add proof of concept

POC/WpfApp1.sln

@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.7.34031.279
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WpfApp1", "WpfApp1\WpfApp1.csproj", "{5E84BEC0-370F-4F3E-8B59-E37EFD3E4438}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{5E84BEC0-370F-4F3E-8B59-E37EFD3E4438}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{5E84BEC0-370F-4F3E-8B59-E37EFD3E4438}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{5E84BEC0-370F-4F3E-8B59-E37EFD3E4438}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{5E84BEC0-370F-4F3E-8B59-E37EFD3E4438}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {C7CDF771-EEA9-421B-854E-7D1CC90BA16A}
+	EndGlobalSection
+EndGlobal

POC/WpfApp1/App.config

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+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.8" />
+    </startup>
+  <runtime>
+    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
+      <dependentAssembly>
+        <assemblyIdentity name="System.Runtime.CompilerServices.Unsafe" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0" />
+      </dependentAssembly>
+      <dependentAssembly>
+        <assemblyIdentity name="System.ComponentModel.Annotations" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-4.2.1.0" newVersion="4.2.1.0" />
+      </dependentAssembly>
+      <dependentAssembly>
+        <assemblyIdentity name="System.Buffers" publicKeyToken="cc7b13ffcd2ddd51" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-4.0.3.0" newVersion="4.0.3.0" />
+      </dependentAssembly>
+    </assemblyBinding>
+  </runtime>
+</configuration>

POC/WpfApp1/App.xaml

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+<Application
+    x:Class="WpfApp1.App"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="clr-namespace:WpfApp1"
+    StartupUri="MainWindow.xaml">
+    <Application.Resources>
+        <ResourceDictionary />
+    </Application.Resources>
+</Application>

POC/WpfApp1/App.xaml.cs

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+namespace WpfApp1
+{
+  /// <summary>
+  /// Interaction logic for App.xaml
+  /// </summary>
+  public partial class App
+  {
+  }
+}

POC/WpfApp1/DialogFrame.xaml

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+<UserControl
+    x:Class="WpfApp1.DialogFrame"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:local="clr-namespace:WpfApp1"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    d:DesignHeight="450"
+    d:DesignWidth="800"
+    Background="#34000000"
+    KeyDown="DialogFrame_OnKeyDown"
+    mc:Ignorable="d">
+    <Border
+        x:Name="DialogBorder"
+        Margin="60"
+        HorizontalAlignment="Center"
+        VerticalAlignment="Center"
+        Background="White"
+        BorderBrush="Black"
+        BorderThickness="1"
+        MouseMove="Border_OnMouseMove">
+        <Border.RenderTransform>
+            <TranslateTransform x:Name="BorderTransform" />
+        </Border.RenderTransform>
+        <Grid HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
+            <Grid.RowDefinitions>
+                <RowDefinition Height="Auto" />
+                <RowDefinition />
+            </Grid.RowDefinitions>
+            <Grid
+                Grid.Row="0"
+                Height="32"
+                Background="WhiteSmoke"
+                MouseDown="Border_OnMouseDown"
+                MouseUp="Border_OnMouseUp">
+                <Grid.ColumnDefinitions>
+                    <ColumnDefinition Width="*" />
+                    <ColumnDefinition Width="Auto" />
+                </Grid.ColumnDefinitions>
+                <TextBlock
+                    x:Name="TitleBlock"
+                    Grid.Column="0"
+                    Margin="10,0,0,0"
+                    VerticalAlignment="Center"
+                    FontSize="14" />
+                <Button
+                    Grid.Column="1"
+                    Padding="20,2"
+                    HorizontalAlignment="Right"
+                    VerticalContentAlignment="Center"
+                    Background="Transparent"
+                    BorderThickness="0"
+                    Click="CloseDialog_OnClick"
+                    FontFamily="Segoe UI Symbol"
+                    FontSize="12">
+                    ╳
+                </Button>
+            </Grid>
+            <ScrollViewer
+                Grid.Row="1"
+                HorizontalScrollBarVisibility="Auto"
+                VerticalScrollBarVisibility="Auto">
+                <StackPanel Margin="10" Orientation="Vertical">
+                    <TextBlock x:Name="MessageBlock" />
+                    <Button x:Name="NewDialog" Click="NewDialog_OnClick">New dialog</Button>
+                    <TextBlock x:Name="MouseStatus" FontSize="10" />
+                </StackPanel>
+            </ScrollViewer>
+        </Grid>
+    </Border>
+</UserControl>

