/// <summary>
/// Copies any parse errors to the channel.
/// </summary>
/// <param name="channel">The channel being created by this parser.</param>
private void SaveParseErrors(PodcastChannel channel)
{
foreach (string error in ParseErrors)
{
channel.ParseErrors.Add(error);
}
}
public static async Task <PodcastChannel> FromPodcastUrl(string url, bool showUnparsedContent)
{
WebRequest request = WebRequest.Create(url);
WebResponse response = request.GetResponse();
Stream s = response.GetResponseStream();
var reader = new StreamReader(s);
string xml = await reader.ReadToEndAsync();
reader.Close();
var parser = new PodcastChannelParser(xml);
parser.RemoveParsedContent = showUnparsedContent;
PodcastChannel channel = await Task.Run(() => parser.Parse());
channel.PodcastXml = xml;
return(channel);
}
/// <summary>
/// Initializes a new instance of the <see cref="PodcastChannelParser"/> class.
/// </summary>
/// <param name="rssData">The RSS XML document to parse.</param>
public PodcastChannelParser(string rssData) : base(rssData)
{
_channel = new PodcastChannel();
using (var stringWriter = new StringWriter(new StringBuilder(), CultureInfo.InvariantCulture))
{
var xmlTextWriter = new XmlTextWriter(stringWriter)
{
Formatting = Formatting.Indented
};
XmlDocument xDoc = new XmlDocument();
using (var r = new StringReader(rssData))
{
xDoc.Load(r);
xDoc.Save(xmlTextWriter);
_channel.PrettyRssData = stringWriter.ToString();
}
}
}
/// <summary>
/// Updates the channel with any new episodes which have been published.
/// </summary>
/// <returns>Nothing - it's a <see cref="Task"/>.</returns>
public async Task UpdateChannel()
{
PodcastChannel latestChannel = await FromPodcastUrl(RssUrl, false);
var episodeGuids = new Collection <string>();
// Get the guids of the episodes we already know about
foreach (PodcastEpisode episode in Episodes)
{
episodeGuids.Add(episode.Guid);
}
// Add any published episodes that we don't already know about
foreach (PodcastEpisode episode in latestChannel.Episodes)
{
if (!episodeGuids.Contains(episode.Guid))
{
Episodes.Add(episode);
}
}
// FIXME: user needs to switch to another channel and back to see the new episodes
// TODO: consider updating other channel metadata if different to local copy
}
