Added .NET 5.0 and restructured the repository. (#47)

src/NotifyIconWpf.Sample.Windowless/App.xaml

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+<Application x:Class="NotifyIconWpf.Sample.Windowless.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             ShutdownMode="OnExplicitShutdown">
+    <Application.Resources>
+
+        <!--
+            Note that this application does not have a StartupUri declared, so no Window is automatically loaded.
+            Also, the ShutdownMode was set to explicit, so we have to close the application programmatically
+        -->
+        
+        
+        <!-- merge NotifyIcon and related stuff into the application -->
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <ResourceDictionary Source="NotifyIconResources.xaml" />
+            </ResourceDictionary.MergedDictionaries>
+        </ResourceDictionary>
+
+    </Application.Resources>
+</Application>

src/NotifyIconWpf.Sample.Windowless/App.xaml.cs

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+using System.Windows;
+using Hardcodet.Wpf.TaskbarNotification;
+
+namespace NotifyIconWpf.Sample.Windowless
+{
+    /// <summary>
+    /// Simple application. Check the XAML for comments.
+    /// </summary>
+    public partial class App : Application
+    {
+        private TaskbarIcon notifyIcon;
+
+        protected override void OnStartup(StartupEventArgs e)
+        {
+            base.OnStartup(e);
+
+            //create the notifyicon (it's a resource declared in NotifyIconResources.xaml
+            notifyIcon = (TaskbarIcon) FindResource("NotifyIcon");
+        }
+
+        protected override void OnExit(ExitEventArgs e)
+        {
+            notifyIcon.Dispose(); //the icon would clean up automatically, but this is cleaner
+            base.OnExit(e);
+        }
+    }
+}

src/NotifyIconWpf.Sample.Windowless/DelegateCommand.cs

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+using System;
+using System.Windows.Input;
+
+namespace NotifyIconWpf.Sample.Windowless
+{
+    /// <summary>
+    /// Simplistic delegate command for the demo.
+    /// </summary>
+    public class DelegateCommand : ICommand
+    {
+        public Action CommandAction { get; set; }
+        public Func<bool> CanExecuteFunc { get; set; }
+
+        public void Execute(object parameter)
+        {
+            CommandAction();
+        }
+
+        public bool CanExecute(object parameter)
+        {
+            return CanExecuteFunc == null  || CanExecuteFunc();
+        }
+
+        public event EventHandler CanExecuteChanged
+        {
+            add { CommandManager.RequerySuggested += value; }
+            remove { CommandManager.RequerySuggested -= value; }
+        }
+    }
+}

src/NotifyIconWpf.Sample.Windowless/MainWindow.xaml

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+<Window x:Class="NotifyIconWpf.Sample.Windowless.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        Title="MainWindow" Height="350" Width="525">
+    <Grid>
+        <TextBlock Text="Have a look at App.xaml and App.xaml.cs to see how things are working" />
+    </Grid>
+</Window>

src/NotifyIconWpf.Sample.Windowless/MainWindow.xaml.cs

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+using System.Windows;
+
+namespace NotifyIconWpf.Sample.Windowless
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+        }
+    }
+}

src/NotifyIconWpf.Sample.Windowless/NotifyIconResources.xaml

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+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+                    xmlns:tb="http://www.hardcodet.net/taskbar"
+                    xmlns:local="clr-namespace:NotifyIconWpf.Sample.Windowless">
+
+    <!-- The taskbar context menu - the first row is a dummy to show off simple data binding -->
+    <!--
+        The "shared" directive is needed if we reopen the sample window a few times - WPF will otherwise
+        reuse the same context menu (which is a resource) again (which will have its DataContext set to the old TaskbarIcon)
+  -->
+    <ContextMenu x:Shared="false" x:Key="SysTrayMenu">
+        <MenuItem Header="Show Window" Command="{Binding ShowWindowCommand}" />
+        <MenuItem Header="Hide Window" Command="{Binding HideWindowCommand}" />
+        <Separator />
+        <MenuItem Header="Exit" Command="{Binding ExitApplicationCommand}" />
+    </ContextMenu>
+
+
+    <!-- the application's NotifyIcon - started from App.xaml.cs. Declares its own view model. -->
+    <tb:TaskbarIcon x:Key="NotifyIcon"
+                    IconSource="/Red.ico"
+                    ToolTipText="Double-click for window, right-click for menu"
+                    DoubleClickCommand="{Binding ShowWindowCommand}"
+                    ContextMenu="{StaticResource SysTrayMenu}">
+
+        <!-- self-assign a data context (could also be done programmatically) -->
+        <tb:TaskbarIcon.DataContext>
+            <local:NotifyIconViewModel />
+        </tb:TaskbarIcon.DataContext>
+    </tb:TaskbarIcon>
+
+</ResourceDictionary>

src/NotifyIconWpf.Sample.Windowless/NotifyIconViewModel.cs

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+using System.Windows;
+using System.Windows.Input;
+
+namespace NotifyIconWpf.Sample.Windowless
+{
+    /// <summary>
+    /// Provides bindable properties and commands for the NotifyIcon. In this sample, the
+    /// view model is assigned to the NotifyIcon in XAML. Alternatively, the startup routing
+    /// in App.xaml.cs could have created this view model, and assigned it to the NotifyIcon.
+    /// </summary>
+    public class NotifyIconViewModel
+    {
+        /// <summary>
+        /// Shows a window, if none is already open.
+        /// </summary>
+        public ICommand ShowWindowCommand
+        {
+            get
+            {
+                return new DelegateCommand
+                {
+                    CanExecuteFunc = () => Application.Current.MainWindow == null,
+                    CommandAction = () =>
+                    {
+                        Application.Current.MainWindow = new MainWindow();
+                        Application.Current.MainWindow.Show();
+                    }
+                };
+            }
+        }
+
+        /// <summary>
+        /// Hides the main window. This command is only enabled if a window is open.
+        /// </summary>
+        public ICommand HideWindowCommand
+        {
+            get
+            {
+                return new DelegateCommand
+                {
+                    CommandAction = () => Application.Current.MainWindow.Close(),
+                    CanExecuteFunc = () => Application.Current.MainWindow != null
+                };
+            }
+        }
+
+
+        /// <summary>
+        /// Shuts down the application.
+        /// </summary>
+        public ICommand ExitApplicationCommand
+        {
+            get
+            {
+                return new DelegateCommand {CommandAction = () => Application.Current.Shutdown()};
+            }
+        }
+    }
+}

