WPF 在主窗口之前显示对话框

Question

如何在主窗口之前显示对话框窗口(例如登录/选项等)？

这是我尝试过的(显然是 has once worked ，但不再是了):

XAML:

<Application ...
    Startup="Application_Startup">

应用:

public partial class App : Application
{
    private void Application_Startup(object sender, StartupEventArgs e)
    {
        Window1 myMainWindow = new Window1();
        DialogWindow myDialogWindow = new DialogWindow();
        myDialogWindow.ShowDialog();
    }
}

结果:首先显示 myDialogWindow。当它关闭时，Window1 将按预期显示。但当我关闭 Window1 时，应用程序根本没有关闭。

Answer 1

这是对我有用的完整解决方案:

在App.xaml中，我删除了StartupUri内容，并添加了Startup处理程序:

<Application x:Class="MyNamespace.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             Startup="ApplicationStart">
</Application>

在App.xaml.cs中，我定义处理程序如下:

public partial class App
{
    private void ApplicationStart(object sender, StartupEventArgs e)
    {
        //Disable shutdown when the dialog closes
        Current.ShutdownMode = ShutdownMode.OnExplicitShutdown;

        var dialog = new DialogWindow();

        if (dialog.ShowDialog() == true)
        {
            var mainWindow = new MainWindow(dialog.Data);
            //Re-enable normal shutdown mode.
            Current.ShutdownMode = ShutdownMode.OnMainWindowClose;
            Current.MainWindow = mainWindow;
            mainWindow.Show();
        }
        else
        {
            MessageBox.Show("Unable to load data.", "Error", MessageBoxButton.OK);
            Current.Shutdown(-1);
        }
    }
}