private void SubscribeToReaderEvents(IMonitorFactory monitorFactory, IReadOnlyCollection <string> readerNames)
{
_subscription?.Dispose();
if (readerNames.Count <= 0)
{
return;
}
_subscription = monitorFactory
.CreateObservable(SCardScope.System, readerNames)
.Do(ev => EventHistory.AddOnScheduler(ev)) // Always add elements using the UI scheduler!
.Subscribe(
onNext: _ => { },
onError: OnError);
}