我在MVC 3应用程序中使用Ninject
和扩展EventBroker和DependencyCreation。我已安装并使用Ninject.MVC3包,因此使用OnePerRequestModule
。
我正在尝试将名为IParentService
的服务注入控制器。 IParentService
依赖于通过DependencyCreation扩展创建的ChildService
(无硬引用)。
两个服务都在本地事件代理实例(ParentService
的本地)上注册。
我希望每个请求都限定IParentService
,我希望在IParentService
的同时处理依赖项和事件代理,但是,我得到{{1} }}。 我做错了什么?
一些代码:
服务定义:
ScopeDisposedException
内核注册(NinjectWebCommon)
public interface IParentService
{
}
public class ParentService : IParentService
{
[EventPublication("topic://ParentService/MyEvent")]
public event EventHandler<EventArgs> MyEvent;
}
public class ChildService
{
[EventSubscription("topic://ParentService/MyEvent", typeof(bbv.Common.EventBroker.Handlers.Publisher))]
public void OnMyEvent(object sender, EventArgs eventArgs)
{
}
}
堆栈跟踪:
private static void RegisterServices(IKernel kernel)
{
kernel.Bind<IParentService>().To<ParentService>()
.InRequestScope()
.OwnsEventBroker("ParentServiceBroker")
.RegisterOnEventBroker("ParentServiceBroker");
kernel.DefineDependency<IParentService, ChildService>();
kernel.Bind<ChildService>().ToSelf()
.WhenInjectedInto<ParentService>()
.InDependencyCreatorScope()
.RegisterOnEventBroker("ParentServiceBroker");
}
编辑 - 更详细信息
在对[ScopeDisposedException: The requested scope has already been disposed.]
Ninject.Extensions.NamedScope.NamedScopeExtensionMethods.GetScope(IContext context, String scopeParameterName) in c:\Projects\Ninject\ninject.extensions.namedscope\src\Ninject.Extensions.NamedScope\NamedScopeExtensionMethods.cs:118
Ninject.Extensions.NamedScope.NamedScopeExtensionMethods.GetScope(IContext context, String scopeParameterName) in c:\Projects\Ninject\ninject.extensions.namedscope\src\Ninject.Extensions.NamedScope\NamedScopeExtensionMethods.cs:126
Ninject.Extensions.NamedScope.<>c__DisplayClass1`1.<InNamedScope>b__0(IContext context) in c:\Projects\Ninject\ninject.extensions.namedscope\src\Ninject.Extensions.NamedScope\NamedScopeExtensionMethods.cs:40
Ninject.Planning.Bindings.BindingConfiguration.GetScope(IContext context) in c:\Projects\Ninject\ninject\src\Ninject\Planning\Bindings\BindingConfiguration.cs:119
Ninject.Planning.Bindings.Binding.GetScope(IContext context) in c:\Projects\Ninject\ninject\src\Ninject\Planning\Bindings\Binding.cs:224
Ninject.Activation.Context.GetScope() in c:\Projects\Ninject\ninject\src\Ninject\Activation\Context.cs:123
Ninject.Activation.Caching.Cache.TryGet(IContext context) in c:\Projects\Ninject\ninject\src\Ninject\Activation\Caching\Cache.cs:110
Ninject.Activation.Context.Resolve() in c:\Projects\Ninject\ninject\src\Ninject\Activation\Context.cs:150
Ninject.<>c__DisplayClass10.<Resolve>b__c(IBinding binding) in c:\Projects\Ninject\ninject\src\Ninject\KernelBase.cs:386
System.Linq.WhereSelectEnumerableIterator`2.MoveNext() +145
System.Linq.<CastIterator>d__b1`1.MoveNext() +85
System.Linq.Enumerable.Single(IEnumerable`1 source) +191
