依赖注入——这是它的本意吗?[关闭]

我们的项目正在使用基于构造函数的依赖注入(我们使用Unity作为容器),并且我们有许多构造函数获得了大量参数。

例如:

    public FooRequestService(
        ITransactionDataBuilder transactionDataBuilder,
        IMapper<SaveFooRequest, FooRequestMessage> saveFooRequestToFooRequestMapper,
        IFooRequestedThingRepository fooRequestedThingRepository,
        IFooRequestedThingBuilder fooRequestedThingBuilder,
        IMapper<IEnumerable<FooRequestedThing>, IEnumerable<FoundFooRequestedThing>> fooRequestedThingsToFoundFooRequestedThingsMapper,
        IAutomatedFooWcfService automatedFooService,
        IFooArrivalMessageProvider fooArrivalMessageProvider,
        ISeatCancellation cancellation,
        IPostSalesService postSalesService,
        ITransactionEnquiryService transactionService,
        IMapper<IEnumerable<FooRequestedThing>, List<ThingArrivedForFoo>> thingArrivalRequestDocumentMapper,
        IMapper<SaveFooRejected, FooRejectedMessage> saveFooRejectedToFooRejectedMapper,
        IPartialFooConfiguration partialFooConfiguration,
        ICurrentDateTimeProvider currentDateTimeProvider,
        IMapper<FooRequestMessage, List<FooRequested>> tracsFooRequestMapper,
        IThreeWayMerger<Transaction, TransactionService.Contract.Transaction, NotifyFooRequestedRequest, SaveFooRequest> saveFooRequestMerger,
        KioskWebServiceSoap kioskServiceGateway)
    {
        // code here to set injected values to member variables
    }

这个类总共有大约370行代码,表示系统的核心部分,因此有大量的依赖项。

• 从DI的角度来看,通常有这么多参数传递给构造函数吗?
• 一般方法从封装和范围方面与我有关。所有依赖项都可以从类内的任何地方使用,即使它们(严格地说)只能从单个方法(例如)使用