAttribute

ActionFilterAttribute 提供下列四種方法

OnActionExecuting – Action 之前執行
OnActionExecuted – Action 之後執行
OnResultExecuting – Action Result 之前執行
OnResultExecuted – Action Result 之後執行

步驟1：創建 LogActionFilter

步驟2：使用 ActionFilterAttribute


using System.Web.Mvc;
using System.Diagnostics;
using System.Web.Routing;

namespace DemoError.LogAction
{
    public class LogActionFilter:ActionFilterAttribute
    {
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            Log("OnActionExecuting", filterContext.RouteData);
        }

        public override void OnActionExecuted(ActionExecutedContext filterContext)
        {
            Log("OnActionExecuted", filterContext.RouteData);
        }

        public override void OnResultExecuting(ResultExecutingContext filterContext)
        {
            Log("OnResultExecuting", filterContext.RouteData);
        }

        public override void OnResultExecuted(ResultExecutedContext filterContext)
        {
            Log("OnResultExecuted", filterContext.RouteData);
        }

        private void Log(string methodName, RouteData routeData)
        {
            var controllerName = routeData.Values["controller"];
            var actionName = routeData.Values["action"];
            Debug.WriteLine(string.Format($"{methodName}: controller:{controllerName}, action:{actionName} "));
        }
    }
}

步驟3：使用 LogActionFilter

HomeController Index 加入 [LogActionFilter]

using DemoError.LogAction;
using System.Web.Mvc;

namespace DemoError.Controllers
{
    public class HomeController : Controller
    {
        [LogActionFilter]
        public ActionResult Index()
        {
            return View();
        }

        public ActionResult About()
        {
            ViewBag.Message = "Your application description page.";

            return View();
        }

        public ActionResult Contact()
        {
            ViewBag.Message = "Your contact page.";

            return View();
        }
    }
}

步驟3-1

如果需使整 Controller 都使用 LogActionFilter，調整 [LogActionFilter] 至 Controller 頂端

using DemoError.LogAction;
using System.Web.Mvc;

namespace DemoError.Controllers
{
    [LogActionFilter]
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return View();
        }

        public ActionResult About()
        {
            ViewBag.Message = "Your application description page.";

            return View();
        }

        public ActionResult Contact()
        {
            ViewBag.Message = "Your contact page.";

            return View();
        }
    }
}

步驟3-2

如果需使整個網站都使用 LogActionFilter，需再 Global.asax 中 Application_Start 進行註冊


using DemoError.LogAction;
using System.Web.Mvc;
using System.Web.Optimization;
using System.Web.Routing;

namespace DemoError
{
    public class MvcApplication : System.Web.HttpApplication
    {
        protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);
            // 事件註冊
            GlobalFilters.Filters.Add(new LogActionFilter());
        }
    }
}

REF：

LiuLyndon Look For

2017年9月8日星期五

[MVC] Action Filter

沒有留言:

張貼留言

2017年9月8日 星期五

[MVC] Action Filter

沒有留言:

張貼留言

2017年9月8日星期五