BasicAggregateOperators.Program.SumWithNulls C# (CSharp) Method

        private static void SumWithNulls()
        {
            Demo.DisplayHeader("The Sum operator - works on nullable types as well");

            var numbers = new Subject<int?>();
            numbers
                .Sum()
                .SubscribeConsole("SumWithNull");

            numbers.OnNext(1);
            numbers.OnNext(2);
            numbers.OnNext(null);
            numbers.OnNext(3);
            numbers.OnNext(null);
            numbers.OnNext(4);
            numbers.OnNext(5);
            numbers.OnCompleted();
        }