Prism WPF中按名称解析接口的依赖关系

Question

我有一个要求，我需要在应用程序的不同页面之间共享 3 个 ZmqService 实例。为此，我注册了 IZmqService 接口，如下所示：-

container.RegisterInstance<IZmqService>("liveViewCaptureService", new ZmqService());
container.RegisterInstance<IZmqService>("faceMatchCaptureService", new ZmqService());
container.RegisterInstance<IZmqService>("captureServiceTrigger", new ZmqService());

现在，对于我的 viewModel，我已经解决了这样的问题：-

IZmqService liveViewCaptureService = container.Resolve<IZmqService>("liveViewCaptureService");
IZmqService faceMatchCaptureService = container.Resolve<IZmqService>("faceMatchCaptureService");
IZmqService captureServiceTrigger = container.Resolve<IZmqService>("captureServiceTrigger");

container.RegisterType<IManualVerificationPageViewModel, ManualVerificationPageViewModel>(
               new PerResolveLifetimeManager(),
               new InjectionConstructor(
                   new InjectionParameter<IRegionManager>(container.Resolve<IRegionManager>()),
                   new InjectionParameter<IEventAggregator>(container.Resolve<IEventAggregator>()),
                   new InjectionParameter<IDialogService>(container.Resolve<IDialogService>()),
                   new InjectionParameter<ICaptureService>(container.Resolve<ICaptureService>()),
                   new InjectionParameter<IAppConfiguration>(container.Resolve<IAppConfiguration>()),
                   new InjectionParameter<IMessageQueueService>(container.Resolve<IMessageQueueService>()),
                   new InjectionParameter(liveViewCaptureService),
                   new InjectionParameter(faceMatchCaptureService)
                   )
               );

在我的 XAML 中，我设置了 prism:ViewModelLocator.AutoWireViewModel="True"

我的视图模型的构造函数是：-

public ManualVerificationPageViewModel(
            IRegionManager regionManager,
            IEventAggregator eventAggregator,
            IDialogService dialogService,
            ICaptureService captureService,
            IAppConfiguration appConfiguration,
            IMessageQueueService messageQueueService,
            IZmqService liveViewCaptureService,
            IZmqService faceMatchCaptureService
            )
        {
            _regionManager = regionManager;
            _eventAggregator = eventAggregator;
            _dialogService = dialogService;
            _captureService = captureService;
            _appConfiguration = appConfiguration;
            _messageQueueService = messageQueueService;

            _liveViewCaptureService = liveViewCaptureService;
            _faceMatchCaptureService = faceMatchCaptureService;

            SelectIdentityCommand = new DelegateCommand(DoSelectIdentity);
            VerifyCommand = new DelegateCommand(DoVerify, CanVerify)
                .ObservesProperty(() => SelectedIdentityType)
                .ObservesProperty(() => IdentityNumber);

            CancelCommand = new DelegateCommand(DoCancel);
            RecaptureCommand = new DelegateCommand(DoRecapture);
        }

如果我尝试如下解析 App.xaml.cs 中的 ViewModel，

IManualVerificationPageViewModel vm = container.Resolve<IManualVerificationPageViewModel>();

我得到了一个有效的 ViewModel。但是当我的页面中发生 AutoWire 时，它​​会给出以下错误：-

ResolutionFailedException: Resolution of the dependency failed, type = 'NEC.AAI.EGate.Checkin.ViewModels.ManualVerificationPageViewModel', name = '(none)'.
Exception occurred while: while resolving.
Exception is: InvalidOperationException - The current type, NEC.AAI.EGate.Services.IZmqService, is an interface and cannot be constructed. Are you missing a type mapping?
-----------------------------------------------
At the time of the exception, the container was: 
  Resolving NEC.AAI.EGate.Checkin.ViewModels.ManualVerificationPageViewModel,(none)
  Resolving parameter 'liveViewCaptureService' of constructor NEC.AAI.EGate.Checkin.ViewModels.ManualVerificationPageViewModel(Prism.Regions.IRegionManager regionManager, Prism.Events.IEventAggregator eventAggregator, NEC.AAI.EGate.UI.Common.Services.IDialogService dialogService, NEC.AAI.EGate.Services.ICaptureService captureService, NEC.AAI.EGate.Services.IAppConfiguration appConfiguration, NEC.AAI.EGate.Services.MessageQueue.IMessageQueueService messageQueueService, NEC.AAI.EGate.Services.IZmqService liveViewCaptureService, NEC.AAI.EGate.Services.IZmqService faceMatchCaptureService)
    Resolving NEC.AAI.EGate.Services.IZmqService,(none)

如果我要注册这样的 IZmqService 类型，AutoWire 可以正常工作：-

IZmqService liveViewCaptureService = container.Resolve<IZmqService>("liveViewCaptureService");
IZmqService faceMatchCaptureService = container.Resolve<IZmqService>("faceMatchCaptureService");
IZmqService captureServiceTrigger = container.Resolve<IZmqService>("captureServiceTrigger");

container.RegisterType<IZmqService, ZmqService>(new InjectionConstructor());

但是这会为每个构造函数参数创建一个新的 IZmqService 实例，而不是使用注册的类型。

我在这里做错了什么？

Answer 1

好的。我得到了决议。

我所做的是将我的界面注册到视图模型，并且 AutoWireViewModel 和界面之间没有链接。

我要做的就是把它改成:-

container.RegisterType<ManualVerificationPageViewModel>(
                   new PerResolveLifetimeManager(),
                   new InjectionConstructor(
                       new InjectionParameter<IRegionManager>(container.Resolve<IRegionManager>()),
                       new InjectionParameter<IEventAggregator>(container.Resolve<IEventAggregator>()),
                       new InjectionParameter<IDialogService>(container.Resolve<IDialogService>()),
                       new InjectionParameter<ICaptureService>(container.Resolve<ICaptureService>()),
                       new InjectionParameter<IAppConfiguration>(container.Resolve<IAppConfiguration>()),
                       new InjectionParameter<IMessageQueueService>(container.Resolve<IMessageQueueService>()),
                       new InjectionParameter(container.Resolve<IZmqService>("liveViewCaptureService")),
                       new InjectionParameter(container.Resolve<IZmqService>("faceMatchCaptureService"))
                       )
                   );

而且效果很好。我仍在寻找如何将界面、视图和视图模型链接在一起。等我发现了再发。