屬性的OnActionExecuted方法是否始終執行？

Question

我搜索了高和低，我似乎無法找到一個直接的答案。

如果我有一個自定義屬性/過濾器，將總是調用OnActionExecuted方法？即使有拋出異常？

Answer 1

至少在MVC 5中@tvanfosson的答案不再正確。這也適用於早期版本。

OnActionExecuted總是被調用並可以通過filterContext.Exception訪問拋出的異常。

測試用例與在動作異常：

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); 
    } 
} 

輸出：

Bar.OnActionExecuting 
Foo.OnActionExecuting 
Exception thrown: 'System.Exception' in WebApplication1.dll 
Foo.OnActionExecuted 
Has exception: True 
Bar.OnActionExecuted 
Has exception: True 

測試用例與例外在過濾器

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); 
    } 
} 

輸出：

Bar.OnActionExecuting 
Foo.OnActionExecuting 
Foo.OnActionExecuted 
Has exception: False 
Exception thrown: 'System.Exception' in WebApplication1.dll 
Bar.OnActionExecuted 
Has exception: True