viewmodel ins wpf gepackt, build failed

DaSaSo.Wpf/ViewModel/ImpregnierungListViewModel.cs

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+using DaSaSo.Domain.Model;
+using DaSaSo.Domain.Services;
+using DaSaSo.Wpf.ViewModel.Commands;
+using DaSaSo.Wpf.ViewModel.Interface;
+using Microsoft.Toolkit.Mvvm.Input;
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Input;
+
+namespace DaSaSo.Wpf.ViewModel
+{
+    public class ImpregnierungListViewModel : BaseViewModel
+    {
+        public ObservableCollection<Impregnation> Impregnations { get; }
+        private readonly IDataService<Impregnation> _impregnationService;
+        private Impregnation? _selectedImpregnation = null;
+        public Impregnation? SelectedImpregnation
+        {
+            get => _selectedImpregnation;
+            set
+            {
+                if(_selectedImpregnation != value)
+                {
+                    _selectedImpregnation = value;
+                    OnPropertyChanged();
+                    OnPropertyChanged(nameof(CanSelectImpregnation));
+                }
+            }
+        }
+        public bool CanSelectImpregnation => SelectedImpregnation != null;
+        public ICommand EditImpregnationCommand { get; set; }
+        public ICommand AddImpregnationCommand { get; set; }
+        bool _isLoading;
+
+        public bool IsLoading {
+            get => _isLoading;
+            set
+            {
+                if(_isLoading != value)
+                {
+                    _isLoading = value;
+                    OnPropertyChanged();
+                }
+            }
+        }
+
+        public ImpregnierungListViewModel(IDataService<Impregnation> impregnationService,IActualProject actualProject, IRenavigator editRenavigator)
+        {
+            IsLoading = true;
+            Impregnations = new ObservableCollection<Impregnation>();
+            _impregnationService = impregnationService;
+            AddImpregnationCommand = new RelayCommand(() =>
+            {
+                Impregnation newImpregnation = new Impregnation()
+                {
+                    Number = "Neu bitte Editieren!"
+                };
+                SelectedImpregnation = newImpregnation;
+                Impregnations.Add(newImpregnation);
+                OnPropertyChanged("Impregnations");
+            });
+            
+            //AddImpregnationCommand = //new AddImpregnationCommand(_impregnationService, editRenavigator);
+            EditImpregnationCommand = new EditImpregnationCommand(_impregnationService, this,actualProject, editRenavigator);
+            LoadImpregnations();
+
+        }
+
+        private async void LoadImpregnations()
+        {
+            var impregList = await _impregnationService.GetAll();
+            InitCollection(Impregnations, impregList);
+            IsLoading = false;
+        }
+
+        private void InitCollection(ObservableCollection<Impregnation> target, IEnumerable<Impregnation> source)
+        {
+            target.Clear();
+            foreach (var i in source)
+                target.Add(i);
+        }
+    }
+}