[英]Does the OnActionExecuted method of an attribute always execute?
我搜索了高低,我似乎无法找到一个直接的答案。
如果我有自定义属性/过滤器,是否总是会调用OnActionExecuted
方法? 即使抛出异常?
至少在MVC 5中,@ tvanfosson的答案不再正确。 这也可能适用于早期版本。
始终调用OnActionExecuted
并通过filterContext.Exception
访问抛出的异常。
public class HomeController
: Controller
{
public ActionResult Index()
{
throw new Exception("Index");
}
}
public class FilterConfig
{
public static void RegisterGlobalFilters(GlobalFilterCollection filters)
{
filters.Add(new Foo());
filters.Add(new Bar());
}
}
public class Foo
: ActionFilterAttribute
{
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
Debug.WriteLine($"{nameof(Foo)}.{nameof(OnActionExecuting)}");
base.OnActionExecuting(filterContext);
}
public override void OnActionExecuted(ActionExecutedContext filterContext)
{
Debug.WriteLine($"{nameof(Foo)}.{nameof(OnActionExecuted)}");
Debug.WriteLine($"Has exception: {filterContext.Exception != null}");
base.OnActionExecuted(filterContext);
}
}
public class Bar
: ActionFilterAttribute
{
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
Debug.WriteLine($"{nameof(Bar)}.{nameof(OnActionExecuting)}");
base.OnActionExecuting(filterContext);
}
public override void OnActionExecuted(ActionExecutedContext filterContext)
{
Debug.WriteLine($"{nameof(Bar)}.{nameof(OnActionExecuted)}");
Debug.WriteLine($"Has exception: {filterContext.Exception != null}");
base.OnActionExecuted(filterContext);
}
}
输出:
Bar.OnActionExecuting
Foo.OnActionExecuting
Exception thrown: 'System.Exception' in WebApplication1.dll
Foo.OnActionExecuted
Has exception: True
Bar.OnActionExecuted
Has exception: True
public class HomeController
: Controller
{
public ActionResult Index()
{
return new HttpStatusCodeResult(200);
}
}
public class FilterConfig
{
public static void RegisterGlobalFilters(GlobalFilterCollection filters)
{
filters.Add(new Foo());
filters.Add(new Bar());
}
}
public class Foo
: ActionFilterAttribute
{
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
Debug.WriteLine($"{nameof(Foo)}.{nameof(OnActionExecuting)}");
base.OnActionExecuting(filterContext);
}
public override void OnActionExecuted(ActionExecutedContext filterContext)
{
Debug.WriteLine($"{nameof(Foo)}.{nameof(OnActionExecuted)}");
Debug.WriteLine($"Has exception: {filterContext.Exception != null}");
throw new Exception("Foo");
base.OnActionExecuted(filterContext);
}
}
public class Bar
: ActionFilterAttribute
{
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
Debug.WriteLine($"{nameof(Bar)}.{nameof(OnActionExecuting)}");
base.OnActionExecuting(filterContext);
}
public override void OnActionExecuted(ActionExecutedContext filterContext)
{
Debug.WriteLine($"{nameof(Bar)}.{nameof(OnActionExecuted)}");
Debug.WriteLine($"Has exception: {filterContext.Exception != null}");
base.OnActionExecuted(filterContext);
}
}
输出:
Bar.OnActionExecuting
Foo.OnActionExecuting
Foo.OnActionExecuted
Has exception: False
Exception thrown: 'System.Exception' in WebApplication1.dll
Bar.OnActionExecuted
Has exception: True
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