Get value of attribute of an XML node (with namespaces)

Question

Here's the XML file

<?xml version="1.0" encoding="UTF-8"?>
<container version="1.0" xmlns="urn:oasis:names:tc:opendocument:xmlns:container">
<rootfiles>
<rootfile media-type="application/oebps-package+xml" full-path="EPUB/wasteland.opf"/>
</rootfiles>
</container>

And here's my code

      XElement XmlElement;
      XmlElement =  XElement.Load(containerXml.Stream);


      TextBlock tbl= new TextBlock();
      foreach (XElement level1Element in XmlElement.Elements("rootfiles"))
      {
          foreach (XElement level2Element in level1Element.Elements("rootfile"))
          {
              tbl.Text = level2Element.Attribute("full-path").Value;
          }
      }

The textblock should change to "EPUB/wasteland.opf" but why it wouldn't?

You know that you are assigning text in a loop? That means only last value will stay — Sergey Berezovskiy
– Sergey Berezovskiy, Commented Jun 27, 2013 at 22:04
I know, but there's only one value. It should be that one, isn't it? — Tuấn Nguyễn
– Tuấn Nguyễn, Commented Jun 27, 2013 at 22:06
Simply get single value with FirstOrDefault() of SingleOrDefault() method — Sergey Berezovskiy
– Sergey Berezovskiy, Commented Jun 27, 2013 at 22:11
OH It worked, thank you very much, i didn't notice the Namespace, this problem took me a day so awful — Tuấn Nguyễn
– Tuấn Nguyễn, Commented Jun 27, 2013 at 22:15

Sergey Berezovskiy · Accepted Answer · 2013-06-27 22:07:11Z

1

You are missing namespace:

var xdoc = XDocument.Load(containerXml.Stream);
XNamespace ns = "urn:oasis:names:tc:opendocument:xmlns:container";
var path = xdoc.Descendants(ns + "rootfile")
                .Select(r => (string)r.Attribute("full-path"))
                .FirstOrDefault();

And you can assign path to text block:

tbl.Text = path;

answered Jun 27, 2013 at 22:07

Sergey Berezovskiy

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