How Can I Change Xml Attribute?

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Hi to all . I'm looking for advice .
I have an XML file , and my task is to change the attribute of node . But when i make this a have an error:
"Namespace Manager or XsltContext needed" .
My xml file :

XML

<?xml version="1.0" encoding="UTF-8"?>
<soapenv:Envelope xmlns:soapenv="http://somelink.com">

my code :

C#

XmlDocument docreq = new XmlDocument();
    docrev.Load("Mynew.xml");
     XmlNode node = docreq.SelectSingleNode("soapenv:Envelope");
   node.Attributes[0].Value = "NEWLINK";
  using (TextWriter writer = new StreamWriter("Mynew.xml", false, Encoding.UTF8))
docreq.Save(writer);

How I can change the attribute to NEWLINK without this error?

Posted 13-Apr-15 4:03am

Andrey Golubtsov

Updated 13-Apr-15 21:35pm

v3

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Comments

Sergey Alexandrovich Kryukov 13-Apr-15 10:20am

Not clear. You are using a reader and only read. How can you change anything, where? What are you trying to achieve?
—SA

Andrey Golubtsov 13-Apr-15 10:33am

I select node : XmlNode node = docreq.SelectSingleNode("soapenv:Envelope");
and in this node i want to change attribute xmlns:soapenv="http://somelink.com" .
I had: soapenv:envelope xmlns:soapenv="http://somelink.com"
I want to change it like : <soapenv:envelope xmlns:soapenv="NEWLINK">

Sergey Alexandrovich Kryukov 13-Apr-15 10:43am

You can change some attribute only somewhere, in data or in the file. If a file, you need to write a file. Or you need to write something in data in memory.
—SA

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Member 11286812 · Answer 1 · 2015-04-13T04:50:00

Solution 3

C#

XDocument xDocument = XDocument.Load("MyXml.xml");

XElement soapenvXElement = xDocument.Descendants().FirstOrDefault();

soapenvXElement.Value = "NEWLINK";

Posted 13-Apr-15 4:50am

Member 11286812

Comments

Andrey Golubtsov 13-Apr-15 10:59am

This doesn't work.