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DaSaSo.ViewModel/Commands/SelectProjectCommand.cs

@@ -1,6 +1,7 @@
 using DaSaSo.ViewModel.Interface;
 using System;
 using System.Collections.Generic;
+using System.ComponentModel;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
@@ -11,11 +12,22 @@ namespace DaSaSo.ViewModel.Commands
     {
         private readonly IActualProject _actualProject;
         private readonly ProjectListViewModel _projectListViewModel;
+        public override bool CanExecute(object? parameter)
+        {
+            return _projectListViewModel.SelectedProject != null;
+        }
 
         public SelectProjectCommand(IActualProject actualProject, ProjectListViewModel projectListViewModel)
         {
             _actualProject = actualProject;
             _projectListViewModel = projectListViewModel;
+            _projectListViewModel.PropertyChanged += _projectListViewModel_PropertyChanged;
+        }
+
+        private void _projectListViewModel_PropertyChanged(object? sender, PropertyChangedEventArgs e)
+        {
+            if (e.PropertyName == nameof(_projectListViewModel.CanSelectProject))
+                OnCanExecuteChanged();
         }
 
         public override async Task ExecuteAsync(object? parameter)