Ninject.ResolutionExtensions.Get(IResolutionRoot root, String name, IParameter[] parameters) in c:\Projects\Ninject\ninject\src\Ninject\Syntax\ResolutionExtensions.cs:50
Ninject.Extensions.ContextPreservation.ContextPreservationExtensionMethods.ContextPreservingGet(IContext context, String name, IParameter[] parameters) in c:\Projects\Ninject\ninject.extensions.contextpreservation\src\Ninject.Extensions.ContextPreservation\ContextPreservationExtensionMethods.cs:56
Ninject.Extensions.bbvEventBroker.<>c__DisplayClass2`1.<RegisterOnEventBroker>b__0(IContext ctx, T instance) in c:\Projects\Ninject\ninject.extensions.bbveventbroker\src\Ninject.Extensions.bbvEventBroker\EventBrokerExtensionMethods.cs:45
Ninject.Planning.Bindings.<>c__DisplayClass29`1.<OnDeactivation>b__28(IContext context, Object instance) in c:\Projects\Ninject\ninject\src\Ninject\Planning\Bindings\BindingConfigurationBuilder.cs:513
Ninject.Activation.Strategies.<>c__DisplayClass4.<Deactivate>b__3(Action`2 action) in c:\Projects\Ninject\ninject\src\Ninject\Activation\Strategies\BindingActionStrategy.cs:42
Ninject.Infrastructure.Language.ExtensionsForIEnumerableOfT.Map(IEnumerable`1 series, Action`1 action) in c:\Projects\Ninject\ninject\src\Ninject\Infrastructure\Language\ExtensionsForIEnumerableOfT.cs:32
Ninject.Activation.Strategies.BindingActionStrategy.Deactivate(IContext context, InstanceReference reference) in c:\Projects\Ninject\ninject\src\Ninject\Activation\Strategies\BindingActionStrategy.cs:42
Ninject.Activation.<>c__DisplayClass6.<Deactivate>b__4(IActivationStrategy s) in c:\Projects\Ninject\ninject\src\Ninject\Activation\Pipeline.cs:72
Ninject.Infrastructure.Language.ExtensionsForIEnumerableOfT.Map(IEnumerable`1 series, Action`1 action) in c:\Projects\Ninject\ninject\src\Ninject\Infrastructure\Language\ExtensionsForIEnumerableOfT.cs:32
Ninject.Activation.Pipeline.Deactivate(IContext context, InstanceReference reference) in c:\Projects\Ninject\ninject\src\Ninject\Activation\Pipeline.cs:72
Ninject.Activation.Caching.Cache.Forget(CacheEntry entry) in c:\Projects\Ninject\ninject\src\Ninject\Activation\Caching\Cache.cs:253
Ninject.Activation.Caching.Cache.Forget(IEnumerable`1 cacheEntries) in c:\Projects\Ninject\ninject\src\Ninject\Activation\Caching\Cache.cs:242
Ninject.Activation.Caching.Cache.Clear(Object scope) in c:\Projects\Ninject\ninject\src\Ninject\Activation\Caching\Cache.cs:197
Ninject.Web.Common.<>c__DisplayClass2.<DeactivateInstancesForCurrentHttpRequest>b__1(IKernel kernel) in c:\Projects\Ninject\Ninject.Web.Common\src\Ninject.Web.Common\OnePerRequestHttpModule.cs:74
Ninject.GlobalKernelRegistration.MapKernels(Action`1 action) in c:\Projects\Ninject\ninject\src\Ninject\GlobalKernelRegistration.cs:75
Ninject.Web.Common.OnePerRequestHttpModule.DeactivateInstancesForCurrentHttpRequest() in c:\Projects\Ninject\Ninject.Web.Common\src\Ninject.Web.Common\OnePerRequestHttpModule.cs:74