POC/WpfApp1/DialogFrame.xaml.cs

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+using System.Windows.Controls;
+using System.Windows.Input;
+
+namespace WpfApp1
+{
+    using System.Windows;
+
+    /// <summary>
+    /// Interaction logic for DialogFrame.xaml
+    /// </summary>
+    public partial class DialogFrame
+    {
+        private Point? _mousePointOnClick;
+
+        public DialogFrame(string title, string message)
+        {
+            InitializeComponent();
+            this.TitleBlock.Text = title;
+            this.MessageBlock.Text = message;
+            SetMouseStatus();
+        }
+
+        private void CloseDialog_OnClick(object sender, RoutedEventArgs e)
+        {
+            DialogService.Instance.Remove(this);
+        }
+
+        private void NewDialog_OnClick(object sender, RoutedEventArgs e)
+        {
+            DialogService.Instance.Add(
+                new DialogFrame("Child", $"Child dialog {DialogService.Instance.Dialogs.Count}")
+            );
+        }
+
+        private void Border_OnMouseDown(object sender, MouseButtonEventArgs e)
+        {
+            var thisPosition = e.GetPosition(this);
+            _mousePointOnClick = new Point(
+                thisPosition.X - BorderTransform.X,
+                thisPosition.Y - BorderTransform.Y
+            );
+            SetMouseStatus();
+        }
+
+        private void Border_OnMouseMove(object sender, MouseEventArgs e)
+        {
+            if (e.LeftButton == MouseButtonState.Pressed && _mousePointOnClick is { } pointOnClick)
+            {
+                var pos = e.GetPosition(this);
+                BorderTransform.X = pos.X - pointOnClick.X;
+                BorderTransform.Y = pos.Y - pointOnClick.Y;
+            }
+            SetMouseStatus();
+        }
+
+        private void Border_OnMouseUp(object sender, MouseButtonEventArgs e)
+        {
+            _mousePointOnClick = null;
+            SetMouseStatus();
+        }
+
+        private void SetMouseStatus()
+        {
+            MouseStatus.Text =
+                $"""PointOnClick:"{(_mousePointOnClick?.ToString() ?? "<null>")}", BorderTransform:"{BorderTransform.X:F1}:{BorderTransform.Y:F1}" """;
+        }
+
+        private void DialogFrame_OnKeyDown(object sender, KeyEventArgs e)
+        {
+            if (e.Key == Key.Escape)
+            {
+                DialogService.Instance.Remove(this);
+            }
+        }
+    }
+}

POC/WpfApp1/DialogService.cs

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+namespace WpfApp1
+{
+    using System;
+    using System.Collections.ObjectModel;
+    using System.Windows.Controls;
+
+    public class DialogService
+    {
+        private static readonly Lazy<DialogService> LazyInstance = new(() => new DialogService());
+        private readonly ObservableCollection<UserControl> _dialogs = new();
+
+        public DialogService()
+        {
+            Dialogs = new ReadOnlyObservableCollection<UserControl>(_dialogs);
+        }
+
+        public static DialogService Instance => LazyInstance.Value;
+
+        public ReadOnlyObservableCollection<UserControl> Dialogs { get; }
+
+        public void Add(UserControl userControl)
+        {
+            _dialogs.Add(userControl);
+        }
+
+        public void Remove(UserControl userControl)
+        {
+            _dialogs.Remove(userControl);
+        }
+    }
+}

POC/WpfApp1/MainWindow.xaml

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+<Window
+    x:Class="WpfApp1.MainWindow"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:wpfApp1="clr-namespace:WpfApp1"
+    Title="MainWindow"
+    Width="800"
+    Height="450"
+    FontSize="24"
+    mc:Ignorable="d">
+    <Window.DataContext>
+        <wpfApp1:MainWindowViewModel />
+    </Window.DataContext>
+    <Grid>
+        <StackPanel HorizontalAlignment="Center" Orientation="Vertical">
+            <StackPanel.Style>
+                <Style TargetType="StackPanel">
+                    <Setter Property="IsEnabled" Value="False" />
+                    <Style.Triggers>
+                        <DataTrigger Binding="{Binding Dialogs.Count}" Value="0">
+                            <Setter Property="IsEnabled" Value="True" />
+                        </DataTrigger>
+                    </Style.Triggers>
+                </Style>
+            </StackPanel.Style>
+            <TextBlock Text="Hello, World" />
+            <Button Command="{Binding TestMultiStreamingCommand}" Content="This is a button" />
+            <Button Command="{Binding OpenDialogCommand}" Content="Open dialog" />
+        </StackPanel>
+        <ItemsControl ItemsSource="{Binding Dialogs}">
+            <ItemsControl.ItemsPanel>
+                <ItemsPanelTemplate>
+                    <Grid />
+                </ItemsPanelTemplate>
+            </ItemsControl.ItemsPanel>
+        </ItemsControl>
+    </Grid>
+</Window>

