viewmodel ins wpf gepackt, build failed

DaSaSo.Wpf/ViewModel/Commands/SelectBuildingsiteCommand.cs

@@ -0,0 +1,39 @@
+using DaSaSo.Wpf.ViewModel.Interface;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.Wpf.ViewModel.Commands
+{
+    public class SelectBuildingsiteCommand : AsyncCommandBase
+    {
+        private IActualProject _actualProject;
+        private BuildingsiteListViewModel _buildingsiteListViewModel;
+        public override bool CanExecute(object? parameter)
+        {
+            return _buildingsiteListViewModel.CanSelectBuildingsite;
+        }
+
+        public SelectBuildingsiteCommand(IActualProject actualProject, BuildingsiteListViewModel buildingsiteListViewModel)
+        {
+            this._actualProject = actualProject;
+            this._buildingsiteListViewModel = buildingsiteListViewModel;
+            _buildingsiteListViewModel.PropertyChanged += _buildingsiteListViewModel_PropertyChanged;
+        }
+
+        private void _buildingsiteListViewModel_PropertyChanged(object? sender, PropertyChangedEventArgs e)
+        {
+            if (e.PropertyName == nameof(_buildingsiteListViewModel.CanSelectBuildingsite))
+                OnCanExecuteChanged();
+        }
+
+        public override async Task ExecuteAsync(object? parameter)
+        {
+            var s = _buildingsiteListViewModel.SelectedBuildingsite;
+            _actualProject.SetBuildingSite(s);
+        }
+    }
+}