/// <summary>
/// Gets the associated with a specified object.
/// </summary>
/// <param name="obj">The object from which to retrieve the <see cref="T:System.Windows.Interactivity.BehaviorCollection" />.</param>
/// <returns>A <see cref="T:System.Windows.Interactivity.BehaviorCollection" /> containing the behaviors associated with the specified object.</returns>
public static BehaviorCollection GetBehaviors(DependencyObject obj)
{
BehaviorCollection behaviorCollection = (BehaviorCollection)obj.GetValue(Interaction.BehaviorsProperty);
if (behaviorCollection == null)
{
behaviorCollection = new BehaviorCollection();
obj.SetValue(Interaction.BehaviorsProperty, behaviorCollection);
}
return(behaviorCollection);
}
/// <exception cref="T:System.InvalidOperationException">Cannot host the same BehaviorCollection on more than one object at a time.</exception>
private static void OnBehaviorsChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
{
BehaviorCollection behaviorCollection = (BehaviorCollection)args.OldValue;
BehaviorCollection behaviorCollection2 = (BehaviorCollection)args.NewValue;
if (behaviorCollection != behaviorCollection2)
{
if (behaviorCollection != null && ((IAttachedObject)behaviorCollection).AssociatedObject != null)
{
behaviorCollection.Detach();
}
if (behaviorCollection2 != null && obj != null)
{
if (((IAttachedObject)behaviorCollection2).AssociatedObject != null)
{
throw new InvalidOperationException("Cannot set the same BehaviorCollection on multiple objects.");
}
behaviorCollection2.Attach(obj);
}
}
}
