调试时跳过行

Question

我有一个导航服务，该服务接收一个viewModel，使用相应的视图创建一个页面，并将该页面推入导航堆栈。在此方法的最后，将调用viewModel的“ InitializeAsync（...）”方法。

protected virtual async Task InternalNavigateToAsync(Type viewModelType, object parameter)
{
    var page = CreatePage(viewModelType, parameter);
    Debug.WriteLine("\n\n\n\n\n" + page.ToString() + "\n\n\n\n\n");
    if (page is MainView)
    {
        CurrentApplication.MainPage = page;
    }
    else if (CurrentApplication.MainPage is MainView)
    {
        var mainPage = CurrentApplication.MainPage as MainView;
        if (mainPage.Detail is ScoreboardNavigationPage navigationPage)
        {
            var currentPage = navigationPage.CurrentPage;
            if (currentPage.GetType() != page.GetType())
            {
                await navigationPage.PushAsync(page);
            }
        }
        else
        {
            navigationPage = new ScoreboardNavigationPage(page);
            mainPage.Detail = navigationPage;
        }

        mainPage.IsPresented = false;
    }
    else
    {
        var navigationPage = CurrentApplication.MainPage as ScoreboardNavigationPage;
        if (navigationPage != null)
        {
            await navigationPage.PushAsync(page);
        }
        else
        {
            CurrentApplication.MainPage = new ScoreboardNavigationPage(page);
        }
    }

    await (page.BindingContext as ViewModelBase).InitializeAsync(parameter);
}

首次使用MainViewModel调用此方法时，将执行Debug.Writeline(...)并且一切正常。然后，触发MainViewModel的InitializeAsync(...)方法，该方法通过HomeViewModel导航到HomeView：

public override async Task InitializeAsync(object data)
{
    await Task.WhenAll
    (
        _menuViewModel.InitializeAsync(data),
        _navigationService.NavigateToAsync<HomeViewModel>()
    );
}

但是，导航到HomeView时，我的Debug.WriteLine(...)永远不会触发！我尝试将断点放在Debug.WriteLine(...)的上方和下方，但执行似乎在

之前停了一行

var page = CreatePage(viewModelType, parameter);

这里是CreatePage（...）方法供参考：

protected Page CreatePage(Type viewModelType, object parameter)
{
    Type pageType = GetPageTypeForViewModel(viewModelType);

    if (pageType == null)
    {
        throw new Exception($"Mapping type for {viewModelType} is not a page");
    }

    Page page = Activator.CreateInstance(pageType) as Page;

    return page;
}