C#: Null reference exception thrown while using XmlDocment

Question

A NullReferenceException is thrown by the runtime when I convert XElement into XmlNode using the following function:

public static XmlNode GetXmlNode(this XElement element)
{
    using (XmlReader xmlReader = element.CreateReader())
    {
        XmlDocument xmlDoc = new XmlDocument();
        xmlDoc.Load(xmlReader);
        xmlDoc.ChildNodes[4].InnerXml = "0.15"; ====> null reference exception occurs here
        return xmlDoc;
    }
}

How can I convert XElement to XmlNode without this problem?

Does ChildNodes (an XmlNodeList) throw an index out of range exception or return null when you try to access a node that does not exist? Are you sure the node you are trying to change exists? — Andrew Kennan
– Andrew Kennan, Commented Oct 21, 2010 at 4:31

Ahmad Mageed · Accepted Answer · 2010-10-21 04:59:35Z

2

Access the DocumentElement first in order to get the root:

xmlDoc.DocumentElement.ChildNodes[4].InnerXml = "0.15";

EDIT: an XmlDocument inherits from XmlNode. You should be able to simply do this:

XmlNode node = xmlDoc.DocumentElement;
return node;

If you need to cast it for a particular method you could use (XmlNode)xmlDoc.DocumentElement or xmlDoc.DocumentElement as XmlNode.

edited Oct 21, 2010 at 4:59

answered Oct 21, 2010 at 4:36

Ahmad Mageed

96.9k20 gold badges170 silver badges177 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

ratty Over a year ago

how can i convert it into XMLNode

Collectives™ on Stack Overflow

C#: Null reference exception thrown while using XmlDocment

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related