Add logging functionality (especially for exceptions)

Virtual Display Driver Control/App.xaml.cs

@@ -1,4 +1,8 @@
 using Microsoft.UI.Xaml;
+using Serilog;
+using System;
+using System.Diagnostics;
+using System.Text;
 using Virtual_Display_Driver_Control.Common;
 using Virtual_Display_Driver_Control.Helpers;
 
@@ -11,6 +15,10 @@ public partial class App : Application {
 #pragma warning restore CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.
 
     public App() {
+        Logging.Initialize();
+
+        UnhandledException += App_UnhandledException;
+        AppDomain.CurrentDomain.UnhandledException += Domain_UnhandledException;
         InitializeComponent();
         Settings = SettingsProvider.Initialize();
     }
@@ -22,5 +30,56 @@ public partial class App : Application {
         MaterialHelper.Initialize();
 
         Window.Activate();
+        Window.Closed += OnClosed;
+    }
+
+    private void OnClosed(object sender, WindowEventArgs e) {
+        // cleanup ops
+        Log.CloseAndFlush();
+    }
+
+    void App_UnhandledException(object sender, Microsoft.UI.Xaml.UnhandledExceptionEventArgs e) {
+        _UnhandledException(sender, e.Exception);
+    }
+
+    void Domain_UnhandledException(object sender, System.UnhandledExceptionEventArgs e) {
+        _UnhandledException(sender, (Exception)e.ExceptionObject);
+    }
+
+    async void _UnhandledException(object sender, Exception ex) {
+        StringBuilder formattedException = new StringBuilder() { Capacity = 200 };
+
+        formattedException.Append("\n--------- UNHANDLED EXCEPTION ---------");
+
+        if (ex is not null) {
+            formattedException.Append($"\n>>>> HRESULT: {ex.HResult}\n");
+            if (ex.Message is not null) {
+                formattedException.Append("\n--- MESSAGE ---\n");
+                formattedException.Append(ex.Message);
+            }
+            if (ex.StackTrace is not null) {
+                formattedException.Append("\n--- STACKTRACE ---\n");
+                formattedException.Append(ex.StackTrace);
+            }
+            if (ex.Source is not null) {
+                formattedException.Append("\n--- SOURCE ---\n");
+                formattedException.Append(ex.Source);
+            }
+            if (ex.InnerException is not null) {
+                formattedException.Append("\n--- INNER ---\n");
+                formattedException.Append(ex.InnerException);
+            }
+        } else {
+            formattedException.Append("\nException is null!\n");
+        }
+
+        formattedException.Append("\n---------------------------------------\n");
+
+        Log.Fatal(formattedException.ToString());
+
+        Log.CloseAndFlush();
+
+        // Please check "Output Window" for exception details (View -> Output Window) (CTRL + ALT + O)
+        Debugger.Break();
     }
 }

Virtual Display Driver Control/Common/Logging.cs

@@ -0,0 +1,25 @@
+using Serilog;
+using System;
+using System.IO;
+
+namespace Virtual_Display_Driver_Control.Common; 
+class Logging {
+    public static void Initialize() {
+        var log = new LoggerConfiguration()
+            // Always log to debug regardless
+            .WriteTo.Debug();
+
+        // Write output log if not in debug mode
+        #if !DEBUG
+            log.WriteTo.File(Path.Combine(SettingsProvider.AppDir, "app.log"),
+                rollingInterval: RollingInterval.Day,
+                rollOnFileSizeLimit: true);
+        #endif
+            
+        Log.Logger = log.CreateLogger();
+    }
+
+    public static void Dispose() {
+        Log.CloseAndFlush();
+    }
+}

Virtual Display Driver Control/Virtual Display Driver Control.csproj

@@ -50,6 +50,9 @@
     <PackageReference Include="Microsoft.WindowsAppSDK" Version="1.4.231115000" />
     <PackageReference Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.22621.2428" />
     <PackageReference Include="Octokit" Version="9.0.0" />
+    <PackageReference Include="Serilog" Version="3.1.1" />
+    <PackageReference Include="Serilog.Sinks.Debug" Version="2.0.0" />
+    <PackageReference Include="Serilog.Sinks.File" Version="5.0.0" />
     <PackageReference Include="System.Drawing.Common" Version="8.0.0" />
     <PackageReference Include="GitVersion.MsBuild" Version="5.12.0">
       <PrivateAssets>all</PrivateAssets>