Initial commit.

ApiClient/ApiClient.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net10.0-windows</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <UseWPF>true</UseWPF>
+    
+    <RootNamespace>ClientApiPoC.ApiClient</RootNamespace>
+
+    <PublishSingleFile>true</PublishSingleFile>
+    <SelfContained>true</SelfContained>
+    <IncludeNativeLibrariesForSelfExtract>true</IncludeNativeLibrariesForSelfExtract>
+    <RuntimeIdentifier>win-x64</RuntimeIdentifier>
+    <EnableCompressionInSingleFile>true</EnableCompressionInSingleFile>
+    <PublishTrimmed>false</PublishTrimmed>
+
+    <Company>Mike Schumann</Company>
+    <Copyright>Copyright © 2026 $(Company)</Copyright>
+    <AssemblyVersion>0.1.0</AssemblyVersion>
+    <FileVersion>$(AssemblyVersion)</FileVersion>
+    <NeutralLanguage>en-US</NeutralLanguage>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)'=='Debug'">
+    <DebugType>portable</DebugType>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)'=='Release'">
+    <DebugType>none</DebugType>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="CommunityToolkit.Mvvm" Version="8.4.0" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="10.0.5" />
+    <PackageReference Include="Microsoft.Extensions.Hosting" Version="10.0.5" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Shared.Wpf\Shared.Wpf.csproj" />
+    <ProjectReference Include="..\Shared\Shared.csproj" />
+  </ItemGroup>
+
+</Project>

ApiClient/App.xaml

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

ApiClient/App.xaml.cs

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+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using System.Windows;
+
+namespace ClientApiPoC.ApiClient {
+    public partial class App : Application {
+        private IHost _host;
+
+        public App() {
+            _host = Host.CreateDefaultBuilder().ConfigureServices(services => {
+                // ViewModels:
+                services.AddTransient<MainWindowViewModel>();
+                // Views:
+                services.AddSingleton<MainWindow>();
+            }).Build();
+        }
+
+        protected override async void OnStartup(StartupEventArgs e) {
+            await _host.StartAsync();
+
+            var window = _host.Services.GetRequiredService<MainWindow>();
+            window.Show();
+
+            base.OnStartup(e);
+        }
+
+        protected override async void OnExit(ExitEventArgs e) {
+            await _host.StopAsync();
+            _host.Dispose();
+            base.OnExit(e);
+        }
+    }
+}

ApiClient/AssemblyInfo.cs

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+using System.Windows;
+
+[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)
+)]

ApiClient/MainWindow.xaml

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+<wpf:MvvmWindow x:TypeArguments="local:MainWindowViewModel"
+                x:Class="ClientApiPoC.ApiClient.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:local="clr-namespace:ClientApiPoC.ApiClient"
+                xmlns:wpf="clr-namespace:ClientApiPoC.Shared.Wpf;assembly=Shared.Wpf"
+                mc:Ignorable="d"
+                Title="API-Client"
+                Width="512"
+                Height="384"
+                ResizeMode="CanMinimize">
+    <Grid RowDefinitions="AUTO, AUTO, *"
+          ColumnDefinitions="*, AUTO"
+          Margin="12">
+
+        <Grid Grid.Row="0"
+              Grid.Column="0"
+              RowDefinitions="AUTO, AUTO"
+              ColumnDefinitions="*">
+
+            <TextBlock Grid.Row="0"
+                       Grid.Column="0"
+                       Text="Base-URL:" />
+
+            <TextBox Grid.Row="1"
+                     Grid.Column="0"
+                     VerticalAlignment="Center"
+                     IsEnabled="{Binding ControlsEnabled}"
+                     Text="{Binding ApiServiceUrl}" />
+
+        </Grid>
+
+        <Button Grid.Row="0"
+                Grid.Column="1"
+                VerticalAlignment="Stretch"
+                Padding="5"
+                Margin="5, 0, 0, 0"
+                IsDefault="True"
+                Content="HTTP-GET"
+                IsEnabled="{Binding ControlsEnabled}"
+                Command="{Binding HttpGetButtonCommand}" />
+
+        <TextBlock Grid.Row="1"
+                   Grid.Column="0"
+                   Grid.ColumnSpan="2"
+                   Margin="0, 5, 0, 0"
+                   Text="Result:" />
+
+        <TextBox Grid.Row="2"
+                 Grid.Column="0"
+                 Grid.ColumnSpan="2"
+                 Padding="5"
+                 HorizontalScrollBarVisibility="Auto"
+                 VerticalScrollBarVisibility="Auto"
+                 IsReadOnly="True"
+                 FontFamily="Consolas"
+                 Text="{Binding RequestResultDataString, Mode=OneWay}" />
+
+    </Grid>
+</wpf:MvvmWindow>

