public ReadonlyObservableBag(ObservableConcurrentBag <T> originalCollection, Func <T, bool> predicate)
{
_originalCollection = originalCollection;
_predicate = predicate;
originalCollection.CollectionChanged += OriginalCollection_CollectionChanged;
}
public static ReadonlyObservableBag <T> Select <T>(this ObservableConcurrentBag <T> collection, Func <T, bool> predicate)
{
return(new ReadonlyObservableBag <T>(collection, predicate));
}