public void Clear()
{
// raise the BeforeChanged event
var args = new BeforeChangedEventArgs();
BeforeChanged?.Invoke(this, args);
if (args.Cancel)
{
return;
}
_currentSelection.Clear();
Changed?.Invoke(this, EventArgs.Empty);
}
public void Replace(IEnumerable <IEntity> newSelection)
{
if (newSelection == null)
{
throw new ArgumentNullException(nameof(newSelection));
}
// raise the BeforeChanged event
var args = new BeforeChangedEventArgs();
BeforeChanged?.Invoke(this, args);
if (args.Cancel)
{
return;
}
_currentSelection.Clear();
_currentSelection.AddRange(newSelection);
// notify listeners
Changed?.Invoke(this, EventArgs.Empty);
}