POC/WpfApp1/MainWindow.xaml.cs

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+namespace WpfApp1
+{
+  using System.Windows;
+
+  /// <summary>
+  /// Interaction logic for MainWindow.xaml
+  /// </summary>
+  public partial class MainWindow
+  {
+    public MainWindow()
+    {
+      InitializeComponent();
+    }
+
+    private void ButtonBase_OnClick(object sender, RoutedEventArgs e)
+    {
+      MessageBox.Show($"This is a message box. Sent by a {sender.GetType().Name}.", this.Title, MessageBoxButton.OK, MessageBoxImage.Information, MessageBoxResult.OK);
+    }
+  }
+}

POC/WpfApp1/MainWindowViewModel.cs

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+using System.IO;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace WpfApp1
+{
+    using System;
+    using System.Collections.ObjectModel;
+    using System.Linq;
+    using System.Windows.Controls;
+
+    using CommunityToolkit.Mvvm.ComponentModel;
+    using CommunityToolkit.Mvvm.Input;
+
+    public class MainWindowViewModel : ObservableObject
+    {
+        private RelayCommand _openDialogCommand;
+        private IRelayCommand _testMultiStreamingCommand;
+
+        public IRelayCommand OpenDialogCommand =>
+            _openDialogCommand ??= new RelayCommand(OpenDialog);
+
+        public ReadOnlyObservableCollection<UserControl> Dialogs => DialogService.Instance.Dialogs;
+
+        public IRelayCommand TestMultiStreamingCommand =>
+            _testMultiStreamingCommand ??= new AsyncRelayCommand(TestMultiStreaming);
+
+        private async Task TestMultiStreaming()
+        {
+            try
+            {
+                const string path = @"C:\Users\Holger\Desktop\WpfApp1.txt";
+                using var openFile1 = new FileStream(
+                    path,
+                    FileMode.Create,
+                    FileAccess.Write,
+                    FileShare.ReadWrite
+                );
+                using var writer1 = new StreamWriter(openFile1, Encoding.Unicode);
+                await writer1.WriteLineAsync($"{DateTime.Now:O} Hello from Writer 1");
+                await writer1.FlushAsync();
+                using var openFile2 = new FileStream(
+                    path,
+                    FileMode.Open,
+                    FileAccess.Read,
+                    FileShare.ReadWrite
+                );
+                using var reader = new StreamReader(openFile2, Encoding.Unicode);
+                var content = await reader.ReadToEndAsync();
+                MessageBox.Show(content);
+            }
+            catch (Exception e)
+            {
+                MessageBox.Show(e.Message);
+            }
+        }
+
+        private static void OpenDialog()
+        {
+            DialogService.Instance.Add(
+                new DialogFrame(
+                    "Main dialog",
+                    "Main dialog"
+                        + string.Join(
+                            Environment.NewLine,
+                            Enumerable.Repeat(Environment.OSVersion, 10)
+                        )
+                )
+            );
+        }
+    }
+}

POC/WpfApp1/Properties/AssemblyInfo.cs

@@ -0,0 +1,52 @@
+using System.Reflection;
+using System.Runtime.InteropServices;
+using System.Windows;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("WpfApp1")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("ise GmbH")]
+[assembly: AssemblyProduct("WpfApp1")]
+[assembly: AssemblyCopyright("Copyright © ise GmbH 2023")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// 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)
+)]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

POC/WpfApp1/Properties/Resources.Designer.cs

@@ -0,0 +1,71 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.42000
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace WpfApp1.Properties
+{
+
+
+  /// <summary>
+  ///   A strongly-typed resource class, for looking up localized strings, etc.
+  /// </summary>
+  // This class was auto-generated by the StronglyTypedResourceBuilder
+  // class via a tool like ResGen or Visual Studio.
+  // To add or remove a member, edit your .ResX file then rerun ResGen
+  // with the /str option, or rebuild your VS project.
+  [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "4.0.0.0")]
+  [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+  [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+  internal class Resources
+  {
+
+    private static global::System.Resources.ResourceManager resourceMan;
+
+    private static global::System.Globalization.CultureInfo resourceCulture;
+
+    [global::System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+    internal Resources()
+    {
+    }
+
+    /// <summary>
+    ///   Returns the cached ResourceManager instance used by this class.
+    /// </summary>
+    [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+    internal static global::System.Resources.ResourceManager ResourceManager
+    {
+      get
+      {
+        if ((resourceMan == null))
+        {
+          global::System.Resources.ResourceManager temp = new global::System.Resources.ResourceManager("WpfApp1.Properties.Resources", typeof(Resources).Assembly);
+          resourceMan = temp;
+        }
+        return resourceMan;
+      }
+    }
+
+    /// <summary>
+    ///   Overrides the current thread's CurrentUICulture property for all
+    ///   resource lookups using this strongly typed resource class.
+    /// </summary>
+    [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+    internal static global::System.Globalization.CultureInfo Culture
+    {
+      get
+      {
+        return resourceCulture;
+      }
+      set
+      {
+        resourceCulture = value;
+      }
+    }
+  }
+}

