Added WinUI Sample Application

SampleApps/WinUiApp/App.xaml

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+<Application
+    x:Class="WinUiApp.App"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:WinUiApp">
+    <Application.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" />
+            </ResourceDictionary.MergedDictionaries>
+        </ResourceDictionary>
+    </Application.Resources>
+</Application>

SampleApps/WinUiApp/App.xaml.cs

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+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using Microsoft.UI.Xaml.Controls.Primitives;
+using Microsoft.UI.Xaml.Data;
+using Microsoft.UI.Xaml.Input;
+using Microsoft.UI.Xaml.Media;
+using Microsoft.UI.Xaml.Navigation;
+using Microsoft.UI.Xaml.Shapes;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices.WindowsRuntime;
+using Windows.ApplicationModel;
+using Windows.ApplicationModel.Activation;
+using Windows.Foundation;
+using Windows.Foundation.Collections;
+
+// To learn more about WinUI, the WinUI project structure,
+// and more about our project templates, see: http://aka.ms/winui-project-info.
+
+namespace WinUiApp
+{
+    /// <summary>
+    /// Provides application-specific behavior to supplement the default Application class.
+    /// </summary>
+    public partial class App : Application
+    {
+        /// <summary>
+        /// Initializes the singleton application object.  This is the first line of authored code
+        /// executed, and as such is the logical equivalent of main() or WinMain().
+        /// </summary>
+        public App()
+        {
+            this.InitializeComponent();
+        }
+
+        /// <summary>
+        /// Invoked when the application is launched normally by the end user.  Other entry points
+        /// will be used such as when the application is launched to open a specific file.
+        /// </summary>
+        /// <param name="args">Details about the launch request and process.</param>
+        protected override void OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs args)
+        {
+            m_window = new MainWindow();
+            m_window.Activate();
+        }
+
+        private Window m_window;
+    }
+}

SampleApps/WinUiApp/MainWindow.xaml

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+<Window
+    x:Class="WinUiApp.MainWindow"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:map="using:MapControl">
+
+    <Grid x:Name="root">
+        <Grid.RowDefinitions>
+            <RowDefinition/>
+            <RowDefinition Height="Auto"/>
+        </Grid.RowDefinitions>
+
+        <map:Map x:Name="map" ZoomLevel="11" MaxZoomLevel="21" MouseWheelZoomDelta="1"
+                 Center="{Binding MapCenter}"
+                 MapLayer="{Binding MapLayers.CurrentMapLayer}">
+
+            <map:MapGraticule x:Name="graticule" Opacity="0.6"
+                              Visibility="{Binding IsChecked, ElementName=graticuleCheckBox}"/>
+
+        </map:Map>
+
+        <Grid Grid.Row="1">
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition/>
+                <ColumnDefinition Width="Auto"/>
+            </Grid.ColumnDefinitions>
+
+            <StackPanel Grid.Column="1" Orientation="Horizontal" HorizontalAlignment="Right">
+                <CheckBox x:Name="graticuleCheckBox"
+                          VerticalAlignment="Center" Content="Graticule"/>
+
+                <CheckBox VerticalAlignment="Center" Content="Seamarks"
+                          Checked="SeamarksChecked" Unchecked="SeamarksUnchecked"/>
+
+                <ComboBox Width="250" VerticalAlignment="Center" Margin="5"
+                          ItemsSource="{Binding MapLayers.MapLayerNames}"
+                          SelectedItem="{Binding MapLayers.CurrentMapLayerName, Mode=TwoWay}"/>
+            </StackPanel>
+        </Grid>
+    </Grid>
+</Window>

SampleApps/WinUiApp/MainWindow.xaml.cs

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+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);
+        }
+    }
+}

