MessageBox doesn't show.

[Wehrmachtserdbeere]

My MessageBox does not show when used. Since it seems to use Async, I even tried adding that and Task, but it does nothing but break literally everything, so do not even start talking about adding async. No error either.:

public void ShowExampleMessageBoxAsync()
{
    var box = MessageBoxManager.GetMessageBoxCustom(
        new MsBox.Avalonia.Dto.MessageBoxCustomParams
        {
            ButtonDefinitions =
            [
                new ButtonDefinition { Name = locMan.Get("Yes"), },
                new ButtonDefinition { Name = locMan.Get("No"), },
                new ButtonDefinition { Name = locMan.Get("Cancel"), }
            ],
            ContentTitle = locMan.Get("TestTitle"),
            ContentMessage = locMan.Get("TestString"),
            Icon = MsBox.Avalonia.Enums.Icon.Info,
            WindowStartupLocation = WindowStartupLocation.CenterOwner,
            CanResize = false,
            MaxWidth = 500,
            MaxHeight = 800,
            SizeToContent = SizeToContent.WidthAndHeight,
            ShowInCenter = true,
            Topmost = false,
            HyperLinkParams = new HyperLinkParams
            {
                Text = "https://docs.avaloniaui.net/",
                Action = new Action(() =>
                {
                    var desktop = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
                    var url = "https://docs.avaloniaui.net/";
                    if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
                    {
                        //https://stackoverflow.com/a/2796367/241446
                        using var proc = new Process { StartInfo = { UseShellExecute = true, FileName = url } };
                        proc.Start();

                        return;
                    }

                    if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
                    {
                        Process.Start("x-www-browser", url);
                        return;
                    }

                    if (!RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
                        throw new Exception("invalid url: " + url);
                    Process.Start("open", url);
                    return;
                })
            }
        }
        );

    var result = box.ShowAsync();
}

public void LoadFileClick(object? sender, RoutedEventArgs e)
{
    ShowExampleMessageBoxAsync();
}

[Wehrmachtserdbeere]

?

[thevortexcloud]

This looks like https://github.com/AvaloniaCommunity/MessageBox.Avalonia which is not an official Avaloinia package.

But your event handler should be async and await the result. It's also possible the message box is actually appearing but is behind some other window.

If you also want to try this using MVVM (which I have had success with in the past), I wrote up some information about handling dialogues in MVVM here awhile back.

#13484 (reply in thread)