XLINQ + OrderBy Clause

Question

 

Let's pretend we are using the XML described in the following post by ScottGu: http://weblogs.asp.net/scottgu/archive/2007/08/07/using-linq-to-xml-and-how-to-build-a-custom-rss-feed-reader-with-it.aspx

 

Let's pretend that each Feed element had a child element called "Created" that contained the date and time that the Feed was created.

 

How could you order the results by the Created element using XLINQ?  Everytime I use the orderby clause, I receive a runtime error that says "At least one object must implement IComparable."

 

Thank you,

Bill

Answer 1

Try the following:

 

        static void Main() {
            XDocument d = XDocument.Parse(@"
<Feeds>
    <Feed>
        <Name>ScottGu Blog</Name>
        <Created>2007-08-04</Created>
    </Feed>
    <Feed>
        <Name>Weblogs.ASP.NET Main Feed</Name>
        <Created>2007-08-06</Created>
    </Feed>
    <Feed>
        <Name>Bozo Blog</Name>
        <Created>2007-08-05</Created>
    </Feed>
</Feeds>
");
            var q = from feed in d.Descendants("Feed")
                    orderby (DateTime)feed.Element("Created") ascending
                    select feed;
            foreach (XElement feed in q)
                Console.WriteLine(feed);
        }

 

Ion

Answer 2

Doh!

 

I was using the feed.Descendents instead of feed.Element.  Thank you so much!

 

Bill