/// <summary>
/// Handles disposal and creation of old and new bindings
/// </summary>
private static void OnSelectedItemsChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
if (!(d is ListBox || d is MultiSelector))
{
throw new ArgumentException("The property 'SelectedItems' may only be set on ListBox or MultiSelector elements.");
}
if (e.OldValue != e.NewValue)
{
var oldBinding = GetSelectedItemBinding(d);
oldBinding?.UnBind();
var multiSelectorBinding = new MultiSelectorBinding((Selector)d, (IList)e.NewValue);
SetSelectedItemBinding(d, multiSelectorBinding);
multiSelectorBinding.Bind();
}
}
private static void SetSelectedItemBinding(DependencyObject element, MultiSelectorBinding value)
{
element.SetValue(SelectedItemBindingProperty, value);
}
