Question

Lets say I have this hot observable that publishes consecutive numbers every second for 5 minutes:

1, 2, … n, OnCompleted

At a certain point in time, after the hot observable has started, but before it has completed, I subscribe to it until it completes.

I get numbers: x, x+1, x+2, … n.

I want to convert the values I received to a cold observable.
Is there a special operator for this?

I know I could just use

Observable.Create(observer => hotObservable.Subscribe(onNext, onCompleted, onError);

But I’m sure there’s an Rx extension method I’m missing, that does just that

Answer 1

Just use Replay Subject.

ReplaySubject<int> sub = new ReplaySubject<int>();
hotObservable.Subscribe(sub);
//Now any one can subscribe to sub and it will get all items that hot observable sent to replay subject