public static IObservable <T> AsObservable <T>(this INotifyDisposable disposable, Func <T> lastValue = null)
{
return(Observable.Create <T>(observer =>
{
if (disposable.IsDisposed)
{
if (lastValue != null)
{
observer.OnNext(lastValue());
}
observer.OnCompleted();
return Disposables.Empty;
}
var handler = Disposables.Call(() =>
{
if (lastValue != null)
{
observer.OnNext(lastValue());
}
observer.OnCompleted();
});
disposable.Attach(handler, keepAlive: true);
return Disposables.Call(() =>
{
disposable.Dettach(handler);
});
}));
}
public void Dettach(IDisposable child) => _handler.Dettach(child);
