Xamarin Forms Previewer设计时间数据

Question

我尝试设置设计数据，以便在Xamarin Forms Previewer中显示它们。我有一个DesignTimeViewModelLocator：

MessagingCenter.Send(this, "Invoke", "Invokedtrue");

MessagingCenter.Subscribe<MyPage, string>(this, "Invoke", async (sender, arg) =>
{
    await Process(arg);
});
MessagingCenter.Unsubscribe<MyPage>(this,"Invoke");


**ListPage**

    private void ViewCell_Tapped(object sender, EventArgs e)
    {
        try
        {
            MessagingCenter.Send(this, "Invoke", "Invokedtrue");
        }
        catch (Exception ex)
        {
            Debug.Write(ex);
        }
    }

**Detail Page**

    MessagingCenter.Subscribe<ListPage, string>(this, "Invoke", async (sender, arg) =>
    {
        await Process(arg);
    });

    private async Task Process(string arg)
    {
        //Here is api call to view detail of particular record

        //Here I unsubscribe the MessagingCenter.
        MessagingCenter.Unsubscribe<ListPage>(this,"Invoke");
    }

还有一个DesignTime视图模型：

public static class DesignTimeViewModelLocator
{
    static DesignTimeAboutViewModel aboutVm;

    public static DesignTimeAboutViewModel AboutVm => aboutVm ?? (aboutVm = new DesignTimeAboutViewModel());
}

在页面中：

public class DesignTimeAboutViewModel : IAboutViewModel
    {
        public DesignTimeAboutViewModel()
        {
            Resources = new LocalizedResources(typeof(Strings), CultureInfo.CurrentUICulture);
        }

        /// <inheritdoc />
        public LocalizedResources Resources { get; }
        public MvxAsyncCommand GoToWebsiteCommand { get; }
        public MvxAsyncCommand SendMailCommand { get; }
        public MvxCommand RateAppCommand { get; }
        public MvxAsyncCommand GoToRepositoryCommand { get; }
        public MvxAsyncCommand GoToTranslationProjectCommand { get; }
        public MvxAsyncCommand GoToDesignerTwitterAccountCommand { get; }
        public MvxAsyncCommand GoToContributionPageCommand { get; }
        public string Version { get; } = "0.4.5";
        public string Website { get; } = "www.foo.ch";
        public string SupportMail { get; } = "foo@me.ch";
    }

但是视图不会显示任何非静态的内容，例如运行应用程序时可以运行的版本：

我必须进行其他设置吗？

Answer 1

在进行一些重建并重新启动VS之后，结果大致符合预期：