解決autofac中帶有接口作爲類型參數的泛型

Question

閱讀大量文檔和問題後，我仍然堅持以下幾點。這些都是與Autofac註冊的接口/實現：

public interface ITestService<T> 
{ 
} 

public class TestService<T> : ITestService<T> 
{ 
} 

public interface ITest<TService, T> 
    where TService : ITestService<T> 
{ 
} 

public class Test<TService, T> : ITest<TService, T> 
    where TService : ITestService<T> 
{ 
} 

登記是如下，其中Builder是一個ContainerBuilder實例，並更新了中央IComponentRegistry：

builder.RegisterGeneric(typeof(TestService<>)).As(typeof(ITestService<>)).InstancePerLifetimeScope(); 

builder.RegisterGeneric(typeof(Test<,>)).As(typeof(ITest<,>)).InstancePerLifetimeScope(); 

現在這個工作（其中_componentContext是IComponentContext實例）：

_componentContext.Resolve<ITest<TestService<MyType>, MyType>>(); 

這不（投擲ComponentNotRegisteredException）：

_componentContext.Resolve<ITest<ITestService<TNodeToNodeConnectorRecord>, TNodeToNodeConnectorRecord>>(); 

如何解決可能不知道ITestService工作的實施有什麼建議？由於

_componentContext.Resolve<ITestService<MyType>>(); 

按預期工作，使用其類型可能會以某種方式使用，但我沒有成功。

更新，異常詳細信息： 引發的異常是如下：

"The requested service 'MyProject.ITest`2[[MyProject.ITestService`1[[MyProject.MyType, MyProject, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null]], MyProject, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null],[MyProject.MyType, MyProject, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null]]' has not been registered." 

堆棧跟蹤：

at Autofac.ResolutionExtensions.Resolve(IComponentContext context, Service service, IEnumerable`1 parameters) 
    at Autofac.ResolutionExtensions.Resolve(IComponentContext context, Type serviceType, IEnumerable`1 parameters) 
    at Autofac.ResolutionExtensions.Resolve[TService](IComponentContext context, IEnumerable`1 parameters) 
    at Autofac.ResolutionExtensions.Resolve[TService](IComponentContext context) 
    at MyProject.SomeController`4.Execute(RequestContext requestContext) in d:\SomeController.cs:line 55 
    at System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) 
    at System.Web.Mvc.MvcHandler.<>c__DisplayClass6.<>c__DisplayClassb.<BeginProcessRequest>b__5() 
    at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass1.<MakeVoidDelegate>b__0() 
    at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _) 
    at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`1.End() 
    at System.Web.Mvc.MvcHandler.<>c__DisplayClasse.<EndProcessRequest>b__d() 
    at System.Web.Mvc.SecurityUtil.<GetCallInAppTrustThunk>b__0(Action f) 
    at System.Web.Mvc.SecurityUtil.ProcessInApplicationTrust(Action action) 
    at System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) 
    at System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) 
    at Orchard.Mvc.Routes.ShellRoute.HttpAsyncHandler.EndProcessRequest(IAsyncResult result) in D:\MyProject.SomeRoutes.cs:line 148 
    at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() 
    at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) 

執行的決心調用的代碼實際上是在execute（）方法的ASP.NET MVC控制器。

任何幫助將不勝感激！

Answer 1

不幸的是，您的Autofac版本有一個bug：Generic parameters constrained as generic interfaces fail to resolve.。

它已被固定，據推測在2.5.1。您必須升級才能使用該功能。

或者你可以嘗試一種解決方法：

public interface ITestService<T> 
{ 
} 

public class TestService<T> : ITestService<T> 
{ 
} 

public interface ITest<T> 
{ 
    ITestService<T> TestService { get; } 
} 

public class Test<T> : ITest<T> 
{ 
    readonly ITestService<T> _TestService; 

    public Test(ITestService<T> testService) 
    { 
    _TestService = testService; 
    } 

    public ITestService<T> 
    { 
    get 
    { 
     return this._TestService; 
    } 
    } 
} 

builder.RegisterGeneric(typeof(TestService<>)).As(typeof(ITestService<>)).InstancePerLifetimeScope(); 
builder.RegisterGeneric(typeof(Test<>)).As(typeof(ITest<>)).InstancePerLifetimeScope(); 
... 

_componentContext.Resolve<ITest<TNodeToNodeConnectorRecord>>(); 

// if you need to specify the ITestService type to use: 
var testService = _componentContext.Resolve<TestService<TNodeToNodeConnectorRecord>>(); 
var test = _componentContext.Resolve<Func<ITestService<TNodeToNodeConnectorRecord>, ITest<TNodeToNodeConnectorRecord>>>()(testService);