public static async Task <SyndicationFeed> LoadAsync(XmlReader reader, Rss20FeedFormatter Rssformatter, Atom10FeedFormatter Atomformatter, CancellationToken ct)
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
XmlReaderWrapper wrappedReader = XmlReaderWrapper.CreateFromReader(reader);
Atom10FeedFormatter atomSerializer = Atomformatter;
if (atomSerializer.CanRead(wrappedReader))
{
await atomSerializer.ReadFromAsync(wrappedReader, new CancellationToken());
return(atomSerializer.Feed);
}
Rss20FeedFormatter rssSerializer = Rssformatter;
if (rssSerializer.CanRead(wrappedReader))
{
await rssSerializer.ReadFromAsync(wrappedReader, new CancellationToken());
return(rssSerializer.Feed);
}
throw new XmlException(string.Format(SR.UnknownFeedXml, wrappedReader.LocalName, wrappedReader.NamespaceURI));
}
public static IList<Feed> GetFeeds()
{
var urls = new[]
{
"http://www.simplyvinay.com/GetBlogRss.aspx", "http://www.bbc.co.uk/blogs/formula1/rss.xml",
"http://feeds.feedburner.com/AyendeRahien"
};
var list = new List<Feed>();
foreach (var url in urls)
{
using (var reader = new CustomXmlReader(url))
{
if (reader.ReadState == ReadState.Initial)
reader.MoveToContent();
var atom = new Atom10FeedFormatter();
if (atom.CanRead(reader))
{
atom.ReadFrom(reader);
list.AddRange(GenerateFeed(atom.Feed, true));
}
var rss = new Rss20FeedFormatter();
if (rss.CanRead(reader))
{
rss.ReadFrom(reader);
list.AddRange(GenerateFeed(rss.Feed, false));
}
}
}
return list;
}
/// <summary>
/// Gets an RSS feed from a given URL and returns the resulting XML as a string.
/// </summary>
/// <param name="url">URL of the feed to load.</param>
/// <param name="count">The count of postings to return.</param>
/// <returns>The feed XML as a string.</returns>
public SyndicationFeed GetFeed(string url, int count)
{
XmlReaderSettings settings = new XmlReaderSettings();
settings.IgnoreWhitespace = true;
settings.CheckCharacters = true;
settings.CloseInput = true;
settings.IgnoreComments = true;
settings.IgnoreProcessingInstructions = true;
settings.ProhibitDtd = false;
using (XmlReader reader = XmlReader.Create(url, settings))
{
SyndicationFeedFormatter formatter = null;
Atom10FeedFormatter atom = new Atom10FeedFormatter();
Rss20FeedFormatter rss = new Rss20FeedFormatter();
SyndicationFeed feed;
// Determine the format of the feed
if (reader.ReadState == ReadState.Initial)
{
reader.MoveToContent();
}
if (atom.CanRead(reader))
{
formatter = atom;
}
if (rss.CanRead(reader))
{
formatter = rss;
}
if (formatter == null)
{
return null;
}
formatter.ReadFrom(reader);
feed = formatter.Feed;
// Remove unwanted items
List<SyndicationItem> items = new List<SyndicationItem>();
int added = 0;
foreach (SyndicationItem i in feed.Items)
{
items.Add(i);
if (added++ == count - 1) break;
}
feed.Items = items;
return feed;
}
}
public static async Task <TSyndicationFeed> LoadAsync <TSyndicationFeed>(XmlReader reader, CancellationToken ct) where TSyndicationFeed : SyndicationFeed, new()
{
Atom10FeedFormatter <TSyndicationFeed> atomSerializer = new Atom10FeedFormatter <TSyndicationFeed>();
if (atomSerializer.CanRead(reader))
{
await atomSerializer.ReadFromAsync(reader, ct).ConfigureAwait(false);
return(atomSerializer.Feed as TSyndicationFeed);
}
Rss20FeedFormatter <TSyndicationFeed> rssSerializer = new Rss20FeedFormatter <TSyndicationFeed>();
if (rssSerializer.CanRead(reader))
{
await rssSerializer.ReadFromAsync(reader, ct).ConfigureAwait(false);
return(rssSerializer.Feed as TSyndicationFeed);
}
throw new XmlException(SR.Format(SR.UnknownFeedXml, reader.LocalName, reader.NamespaceURI));
}
public static TSyndicationFeed Load <TSyndicationFeed>(XmlReader reader) where TSyndicationFeed : SyndicationFeed, new()
{
if (reader == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("reader");
}
Atom10FeedFormatter <TSyndicationFeed> formatter = new Atom10FeedFormatter <TSyndicationFeed>();
if (formatter.CanRead(reader))
{
formatter.ReadFrom(reader);
return(formatter.Feed as TSyndicationFeed);
}
Rss20FeedFormatter <TSyndicationFeed> formatter2 = new Rss20FeedFormatter <TSyndicationFeed>();
if (!formatter2.CanRead(reader))
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(System.ServiceModel.SR.GetString("UnknownFeedXml", new object[] { reader.LocalName, reader.NamespaceURI })));
