How do I change the value of an attribute that has a namespace?

Question

Following is the XML format:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE ncx PUBLIC "-//NISO//DTD ncx 2005-1//EN" "http://www.daisy.org/z3986/2005/ncx-2005-1.dtd">
<ncx xmlns="http://www.daisy.org/z3986/2005/ncx/" version="2005-1" xml:lang="en">
<head>
<meta name="dtb:uid" content="0000000000000"/>
<meta name="dtb:depth" content="1"/>
<meta name="dtb:totalPageCount" content="pageNumber"/>
<meta name="dtb:maxPageNumber" content="0"/>
</head>
</ncx>

I need to change the value of xml:lang but I don't know how to do it.

My C# Code:

xtabdoc.Root.Descendants().FirstOrDefault(el =>(string)el.Attribute(XNamespace.Xml + "lang") == "en");

It showed null.

Please help.

Anu Viswan · Accepted Answer · 2019-03-04 13:19:05Z

1

You can get the Element by using following.

var result = XDocument.Parse(xmlString).Descendants().FirstOrDefault(el =>(string)el.Attribute(XNamespace.Xml + "lang") == "en");

The key lies in fact that Element lies in the Root. So when you use Root.Descendants, you are not considering the Node, which is why you got null.

answered Mar 4, 2019 at 13:19

Anu Viswan

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Comments

jdweng · Accepted Answer · 2019-03-04 13:21:34Z

0

Easy :

           XDocument doc = XDocument.Load(FILENAME);
            XElement root = doc.Root;
            XAttribute lang = root.Attributes().Where(x => x.Name.LocalName == "lang").FirstOrDefault();
            lang.SetValue("abc");

answered Mar 4, 2019 at 13:21

jdweng

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