WIP dependency Injection

DaSaSo.Wpf/App.xaml.cs

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+using DaSaSo.Domain.Model;
+using DaSaSo.Domain.Services;
+using DaSaSo.EntityFramework;
+using DaSaSo.ViewModel;
+using Microsoft.Extensions.DependencyInjection;
+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace DaSaSo.Wpf
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+        protected override void OnStartup(StartupEventArgs e)
+        {
+            IServiceProvider serviceProvider = CreateServiceProvider();
+            base.OnStartup(e);
+            MainWindow? window = new MainWindow() { DataContext = new MainWindowViewModel() };
+            window.Show();
+        }
+
+        private IServiceProvider CreateServiceProvider()
+        {
+            IServiceCollection services = new ServiceCollection();
+
+            services.AddSingleton<DaSaSoDbContext>();
+            services.AddSingleton<IDataService<Client>, ClientDataService>():
+
+            return services.BuildServiceProvider();
+        }
+    }
+}