ReactiveUI 中 IMutableDependencyResolver 和 Structuremap 的问题

Question

首先，让我说我不认为这是 ReactiveUI 本身的问题，这就是为什么我没有在其 github repo 上创建问题，其次，我意识到我正在使用ReactiveUI 的测试版。

我想使用 Structuremap，因为我将在我的 WPF 应用程序中有一个插件场景，而 Splat 中的 DI 容器不适合这种事情。

观察这些单元测试：

[Fact]
public void ShouldBeAbleToOverrideDefaultDependencyResolver()
{
    Locator.Current = new ApplicationDependencyResolver(StructureMapBootstrapper.Instance.Container);
    Locator.CurrentMutable.InitializeSplat();
    Locator.CurrentMutable.InitializeReactiveUI();

    var view = Locator.Current.GetService<SplashScreenView>();

    view.Should().NotBeNull().And.BeOfType<SplashScreenView>();
}

[Fact]
public void ShouldBeAbleToLocateTheViewForAViewModel()
{
    Locator.Current = new ApplicationDependencyResolver(StructureMapBootstrapper.Instance.Container);
    Locator.CurrentMutable.InitializeSplat();
    Locator.CurrentMutable.InitializeReactiveUI();
    var viewLocator = Locator.Current.GetService<IViewLocator>();

    var view = viewLocator.ResolveView(typeof (SplashScreenViewModel));

    view.Should().NotBeNull().And.BeOfType<SplashScreenView>();
}

第一个测试通过。第二个测试没有，并提供此堆栈跟踪：

StructureMap.StructureMapConfigurationExceptionNo default Instance is registered and cannot be automatically determined for type 'IViewFor<RuntimeType>'

There is no configuration specified for IViewFor<RuntimeType>

1.) Container.GetInstance(IViewFor<RuntimeType>)

   at StructureMap.SessionCache.GetDefault(Type pluginType, IPipelineGraph pipelineGraph) in c:\BuildAgent\work\996e173a8ceccdca\src\StructureMap\SessionCache.cs: line 63
   at StructureMap.Container.GetInstance(Type pluginType) in c:\BuildAgent\work\996e173a8ceccdca\src\StructureMap\Container.cs: line 325
   at Redacted.ApplicationDependencyResolver.GetService(Type serviceType, String contract) in ApplicationDependencyResolver.cs: line 27
   at ReactiveUI.DefaultViewLocator.attemptToResolveView(Type type, String contract)
   at ReactiveUI.DefaultViewLocator.ResolveView(T viewModel, String contract)
   at Redacted.BootstrapAndDependencyResolutionTests.ShouldBeAbleToLocateTheViewForAViewModel() in BootstrapAndDependencyResolutionTests.cs: line 39

我显然没有，也不可能有任何实现IViewFor<RuntimeType> 的视图。任何人都知道为什么会发生这种情况，以及我能做些什么来解决这个问题？我无法使用普通的 Structuremap 配置排除它。

为了清楚起见，这里是解析器和结构映射引导程序的实现：

    public class ApplicationDependencyResolver : IMutableDependencyResolver
{
    private readonly IContainer _container;

    public ApplicationDependencyResolver(IContainer container)
    {
        _container = container;
    }

    public void Dispose()
    {
        _container.Dispose();
    }

    public object GetService(Type serviceType, string contract = null)
    {
        return string.IsNullOrEmpty(contract)
            ? _container.GetInstance(serviceType)
            : _container.GetInstance(serviceType, contract);
    }

    public IEnumerable<object> GetServices(Type serviceType, string contract = null)
    {
        return _container.GetAllInstances(serviceType).Cast<object>();
    }

    public void Register(Func<object> factory, Type serviceType, string contract = null)
    {
        var o = factory();
        _container.Configure(configure => configure.For(serviceType).Use(o));
    }
}

    public sealed class StructureMapBootstrapper
{
    private static readonly StructureMapBootstrapper InternalInstance = new StructureMapBootstrapper();

    static StructureMapBootstrapper() { }

    private StructureMapBootstrapper()
    {
        Configure();
    }

    public static StructureMapBootstrapper Instance { get { return InternalInstance; } }

    public IContainer Container { get; private set; }

    private void Configure()
    {
        Container = new Container(configure =>
        {
            configure.Scan(with =>
            {
                with.TheCallingAssembly();
                with.LookForRegistries();
                with.WithDefaultConventions();
            });
        });
    }
}

Answer 1

经过一段时间的 ReactiveUI 单元测试，结果是失败的单元测试实际上没有正确实现，应该是这样的：

[Fact]
public void ShouldBeAbleToLocateTheViewForAViewModel()
{
    var container = StructureMapBootstrapper.Instance.Container;
    var ihas = container.WhatDoIHave();
    Locator.Current = new ApplicationDependencyResolver(container);
    Locator.CurrentMutable.InitializeSplat();
    Locator.CurrentMutable.InitializeReactiveUI();
    var vm = new SplashScreenViewModel();

    var viewLocator = Locator.Current.GetService<IViewLocator>();

    var view = viewLocator.ResolveView(vm);

    view.Should().NotBeNull().And.BeOfType<SplashScreenView>();
}

具体来说，导致测试失败的是我通过了typeof(SplashScreenViewMode)，而不是实例。

编辑：我还必须将 with.AddAllTypesOf(typeof (IViewFor<>)); 添加到 Structuremap 配置中。