/// <summary>
/// Update feeds
/// </summary>
/// <returns>Task</returns>
public async Task Update()
{
var client = new HttpClient();
Rss latest;
using (var reader = new StringReader(await client.GetStringAsync(Endpoint)))
{
var desirializer = new XmlSerializer(typeof(Rss));
latest = desirializer.Deserialize(reader) as Rss;
}
if (latest == null || latest.Channel.LastBuildDate.CompareTo(this.Feed.Channel.LastBuildDate) <= 0)
{
return;
}
// Merge old feed items and new feed items
var oldItems = (from f in this.Feed.Channel.Items
where !latest.Channel.Items.Any(l => l.Equals(f.Guid))
orderby f.PubDate descending
select f).ToList();
foreach (var old in oldItems)
{
latest.Channel.Items.Add(old);
}
this.Feed = latest;
}
/// <summary>
/// Constructor
/// </summary>
public NewsFeedService()
{
this.Feed = new Rss();
}
