Autofac解決IEnumerable <TComponent> 僅適用於實例化項目

Question

autofac是否為我提供了一種獲取組件的所有“活動”實例的方法？ 因此，以下工作：

public class ViewManager {

    public ViewManager(Func<IEnumerable<MyView>> viewProvider, Func<string, MyView> viewFactory) {
        ViewProvider = viewProvider;
        ViewFactory = viewFactory;
    }

    public Func<IEnumerable<MyView>> ViewProvider { get; private set; }
    public Func<string, MyView> ViewFactory { get; private set; }

    public MyView GetView(string viewId) {
        var existing = from view in ViewProvider() //this would get me all the active views (not the available implementations)
                       where !view.IsDisposed
                             && view.Id == viewId
                       select view;
        return existing.FirstOrDefault() ?? ViewFactory(viewId);
    }
}

public class MyView: IDisposable {
    public MyView(string id) {
        Id = id;
    }
    public string Id { get; private set; }
    public bool IsDisposed { get; private set; }
    public void Dispose() {
        IsDisposed = true;
    }
}

Answer 1

恐怕不是開箱即用的-對於這種情況，您需要提出另一種方案。 您可能可以使用OnActivated()和OnRelease()事件來保留自己的活動視圖注冊表：

builder.RegisterType<ViewRegistry>()
  .As<IViewRegistry>()
  .SingleInstance();

builder.RegisterType<MyView>()
  .OnActivated(e =>
     e.Context.Resolve<IViewRegistry>().Add(e.Instance))
  .OnRelease(e => {
     e.Instance.Dispose();
     e.Context.Resolve<IViewRegistry>().Remove(e.Instance))
  });