RX Observable.TakeWhile checks condition BEFORE each element but I need to perform the check after

Question

Observable.TakeWhile allows you to run a sequence as long as a condition is true (using a delegate so we can perform computations on the actual sequence objects), but it\'s

Answer 1

Final edit:

I based my solution off of Sergey's TakeWhileInclusive implementation in this thread - How to complete a Rx Observable depending on a condition in a event

public static IObservable TakeUntil(
        this IObservable source, Func predicate)
{
    return Observable
        .Create(o => source.Subscribe(x =>
        {
            o.OnNext(x);
            if (predicate(x))
                o.OnCompleted();
        },
        o.OnError,
        o.OnCompleted
    ));
}