Add project files.

App.xaml

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+<Application
+    x:Class="PrintSample.App"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:PrintSample">
+    <Application.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" />
+                <!-- Other merged dictionaries here -->
+            </ResourceDictionary.MergedDictionaries>
+            <!-- Other app resources here -->
+        </ResourceDictionary>
+    </Application.Resources>
+</Application>

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 PrintSample
+{
+    /// <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;
+    }
+}

MainWindow.xaml

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+<Window
+    x:Class="PrintSample.MainWindow"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:PrintSample"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    mc:Ignorable="d">
+
+    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"
+          RowDefinitions =" Auto,*">
+        <Button HorizontalAlignment="Center" Click="PrintButtonClick">Print</Button>
+        <Rectangle x:Name="RectangleToPrint"
+               Grid.Row="1"
+               Width="500"
+               Height="500">
+            <Rectangle.Fill>
+                <ImageBrush ImageSource="Assets/AusterNY.jpg" />
+            </Rectangle.Fill>
+        </Rectangle>
+    </Grid>
+</Window>

MainWindow.xaml.cs

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+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using Microsoft.UI.Xaml.Printing;
+using System;
+using Windows.Graphics.Printing;
+
+namespace PrintSample
+{
+    public sealed partial class MainWindow : Window
+    {
+        private PrintManager printMan;
+        private PrintDocument printDoc;
+        private IPrintDocumentSource printDocSource;
+        public MainWindow()
+        {
+            this.InitializeComponent();
+            RegisterPrint();
+        }
+
+        #region Register for printing
+
+        void RegisterPrint()
+        {
+            // Register for PrintTaskRequested event
+            var hWnd = WinRT.Interop.WindowNative.GetWindowHandle(this);
+
+            printMan = PrintManagerInterop.GetForWindow(hWnd);
+            printMan.PrintTaskRequested += PrintTaskRequested;
+
+            // Build a PrintDocument and register for callbacks
+            printDoc = new PrintDocument();
+            printDocSource = printDoc.DocumentSource;
+            printDoc.Paginate += Paginate;
+            printDoc.GetPreviewPage += GetPreviewPage;
+            printDoc.AddPages += AddPages;
+        }
+
+        #endregion
+
+        #region Showing the print dialog
+
+        private async void PrintButtonClick(object sender, RoutedEventArgs e)
+        {
+            if (PrintManager.IsSupported())
+            {
+                try
+                {
+                    // Show print UI
+                    var hWnd = WinRT.Interop.WindowNative.GetWindowHandle(this);
+                    await PrintManagerInterop.ShowPrintUIForWindowAsync(hWnd);
+                }
+                catch
+                {
+                    // Printing cannot proceed at this time
+                    ContentDialog noPrintingDialog = new ContentDialog()
+                    {
+                        XamlRoot = (sender as Button).XamlRoot,
+                        Title = "Printing error",
+                        Content = "\nSorry, printing can' t proceed at this time.",
+                        PrimaryButtonText = "OK"
+                    };
+                    await noPrintingDialog.ShowAsync();
+                }
+            }
+            else
+            {
+                // Printing is not supported on this device
+                ContentDialog noPrintingDialog = new ContentDialog()
+                {
+                    XamlRoot = (sender as Button).XamlRoot,
+                    Title = "Printing not supported",
+                    Content = "\nSorry, printing is not supported on this device.",
+                    PrimaryButtonText = "OK"
+                };
+                await noPrintingDialog.ShowAsync();
+            }
+        }
+
+        private void PrintTaskRequested(PrintManager sender, PrintTaskRequestedEventArgs args)
+        {
+            // Create the PrintTask.
+            // Defines the title and delegate for PrintTaskSourceRequested
+            var printTask = args.Request.CreatePrintTask("Print", PrintTaskSourceRequrested);
+
+            // Handle PrintTask.Completed to catch failed print jobs
+            printTask.Completed += PrintTaskCompleted;
+        }
+
+        private void PrintTaskSourceRequrested(PrintTaskSourceRequestedArgs args)
+        {
+            // Set the document source.
+            args.SetSource(printDocSource);
+        }
+
+        #endregion
+
+        #region Print preview
+
+        private void Paginate(object sender, PaginateEventArgs e)
+        {
+            // As I only want to print one Rectangle, so I set the count to 1
+            printDoc.SetPreviewPageCount(1, PreviewPageCountType.Final);
+        }
+
+        private void GetPreviewPage(object sender, GetPreviewPageEventArgs e)
+        {
+            // Provide a UIElement as the print preview.
+            printDoc.SetPreviewPage(e.PageNumber, this.RectangleToPrint);
+        }
+
+        #endregion
+
+        #region Add pages to send to the printer
+
+        private void AddPages(object sender, AddPagesEventArgs e)
+        {
+            printDoc.AddPage(this.RectangleToPrint);
+
+            // Indicate that all of the print pages have been provided
+            printDoc.AddPagesComplete();
+        }
+
+        #endregion
+
+        #region Print task completed
+
+        private void PrintTaskCompleted(PrintTask sender, PrintTaskCompletedEventArgs args)
+        {
+            // Notify the user when the print operation fails.
+            if (args.Completion == PrintTaskCompletion.Failed)
+            {
+                this.DispatcherQueue.TryEnqueue(async () =>
+                {
+                    ContentDialog noPrintingDialog = new ContentDialog()
+                    {
+                        XamlRoot = this.Content.XamlRoot,
+                        Title = "Printing error",
+                        Content = "\nSorry, failed to print.",
+                        PrimaryButtonText = "OK"
+                    };
+                    await noPrintingDialog.ShowAsync();
+                });
+            }
+        }
+
+        #endregion
+    }
+}

