解决autofac中带有接口作为类型参数的泛型

Question

阅读大量文档和问题后，我仍然坚持以下几点。这些都是与Autofac注册的接口/实现：

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> 
{ 
} 

登记是如下，其中Builder是一个ContainerBuilder实例，并更新了中央IComponentRegistry：

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

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

现在这个工作（其中_componentContext是IComponentContext实例）：

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

这不（投掷ComponentNotRegisteredException）：

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

如何解决可能不知道ITestService工作的实施有什么建议？由于

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

按预期工作，使用其类型可能会以某种方式使用，但我没有成功。

更新，异常详细信息： 引发的异常是如下：

"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." 

堆栈跟踪：

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) 

执行的决心调用的代码实际上是在execute（）方法的ASP.NET MVC控制器。

任何帮助将不胜感激！

Answer 1

不幸的是，您的Autofac版本有一个bug：Generic parameters constrained as generic interfaces fail to resolve.。

它已被固定，据推测在2.5.1。您必须升级才能使用该功能。

或者你可以尝试一种解决方法：

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);