public static BehaviorCollection GetBehaviors(DependencyObject obj)
{
BehaviorCollection behaviors = (BehaviorCollection)obj.GetValue(BehaviorsProperty);
if (behaviors == null)
{
behaviors = new BehaviorCollection();
obj.SetValue(BehaviorsProperty, behaviors);
}
return(behaviors);
}
private static void OnBehaviorsChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
{
BehaviorCollection oldValue = (BehaviorCollection)args.OldValue;
BehaviorCollection newValue = (BehaviorCollection)args.NewValue;
if (oldValue != newValue)
{
if ((oldValue != null) && (oldValue.AssociatedObject != null))
{
oldValue.Detach();
}
if ((newValue != null) && (obj != null))
{
if (newValue.AssociatedObject != null)
{
throw new InvalidOperationException(Properties.Resources.CannotHostBehaviorCollectionMultipleTimesExceptionMessage);
}
newValue.Attach(obj);
}
}
}
