C# 单元测试Windows 8应用商店应用程序UI（Xaml控件）

我一直在创建一个Windows应用商店应用程序，但在测试一个创建网格的方法（这是一个XAML控件）时遇到了线程问题。 我尝试使用NUnit和MSTest进行测试

试验方法为：

[TestMethod]
public void CreateThumbnail_EmptyLayout_ReturnsEmptyGrid()
{
    Layout l = new Layout();
    ThumbnailCreator creator = new ThumbnailCreator();
    Grid grid = creator.CreateThumbnail(l, 192, 120);

    int count = grid.Children.Count;
    Assert.AreEqual(count, 0);
}  

和creator.create缩略图（引发错误的方法）：

当我运行此测试时，它抛出以下错误：

System.Exception: The application called an interface that was marshalled for a different thread. (Exception from HRESULT: 0x8001010E (RPC_E_WRONG_THREAD))

---

与控件相关的代码需要在UI线程上运行。尝试：

[TestMethod]
async public Task CreateThumbnail_EmptyLayout_ReturnsEmptyGrid()
{
    int count = 0;
    await ExecuteOnUIThread(() =>
    {
        Layout l = new Layout();
        ThumbnailCreator creator = new ThumbnailCreator();
        Grid grid = creator.CreateThumbnail(l, 192, 120);
        count = grid.Children.Count;
    });

    Assert.AreEqual(count, 0);
}

public static IAsyncAction ExecuteOnUIThread(Windows.UI.Core.DispatchedHandler action)
{
    return Windows.ApplicationModel.Core.CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, action);
}

---

以上内容应适用于MS测试。我不知道NUnit的情况。

非常感谢。它在MS测试中工作。在努尼特，它不起作用。

[TestMethod]
async public Task CreateThumbnail_EmptyLayout_ReturnsEmptyGrid()
{
    int count = 0;
    await ExecuteOnUIThread(() =>
    {
        Layout l = new Layout();
        ThumbnailCreator creator = new ThumbnailCreator();
        Grid grid = creator.CreateThumbnail(l, 192, 120);
        count = grid.Children.Count;
    });

    Assert.AreEqual(count, 0);
}

public static IAsyncAction ExecuteOnUIThread(Windows.UI.Core.DispatchedHandler action)
{
    return Windows.ApplicationModel.Core.CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, action);
}