C# - Enumwerte als ItemsSource

/// <summary>
/// Implements a setter for the <c>ItemsSource</c>-property 
/// Usage: <c><![CDATA[<ListBox enumSource:EnumSource.EnumType="my:EnumType"/>]]></c>
/// </summary>
public class EnumSource : DependencyObject
{
	public static readonly DependencyProperty EnumTypeProperty =
		DependencyProperty.RegisterAttached(
			"EnumType",
			typeof(Type),
			typeof(EnumSource),
			new UIPropertyMetadata(null, EnumTypeChanged));

	public static Type GetEnumType(DependencyObject obj) => (Type)obj.GetValue(EnumTypeProperty);

	public static void SetEnumType(DependencyObject obj, Type value) => obj.SetValue(EnumTypeProperty, value);

	private static void EnumTypeChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
	{
		var enumType = GetEnumType(sender);
		if (enumType != null && !enumType.IsEnum)
		{
			throw new ArgumentException($"{enumType} is not an enum type");
		}

		var itemsSource = sender.GetType().GetProperty("ItemsSource");
		if (itemsSource == null)
		{
			throw new InvalidOperationException($"{sender} has no ItemsSource property");
		}

		itemsSource.SetValue(
			sender,
			enumType == null ? null : Enum.GetValues(enumType),
			null);
	}
}