ActivityStreams.Persistence.StreamCrawler.MarkAsCrowled C# (CSharp) Метод

        void MarkAsCrowled(ActivityStream stream)
        {
            if (crawledStreams.ContainsKey(stream.StreamId))
            {
                if (crawledStreams[stream.StreamId] < stream.ExpiresAt)
                    crawledStreams[stream.StreamId] = stream.ExpiresAt;
            }
            else
                crawledStreams.Add(stream.StreamId, stream.ExpiresAt);
        }