src/NotifyIconWpf.Sample.Windowless/NotifyIconWpf.Sample.Windowless.csproj

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+<Project Sdk="Microsoft.NET.Sdk.WindowsDesktop">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFrameworks>net45;net472;netcoreapp3.1;net5.0-windows</TargetFrameworks>
+    <GenerateResourceUsePreserializedResources>true</GenerateResourceUsePreserializedResources>
+	<ApplicationManifest>app.manifest</ApplicationManifest>
+  </PropertyGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\NotifyIconWpf\NotifyIconWpf.csproj" />
+  </ItemGroup>
+  <ItemGroup Condition="'$(TargetFramework)' != 'net45'">
+    <PackageReference Include="System.Resources.Extensions" Version="5.0.0" PrivateAssets="All"/>
+  </ItemGroup>
+
+  <ItemGroup Condition="$(TargetFramework.StartsWith('net4'))">
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="System.Xaml" />
+    <Reference Include="WindowsBase" />
+    <Reference Include="PresentationCore" />
+    <Reference Include="PresentationFramework" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile DependentUpon="%(Filename)" SubType="Code" Update="**\obj\**\*.g$(DefaultLanguageSourceExtension)" />
+    <Compile DependentUpon="%(Filename)" SubType="Designer" Update="**\*.xaml$(DefaultLanguageSourceExtension)" />
+  </ItemGroup>
+</Project>

src/NotifyIconWpf.Sample.Windowless/Properties/AssemblyInfo.cs

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+using System.Runtime.InteropServices;
+using System.Windows;
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+//In order to begin building localizable applications, set 
+//<UICulture>CultureYouAreCodingWith</UICulture> in your .csproj file
+//inside a <PropertyGroup>.  For example, if you are using US english
+//in your source files, set the <UICulture> to en-US.  Then uncomment
+//the NeutralResourceLanguage attribute below.  Update the "en-US" in
+//the line below to match the UICulture setting in the project file.
+
+//[assembly: NeutralResourcesLanguage("en-US", UltimateResourceFallbackLocation.Satellite)]
+
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
+    //(used if a resource is not found in the page, 
+    // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
+    //(used if a resource is not found in the page, 
+    // app, or any theme specific resource dictionaries)
+)]

src/NotifyIconWpf.Sample.Windowless/app.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+  <System.Windows.Forms.ApplicationConfigurationSection>
+    <add key="DpiAwareness" value="PerMonitorV2" />
+  </System.Windows.Forms.ApplicationConfigurationSection>
+</configuration>

src/NotifyIconWpf.Sample.Windowless/app.manifest

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+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0" xmlns:asmv2="urn:schemas-microsoft-com:asm.v2" xmlns:asmv3="urn:schemas-microsoft-com:asm.v3">
+  <!-- Make sure windows Vista and above treat Greenshot as "DPI Aware" See: http://msdn.microsoft.com/en-us/library/ms633543.aspx -->
+  <asmv3:application>
+    <asmv3:windowsSettings>
+      <dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">True/PM</dpiAware>
+      <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2,PerMonitor</dpiAwareness>
+      <longPathAware xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">true</longPathAware>
+      <gdiScaling xmlns="http://schemas.microsoft.com/SMI/2017/WindowsSettings">false</gdiScaling>
+    </asmv3:windowsSettings>
+  </asmv3:application>
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+      <!-- Windows 10 -->
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />
+      <maxversiontested Id="10.0.18363.0"/>
+      <!-- Windows 8.1 -->
+      <supportedOS Id="{1f676c76-80e1-4239-95bb-83d0f6d0da78}" />
+      <!--Windows 8 -->
+      <supportedOS Id="{4a2f28e3-53b9-4441-ba9c-d69d4a4a6e38}" />
+      <!-- Windows 7 -->
+      <supportedOS Id="{35138b9a-5d96-4fbd-8e2d-a2440225f93a}" />
+    </application>
+  </compatibility>
+  <!-- Set UAC level to "asInvoker" and disable registry virtualization -->
+  <asmv2:trustInfo>
+    <asmv2:security>
+      <asmv3:requestedPrivileges>
+        <!--
+          The presence of the "requestedExecutionLevel" node will disable
+          file and registry virtualization on Vista. See:
+          http://msdn.microsoft.com/en-us/library/aa965884%28v=vs.85%29.aspx
+
+          Use the "level" attribute to specify the User Account Control level:
+            asInvoker            = Never prompt for elevation
+            requireAdministrator = Always prompt for elevation
+            highestAvailable     = Prompt for elevation when started by administrator,
+                                   but do not prompt for administrator password when started by
+                                   standard user.
+        -->
+        <asmv3:requestedExecutionLevel level="asInvoker" />
+      </asmv3:requestedPrivileges>
+    </asmv2:security>
+  </asmv2:trustInfo>
+</assembly>