Question

I have a service that I would like to turn into a rx observable

The service has an interface of

    IEnumerable<Price> FetchUpdatedPrices()
    {
       //do work to return changed data since last update
    }

My idea was to use rx to allow a consumer to subscribe to updates. The implementation would poll the service every x seconds and call the observer.

I came up with the following

    public IDisposable Subscribe(IObserver<IEnumerable<Price>> observer)
    {

        IObservable<IEnumerable<Price>> updatedPrices = Observable.Interval(new TimeSpan(0, 0, 1))
            .Select(r => FetchUpdatedPrices());

        return updatedPrices.Subscribe(observer);
    }

The problem is I would like the observer to see an IObservable<Price> rather than an IObservable<IEnumerable<Price>>

Could anyone give this Rx noob any pointers on how to do this?

Answer 1

How about SelectMany?

IObservable<IEnumerable<Price>> updatedPrices = Observable.Interval(new TimeSpan(0, 0, 1))
    .SelectMany(r => FetchUpdatedPrices());