public static IObservable <TResult> Timeout <T, TResult>(
this IObservable <T> source,
Duration period,
Func <TResult> timeoutValueFactory,
IScheduler scheduler = null)
{
return(Observable.Create <TResult>(o =>
{
scheduler = scheduler ?? Scheduler.Default;
IConnectableObservable <object> sourceObject = source.Select(x => (object)x).Publish();
var sourceComplete = new Subject <Unit>();
IDisposable completeSub = sourceObject
.Subscribe(_ => { }, o.OnError, () => sourceComplete.OnNext(Unit.Default));
IObservable <object> timer = Observable.Timer(period, scheduler).Select(_ => _timerObject);
IDisposable sub = sourceObject
.StartWith(_startObject)
.SelectMany(x => ReferenceEquals(x, _timerObject) ? Observable.Return(x) : timer.TakeUntil(sourceObject))
.TakeUntil(sourceComplete)
.Select(_ => timeoutValueFactory())
.Subscribe(o);
return new CompositeDisposable(sub, completeSub, sourceObject.Connect());
}));
}