SampleApps/WinUiApp/Properties/PublishProfiles/win10-x64.pubxml

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+<?xml version="1.0" encoding="utf-8"?>
+<!--
+https://go.microsoft.com/fwlink/?LinkID=208121.
+-->
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <PublishProtocol>FileSystem</PublishProtocol>
+    <Platform>x64</Platform>
+    <RuntimeIdentifier>win10-x64</RuntimeIdentifier>
+    <PublishDir>bin\$(Configuration)\$(TargetFramework)\$(RuntimeIdentifier)\publish\</PublishDir>
+    <SelfContained>true</SelfContained>
+    <PublishSingleFile>False</PublishSingleFile>
+    <PublishReadyToRun>True</PublishReadyToRun>
+   <!-- 
+    See https://github.com/microsoft/CsWinRT/issues/373
+    <PublishTrimmed>True</PublishTrimmed>
+    -->
+  </PropertyGroup>
+</Project>

SampleApps/WinUiApp/WinUiApp.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+    <PropertyGroup>
+        <OutputType>WinExe</OutputType>
+        <TargetFramework>net5.0-windows10.0.19041</TargetFramework>
+        <TargetPlatformMinVersion>10.0.17763.0</TargetPlatformMinVersion>
+        <RootNamespace>WinUiApp</RootNamespace>
+        <ApplicationManifest>app.manifest</ApplicationManifest>
+        <Platforms>x64</Platforms>
+        <RuntimeIdentifiers>win10-x64</RuntimeIdentifiers>
+        <UseWinUI>true</UseWinUI>
+        <Product>XAML Map Control</Product>
+        <Version>6.0.0</Version>
+        <Description>XAML Map Control WinUI Sample Application</Description>
+        <Authors>Clemens Fischer</Authors>
+        <Copyright>Copyright © 2021 Clemens Fischer</Copyright>
+        <AnalysisLevel>none</AnalysisLevel>
+    </PropertyGroup>
+    <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+        <DefineConstants>WINUI</DefineConstants>
+    </PropertyGroup>
+    <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+        <DefineConstants>WINUI</DefineConstants>
+    </PropertyGroup>
+    
+    <ItemGroup>
+        <Compile Include="..\Shared\MapLayers.cs" Link="MapLayers.cs" />
+        <Compile Include="..\Shared\MapViewModel.cs" Link="MapViewModel.cs" />
+    </ItemGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Microsoft.ProjectReunion" Version="0.8.0" />
+        <PackageReference Include="Microsoft.ProjectReunion.Foundation" Version="0.8.0" />
+        <PackageReference Include="Microsoft.ProjectReunion.WinUI" Version="0.8.0" />
+        <Manifest Include="$(ApplicationManifest)" />
+    </ItemGroup>
+
+    <ItemGroup>
+        <ProjectReference Include="..\..\MapControl\WinUI\MapControl.WinUI.csproj" />
+    </ItemGroup>
+</Project>

SampleApps/WinUiApp/WinUiApp.csproj.user

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <RunAnalyzersDuringLiveAnalysis>true</RunAnalyzersDuringLiveAnalysis>
+  </PropertyGroup>
+  <ItemGroup>
+    <None Update="App.xaml">
+      <SubType>Designer</SubType>
+    </None>
+    <None Update="MainWindow.xaml">
+      <SubType>Designer</SubType>
+    </None>
+  </ItemGroup>
+</Project>

SampleApps/WinUiApp/app.manifest

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+<?xml version="1.0" encoding="utf-8"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
+  <assemblyIdentity version="1.0.0.0" name="WinUiApp.app"/>
+
+  <application xmlns="urn:schemas-microsoft-com:asm.v3">
+    <windowsSettings>
+      <!-- The combination of below two tags have the following effect:
+           1) Per-Monitor for >= Windows 10 Anniversary Update
+           2) System < Windows 10 Anniversary Update
+      -->
+      <dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">true/PM</dpiAware>
+      <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2, PerMonitor</dpiAwareness>
+    </windowsSettings>
+  </application>
+</assembly>