Aspectacular.AzureQueueMulticastRoute.ConvertInboundMessagesToOutbound C# (CSharp) Method

        private IEnumerable<Tuple<CloudQueueMessage, TimeSpan?>> ConvertInboundMessagesToOutbound(IEnumerable<CloudQueueMessage> inboundMessages)
        {
            foreach(CloudQueueMessage inboundMessage in inboundMessages)
            {
                if(inboundMessage.DequeueCount > 1)
                    this.LogWarning("Message {0} from queue \"{1}\" has been dequeued before {2} times.", inboundMessage.Id, this.SourceQueue.Queue.Name, inboundMessage.DequeueCount);

                TimeSpan? ttl = inboundMessage.ExpirationTime == null ? (TimeSpan?)null : inboundMessage.ExpirationTime.Value - DateTimeOffset.Now;
                CloudQueueMessage outboundMessage = new CloudQueueMessage(inboundMessage.AsBytes);

                yield return new Tuple<CloudQueueMessage, TimeSpan?>(outboundMessage, ttl);
            }
        }