/// <summary>
/// Creates observable sequence from <paramref name="source"/> ListChanged events.
/// Observable will start with <see cref="NotifyListChangedAction.Reset"/> notification containing current snapshot of items.
/// </summary>
public static IObservable <NotifyListChangedEventArgs <T> > AsBehaviorObservable <T>(this INotifyListChanged <T> source)
{
return(Observable.Defer(() =>
{
var items = source.GetSnapshot();
return Observable.Return(new NotifyListChangedEventArgs <T>(NotifyListChangedAction.Reset, items, items));
})
.Concat(
source.AsObservable()
));
}
