SinglePage erweitert

DaSaSo.Wpf/Service/WindowService.cs

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+using DaSaSo.ViewModel.Interface;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace DaSaSo.Wpf.Service
+{
+    class WindowService
+    {
+        
+    }
+}