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Parse podcast RSS feed in C#

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Last Modified: 2013-11-18
I am having some difficulty with podcast RSS feeds.  I am able to read the feed in and parse the tags without a problem, but I run into problems as I iterate through each item in the channel and trying to figure out which attribute actually has the link to the MP3.  

Some feeds use the link tag, others use the enclosure and then there are the itunes tags.  Is there any advice on the best way to handle this?

This is the code I'm currently working with.
if (string.IsNullOrEmpty(url))
                throw new ArgumentNullException("url");
 
           RSSFeed feed = new RSSFeed();
 
            try
            {
                string content = GetURLSource(url);
                XmlDocument rssDoc = new XmlDocument();
                rssDoc.LoadXml(content);
                XmlNodeList rssNodes = rssDoc.SelectNodes("/rss/channel/item");
 
                feed.Link = rssDoc.SelectSingleNode("/rss/channel/link") != null ? rssDoc.SelectSingleNode("/rss/channel/link").InnerText : string.Empty;
                feed.Title = rssDoc.SelectSingleNode("/rss/channel/title") != null ? rssDoc.SelectSingleNode("/rss/channel/title").InnerText : string.Empty;
                feed.Description = rssDoc.SelectSingleNode("/rss/channel/description") != null ? rssDoc.SelectSingleNode("/rss/channel/description").InnerText : string.Empty;
 
                if (rssNodes != null)
                    foreach (XmlNode node in rssNodes)
                    {
                        RSSEvent rssEvent = new RSSEvent
                        {
                            CopyRight = node.SelectSingleNode("copyright") != null ? node.SelectSingleNode("copyright").InnerText : string.Empty,
                            Description = node.SelectSingleNode("description") != null ? node.SelectSingleNode("description").InnerText : string.Empty,
                            Link = node.SelectSingleNode("link") != null ? node.SelectSingleNode("link").InnerText : string.Empty,
                            PubDate = node.SelectSingleNode("pubdate") != null ? node.SelectSingleNode("pubdate").InnerText : string.Empty,
                            Title = node.SelectSingleNode("title") != null ? node.SelectSingleNode("title").InnerText : string.Empty,
                            EnclosureUrl = node.SelectSingleNode("enclosure") != null ? node.SelectSingleNode("enclosure").Attributes["url"].InnerText : string.Empty,
                            EnclosureType = node.SelectSingleNode("enclosure") != null ? node.SelectSingleNode("enclosure").Attributes["type"].InnerText : string.Empty,
                            EnclosureLength = node.SelectSingleNode("enclosure") != null ? node.SelectSingleNode("enclosure").Attributes["length"].InnerText : string.Empty
                        };
 
                        feed.Events.Add(rssEvent);
                    }
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message, ex.InnerException);
            }
 
            return feed;

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Author

Commented:
Excellent response.  However I need to find a clean way of differentiating between a podcast feed and an iTunes feed.

Author

Commented:
... also, you list an interface called IRssHandler.  Is there code for that please?
IRssHandler is the base interface for all of the "RSS Handlers".  It would look something like this:
public interface IRssHandler
{
    ///<Summary>Parse the root element of the feed and build a Feed object</Summary>
    public Feed parseFeed();
    ///<Summary>Parse the feed events into RSSEvent collection</Summary>
    public RSSEvent[] parseEvents();
}

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To check if it is a iTunes feed you should just check to see if it has an itunes namespace.  Something like this:
if (rssDoc.DocumentElement.GetAttribute("xmlns:itunes")!="")
  handler=new iTunesRSSHandler(rssDoc);
else if //Other rss types here

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Author

Commented:
Thanks!  Excellent advice.
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