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所以我有這樣一個類從我試圖導入某些構造函數：MEF - 沒有找到相匹配的出口的約束
[Export]
public partial class MainWindow
{
private readonly MainWindowViewModel _viewModel;
private readonly IEnumerable<IApplicationClosingListener> _applicationClosingListeners;
private readonly Lazy<IPreferencesRepository> _preferencesRepository;
[ImportingConstructor]
public MainWindow(MainWindowViewModel viewModel, IViewManager viewManager, [ImportMany] IEnumerable<IApplicationClosingListener> applicationClosingListeners, Lazy<IPreferencesRepository> preferencesRepository)
{
_doStuff();
}
}
我也導出所有我想要的類進口（MainWindowViewModel,IViewManager和IPreferencesRepository）。我這個做這樣：
MainWindowViewModel和IViewManager類：
[Export]
[Export(typeof(IViewManager))]
[Export(typeof(IMessagePresenter))]
public class MainWindowViewModel : BaseViewModel, IViewManager, IApplicationClosingListener
{
[ImportingConstructor]
public MainWindowViewModel(
Lazy<IPreferencesRepository> preferencesRepository)
{
_doStuff();
}
最後，IPreferencesRepository類：
[Export(typeof(IPreferencesRepository))]
public class PreferencesRepository : IPreferencesRepository
{
private readonly IPreferencesStorage _preferencesStorage;
[ImportingConstructor]
public PreferencesRepository(IPreferencesStorage preferencesStorage, IPreferencesSerializer preferencesSerializer)
{
_doStuff();
}
現在，當我試圖獲得並使用出口出現問題MainWindow分類：
var container = new CompositionContainer(new ApplicationCatalog());
container.ComposeExportedValue((IApplication)this);
var mainWindow = container.GetExport<MainWindow>(); // here the exception is thrown.
ImportCardinalityMismatchException被拋出。此外，在調試控制檯中，我收到三條消息，告訴我「未找到與約束匹配的導出」。
我錯過了什麼？