c# - MainWindow构造函数被调用两次

我正在尝试将DataContext的MainWindow设置为App.OnStartup中的ViewModel。我注意到这样做时，MainWindow()构造函数被调用了两次，我看到打开了2个窗口。知道是什么原因导致这种行为吗？我的代码如下:

public partial class App : Application
{
    protected override void OnStartup(StartupEventArgs e)
    {
        base.OnStartup(e);

        MainWindow mainWindow = new MainWindow();

        // Create the ViewModel to which the main window binds.
        MainWindowViewModel mainWindowViewModel = new MainWindowViewModel();

        // Register handle such that when the mainWindowViewModel asks to be closed, close the window.
        mainWindowViewModel.RequestClose += delegate(System.Object o, System.EventArgs eventArgs)
        {
            mainWindow.Close();
        };


        mainWindow.DataContext = mainWindowViewModel;

        mainWindow.Show();
    }
}

最佳答案

我怀疑StartupUri中仍然有 App.xaml 徘徊...