public async Task<List<FeedItem>> Parse(FeedSource source)
 {
     var feed = await Task.Run(() => RssDeserializer.GetFeed(source.Url));
     var channel = feed?.GetRssChannels()?.FirstOrDefault();
     if (channel == null)
         return new List<FeedItem>();
     return (from rssItem in channel.GetRssItems()
             select new FeedItem
             {
                 Title = rssItem.Title,
                 Url = rssItem.Link,
                 ExternalItemId = rssItem.GetGuid(),
                 ImportTime = DateTime.UtcNow,
                 PublishTime = rssItem.Date,
                 FeedSource = source,
                 Summary = rssItem.Description,
             }).ToList();
 }
 public void AddFeedSource(FeedSource source)
 {
     feedSources.Add(source);
 }