Package.appxmanifest

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+<?xml version="1.0" encoding="utf-8"?>
+
+<Package
+  xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10"
+  xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10"
+  xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities"
+  IgnorableNamespaces="uap rescap">
+
+  <Identity
+    Name="25e13cae-9bce-442f-a8b9-473610c2ebc0"
+    Publisher="CN=migue"
+    Version="1.0.0.0" />
+
+  <Properties>
+    <DisplayName>PrintSample</DisplayName>
+    <PublisherDisplayName>migue</PublisherDisplayName>
+    <Logo>Assets\StoreLogo.png</Logo>
+  </Properties>
+
+  <Dependencies>
+    <TargetDeviceFamily Name="Windows.Universal" MinVersion="10.0.17763.0" MaxVersionTested="10.0.19041.0" />
+    <TargetDeviceFamily Name="Windows.Desktop" MinVersion="10.0.17763.0" MaxVersionTested="10.0.19041.0" />
+  </Dependencies>
+
+  <Resources>
+    <Resource Language="x-generate"/>
+  </Resources>
+
+  <Applications>
+    <Application Id="App"
+      Executable="$targetnametoken$.exe"
+      EntryPoint="$targetentrypoint$">
+      <uap:VisualElements
+        DisplayName="PrintSample"
+        Description="PrintSample"
+        BackgroundColor="transparent"
+        Square150x150Logo="Assets\Square150x150Logo.png"
+        Square44x44Logo="Assets\Square44x44Logo.png">
+        <uap:DefaultTile Wide310x150Logo="Assets\Wide310x150Logo.png" />
+        <uap:SplashScreen Image="Assets\SplashScreen.png" />
+      </uap:VisualElements>
+    </Application>
+  </Applications>
+
+  <Capabilities>
+    <rescap:Capability Name="runFullTrust" />
+  </Capabilities>
+</Package>

