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窗口(例如登录/选项等)？

这是我尝试过的(它显然曾经有过,但现在不再有了):

XAML:

<Application ...
    Startup="Application_Startup">

申请:

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.关闭时,Window1将按预期显示.但是当我关闭Window1时,应用程序根本没有关闭.

Answer 1

这是适合我的完整解决方案:

在App.xaml中,我删除了StartupUri东西,并添加了一个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,我按如下方式定义处理程序:

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);
        }
    }
}

Answer 2

好的道歉,这是解决方案:

我的原始问题几乎起作用,只需添加一件事,从Application XAML中删除StartupUri,然后将Show添加到主窗口.

那是:

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

上面,StartupUri已删除.

添加myMainWindow.Show():

public partial class App : Application
{

    private void Application_Startup(object sender, StartupEventArgs e)
    {
        Window1 myMainWindow = new Window1();
        DialogWindow myDialogWindow = new DialogWindow();
        myDialogWindow.ShowDialog();
        myMainWindow.Show();
    }

}

Answer 3

WPF 设置App.Current.MainWindow为打开的第一个窗口。如果您可以控制辅助窗口构造函数，只需在App.Current.MainWindow = Null那里设置。主窗口构建完成后，它将App.Current.MainWindow按预期分配给属性，无需任何干预。

public partial class TraceWindow : Window
{
    public TraceWindow()
    {
        InitializeComponent();
        if (App.Current.MainWindow == this)
        {
            App.Current.MainWindow = null;
        }
    }
}

如果您无权访问，您仍然可以MainWindow在主窗口的构造函数中进行设置。