Caliburn.Micro DisplayRootViewFor抛出NullReferenceException

Question

我的Bootstrapper中有以下代码:

private SimpleContainer container;

protected override void Configure()
{
  container = new SimpleContainer();
  container.Singleton<IEventAggregator, EventAggregator>();
  container.PerRequest<InitialViewModel>();  
}

protected override object GetInstance(Type service, string key)
{
  return container.GetInstance(service, key);
}

protected override IEnumerable<object> GetAllInstances(Type service)
{
  return container.GetAllInstances(service);
}

protected override void BuildUp(object instance)
{
  container.BuildUp(instance);
}

在OnStartup方法中,我调用该DisplayRooViewFor方法:

protected override void OnStartup(object sender, StartupEventArgs e)
{ 
  DisplayRootViewFor<InitialViewModel>();
}

这是InitialViewModel:

    private IEventAggregator eventAggregator;    

    public InitialViewModel(IEventAggregator ea) 
    {
      eventAggregator = ea;
    }

不幸的是,它抛出了NullReferenceException:

Caliburn.Micro.Platform.dll中出现"System.NullReferenceException"类型的异常,但未在用户代码中处理

我检查了CM的源代码并使用相同的代码来测试它:

  protected override void OnStartup(object sender, StartupEventArgs e)
    {
      var viewModel = IoC.GetInstance(typeof(InitialViewModel), null);
      var view = ViewLocator.LocateForModel(viewModel, null, null);
      ViewModelBinder.Bind(viewModel, view, null);

      var activator = viewModel as IActivate;
      if (activator != null)
        activator.Activate();

      DisplayRootViewFor<InitialViewModel>();
    }

奇怪的是,这些方面没有例外.这两种看法和视图模型具有一定的参考,并构造InitialView被调用,但是当它到达并调用DisplayRootViewFor,它仍然会抛出异常.

我应该改变什么？

Answer 1

我的容器缺少一个关键组件:

container.Singleton<IWindowManager, WindowManager>();