WPF MVVM: Listview checkbox header for selecting/unselecting all the listview items

Question

I am trying to select/unselect all the listview items when checkbox in listview header is clicked.

View (xaml):

Answer 1

Your class DataModel must implement INotifyPropertyChanged, and fire the PropertyChanged event when the IsSelected property changes. Otherwise, the Binding of the ListViewItem's IsSelected property isn't notified.

public class DataModel : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    private bool isSelected;
    public bool IsSelected
    {
        get { return isSelected; }
        set
        {
            isSelected = value;
            PropertyChanged?.Invoke(this,
                new PropertyChangedEventArgs(nameof(IsSelected)));
        }
    }

    public string ID { get; set; }
    public string Desc { get; set; }
}