用Structuremap修饰一个通用接口

我有一个泛型接口，它接受两个泛型类型。我想装饰返回的所有版本，但由于我不知道调用充实时的类型，它显然不编译。我试过使用在上下文中传递的enrichment with重载，认为也许我可以抓住传递进来的泛型类型并调用Activator。创建实例，但在调试和检查它时，上下文没有任何有用的信息。

这是我目前所知道的。这是我的通用接口:

public interface IServiceOperation<in TRequest, out TResponse> where TResponse : ServiceResult, new()
{
    TResponse PerformService(TRequest validatedRequest);
}

下面是一个示例实现:

public class SignUpService : IServiceOperation<SignUpRequest, SignUpResult>
{
    private readonly IUserRepository _userRepo;
    public SignUpService(IUserRepository userRepo)
    {
        _userRepo = userRepo;
    }
    public SignUpResult PerformService(SignUpRequest validatedRequest)
    {
        var user = Mapper.Map<User>(validatedRequest);
        user.MarkAsLoggedIn();
        user.ChangePassword(validatedRequest.UnhashedPassword);
        using(var transaction = _userRepo.BeginTransaction())
        {
            _userRepo.Save(user);
            transaction.Commit();
        }
        return new SignUpResult();
    }
}

这是我的装饰器，它也接受了另一个服务:

public class ValidateServiceDecorator<TRequest, TResponse> : IServiceOperation<TRequest, TResponse> where TResponse : ServiceResult, new()
{
    private readonly IServiceOperation<TRequest, TResponse> _serviceOperation;
    private readonly IValidationService _validationService;
    public ValidateServiceDecorator(IServiceOperation<TRequest, TResponse> serviceOperation,
        IValidationService validationService)
    {
        _serviceOperation = serviceOperation;
        _validationService = validationService;
    }
    public TResponse PerformService(TRequest request)
    {
        var response = new TResponse();
        var validationResult = _validationService.Validate(request);
        if (!validationResult.IsValid)
        {
            response.ValidationErrors = validationResult.ValidationErrors;
            return response;
        }
        return _serviceOperation.PerformService(request);
    }

最后，这里是我在容器上运行的距离。这显然不会编译，但富集与行显示了我想要实现的:

public class StructureMapServiceScanner : Registry
{
    public StructureMapServiceScanner()
    {
        Scan(scanner =>
                {
                    scanner.AssemblyContainingType(typeof (IServiceOperation<,>));
                    scanner.ConnectImplementationsToTypesClosing(typeof (IServiceOperation<,>));
                });
        For(typeof (IServiceOperation<,>))
        .EnrichWith((ioc, original) => new ValidateServiceDecorator(original, ioc.GetInstance<IValidationService>()));
    }
}

因为这个问题需要更多的代码，下面是我想要通过的测试:

[TestClass]
public class StructureMapServiceScannerSpecs
{
    [TestMethod]
    public void Test()
    {
        ObjectFactory.Configure(cfg =>
                                    {
                                        cfg.AddRegistry<StructureMapServiceScanner>();
                                        cfg.For<IUserRepository>().Use(new Mock<IUserRepository>().Object);
                                        cfg.For<IValidationService>().Use(new Mock<IValidationService>().Object);
                                    });
        var service = ObjectFactory.GetInstance<IServiceOperation<SignUpRequest, SignUpResult>>();
        service.ShouldNotBeNull();
        service.ShouldBeType<ValidateServiceDecorator<SignUpRequest, SignUpResult>>();
    }
}

我觉得这应该是简单的东西，我真的错过了如何使用StructureMap的东西。我可以为Request和Response类型的所有组合创建特定类型的版本，但显然这是不可取的。那么我错过了什么呢?

public class ServiceRegistrationConvention : IRegistrationConvention
{
    public void Process(Type type, Registry registry)
    {
        var interfacesImplemented = type.GetInterfaces();
        foreach (var interfaceImplemented in interfacesImplemented)
        {
            if (interfaceImplemented.IsGenericType && interfaceImplemented.GetGenericTypeDefinition() == typeof(IServiceOperation<,>))
            {
                var genericParameters = interfaceImplemented.GetGenericArguments();
                var closedValidatorType = typeof(ValidateServiceDecorator<,>).MakeGenericType(genericParameters);
                registry.For(interfaceImplemented)
                    .EnrichWith((context, original) => Activator.CreateInstance(closedValidatorType, original,
                                                                                context.GetInstance<IValidationService>()));
            }
        }
    }
}

public class ServiceRegistrationConvention : IRegistrationConvention
{
    public void Process(Type type, Registry registry)
    {
        var handlerInterfaces = (from t in type.GetInterfaces()
                                 where t.IsGenericType &&
                                       t.GetGenericTypeDefinition() == typeof (IHandle<,>)
                                 select t);
        foreach (var handler in handlerInterfaces)
        {
            var decoratorType = typeof (ValidationDecorator<,>).MakeGenericType(handler.GetGenericArguments());
            registry.For(handler)
                .EnrichWith((ctx, orig) => ObjectFactory.With(handler, orig).GetInstance(decoratorType));
        }
    }
}