c# - 如何在 Nunit 中调用 WPF Dispatcher？

Question

我想测试一个呈现带有数据字段值的文本 block 的应用程序。渲染完成后，我想获得实际宽度和实际高度。一切正常。当我尝试测试应用程序时，问题首先出现。我无法从测试项目调用调度程序。

代码如下。

this.Loaded += (s, e) =>
{
    TextBlock textBlock1 = new TextBlock();

    //// Text block value is assigned from data base field.
    textBlock1.Text = strValueFromDataBaseField;        
    //// Setting the wrap behavior.
    textBlock1.TextWrapping = TextWrapping.WrapWithOverflow;
    //// Adding the text block to the layout canvas.
    this.layoutCanvas.Children.Add(textBlock1);

    this.Dispatcher.BeginInvoke(DispatcherPriority.Background,
        (Action)(() =>
            {
                //// After rendering the text block with the data base field value. Measuring the actual width and height.
               this.TextBlockActualWidth = textBlock1.ActualWidth;
               this.TextBlockActualHeight = textBlock1.ActualHeight;

               //// Other calculations based on the actual widht and actual height.
            }
        ));
};

我刚刚开始使用 NUnit。所以，请帮助我。

谢谢

Answer 1

您可能想看看 http://www.codeproject.com/KB/WPF/UnitTestDispatcherTimer.aspx 它处理 WPF 和 NUnit 中的 DispatcherTimer，后者又使用 Dispatcher。

编辑

从链接尝试在测试前执行此操作:

Dispatcher.CurrentDispatcher.BeginInvoke(DispatcherPriority.Normal, testMethod);
// Start the worker thread's message pump
Dispatcher.Run();  // This will block until the dispatcher is shutdown

并在测试后停止。

Dispatcher disp = Dispatcher.CurrentDispatcher;
// Kill the worker thread's Dispatcher so that the
// message pump is shut down and the thread can die.
disp.BeginInvokeShutdown(DispatcherPriority.Normal);