Reading the Stack Overflow RSS feed

Question

I'm trying to get a list of unanswered questions from the feed, but I am having trouble reading it.

const string RECENT_QUESTIONS = "https://stackoverflow.com/feeds"; XmlTextReader reader; XmlDocument doc; // Load the feed in reader = new XmlTextReader(RECENT_QUESTIONS); //reader.MoveToContent(); // Add the feed to the document doc = new XmlDocument(); doc.Load(reader); // Get the <feed> element XmlNodeList feed = doc.GetElementsByTagName("feed"); // Loop through each item under feed and add to entries IEnumerator ienum = feed.GetEnumerator(); List<XmlNode> entries = new List<XmlNode>(); while (ienum.MoveNext()) { XmlNode node = (XmlNode)ienum.Current; if (node.Name == "entry") { entries.Add(node); } } // Send entries to the data grid control question_list.DataSource = entries.ToArray();

I hate to post such a "please fix the code" question, but I'm really stuck. I've tried several tutorials (some giving compile errors) but to no help. I assume I'm going the right way using an XmlReader and an XmlDocument as that's been a common thing from each guide.

Can you say what errors you are getting and what it is doing incorrectly? — mmcdole
– mmcdole, Commented Feb 1, 2009 at 21:51
You might consider using msdn.microsoft.com/en-us/library/… instead. — Brian
– Brian, Commented Feb 1, 2009 at 21:51
@Simucal: It's just not providing any data, no errors as such. @Brian: I looked at that and thought it was for creating feeds only. I'll give it a try. — Ross
– Ross, Commented Feb 1, 2009 at 22:00

Luke Woodward · Accepted Answer · 2009-02-01 22:52:21Z

Your enumerator ienum contains only element, the <feed> element. Nothing gets added to entries since this node's name is not entry.

I'm guessing you want to iterate over the child nodes of the <feed> element instead. Try the following:

const string RECENT_QUESTIONS = "http://stackoverflow.com/feeds"; XmlTextReader reader; XmlDocument doc; // Load the feed in reader = new XmlTextReader(RECENT_QUESTIONS); //reader.MoveToContent(); // Add the feed to the document doc = new XmlDocument(); doc.Load(reader); // Get the <feed> element. XmlNodeList feed = doc.GetElementsByTagName("feed"); XmlNode feedNode = feed.Item(0); // Get the child nodes of the <feed> element. XmlNodeList childNodes = feedNode.ChildNodes; IEnumerator ienum = childNodes.GetEnumerator(); List<XmlNode> entries = new List<XmlNode>(); // Iterate over the child nodes. while (ienum.MoveNext()) { XmlNode node = (XmlNode)ienum.Current; if (node.Name == "entry") { entries.Add(node); } } // Send entries to the data grid control question_list.DataSource = entries.ToArray();

Thank you, this has really helped me to understand how to iterate through XML nodes now!

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