System.Web.Mvc.FilterProviderCollection.GetFilters中的NullReferenceException

Question

我有一个在Windows 2008 R2(IIS 7.5)上运行的MVC 5应用程序(.NET 4.5.1)

运行负载测试时,会定期抛出以下异常.不幸的是,我无法在本地重现并且相当困难,所以我希望社区可以有更多的想法.(更新:现在能够在负载下重现)

查看FilterProviderCollection.GetFilters的源代码表明它可能是依赖项解析器 - 但是没有更多信息,我不愿意简单地替换库.目前它使用的是SimpleInjector.

如果是这种情况,我的猜测是由应用程序池回收引起的,但是无法确认这一点(在应用程序池中启用回收的所有原因的记录没有给我带来任何帮助)

经过多次搜索,我确实找到了一些可能是Glimpse的引用.我已经证实情况并非如此.我还剥离并重建了这个项目,以帮助人们获得信心,不仅仅是nuget-package升级怪异.

任何关于可能导致它的建议,或者我如何添加额外的日志以获取更多信息的任何建议将不胜感激.谢谢.

Exception information: 
    Exception type: NullReferenceException 
    Exception message: Object reference not set to an instance of an object.
   at System.Web.Mvc.FilterProviderCollection.GetFilters(ControllerContext controllerContext, ActionDescriptor actionDescriptor)
   at System.Web.Mvc.ControllerActionInvoker.GetFilters(ControllerContext controllerContext, ActionDescriptor actionDescriptor)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.BeginInvokeAction(ControllerContext controllerContext, String actionName, AsyncCallback callback, Object state)
   at System.Web.Mvc.Controller.<BeginExecuteCore>b__1c(AsyncCallback asyncCallback, Object asyncState, ExecuteCoreState innerState)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback, Object callbackState)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout)
   at System.Web.Mvc.Async.AsyncResultWrapper.Begin[TState](AsyncCallback callback, Object callbackState, BeginInvokeDelegate`1 beginDelegate, EndInvokeVoidDelegate`1 endDelegate, TState invokeState, Object tag, Int32 timeout, SynchronizationContext callbackSyncContext)
   at System.Web.Mvc.Controller.BeginExecuteCore(AsyncCallback callback, Object state)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout)
   at System.Web.Mvc.Async.AsyncResultWrapper.Begin[TState](AsyncCallback callback, Object callbackState, BeginInvokeDelegate`1 beginDelegate, EndInvokeVoidDelegate`1 endDelegate, TState invokeState, Object tag, Int32 timeout, SynchronizationContext callbackSyncContext)
   at System.Web.Mvc.Controller.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state)
   at System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__4(AsyncCallback asyncCallback, Object asyncState, ProcessRequestState innerState)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback, Object callbackState)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout)
   at System.Web.Mvc.Async.AsyncResultWrapper.Begin[TState](AsyncCallback callback, Object callbackState, BeginInvokeDelegate`1 beginDelegate, EndInvokeVoidDelegate`1 endDelegate, TState invokeState, Object tag, Int32 timeout, SynchronizationContext callbackSyncContext)
   at System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state)
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

更新1

我已经能够找到一种在测试环境中复制的方法:

1. 在应用程序上持续加载(少至20个虚拟用户)
2. 手动回收应用程序池(重复直到触发失败)

在没有负载的情况下回收应用程序池似乎不会触发失败.

更令人担忧的是,将"禁用重叠回收"设置为True并不会阻止它们发生.这个,我曾假设会停止任何回收问题,因为它在开始新的工作流程之前彻底撕下了工人流程.

更新2

Global.asax和相关配置看起来(对我来说)离默认模板太远了.看看你的想法？

    public class MyHttpApplication : HttpApplication {

            public MyHttpApplication() {
                    SimpleInjectorConfig.InitializeContainer(); //seems to need to be in ctor to support HttpModule dependencies
            }

            protected void Application_Start() {
                    MvcHandler.DisableMvcResponseHeader = true;

                    AreaRegistration.RegisterAllAreas();

                    ViewEngineConfig.RegisterViewEngines(ViewEngines.Engines);
                    WebApiConfig.Register(GlobalConfiguration.Configuration);
                    FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
                    RouteConfig.RegisterRoutes(RouteTable.Routes);
                    BinderConfig.RegisterGlobalBinders(ModelBinders.Binders);
            }

各种XxxConfig类几乎都不在模板之外.

    public static class FilterConfig {
            public static void RegisterGlobalFilters(GlobalFilterCollection filters) {
                    filters.Add(new AuthorizeAttribute());
            }
    }

    public static class SimpleInjectorConfig {
            /// <summary>Initialize the container and register it as MVC Dependency Resolver.</summary>
            public static void InitializeContainer() {
                    var container = new Container();
                    container.Options.AllowResolvingFuncFactories();

