Support UI selection via --wpf command-line argument

Refactored Program.cs to accept command-line arguments and select between WinForms (default) and WPF UI based on the presence of --wpf. Removed old commented-out UI selection code. Updated launchSettings.json to provide separate profiles for WinForms and WPF launches. If WPF is requested but unavailable, the app falls back to WinForms.

imagecatalog/Program.cs

@@ -57,7 +57,7 @@ static class Program
 
     public static IServiceProvider ServiceProvider { get; private set; }
     [STAThread]
-    static void Main()
+    static void Main(string[] args)
     {
         Application.SetHighDpiMode(HighDpiMode.SystemAware);
         Application.EnableVisualStyles();
@@ -74,21 +74,14 @@ static class Program
         // Resolve WPF MainWindow when available, otherwise fall back to WinForms MainForm
         var serviceProvider = ServiceProvider;
 
-        // NOTE: By default the app will attempt to run the WPF window when available and fall back
-        // to the WinForms MainForm. If you want to force the WinForms UI for testing, uncomment
-        // the block below and comment out the WPF branch.
-        // -----------------------------------------------------------------------------
-        // // Force WinForms UI (uncomment to enable)
-        //var mainForm = serviceProvider.GetRequiredService<MainForm>();
-        //// If you want to set the DataModel explicitly on the WinForms form use the lines below
-        //// var mainViewModel = serviceProvider.GetRequiredService<DataModel>();
-        //// mainForm.Model = mainViewModel;
-        //Application.Run(mainForm);
-        // -----------------------------------------------------------------------------
+        // Determine UI based on command line. Default: WinForms. Use --wpf to explicitly request WPF.
+        bool useWpf = args is not null && Array.Exists(args, a => string.Equals(a, "--wpf", StringComparison.OrdinalIgnoreCase));
 
-        // Create the WPF Application and merge MahApps resources BEFORE constructing the MainWindow
-        // so InitializeComponent sees the theme resources on first render.
-        var wpfApp = new System.Windows.Application();
+        if (useWpf)
+        {
+            // Create the WPF Application and merge MahApps resources BEFORE constructing the MainWindow
+            // so InitializeComponent sees the theme resources on first render.
+            var wpfApp = new System.Windows.Application();
             try
             {
                 wpfApp.Resources.MergedDictionaries.Add(new System.Windows.ResourceDictionary { Source = new Uri("pack://application:,,,/MahApps.Metro;component/Styles/Controls.xaml") });
@@ -111,15 +104,18 @@ static class Program
                 // If resources fail to load (package not present at runtime), continue silently
             }
 
-        // Now resolve the WPF MainWindow so its constructor runs with the application resources available
-        var wpfMain = serviceProvider.GetService(typeof(ImageCatalog_2.MainWindow)) as ImageCatalog_2.MainWindow;
-        if (wpfMain is not null)
-        {
-            wpfApp.Run(wpfMain);
-            return;
+            // Now resolve the WPF MainWindow so its constructor runs with the application resources available
+            var wpfMain = serviceProvider.GetService(typeof(ImageCatalog_2.MainWindow)) as ImageCatalog_2.MainWindow;
+            if (wpfMain is not null)
+            {
+                wpfApp.Run(wpfMain);
+                return;
+            }
+
+            // If WPF was requested but not available, fall back to WinForms.
         }
 
-        // Fallback to WinForms UI
+        // Default / fallback to WinForms UI
         var mainForm = serviceProvider.GetRequiredService<MainForm>();
         System.Windows.Forms.Application.Run(mainForm);
     }

imagecatalog/Properties/launchSettings.json

@@ -1,7 +1,12 @@
 {
   "profiles": {
-    "Profile 1": {
-      "commandName": "Project"
+    "ImageCatalog (WinForms)": {
+      "commandName": "Project",
+      "commandLineArgs": ""
+    },
+    "ImageCatalog (WPF)": {
+      "commandName": "Project",
+      "commandLineArgs": "--wpf"
     }
   }
-}
+}