protected override void DoUnsubscribeForValueChange(object target)
{
if (notifyValueChanged != null)
{
notifyValueChanged.UnregisterValueChangedCallback(OnValueChanged);
}
}
public static IObservable <ChangeEvent <T> > OnValueChange <T>(this INotifyValueChanged <T> source)
{
return(Observable.FromEvent <EventCallback <ChangeEvent <T> >, ChangeEvent <T> >(
h => new EventCallback <ChangeEvent <T> >(h),
h => source.RegisterValueChangedCallback(h),
h => source.UnregisterValueChangedCallback(h)));
}