}
formatter2.ReadFrom(reader);
return(formatter2.Feed as TSyndicationFeed);
}
public static TSyndicationFeed Load <TSyndicationFeed>(XmlReader reader)
where TSyndicationFeed : SyndicationFeed, new()
{
if (reader == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("reader");
}
Atom10FeedFormatter <TSyndicationFeed> atomSerializer = new Atom10FeedFormatter <TSyndicationFeed>();
if (atomSerializer.CanRead(reader))
{
atomSerializer.ReadFrom(reader);
return(atomSerializer.Feed as TSyndicationFeed);
}
Rss20FeedFormatter <TSyndicationFeed> rssSerializer = new Rss20FeedFormatter <TSyndicationFeed>();
if (rssSerializer.CanRead(reader))
{
rssSerializer.ReadFrom(reader);
return(rssSerializer.Feed as TSyndicationFeed);
}
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.Format(SR.UnknownFeedXml, reader.LocalName, reader.NamespaceURI)));
}
public void CanRead ()
{
Rss20FeedFormatter f = new Rss20FeedFormatter ();
Assert.IsTrue (f.CanRead (CreateReader ("<rss>")), "#1");
Assert.IsFalse (f.CanRead (CreateReader ("<item>")), "#2");
Assert.IsFalse (f.CanRead (CreateReader ("<rss xmlns='urn:foo'>")), "#3");
Assert.IsFalse (f.CanRead (CreateReader ("<feed xmlns='http://www.w3.org/2005/Atom'>")), "#4");
Assert.IsFalse (f.CanRead (CreateReader ("<hoge>")), "#5");
XmlReader r = CreateReader ("<rss></rss>");
r.Read (); // element
r.Read (); // endelement
Assert.IsFalse (f.CanRead (r), "#6");
r = CreateReader ("<rss><channel><title>test</title></channel></rss>");
r.Read (); // feed
r.Read (); // channel
Assert.IsFalse (f.CanRead (r), "#7");
}
/// <summary>
/// Returns a <c>SyndicationFeed</c> given a valid feed url;
/// otherwhise it returns null.
/// </summary>
/// <param name="feedUrl">
/// A string of the feed url.
/// </param>
/// <returns>
/// A <c>SyndicationFeed</c> that may be null.
/// </returns>
private static SyndicationFeed GetRssData(string feedUrl)
{
SyndicationFeed feed = null;
try
{
if (!string.IsNullOrEmpty(feedUrl))
{
XmlReaderSettings settings = new XmlReaderSettings();
settings.IgnoreWhitespace = true;
settings.CheckCharacters = true;
settings.CloseInput = true;
settings.IgnoreComments = true;
settings.IgnoreProcessingInstructions = true;
using (XmlReader reader = XmlReader.Create(feedUrl, settings))
{
SyndicationFeedFormatter GenericFeedFormatter = null;
Atom10FeedFormatter atom = new Atom10FeedFormatter();
Rss20FeedFormatter rss = new Rss20FeedFormatter();
if (reader.ReadState == ReadState.Initial)
{
reader.MoveToContent();
}
// Try either atom or rss reading.
if (atom.CanRead(reader))
{
GenericFeedFormatter = atom;
}
else if (rss.CanRead(reader))
{
GenericFeedFormatter = rss;
}
if (GenericFeedFormatter == null)
{
return null;
}
GenericFeedFormatter.ReadFrom(reader);
feed = GenericFeedFormatter.Feed;
}
}
}
catch (XmlException)
{
// Do nothing, but don't shut down
// This will also make the function return null
}
return feed;
}
private SyndicationFeed GetFeed(string url)
{
using (XmlReader reader = XmlReader.Create(url))
{
Rss20FeedFormatter rss = new Rss20FeedFormatter();
if (rss.CanRead(reader))
{
rss.ReadFrom(reader);
return rss.Feed;
}
Atom10FeedFormatter atom = new Atom10FeedFormatter();
if (atom.CanRead(reader))
{
atom.ReadFrom(reader);
return atom.Feed;
}
}
return null;
}
private void Read(Stream stream, Channel c, RssViewModel m)
{
var feedFormatter = new Atom10FeedFormatter();
var rssFormater = new Rss20FeedFormatter();
XmlReader atomReader = XmlReader.Create(stream);
SyndicationFeedFormatter f = null;
if (feedFormatter.CanRead(atomReader))
{
feedFormatter.ReadFrom(atomReader);
atomReader.Close();
f = feedFormatter;
}
else
if (rssFormater.CanRead(atomReader))
{
rssFormater.ReadFrom(atomReader);
atomReader.Close();
f = rssFormater;
}
if (f == null) return;
SyndicationFeed feed = f.Feed;
c.Title = feed.Title.Text;
Article[] articles = feed.Items.Select(item => new Article
{
PubDate = item.PublishDate.DateTime,
Description = item.Summary.Text,
Link = item.Links[0].Uri.OriginalString,
Title = item.Title.Text,
}).Select(art => m.AddArticle(art, c)).ToArray();
m.DeleteArticle(c.Articles.Where(x => !x.IsStared).Except(articles).ToArray(), c);
c.LastUpdate = DateTime.Now;
}