initial commit

CSharp/Applications/AvaloniaLoggingDI/App.axaml.cs

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+using System;
+using System.Drawing;
+using System.Reflection;
+using System.Threading;
+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Data.Core;
+using Avalonia.Data.Core.Plugins;
+using Avalonia.Markup.Xaml;
+using AvaloniaLoggingDI.ViewModels;
+using AvaloniaLoggingDI.Views;
+using LogViewer.Avalonia;
+using MessageBox.Avalonia;
+using MessageBox.Avalonia.Enums;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+using MsLogger.Core;
+using RandomLogging.Service;
+using Icon = MessageBox.Avalonia.Enums.Icon;
+
+namespace AvaloniaLoggingDI;
+
+public partial class App : Application
+{
+    public override void Initialize()
+        => AvaloniaXamlLoader.Load(this);
+
+    public override void OnFrameworkInitializationCompleted()
+    {
+        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            // Line below is needed to remove Avalonia data validation.
+            // Without this line you will get duplicate validations from both Avalonia and CT
+            ExpressionObserver.DataValidators.RemoveAll(x => x is DataAnnotationsValidationPlugin);
+
+            // catch all unhandled errors
+            AppDomain.CurrentDomain.UnhandledException += OnUnhandledException;
+
+            HostApplicationBuilder builder = Host.CreateApplicationBuilder();
+
+            builder
+                /*
+                 * Note: For information on launch profiles for debugging,
+                 *     see article: https://www.codeproject.com/Articles/5354478/NET-App-Settings-Demystified-Csharp-VB
+                 */
+
+                // Register the Random Logging Service
+                .AddRandomBackgroundService()
+
+                // visual debugging tools
+                .AddLogViewer()
+
+                // Microsoft Logger
+                //.Logging.AddDefaultDataStoreLogger();
+
+                // uncomment to use custom logging colors (note: System.Drawing namespace)
+                //
+                .Logging.AddDefaultDataStoreLogger(options =>
+                {
+                    options.Colors[LogLevel.Trace] = new()
+                    {
+                        Foreground = Color.White,
+                        Background = Color.DarkGray
+                    };
+
+                    options.Colors[LogLevel.Debug] = new()
+                    {
+                        Foreground = Color.White,
+                        Background = Color.Gray
+                    };
+
+                    options.Colors[LogLevel.Information] = new()
+                    {
+                        Foreground = Color.White,
+                        Background = Color.DodgerBlue
+                    };
+
+                    options.Colors[LogLevel.Warning] = new()
+                    {
+                        Foreground = Color.White,
+                        Background = Color.Orchid
+                    };
+                });
+
+            IServiceCollection services = builder.Services;
+
+            services
+                .AddSingleton<MainViewModel>()
+                .AddSingleton<MainWindow>(service => new MainWindow
+                {
+                    DataContext = service.GetRequiredService<MainViewModel>()
+                });
+
+            _host = builder.Build();
+            _cancellationTokenSource = new();
+            
+            try
+            {
+                LogStartingMode();
+
+                // set and show
+                desktop.MainWindow = _host.Services.GetRequiredService<MainWindow>();
+                desktop.ShutdownRequested += OnShutdownRequested;
+
+                // startup background services
+                _ = _host.StartAsync(_cancellationTokenSource.Token);
+            }
+            catch (OperationCanceledException)
+            {
+                // skip
+            }
+            catch (Exception ex)
+            {
+                ShowMessageBox("Unhandled Error", ex.Message);
+                return;
+            }
+        }
+
+        base.OnFrameworkInitializationCompleted();
+    }
+
+    private void OnShutdownRequested(object? sender, ShutdownRequestedEventArgs e)
+        => _ = _host!.StopAsync(_cancellationTokenSource!.Token);
+
+    #region Fields
+
+    private IHost? _host;
+    private CancellationTokenSource? _cancellationTokenSource;
+
+    #endregion
+
+    private void OnUnhandledException(object sender, UnhandledExceptionEventArgs e)
+        => ShowMessageBox("Unhandled Error", ((Exception)e.ExceptionObject).Message);
+
+    private void ShowMessageBox(string title, string message)
+    {
+        MessageBox.Avalonia.BaseWindows.Base.IMsBoxWindow<ButtonResult> messageBoxStandardWindow = MessageBoxManager
+            .GetMessageBoxStandardWindow(title, message, ButtonEnum.Ok, Icon.Stop);
+ 
+        messageBoxStandardWindow.Show();
+    }
+
+    private void LogStartingMode()
+    {
+        // Get the Launch mode
+        bool isDevelopment = string.Equals(Environment.GetEnvironmentVariable("DOTNET_MODIFIABLE_ASSEMBLIES"), "debug",
+            StringComparison.InvariantCultureIgnoreCase);
+
+        // initialize a logger & EventId
+        ILogger<App> logger = _host!.Services.GetRequiredService<ILogger<App>>();
+        EventId eventId = new EventId(id: 0, name: Assembly.GetEntryAssembly()!.GetName().Name);
+        
+        // log a test pattern for each log level
+        logger.TestPattern(eventId: eventId);
+
+        // log that we have started...
+        logger.Emit(eventId, LogLevel.Information, $"Running in {(isDevelopment ? "Debug" : "Release")} mode");
+    }
+}