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

Perhaps the following way will be useful to someone. You must use the "Do" method and the empty "Subscribe" method.

    listOfCommands.ToObservable()
    .Do(x =>
    {
        Debug.WriteLine("{0} of {1}", x.CurrentIndex, x.TotalCount);
    })
    .TakeWhile(c => c.CurrentIndex != c.TotalCount)
    .Subscribe();

This way you get the result without writing your own extensions.