PrintSample.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net6.0-windows10.0.19041.0</TargetFramework>
+    <TargetPlatformMinVersion>10.0.17763.0</TargetPlatformMinVersion>
+    <RootNamespace>PrintSample</RootNamespace>
+    <ApplicationManifest>app.manifest</ApplicationManifest>
+    <Platforms>x86;x64;arm64</Platforms>
+    <RuntimeIdentifiers>win10-x86;win10-x64;win10-arm64</RuntimeIdentifiers>
+    <PublishProfile>win10-$(Platform).pubxml</PublishProfile>
+    <UseWinUI>true</UseWinUI>
+    <EnablePreviewMsixTooling>true</EnablePreviewMsixTooling>
+  </PropertyGroup>
+  <ItemGroup>
+    <None Remove="Assets\AusterNY.jpg" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Content Include="Assets\SplashScreen.scale-200.png" />
+    <Content Include="Assets\LockScreenLogo.scale-200.png" />
+    <Content Include="Assets\Square150x150Logo.scale-200.png" />
+    <Content Include="Assets\Square44x44Logo.scale-200.png" />
+    <Content Include="Assets\Square44x44Logo.targetsize-24_altform-unplated.png" />
+    <Content Include="Assets\StoreLogo.png" />
+    <Content Include="Assets\Wide310x150Logo.scale-200.png" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.WindowsAppSDK" Version="1.0.3" />
+    <PackageReference Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.22000.194" />
+    <Manifest Include="$(ApplicationManifest)" />
+  </ItemGroup>
+
+  <!-- Defining the "Msix" ProjectCapability here allows the Single-project MSIX Packaging
+       Tools extension to be activated for this project even if the Windows App SDK Nuget
+       package has not yet been restored -->
+  <ItemGroup Condition="'$(DisableMsixProjectCapabilityAddedByProject)'!='true' and '$(EnablePreviewMsixTooling)'=='true'">
+    <ProjectCapability Include="Msix" />
+  </ItemGroup>
+</Project>

PrintSample.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.3.32505.426
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PrintSample", "PrintSample.csproj", "{03182683-C013-4B6B-8CA2-86E37F0C92F6}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|arm64 = Debug|arm64
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|arm64 = Release|arm64
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{03182683-C013-4B6B-8CA2-86E37F0C92F6}.Debug|arm64.ActiveCfg = Debug|arm64
+		{03182683-C013-4B6B-8CA2-86E37F0C92F6}.Debug|arm64.Build.0 = Debug|arm64
+		{03182683-C013-4B6B-8CA2-86E37F0C92F6}.Debug|arm64.Deploy.0 = Debug|arm64
+		{03182683-C013-4B6B-8CA2-86E37F0C92F6}.Debug|x64.ActiveCfg = Debug|x64
+		{03182683-C013-4B6B-8CA2-86E37F0C92F6}.Debug|x64.Build.0 = Debug|x64
+		{03182683-C013-4B6B-8CA2-86E37F0C92F6}.Debug|x64.Deploy.0 = Debug|x64
+		{03182683-C013-4B6B-8CA2-86E37F0C92F6}.Debug|x86.ActiveCfg = Debug|x86
+		{03182683-C013-4B6B-8CA2-86E37F0C92F6}.Debug|x86.Build.0 = Debug|x86
+		{03182683-C013-4B6B-8CA2-86E37F0C92F6}.Debug|x86.Deploy.0 = Debug|x86
+		{03182683-C013-4B6B-8CA2-86E37F0C92F6}.Release|arm64.ActiveCfg = Release|arm64
+		{03182683-C013-4B6B-8CA2-86E37F0C92F6}.Release|arm64.Build.0 = Release|arm64
+		{03182683-C013-4B6B-8CA2-86E37F0C92F6}.Release|arm64.Deploy.0 = Release|arm64
+		{03182683-C013-4B6B-8CA2-86E37F0C92F6}.Release|x64.ActiveCfg = Release|x64
+		{03182683-C013-4B6B-8CA2-86E37F0C92F6}.Release|x64.Build.0 = Release|x64
+		{03182683-C013-4B6B-8CA2-86E37F0C92F6}.Release|x64.Deploy.0 = Release|x64
+		{03182683-C013-4B6B-8CA2-86E37F0C92F6}.Release|x86.ActiveCfg = Release|x86
+		{03182683-C013-4B6B-8CA2-86E37F0C92F6}.Release|x86.Build.0 = Release|x86
+		{03182683-C013-4B6B-8CA2-86E37F0C92F6}.Release|x86.Deploy.0 = Release|x86
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {34B2169B-5785-443A-BC66-A5676586D921}
+	EndGlobalSection
+EndGlobal

Properties/launchSettings.json

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+{
+  "profiles": {
+    "PrintSample (Package)": {
+      "commandName": "MsixPackage"
+    },
+    "PrintSample (Unpackaged)": {
+      "commandName": "Project"
+    }
+  }
+}