使用MEF的模板10依赖项注入 [英] Template 10 dependency injection using MEF

问题描述

我熟悉在.NET Framework 4.6.*中使用MEF，但在.NET Core中不熟悉.我正在弄混Template 10中的Hamburger模板，以查看它是否适合我的需求，但是我一直无法弄清楚如何使用MEF组合视图模型.

I'm familiar with using MEF in .NET Framework 4.6.* but not in .NET Core. I'm messing about with the Hamburger template from Template 10 to see if it is suitable for my needs but I haven't been able to figure out how to compose my view models using MEF.

我的问题是，如何使用导航服务以MEF注入其视图模型的方式导航至视图?

My question is how can I navigate to a view using the navigation service in such a way that its view model will be injected by MEF?

推荐答案

我不好，我没发现这个问题:

My bad, I hadn't spotted this:

如何将Unity IoC容器与Template10?

最后，我寻求了这样的解决方案:

In the end, I went for a solution like this:

public interface IView
{
    ViewModelBase ViewModel { get; }
}

[Export]
public sealed partial class MainPage : Page, IView
{
    public ViewModelBase ViewModel
    {
        get
        {
            return VM as ViewModelBase;
        }
    }

    [Import]
    public MainPageViewModel VM { get; set; }

    public MainPage()
    {
        InitializeComponent();
        NavigationCacheMode = Windows.UI.Xaml.Navigation.NavigationCacheMode.Enabled;
    }
}

在App.xaml.cs中:

And in the App.xaml.cs:

public override async Task OnStartAsync(StartKind startKind, IActivatedEventArgs args)
    {
        var config = new ContainerConfiguration();
        _container = config.WithAssembly(GetType().GetTypeInfo().Assembly).CreateContainer();
        await NavigationService.NavigateAsync(typeof(Views.MainPage));
    }       

    public override INavigable ResolveForPage(Page page, NavigationService navigationService)
    {
        _container.SatisfyImports(page);
        return (page as IView)?.ViewModel;
    }

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