                    RegisterServices(container);

                    container.RegisterMvcControllers(Assembly.GetExecutingAssembly());
                    container.RegisterMvcIntegratedFilterProvider();
                    container.RegisterWebApiControllers(GlobalConfiguration.Configuration);

                    //container.Verify(); //see http://bit.ly/YE8OJj for more info

                    DependencyResolver.SetResolver(new SimpleInjectorDependencyResolver(container));
                    GlobalConfiguration.Configuration.DependencyResolver = new SimpleInjectorWebApiDependencyResolver(container);
            }

更新3

当关闭重叠循环运行时,我能够获得以下变量堆栈跟踪.

[IndexOutOfRangeException: Index was outside the bounds of the array.]
   System.Collections.Generic.Enumerator.MoveNext() +112
   System.Linq.<ConcatIterator>d__71`1.MoveNext() +643
   System.Linq.Buffer`1..ctor(IEnumerable`1 source) +520
   System.Linq.Enumerable.ToArray(IEnumerable`1 source) +103
   System.Web.Mvc.FilterProviderCollection.GetFilters(ControllerContext controllerContext, ActionDescriptor actionDescriptor) +89
   System.Web.Mvc.ControllerActionInvoker.GetFilters(ControllerContext controllerContext, ActionDescriptor actionDescriptor) +38
   System.Web.Mvc.Async.AsyncControllerActionInvoker.BeginInvokeAction(ControllerContext controllerContext, String actionName, AsyncCallback callback, Object state) +333
   System.Web.Mvc.Controller.<BeginExecuteCore>b__1c(AsyncCallback asyncCallback, Object asyncState, ExecuteCoreState innerState) +45
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback, Object callbackState) +111
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +150
   System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback, Object callbackState, BeginInvokeDelegate`1 beginDelegate, EndInvokeVoidDelegate`1 endDelegate, TState invokeState, Object tag, Int32 timeout, SynchronizationContext callbackSyncContext) +203
   System.Web.Mvc.Controller.BeginExecuteCore(AsyncCallback callback, Object state) +879
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +150
   System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback, Object callbackState, BeginInvokeDelegate`1 beginDelegate, EndInvokeVoidDelegate`1 endDelegate, TState invokeState, Object tag, Int32 timeout, SynchronizationContext callbackSyncContext) +154
   System.Web.Mvc.Controller.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state) +527
   System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__4(AsyncCallback asyncCallback, Object asyncState, ProcessRequestState innerState) +108
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback, Object callbackState) +111
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +150
   System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback, Object callbackState, BeginInvokeDelegate`1 beginDelegate, EndInvokeVoidDelegate`1 endDelegate, TState invokeState, Object tag, Int32 timeout, SynchronizationContext callbackSyncContext) +203
   System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state) +665
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +12638163
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +288

和

[IndexOutOfRangeException: Index was outside the bounds of the array.]
   System.Collections.Generic.Enumerator.MoveNext() +112
   System.Linq.<OfTypeIterator>d__aa`1.MoveNext() +344
   System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) +536
   System.Linq.Enumerable.ToList(IEnumerable`1 source) +80
   SimpleInjector.SimpleInjectorMvcExtensions.RegisterMvcIntegratedFilterProvider(Container container) +271
   WebProject.SimpleInjectorConfig.InitializeContainer() in c:\...\App_Start\SimpleInjectorConfig.cs:35
   WebProject.MyHttpApplication..ctor() in c:\...\Global.asax.cs:14
   ASP.global_asax..ctor() in c:\...\App_global.asax.3szzcx02.0.cs:0

[TargetInvocationException: Exception has been thrown by the target of an invocation.]
   System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck) +0
   System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) +159
   System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) +256
   System.Activator.CreateInstance(Type type, Boolean nonPublic) +127
   System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, StackCrawlMark& stackMark) +14259433
   System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes) +200
   System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture) +28
   System.Web.HttpRuntime.CreateNonPublicInstance(Type type, Object[] args) +83
   System.Web.HttpApplicationFactory.GetNormalApplicationInstance(HttpContext context) +246
   System.Web.HttpApplicationFactory.GetApplicationInstance(HttpContext context) +178
   System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +333

Answer 1

以下行给您带来了麻烦：

public MyHttpApplication() {
    SimpleInjectorConfig.InitializeContainer(); //seems to need to be in c...    
}

可以MyHttpApplication多次调用，这会导致创建多个容器，每个容器都尝试使用 来将自己注册为过滤器提供程序RegisterMvcIntegratedFilterProvider。您应该确保只为该应用程序域创建一个容器实例，这样您只需调用RegisterMvcIntegratedFilterProvider一次。