asp.net mvc之过滤器

先看一段实例

public class Log : FilterAttribute, IActionFilter
    {
        public void OnActionExecuted(ActionExecutedContext filterContext)
        {
            Console.WriteLine("log-after");
        }

        public void OnActionExecuting(ActionExecutingContext filterContext)
        {
            Console.WriteLine("log-before");
        }
    }

public class HomeController : Contoller
    {
        [Log]
        public ActionResult Index()
        {
            return View();
        }
    }

MVC有四种过滤器

ActionFilter（方法过滤器）：实现接口：[IActionFilter]；在Action调用前和调用后执行

ResultFilter（结果过滤器）：实现接口：[IResultFilter]；在Action Result调用完，跳转至view页面前/后执行

AuthorizationFilter（授权过滤器）：实现接口：[IauthorizationFilter]；所有过滤器中最先执行的

ExceptionFilter（异常处理过滤器）：实现接口:[IExceptionFilter]:在控制器方法抛出异常时执行

应用场景

public class FilterConfig
    {
        public static void RegisterGlobalFilters(GlobalFilterCollection filters)
        {
            filters.Add(new HandleErrorAttribute());
            filters.Add(new MyAuthorAttribute());
            filters.Add(new ExceptionFilter());//异常过滤器
        }
    }

public class MyAuthorAttribute : FilterAttribute, IAuthorizationFilter
    {
        public void OnAuthorization(AuthorizationContext filterContext)
        {  
///
        }
    }

Global实现全局

//实现全局
FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);