WIP - have working UI for base functions

LibreHardwareMonitor.Windows.WinUI/App.xaml.cs

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+// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
+// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+// Copyright (C) LibreHardwareMonitor and Contributors.
+
+using System;
+using System.IO;
+using System.Threading.Tasks;
+using Microsoft.UI.Xaml;
+using IOPath = System.IO.Path;
+
+namespace LibreHardwareMonitor.Windows.WinUI;
+
+public partial class App : Application
+{
+    private bool _launchStarted;
+    private Window? _window;
+
+    public App()
+    {
+        UnhandledException += App_UnhandledException;
+        AppDomain.CurrentDomain.UnhandledException += CurrentDomain_UnhandledException;
+        TaskScheduler.UnobservedTaskException += TaskScheduler_UnobservedTaskException;
+        InitializeComponent();
+    }
+
+    protected override void OnLaunched(LaunchActivatedEventArgs args)
+    {
+        LaunchMainWindow();
+    }
+
+    private void LaunchMainWindow()
+    {
+        if (_launchStarted)
+            return;
+
+        _launchStarted = true;
+        try
+        {
+            MainWindow mainWindow = new();
+            _window = mainWindow;
+            _window.Activate();
+            mainWindow.StartMonitoringAfterActivation();
+        }
+        catch (Exception ex)
+        {
+            WriteExceptionLog("Window launch failed", ex);
+            throw;
+        }
+    }
+
+    private static void App_UnhandledException(object sender, Microsoft.UI.Xaml.UnhandledExceptionEventArgs args)
+    {
+        WriteExceptionLog("WinUI unhandled exception", args.Exception);
+    }
+
+    private static void CurrentDomain_UnhandledException(object sender, System.UnhandledExceptionEventArgs args)
+    {
+        if (args.ExceptionObject is Exception exception)
+            WriteExceptionLog("AppDomain unhandled exception", exception);
+        else
+            WriteMessageLog($"AppDomain unhandled exception: {args.ExceptionObject}");
+    }
+
+    private static void TaskScheduler_UnobservedTaskException(object? sender, UnobservedTaskExceptionEventArgs args)
+    {
+        WriteExceptionLog("Unobserved task exception", args.Exception);
+    }
+
+    private static void WriteExceptionLog(string context, Exception exception)
+    {
+        WriteMessageLog($"{context}{Environment.NewLine}{exception}");
+    }
+
+    private static void WriteMessageLog(string message)
+    {
+        string logPath = IOPath.Combine(AppContext.BaseDirectory, "LibreHardwareMonitor.Windows.WinUI.startup.log");
+        File.AppendAllText(logPath, $"{DateTimeOffset.Now:u} {message}{Environment.NewLine}{Environment.NewLine}");
+    }
+}