ApiClient/MainWindow.xaml.cs

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+using ClientApiPoC.Shared.Wpf;
+using System.Windows;
+
+namespace ClientApiPoC.ApiClient {
+    public partial class MainWindow : MvvmWindow<MainWindowViewModel> {
+        public MainWindow(MainWindowViewModel viewModel) : base(viewModel) {
+            InitializeComponent();
+        }
+    }
+}

ApiClient/MainWindowViewModel.cs

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+using ClientApiPoC.Shared;
+using ClientApiPoC.Shared.Models;
+using ClientApiPoC.Shared.Wpf;
+using CommunityToolkit.Mvvm.Input;
+using System.Net.Http;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using System.Windows.Input;
+
+namespace ClientApiPoC.ApiClient {
+    public class MainWindowViewModel : BaseViewModel {
+        #region Properties
+        private string _apiServiceUrl = "http://localhost:5228/";
+        public string ApiServiceUrl {
+            get => _apiServiceUrl;
+            set {
+                _apiServiceUrl = value;
+                OnPropertyChanged(nameof(ApiServiceUrl));
+            }
+        }
+
+        private bool _isFetchingData = false;
+        public bool IsFetchingData {
+            get => _isFetchingData;
+            set {
+                _isFetchingData = value;
+                OnPropertyChanged(nameof(IsFetchingData));
+                OnPropertyChanged(nameof(ControlsEnabled));
+            }
+        }
+
+        public bool ControlsEnabled => !this.IsFetchingData;
+
+        private ExampleRequestResultModel? _requestResultData = null;
+        public ExampleRequestResultModel? RequestResultData {
+            get => _requestResultData;
+            set {
+                _requestResultData = value;
+                OnPropertyChanged(nameof(RequestResultData));
+                OnPropertyChanged(nameof(RequestResultDataString));
+            }
+        }
+
+        public string RequestResultDataString {
+            get {
+                if (this.RequestResultData == null) return "NULL";
+                var options = new JsonSerializerOptions() {
+                    IndentCharacter = ' ',
+                    IndentSize = 2,
+                    NewLine = "\n",
+                    WriteIndented = true
+                };
+                return JsonSerializer.Serialize(this.RequestResultData, options);
+            }
+        }
+        #endregion
+
+        #region Commands
+        public ICommand HttpGetButtonCommand { get; }
+        #endregion
+
+        public MainWindowViewModel() {
+            this.HttpGetButtonCommand = new AsyncRelayCommand(HttpGetButtonActionAsync);
+        }
+
+        private async Task HttpGetButtonActionAsync() {
+            if (this.IsFetchingData) return;
+            try {
+                this.IsFetchingData = true;
+                var url = this.ApiServiceUrl;
+                if (string.IsNullOrWhiteSpace(url)) throw new InvalidOperationException("No base url specified.");
+                while (url.EndsWith('/')) url = url[..^1];
+                url += Routes.EXAMPLE_REQUEST;
+                using (var httpClient = Tools.CreateHttpClient()) {
+                    var request = new HttpRequestMessage(HttpMethod.Get, url);
+                    var response = await httpClient.SendAsync(request);
+                    response.EnsureSuccessStatusCode();
+                    var responseString = await response.Content.ReadAsStringAsync();
+                    var options = new JsonSerializerOptions() {
+                        PropertyNameCaseInsensitive = true
+                    };
+                    var result = JsonSerializer.Deserialize<ExampleRequestResultModel>(responseString, options);
+                    this.RequestResultData = result;
+                }
+            } catch (Exception ex) {
+                await HandleErrorAsync(ex);
+            } finally {
+                this.IsFetchingData = false;
+            }
+        }
+    }
+}

ApiClient/Properties/PublishProfiles/FolderProfile.pubxml

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+<?xml version="1.0" encoding="utf-8"?>
+<!-- https://go.microsoft.com/fwlink/?LinkID=208121. -->
+<Project>
+  <PropertyGroup>
+    <Configuration>Release</Configuration>
+    <Platform>Any CPU</Platform>
+    <PublishDir>..\Publish\</PublishDir>
+    <PublishProtocol>FileSystem</PublishProtocol>
+    <_TargetId>Folder</_TargetId>
+    <TargetFramework>net10.0-windows</TargetFramework>
+    <RuntimeIdentifier>win-x64</RuntimeIdentifier>
+    <SelfContained>true</SelfContained>
+    <PublishReadyToRun>false</PublishReadyToRun>
+  </PropertyGroup>
+</Project>