public static async Task<IList<Item>> UpdateFeedAsync(Feed feed, TimeSpan timeout) {
using (var downloader = new DownloadHelper(timeout))
using (var reader = await downloader.DownloadXmlAsync(feed.Url)) {
var factory = GetFeedFactory(reader);
if (factory != null) {
return factory.UpdateFeed(feed, reader);
}
return new Item[0];
}
}
protected override Feed CreateFeed(XmlReader reader, string url) {
var rssFeed = new RssFeed();
rssFeed.Load(reader);
var items = rssFeed.Channel.Items.OrderBy(i => GetPublishedDate(i)).Select(CreateFeedItem);
var feed = new Feed {
Title = rssFeed.Channel.Title,
Url = url,
SiteUrl = rssFeed.Channel.Link.ToString(),
Description = rssFeed.Channel.Description,
Items = new List<Item>(items)
};
var latest = items.LastOrDefault();
if (latest != null) {
feed.Updated = latest.Published;
}
return feed;
}
protected override Feed CreateFeed(XmlReader reader, string url) {
var atomFeed = new AtomFeed();
atomFeed.Load(reader);
var items = atomFeed.Entries.OrderBy(e => GetPublishedDate(e)).Select(CreateFeedItem);
var feed = new Feed {
Title = atomFeed.Title.Content,
Url = url,
SiteUrl = atomFeed.Links.Any() ? atomFeed.Links[0].ToString() : String.Empty,
Description = atomFeed.Subtitle == null ? String.Empty : atomFeed.Subtitle.Content,
Items = new List<Item>(items)
};
var latest = items.LastOrDefault();
if (latest != null) {
feed.Updated = latest.Published;
}
return feed;
}
protected override IList<Item> UpdateFeed(Feed feed, XmlReader reader) {
var rssFeed = new RssFeed();
rssFeed.Load(reader);
var items = (from i in rssFeed.Channel.Items
let date = GetPublishedDate(i)
orderby date
where date > feed.Updated
select CreateFeedItem(i)).ToList();
feed.Items.AddRange(items);
var latest = items.LastOrDefault();
if (latest != null) {
feed.Updated = latest.Published;
}
// OPML does not set full description so check for one when updating.
if (String.IsNullOrEmpty(feed.Description)) {
feed.Description = rssFeed.Channel.Description;
}
return items;
}
protected override IList<Item> UpdateFeed(Feed feed, XmlReader reader) {
var atomFeed = new AtomFeed();
atomFeed.Load(reader);
var items = (from e in atomFeed.Entries
let date = GetPublishedDate(e)
orderby date
where date > feed.Updated
select CreateFeedItem(e)).ToList();
feed.Items.AddRange(items);
var latest = items.LastOrDefault();
if (latest != null) {
feed.Updated = latest.Published;
}
// OPML does not set full description so check for one when updating.
if (String.IsNullOrEmpty(feed.Description) && atomFeed.Subtitle != null) {
feed.Description = atomFeed.Subtitle.Content;
}
return items;
}
protected abstract IList<Item> UpdateFeed(Feed feed, XmlReader reader);
public void LoadFeed() {
#if !DEBUG
try {
#endif
_feed = FeedFactory.DownloadFeed(Url, Settings.Default.DownloadTimeout);
Title = _feed.Title;
#if !DEBUG
}
catch (Exception ex) {
DialogHelper.ShowError("Load Feed Error", ex.Message);
}
#endif
}
public void Add() {
try {
if (_feed == null) {
_feed = FeedFactory.DownloadFeed(Url, Settings.Default.DownloadTimeout);
}
_feed.Title = Title;
_feed.Category = Category.Trim();
Action(_feed);
TryClose(true);
}
catch (Exception ex) {
DialogHelper.ShowError("Load Feed Error", ex.Message);
}
}
public static IEnumerable<Feed> LoadFeeds() {
var filename = GetFeedsPath();
if (!File.Exists(filename)) {
yield break;
}
using (var stream = File.Open(filename, FileMode.Open, FileAccess.Read, FileShare.Read))
using (var reader = new BinaryReader(stream)) {
if (reader.ReadString() != SaveHeader) {
throw new InvalidOperationException("header");
}
if (reader.ReadInt32() != SaveVersion) {
throw new InvalidOperationException("version");
}
int feedCount = reader.ReadInt32();
for (int i = 0; i < feedCount; i++) {
var feed = new Feed {
Title = reader.ReadString(),
Url = reader.ReadString(),
SiteUrl = reader.ReadString(),
Description = reader.ReadString(),
Updated = DateTime.FromBinary(reader.ReadInt64()),
IsPreserved = reader.ReadBoolean(),
Category = reader.ReadString()
};
int itemCount = reader.ReadInt32();
feed.Items = new List<Item>(itemCount);
for (int j = 0; j < itemCount; j++) {
feed.Items.Add(new Item {
Title = reader.ReadString(),
Url = reader.ReadString(),
PodcastUrl = reader.ReadString(),
Published = DateTime.FromBinary(reader.ReadInt64()),
Summary = reader.ReadString(),
IsRead = reader.ReadBoolean()
});
}
yield return feed;
}
}
}