移动到LINQ到XML C＃的节点值？

Question

I am trying get the email value under author node in C#. But nothing is coming. My Code is=

XDocument xDoc = XDocument.Parse("myxml");
var foos = from xelem in xDoc.Descendants("author")
               select xelem.Element("email").Value;

XML which i am using is -

<?xml version="1.0" encoding="UTF-8"?>
<feed xmlns="http://www.w3.org/2005/Atom" xmlns:batch="http://schemas.google.com/gdata/batch" 

xmlns:gContact="http://schemas.google.com/contact/2008" xmlns:gd="http://schemas.google.com/g/2005" 

xmlns:openSearch="http://a9.com/-/spec/opensearchrss/1.0/">
 <id>yogeshcp13@gmail.com</id>
 <updated>2015-02-09T04:03:31.220Z</updated>
 <category scheme="http://schemas.google.com/g/2005#kind" term="http://schemas.google.com/contact/2008#contact"/>
 <title type="text">Yogesh Adhikari's Contacts</title>
 <link rel="alternate" type="text/html" href="https://www.google.com/"/>
 <link rel="next" type="application/atom+xml" href="https://www.google.com/m8/feeds/contacts/yogeshcs2003%40gmail.com/full?max-

results=1&amp;start-index=2"/>
 <author>
  <name>Yogesh Adhikari</name>
  <email>yogeshcp13@gmail.com</email>
 </author>
 <generator version="1.0" uri="http://www.google.com/m8/feeds">Contacts</generator>
 <openSearch:totalResults>3099</openSearch:totalResults>
 <openSearch:startIndex>1</openSearch:startIndex>
 <openSearch:itemsPerPage>1</openSearch:itemsPerPage>
</feed>

Can someone point out what is wrong? Thanks

Answer 1

You need to specify the namespace along with the name when getting the descendants.

XDocument xDoc = XDocument.Parse("myxml");
string ns = xDoc.Root.Name.Namespace;

var foos = from xelem in xDoc.Descendants(ns + "author")
           select xelem.Element(ns + "email").Value;

Alternatively, you can find your nodes by getting an enumeration over all descendants, then filtering by LocalName . If email is a node only within author s in your schema, you can also avoid the unnecessary step of drilling down from author nodes, and just find your email nodes directly:

var foos = xdoc.Descendants().Where(e => e.Name.LocalName == "email");

Answer 2

XDocument xDoc = XDocument.Load("myxml.xml");
var foos = xDoc.Descendants().Where(e => e.Name.LocalName == "email");
Console.WriteLine(foos.FirstOrDefault().Value);

Use Load method if you are refering to xml file else parse should be fine. Also make sure xml is along with your binaries' folder if not using specific path.