在autofacc中解析以接口作为类型参数的泛型

本文关键字：类型参数 泛型 接口 autofacc | 更新日期: 2023-09-27 18:18:56

在阅读了这里的大量文档和问题之后，我仍然被以下问题所困扰。这些是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>
{
}

注册如下，其中builder是一个ContainerBuilder实例，它更新一个中央IComponentRegistry:

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

现在可以工作了(其中_componentContext是一个IComponentContext实例):

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

这不会(抛出ComponentNotRegisteredException):

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

在不知道ITestService实现的情况下，解析如何工作?自

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

按预期工作，使用它的类型可能会被使用，但我还没有成功。

更新，异常细节:抛出的异常如下:

"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)
执行解析调用的代码实际上是在一个ASP的Execute()方法中。. NET MVC控制器

任何帮助都将非常感激!

在autofacc中解析以接口作为类型参数的泛型

不幸的是，您的Autofac版本有一个错误:作为泛型接口约束的泛型参数无法解析…

它已经被修复，应该在2.5.1。你必须升级才能使用这个功能。

或者您可以尝试其他解决方法:

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);
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