WPF. C #. How to find out which item is selected in ListBox if the list is stylized?

Create a property (type you yourself know) CurrentClient and bind it to the SelectedItem selection in the ListBox will be available through this property.

  /// <summary> /// Это коллекция для заполнения ListBox /// </summary> private ObservableCollection<Animal> _Animals; public ObservableCollection<Animal> Animals { get { return _Animals; } set { if (_Animals == value) return; _Animals = value; PropertyChanged(this, new PropertyChangedEventArgs(nameof(Animals))); } } /// <summary> /// Текущее выбранное животное в ListBox /// </summary> private Animal _CurrentAnimal; public Animal CurrentAnimal { get { return _CurrentAnimal; } set { if (_CurrentAnimal == value) return; _CurrentAnimal = value; PropertyChanged(this, new PropertyChangedEventArgs(nameof(CurrentAnimal))); } } 

In xaml

  <ListBox ItemsSource="{Binding Animals, Mode=TwoWay}" SelectedItem="{Binding CurrentAnimal}"/> 

It's simple. Here is a handler for your eventsetter:

 private void SelectClient(object sender, MouseEventArgs e) { var index = listboxFolder.Items.IndexOf(((ListBoxItem)sender).DataContext); MessageBox.Show(index.ToString()); } 

It will return the position of the element relative to the sheet itself. In principle, this is the same listboxFolder.SelectedIndex, but you can optimize it for yourself.

But since you need an id, use the following code:

 listboxFolder.SelectionChanged += (sender, e) => { var id = (listboxFolder.SelectedItem as [Ваш класс клиента]).id; MessageBox.Show(id.ToString()); }; 

And there is nothing to write extra code in the data model.