使用Application.StartupUri和处理WPF中的Startup事件之间的区别？

I've developed a WPF application which uses an advanced 3rd party UserControl; the UserControl shows an interactive map. If I open the main window of the application by specifying StartupUri="MainWindow" in XAML, or if I start the application from code using app.Run(new MainWindow()), then everything works fine. However, if I instead handle the Application Startup event this way

我开发了一个使用高级第三方UserControl的WPF应用程序; UserControl显示交互式地图。如果我通过在XAML中指定StartupUri =“MainWindow”来打开应用程序的主窗口，或者如果我使用app.Run（new MainWindow（））从代码启动应用程序，那么一切正常。但是，如果我改为以这种方式处理Application Startup事件

private void Application_Startup(object sender, StartupEventArgs e)
{
    new MainWindow().Show();
}

then I get the following exception when I start interacting with the map:

然后当我开始与地图交互时，我得到以下异常：

Cannot use a DependencyObject that belongs to a different thread than its parent Freezable.

不能使用属于与其父Freezable不同的线程的DependencyObject。

Why might this happen - is there some difference in which thread does what between these different ways of starting the application? Here is a partial stack trace for the exception:

为什么会发生这种情况 - 哪种线程在启动应用程序的不同方式之间做了哪些不同？以下是异常的部分堆栈跟踪：

at System.Windows.Freezable.EnsureConsistentDispatchers(DependencyObject owner, DependencyObject child)
at System.Windows.Freezable.OnFreezablePropertyChanged(DependencyObject oldValue, DependencyObject newValue, DependencyProperty property)
at System.Windows.Media.RenderData.PropagateChangedHandler(EventHandler handler, Boolean adding)
at System.Windows.Media.DrawingVisual.RenderClose(IDrawingContent newContent)
at System.Windows.Media.RenderDataDrawingContext.DisposeCore()
at System.Windows.Media.DrawingContext.System.IDisposable.Dispose()
at some3rdPartyClass.BuildVisual(Brush fg, Brush bg)

1 个解决方案

#1

Assuming that the 3rd party (but obviously I can't test it) invoke a thread and that happens to be the UI one when the xaml is in the starturi ....

假设第三方（但显然我无法测试它）调用一个线程，当xaml在starturi时恰好是UI一个....

Try this

尝试这个

Application.Current.Dispatcher.Invoke(
    new Action(() => {
        //pls share what kind of arguments you're using...
        new MainWindow().Show();
    })
    );

#1