/// <summary>
/// Returns a rotating enumerator of ResourceDictionary objects that coordinates
/// with the dispenser object to ensure that no two enumerators are on the same
/// item. If the dispenser is reset or its collection is changed then the
/// enumerators are also reset.
/// </summary>
/// <param name="predicate">A predicate that returns a value indicating
/// whether to return an item.</param>
/// <returns>An enumerator of ResourceDictionaries.</returns>
public IEnumerator <ResourceDictionary> GetResourceDictionariesWhere(Func <ResourceDictionary, bool> predicate)
{
ResourceDictionaryEnumerator enumerator = new ResourceDictionaryEnumerator(this, predicate);
_ignoreResourceDictionaryDispensedByEnumerator = true;
try
{
foreach (ResourceDictionaryDispensedEventArgs args in _resourceDictionariesDispensed)
{
enumerator.ResourceDictionaryDispenserResourceDictionaryDispensed(this, args);
}
}
finally
{
_ignoreResourceDictionaryDispensedByEnumerator = false;
}
_resourceDictionaryEnumerators.Add(enumerator);
return(enumerator);
}
/// <summary>
/// Unregisters an enumerator so that it can be garbage collected.
/// </summary>
/// <param name="enumerator">The enumerator.</param>
internal void Unregister(ResourceDictionaryEnumerator enumerator)
{
_resourceDictionaryEnumerators.Remove(enumerator);
}