public FeedItemViewModel(FeedItem feedItem)
 {
     this.feedItem = feedItem.ThrowIfNull();
     feedItemsFeed = new StaticFeedViewModel(this.feedItem.Feed);
 }
        private void ProcessFeed()
        {
            SyndicationFeed feedData;

            try
            {
                feedData = LoadFeedDataFromUrl(feed.Url);
            }
            catch (FeedDataLoadException ex)
            {
                InteractionService.ShowMessage(ex.Message);
                return;
            }

            feed.Title = string.IsNullOrEmpty(feedData.Title?.Text) ? feed.Url : feedData.Title.Text;
            DateTime feedLastUpdated = feedData.LastUpdatedTime.UtcDateTime;
            // SqlServerCe can't handle DateTime.MinValue, which is value given if LastUpdatedTime
            // is absent from feed.
            if (feedLastUpdated > DateTime.MinValue)
            {
                feed.LastUpdated = feedLastUpdated;
            }

            foreach (var feedDataItem in feedData.Items)
            {
                FeedItem newItem = new FeedItem();
                newItem.Title = feedDataItem.Title?.Text;
                newItem.Url = feedDataItem.Links?.First()?.GetAbsoluteUri().ToString();
                newItem.Summary = feedDataItem.Summary?.Text;
                newItem.Content = feedDataItem.Content?.ToString();
                DateTime itemPublishDate = feedDataItem.PublishDate.UtcDateTime;
                // SqlServerCe can't handle DateTime.MinValue, see above.
                if (itemPublishDate > DateTime.MinValue)
                {
                    newItem.PublishDate = itemPublishDate;
                }
                newItem.PopulateHtmlFields();
                feed.FeedItems.Add(newItem);
            }

            NotifyPropertyChanged("");
        }