Ninject.Web.Common.OnePerRequestHttpModule.<Init>b__0(Object o, EventArgs e) in c:\Projects\Ninject\Ninject.Web.Common\src\Ninject.Web.Common\OnePerRequestHttpModule.cs:56
System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +136
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +69
的调用中设置的停用委托中抛出错误,其中代码尝试取消注册在事件代理上注册的任何对象。它失败是因为事件代理范围已被处理,可能是因为父服务已被处置。据我所知,Ninject只会为具有超出Transient范围的生命周期的对象调用OnDeactivation委托,所以当RegisterOnEventBroker
中注册父服务时,为什么这不起作用。对于父服务而言,瞬态范围是不够的,因为我遇到了由于此问题导致的内存泄漏。
我开始怀疑这是否是EventBroker扩展中的错误。
答案 0 :(得分:2)
您必须首先将IParentService
绑定到ParentService
,然后使用具体类型kernel.Bind<ParentService>().ToSelf()
的自绑定来定义对象范围和事件代理。
private static void RegisterServices(IKernel kernel)
{
kernel.Bind<IParentService>().To<ParentService>();
kernel.Bind<ParentService>().ToSelf()
.InRequestScope()
.OwnsEventBroker("ParentServiceBroker")
.RegisterOnEventBroker("ParentServiceBroker");
kernel.DefineDependency<IParentService, ChildService>();
kernel.Bind<ChildService>().ToSelf()
.WhenInjectedInto<ParentService>()
.InDependencyCreatorScope()
.RegisterOnEventBroker("ParentServiceBroker");
}
<强>编辑:强> 如果您要解析的类型是具体类型(如上面的ParentService),Ninject将通过称为隐式自绑定的机制自动创建默认关联。 像这样:
kernel.Bind<ParentService>().ToSelf();
另一方面,隐式自绑定在默认对象范围中生成,即Transient
。这就是您的代码无法在Request
范围内运行的原因。
有关详细信息,请参阅here
已编辑2:
bbvEventBroker
范围内的Request
扩展名中存在一个错误,导致在处理在该EventBroker上注册的对象之前处理了EventBroker。因此,在对象的OnDeactivation
方法中,没有EventBroker,可以调用其Unregister并抛出ScopeDisposedException
。
public static IBindingOnSyntax<T> OwnsEventBroker<T>(this IBindingOnSyntax<T> syntax, string eventBrokerName)
{
string namedScopeName = "EventBrokerScope" + eventBrokerName;
syntax.DefinesNamedScope(namedScopeName);
syntax.Kernel.Bind<IEventBroker>().To<EventBroker>().InNamedScope(namedScopeName).Named(eventBrokerName);
syntax.Kernel.Bind<IEventBroker>().ToMethod(ctx => ctx.ContextPreservingGet<IEventBroker>(eventBrokerName)).WhenTargetNamed(eventBrokerName);
return syntax;
}
您可以在OwnsEventBroker
方法中看到NamedScope定义的对象范围(ParentService
),它强制它在对象(ParentService
)之前进行处置。
另一方面,对象(OnDeactivation
)的ParentService
需要事先处理过的EventBroker。
public static IBindingOnSyntax<T> RegisterOnEventBroker<T>(
this IBindingOnSyntax<T> syntax, string eventBrokerName)
{
return
syntax.OnActivation((ctx, instance) => ctx.ContextPreservingGet<IEventBroker>(eventBrokerName).Register(instance))
.OnDeactivation((ctx, instance) => ctx.ContextPreservingGet<IEventBroker>(eventBrokerName).Unregister(instance));
}
EventBrokerExtensionMethods.cs
解决方案是使用NamedScope
创建对象树。在Request
范围内定义父级,同时为其子级(发布者/订阅者)定义NamedScope
并拥有事件代理(OwnsEventBroker
)。然后定义发布者(ChildService1
)和命名范围中的订阅者(ChildService2
)由父级定义。通过这种方式,您可以确保事件经纪人的所有者将在他们的孩子之后被处置。
答案 1 :(得分:2)
在停用对象本身之前,Ninject核心当前会停用对象范围内的对象。
更改订单似乎解决了这个问题。虽然在推动这一改变之前,我必须检查这可能会对其他情况产生什么副作用。