POC/WpfApp1/Properties/Resources.resx

@@ -0,0 +1,117 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+</root>

POC/WpfApp1/Properties/Settings.Designer.cs

@@ -0,0 +1,30 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.42000
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace WpfApp1.Properties
+{
+
+
+  [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+  [global::System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.VisualStudio.Editors.SettingsDesigner.SettingsSingleFileGenerator", "11.0.0.0")]
+  internal sealed partial class Settings : global::System.Configuration.ApplicationSettingsBase
+  {
+
+    private static Settings defaultInstance = ((Settings)(global::System.Configuration.ApplicationSettingsBase.Synchronized(new Settings())));
+
+    public static Settings Default
+    {
+      get
+      {
+        return defaultInstance;
+      }
+    }
+  }
+}

POC/WpfApp1/Properties/Settings.settings

@@ -0,0 +1,7 @@
+<?xml version='1.0' encoding='utf-8'?>
+<SettingsFile xmlns="uri:settings" CurrentProfile="(Default)">
+  <Profiles>
+    <Profile Name="(Default)" />
+  </Profiles>
+  <Settings />
+</SettingsFile>

POC/WpfApp1/WpfApp1.csproj

@@ -0,0 +1,118 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{5E84BEC0-370F-4F3E-8B59-E37EFD3E4438}</ProjectGuid>
+    <OutputType>WinExe</OutputType>
+    <RootNamespace>WpfApp1</RootNamespace>
+    <AssemblyName>WpfApp1</AssemblyName>
+    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <ProjectTypeGuids>{60dc8134-eba5-43b8-bcc9-bb4bc16c2548};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <WarningLevel>4</WarningLevel>
+    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
+    <Deterministic>true</Deterministic>
+    <NuGetPackageImportStamp>
+    </NuGetPackageImportStamp>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <LangVersion>latest</LangVersion>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <LangVersion>latest</LangVersion>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.ComponentModel.DataAnnotations" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Numerics" />
+    <Reference Include="System.Xml" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xaml">
+      <RequiredTargetFramework>4.0</RequiredTargetFramework>
+    </Reference>
+    <Reference Include="WindowsBase" />
+    <Reference Include="PresentationCore" />
+    <Reference Include="PresentationFramework" />
+  </ItemGroup>
+  <ItemGroup>
+    <ApplicationDefinition Include="App.xaml">
+      <Generator>MSBuild:Compile</Generator>
+      <SubType>Designer</SubType>
+    </ApplicationDefinition>
+    <Page Include="DialogFrame.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
+    <Page Include="MainWindow.xaml">
+      <Generator>MSBuild:Compile</Generator>
+      <SubType>Designer</SubType>
+    </Page>
+    <Compile Include="App.xaml.cs">
+      <DependentUpon>App.xaml</DependentUpon>
+      <SubType>Code</SubType>
+    </Compile>
+    <Compile Include="DialogFrame.xaml.cs">
+      <DependentUpon>DialogFrame.xaml</DependentUpon>
+    </Compile>
+    <Compile Include="DialogService.cs" />
+    <Compile Include="MainWindow.xaml.cs">
+      <DependentUpon>MainWindow.xaml</DependentUpon>
+      <SubType>Code</SubType>
+    </Compile>
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="MainWindowViewModel.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs">
+      <SubType>Code</SubType>
+    </Compile>
+    <Compile Include="Properties\Resources.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DesignTime>True</DesignTime>
+      <DependentUpon>Resources.resx</DependentUpon>
+    </Compile>
+    <Compile Include="Properties\Settings.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DependentUpon>Settings.settings</DependentUpon>
+      <DesignTimeSharedInput>True</DesignTimeSharedInput>
+    </Compile>
+    <EmbeddedResource Include="Properties\Resources.resx">
+      <Generator>ResXFileCodeGenerator</Generator>
+      <LastGenOutput>Resources.Designer.cs</LastGenOutput>
+    </EmbeddedResource>
+    <None Include="Properties\Settings.settings">
+      <Generator>SettingsSingleFileGenerator</Generator>
+      <LastGenOutput>Settings.Designer.cs</LastGenOutput>
+    </None>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="CommunityToolkit.Mvvm">
+      <Version>8.2.1</Version>
+    </PackageReference>
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>