在SimpleInjector版本3中注册通用类型 [英] Register generic types in SimpleInjector Version 3

问题描述

我一直在关注非常有用的答案此处使用SimpleInjector DI动态地组织我的工作单元和存储库。

I've been following the very helpful answer here to organise my unit of work and repositories dynamically using SimpleInjector DI.

使用下面的测试服务：

public class TestService
{
    public TestService(IRepository<Call> calls){}       
}

在控制器中：

public class TestingController : Controller
{

    private readonly IUnitOfWork _unitOfWork ;

    public TestingController(IUnitOfWork unitOfWork, TestService testService)
    {
        _unitOfWork = unitOfWork;
    }
}

和引导程序：

public static class BootStrapper
{
    public static void ConfigureWeb(Container container)
    {
        container.Options.DefaultScopedLifestyle = new WebRequestLifestyle();
                    container.Options.ConstructorResolutionBehavior = new GreediestConstructorBehavior();


        container.Register<DbContext, OCISContext>(Lifestyle.Scoped);
        container.Register<ApplicationUserManager>(Lifestyle.Scoped);
        container.Register<ApplicationSignInManager>(Lifestyle.Scoped);
        container.Register<IAuthenticationManager>(() =>
            AdvancedExtensions.IsVerifying(container)
                ? new OwinContext(new Dictionary<string, object>()).Authentication
                : HttpContext.Current.GetOwinContext().Authentication, Lifestyle.Scoped);

        container.Register<IUserStore<ApplicationUser>, UserStore<ApplicationUser>>(Lifestyle.Scoped);

        container.Register<IUnitOfWork, UnitOfWork.UnitOfWork>(Lifestyle.Scoped);
        container.RegisterCollection(typeof(IRepository<>), typeof(IRepository<>).Assembly);
        container.Register<TestService>(Lifestyle.Scoped);
    }

我收到错误：

SimpleInjector.dll中发生类型'System.InvalidOperationException'的异常，但未在用户代码中处理

An exception of type 'System.InvalidOperationException' occurred in SimpleInjector.dll but was not handled in user code

其他信息：配置无效。创建类型为TestService的实例失败。类型为TestService的构造函数包含名称为 calls的参数，类型为未注册的 IRepository< Call> 。请确保已注册 IRepository< Call> ，或更改TestService的构造函数。但是，有一个 IEnumerable< IRepository< Call>> 的注册；您是要依靠 IEnumerable< IRepository< Call>> 吗？

Additional information: The configuration is invalid. Creating the instance for type TestService failed. The constructor of type TestService contains the parameter with name 'calls' and type IRepository<Call> that is not registered. Please ensure IRepository<Call> is registered, or change the constructor of TestService. There is, however, a registration for IEnumerable<IRepository<Call>>; Did you mean to depend on IEnumerable<IRepository<Call>>?

我已经还尝试过

container.RegisterCollection<IRepository>(new [] {typeof(IRepository)});
container.RegisterCollection(typeof(IRepository), new[] {typeof(IRepository)});

我的意图是获取GenericRepository的实例，因为它可以实现IRepository，如上面链接中的答案所示。

My intention is to get an instance of GenericRepository as this implents IRepository as shown in the answer in the link above.

推荐答案

您收到的异常消息实际上非常清楚（或者至少对我而言）：

The exception message you get is actually pretty clear (or at least, to me):

请确保已注册 IRepository< Call> ，或更改TestService的构造函数。但是，有一个 IEnumerable< IRepository< Call>> 的注册；您是要依靠 IEnumerable< IRepository< Call>> 吗？

Please ensure IRepository<Call> is registered, or change the constructor of TestService. There is, however, a registration for IEnumerable<IRepository<Call>>; Did you mean to depend on IEnumerable<IRepository<Call>>?

换句话说，您进行了以下注册：

In other words, you made the following registration:

container.RegisterCollection(typeof(IRepository<>), typeof(IRepository<>).Assembly);

RegisterCollection 表示可以将注册解析为采集。但是，您的 TestService 取决于 IRepository< Call> 而不是 IEnumerable< IRepository< Call>> ; 。

RegisterCollection means that registrations can be resolved as collection. Your TestService however depends on IRepository<Call> instead of IEnumerable<IRepository<Call>>.

因为我认为您的应用程序不太可能将多个实现用于 IRepository< Call> 同时，注册收藏可能不是您想要的；通用 IRepository< T> 接口的封闭版本与实现之间可能存在一对一的映射。

Since I think it is unlikely that your application will use multiple implementations for IRepository<Call> at the same time, registration of collections is probably not what you want; there is likely a one-to-one mapping between a closed version of the generic IRepository<T> interface and an implementation.

因此，请按以下方式进行注册：

So instead, make the registration as follows:

container.Register(typeof(IRepository<>), new[] { typeof(IRepository<>).Assembly });

这可确保一对一映射，并在意外地有更多实现的情况下引发异常对于相同的封闭通用类型。

This ensures the one-to-one mapping and will throw an exception in case there accidentally are more implementations for the same closed generic type.

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