Added WinUI Sample Application

SampleApps/WinUiApp/MainWindow.xaml.cs

@@ -0,0 +1,62 @@
+using MapControl;
+using MapControl.Caching;
+using Microsoft.UI.Xaml;
+using System;
+using System.Diagnostics;
+using System.IO;
+using System.Threading.Tasks;
+using ViewModel;
+
+namespace WinUiApp
+{
+    public sealed partial class MainWindow : Window
+    {
+        private readonly MapViewModel viewModel = new();
+
+        static MainWindow()
+        {
+            try
+            {
+                ImageLoader.HttpClient.DefaultRequestHeaders.Add("User-Agent", "XAML Map Control Test Application");
+
+                var appData = Path.Combine(
+                    Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData), "MapControl");
+
+                TileImageLoader.Cache = new ImageFileCache(Path.Combine(appData, "TileCache"));
+                BingMapsTileLayer.ApiKey = File.ReadAllText(Path.Combine(appData, "BingMapsApiKey.txt"))?.Trim();
+            }
+            catch (Exception ex)
+            {
+                Debug.WriteLine(ex.Message);
+            }
+        }
+
+        public MainWindow()
+        {
+            InitializeComponent();
+
+            Title = "XAML Map Control - WinUI Sample Application";
+
+            root.DataContext = viewModel;
+
+            if (TileImageLoader.Cache is ImageFileCache cache)
+            {
+                Activated += async (s, e) =>
+                {
+                    await Task.Delay(2000);
+                    await cache.Clean();
+                };
+            }
+        }
+
+        private void SeamarksChecked(object sender, RoutedEventArgs e)
+        {
+            map.Children.Insert(map.Children.IndexOf(graticule), viewModel.MapLayers.SeamarksLayer);
+        }
+
+        private void SeamarksUnchecked(object sender, RoutedEventArgs e)
+        {
+            map.Children.Remove(viewModel.MapLayers.SeamarksLayer);
+        }
+    }
+}