Write an Rx “RetryAfter” extension method

Question

In the book IntroToRx the author suggest to write a \"smart\" retry for I/O which retry an I/O request, like a network request, after a period of time.

Here is the e

Answer 1

Here's the one I'm using:

public static IObservable DelayedRetry(this IObservable src, TimeSpan delay)
{
    Contract.Requires(src != null);
    Contract.Ensures(Contract.Result>() != null);

    if (delay == TimeSpan.Zero) return src.Retry();
    return src.Catch(Observable.Timer(delay).SelectMany(x => src).Retry());
}