How to read stackoverflow rss feed using linq to xml

Question

I am trying read rss feed of stack overflow using Linq to xml. I am unable to get the entry nodes, as it is returning empty list. This I've tried so far, can any one point out what i am doing wrong here?

Here I am binding to the grid view:

private void StackoverflowFeedList()
{
    grdFeedView.DataSource = StackoverflowUtils.GetStackOverflowFeeds();
    grdFeedView.DataBind();
}

This is the method which will get all feeds:

public static IEnumerable<StackOverflowFeedItems> GetStackOverflowFeeds ()
{
    XNamespace Snmp = "http://www.w3.org/2005/Atom";
    XDocument RssFeed = XDocument.Load(@"http://stackoverflow.com/feeds");
    var posts = from item in RssFeed.Descendants("entry")
                select new StackOverflowFeedItems
                {
                   QuestionID = item.Element(Snmp +"id").Value,
                   QuestionTitle = item.Element(Snmp +"title").Value,
                   AuthorName = item.Element(Snmp +"name").Value,
                   CategoryTag = (from category in item.Elements(Snmp +"category")
                                  orderby category
                                  select category.Value).ToList(),
                   CreatedDate = DateTime.Parse(item.Element(Snmp +"published").Value),
                   QuestionSummary = item.Element(Snmp +"summary").Value
                };
    return posts.ToList();
}

And this is the class I am using for binding:

public class StackOverflowFeedItems
{
    public string   QuestionID { get; set; }
    public string   QuestionTitle { get; set; }
    public IEnumerable<string> CategoryTag { get; set; }
    public string AuthorName { get; set;  }
    public DateTime CreatedDate { get; set; }
    public string QuestionSummary { get; set; }
}

Why you don't want to use "classic" approach with SyndicationFeed Class? msdn.microsoft.com/en-us/library/… — NoWar
– NoWar, Commented Jan 27, 2012 at 10:12

Jon Skeet · Accepted Answer · 2012-01-27 10:20:07Z

4

You're not using the namespace variable you've declared. Try using

RssFeed.Descendants(Snmp + "entry")

(And likewise for all other places where you're referring to particular names.)

I'm not saying that's necessarily all of what you need to fix, but it's the most obvious problem. You should also consider using the explicit conversions of XElement and XAttribute instead of the Value property, e.g.

CreatedDate = (DateTime) item.Element(Snmp +"published")

I'd also encourage you to pay more attention to indentation, and use pascalCase consistently when naming local variables. (Quite why the namespace variable is called Snmp is another oddity... cut and paste?)

edited Jan 27, 2012 at 10:20

answered Jan 27, 2012 at 10:11

Jon Skeet

1.5m893 gold badges9.3k silver badges9.3k bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Ravi Gadag Over a year ago

i added that Snmp, but it is not returning any thing. empty results, check my edited question

Jon Skeet Over a year ago

@Ravi: You're still not doing it on the first call: RssFeed.Descendants("entry").

Ravi Gadag Over a year ago

i am getting Object reference not set to an instance of an object.

Collectives™ on Stack Overflow

How to read stackoverflow rss feed using linq to xml

1 Answer 1

3 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related