Question

I am trying to traverse through a simple sitemap (adding and deleting elements on the fly.) This is the sample layout

<?xml version='1.0' encoding='UTF-8'?> <urlset       xmlns='http://www.sitemaps.org/schemas/sitemap/0.9'       xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'       xsi:schemaLocation='http://www.sitemaps.org/schemas/sitemap/0.9             http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd'>   <url>     <loc>http://mysite.com/</loc>     <priority>1.00</priority>     <changefreq>daily</changefreq>   </url>   <url>     <loc>http://mysite.com/Default.aspx</loc>     <priority>0.80</priority>     <changefreq>daily</changefreq>   </url> </urlset> 

Weirdly when I try to access a child element using the Element() method after loading the document, it’s null, and so is Elements(), so I can’t traverse through them. The Nodes() method has the elements though.

Here’s the code I wrote

XElement siteMap = XElement.Load(Server.MapPath('~/sitemap.xml'));  //First remove all article nodes foreach (XElement elem in siteMap.Elements()) {     XElement loc = elem.Element('loc');     if (loc.Value.Contains('http://mysite.com/articles/'))         elem.Remove(); } 

No matter what I do to try and retrieve the elements of elem (Element, Elements), I get a null.

What could be wrong? This code is supposed to run. Isn’t it?

Answer 1

var doc = XDocument.Load(Server.MapPath('~/sitemap.xml')); foreach (XElement elem in doc.Root.Elements()) {      var loc = elem.Element(XName.Get('loc','http://www.sitemaps.org/schemas/sitemap/0.9') );      if (loc.Value.Contains('http://astrobix.com/articles/'))          elem.Remove(); } 

You could also do the following instead:

doc.Root.Elements()    .Where(x => x.Element(XName.Get('loc', 'http://www.sitemaps.org/schemas/sitemap/0.9'))                 .Value.Contains('http://astrobix.com/articles/'))    .Remove();