AsyncFunctions.RxTest.TestObservable C# (CSharp) Method

        public static object TestObservable(object valueToEcho, int seconds)
        {
            return ExcelAsyncUtil.Observe("TestObservable", new[] { valueToEcho, seconds }, () => {
                Func<IObservable<object>> observableSource = () => {
                    return ((Func<IObservable<Notification<object>>>)(() =>
                                               Observable.Interval(TimeSpan.FromSeconds(seconds))
                                               .Select(x => (object)(valueToEcho.ToString() + x.ToString()))
                                               .Materialize()))()
                        .Where(n => n.Kind != NotificationKind.OnCompleted)
                        .Select(v => v.HasValue ? v.Value : v.Exception);
                };

                return (IExcelObservable)new ExcelObservable<object>(observableSource());
            });
        }