如何从子视图的ViewModel中引发ViewModel中的事件

public class ChildViewModel
{
    public event EventHandler ChildEvent;

    public void OnChildEvent()
    {
        ChildEvent?.Invoke(this, EventArgs.Empty);
    }
}

public class ParentViewModel
{
    private ChildViewModel childViewModel;

    public ParentViewModel()
    {
        childViewModel = new ChildViewModel();
        childViewModel.ChildEvent += ChildViewModel_ChildEvent;
    }

    public void TriggerChildEvent()
    {
        childViewModel.OnChildEvent();
    }

    private void ChildViewModel_ChildEvent(object sender, EventArgs e)
    {
        // 在这里处理子视图ViewModel引发的事件
    }
}

public class ParentView
{
    private ParentViewModel parentViewModel;

    public ParentView()
    {
        parentViewModel = new ParentViewModel();
    }

    public void OnButtonClick()
    {
        parentViewModel.TriggerChildEvent();
    }
}