Initial commit.

Shared.Wpf/BaseViewModel.cs

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+using System.Windows;
+
+namespace ClientApiPoC.Shared.Wpf {
+    public abstract class BaseViewModel : NotifyPropertyChangedBase {
+        protected async Task HandleErrorAsync(Exception ex) {
+            if (ex == null) return;
+            MessageBox.Show(ex.Message, "Fehler", MessageBoxButton.OK, MessageBoxImage.Error);
+            await Task.CompletedTask;
+        }
+    }
+}

Shared.Wpf/MvvmWindow.cs

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+using System.Windows;
+
+namespace ClientApiPoC.Shared.Wpf {
+    public abstract class MvvmWindow<TViewModel> : Window where TViewModel : BaseViewModel {
+        protected TViewModel ViewModel { get; }
+
+        public MvvmWindow(TViewModel viewModel) : base() {
+            if (viewModel == null) throw new ArgumentNullException(nameof(viewModel));
+            this.ViewModel = viewModel;
+            this.DataContext = this.ViewModel;
+        }
+    }
+}

Shared.Wpf/Shared.Wpf.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0-windows</TargetFramework>
+    <Nullable>enable</Nullable>
+    <UseWPF>true</UseWPF>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <RootNamespace>ClientApiPoC.Shared.Wpf</RootNamespace>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)'=='Debug'">
+    <DebugType>portable</DebugType>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)'=='Release'">
+    <DebugType>none</DebugType>
+  </PropertyGroup>
+  
+  <ItemGroup>
+    <ProjectReference Include="..\Shared\Shared.csproj" />
+  </ItemGroup>
+
+</Project>