Start app without windows?

[MonkAlex]

I want create ask dialog and then do any action. Show\ShowDialog methods only asynchronic, no idea, how to do it and dont close app. Where "ShutdownMode" analog with "OnExplicitShutdown" value from WPF?

    static void Main(string[] args)
    {
      InitializeLogging();
      AppBuilder.Configure<App>()
          .UsePlatformDetect()
          .SetupWithoutStarting();

      var dialog = new SimpleDialog();
      // Cannot await, Main not async
      var dialogResult = await dialog.ShowDialog();
      ...
    }

[wieslawsoltes]

@MonkAlex Try this:

static void Main(string[] args)
{
    var app = new Application();
    AppBuilder.Configure(app)
        .UsePlatformDetect()
        .SetupWithoutStarting();

    var dialog = new SimpleDialog();
    dialog.Show();
    app.Run(dialog);
}

[MonkAlex]

@wieslawsoltes its work, but i want dialog with custom buttons, need return it from ShowDialog method.

[MonkAlex]

Work this realization, but normal this or not, no idea:

    public virtual IButton Show()
    {
      CancellationTokenSource source = new CancellationTokenSource();
      
      var dialog = new Window(this);
      dialog.Closed += (sender, args) => source.Cancel();
      dialog.Show();

      Dispatcher.UIThread.MainLoop(source.Token);
      return dialog.ResultButton;
    }

MainLoop code hard for me, don't know, can i use it or not.

[Gillibald]

I will introduce ShutdowmMode soon. That is next in my list.

[jkoritzinsky]

Has this been fixed by #1662?

[Gillibald]

ShutdownMode (ExitMode) is fully implemented so it should be fixed.

[MonkAlex]

I do on start

      BuildAvaloniaApp().SetExitMode(ExitMode.OnExplicitExit).SetupWithoutStarting();

Then try to create and show window (remove Dispatcher.UIThread.MainLoop(source.Token); after show):

      using (DialogTokenSource = new CancellationTokenSource())
      {
        var dialog = new DialogWindow(this);
        dialog.Closed += (sender, args) => CloseImpl();
        DialogTokenSource.Token.Register(() => Dispatcher.UIThread.InvokeAsync(() => dialog.Close()));
        dialog.Show();

        return dialog.ResultButton;
      }

And app closed.

How to do it? _

[Gillibald]

I need to see more of your starting sequence to be sure what is going on. In general you need the main loop to run anything. So altering that isn't a good idea. You can run the application without an main window.

[MonkAlex]

https://github.com/MonkAlex/CommonLibraries/tree/exitmode
Simple app, try to use exit mode in last commit.

[Gillibald]

Try to call https://github.com/AvaloniaUI/Avalonia/blob/master/src/Avalonia.Controls/Application.cs#L272 before you create any visual. Just create your own token source and pass in a token. You can the request a cancelation on your token source or call Exit on your Application.

We should allow passing null to Run(Window mainWindow) instead of this.

[MonkAlex]

In WPF i can just run app and do nothing. I think, OnExplicitExit must enable this behavior.

And, i can run MainLoop without ExitMode configuration, what it changed?

[Gillibald]

You don't run the Application anywhere. That wouldn't work with WPF either.