CommTester/ParentAvalonia/MainWindow.axaml.cs

using Avalonia.Controls;
using Avalonia.Interactivity;

namespace ParentAvalonia;

public partial class MainWindow : Window
{
    private readonly MainViewModel _vm;

    public MainWindow()
    {
        InitializeComponent();
        _vm = new MainViewModel();
        DataContext = _vm;

        Closed += async (_, __) =>
        {
            try
            {
                await _vm.DisposeAsync();
            }
            catch { }
        };
    }

    private async void StartChildren_Click(object? sender, RoutedEventArgs e)
    {
        try
        {
            await _vm.StartChildrenAsync(count: 3);
        }
        catch (Exception ex)
        {
            await MessageBoxAsync(ex.Message);
        }
    }

    private async void PingSelected_Click(object? sender, RoutedEventArgs e)
    {
        try
        {
            await _vm.PingSelectedAsync();
        }
        catch (Exception ex)
        {
            await MessageBoxAsync(ex.Message);
        }
    }

    private async void StartWork_Click(object? sender, RoutedEventArgs e)
    {
        try
        {
            await _vm.StartWorkSelectedAsync();
        }
        catch (Exception ex)
        {
            await MessageBoxAsync(ex.Message);
        }
    }

    private async void CancelWork_Click(object? sender, RoutedEventArgs e)
    {
        try
        {
            await _vm.CancelWorkSelectedAsync();
        }
        catch (Exception ex)
        {
            await MessageBoxAsync(ex.Message);
        }
    }

    private async Task MessageBoxAsync(string message)
    {
        var dlg = new Window
        {
            Title = "Error",
            Width = 500,
            Height = 160,
            Content = new StackPanel
            {
                Margin = new Avalonia.Thickness(12),
                Spacing = 12,
                Children =
                {
                    new TextBlock { Text = message, TextWrapping = Avalonia.Media.TextWrapping.Wrap },
                    new Button
                    {
                        HorizontalAlignment = Avalonia.Layout.HorizontalAlignment.Right,
                        Content = "OK",
                        IsDefault = true,
                    },
                },
            },
        };

        if (dlg.Content is StackPanel sp && sp.Children.LastOrDefault() is Button ok)
        {
            ok.Click += (_, __) => dlg.Close();
        }

        await dlg.ShowDialog(this);
    }
}