private static void OnComparerChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
CollectionSortBehavior behavior = (CollectionSortBehavior)d;
SortComparer oldComparer = (SortComparer)e.OldValue;
behavior.UnregisterComparer(oldComparer);
SortComparer newComparer = (SortComparer)e.NewValue;
behavior.RegisterComparer(newComparer);
behavior.SortItems();
}
private static void OnItemsSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
CollectionSortBehavior behavior = (CollectionSortBehavior)d;
IEnumerable oldSource = (IEnumerable)e.OldValue;
behavior.UnregisterItemsSource(oldSource);
IEnumerable newSource = (IEnumerable)e.NewValue;
behavior.RegisterItemsSource(newSource);
SortComparer comparer = behavior.Comparer;
if (comparer != null)
{
comparer.ItemsSource = newSource;
}
behavior.SortItems();
}