Question

How do I convert an XmlDocument to a XmlNode in C#? I need to send the entire XmlDocument object to as an input parameter to a .NET web service.

Answer 1

A XmlDocument is a XmlNode, so you can just pass the document object.

Or you could send its DocumentElement, or any Node returned from an XPath query.

XmlDocument doc = null;
XmlNode node = doc;

XmlNode node = doc.DocumentElement;

XmlNode node = doc.SelectSingleNode("/foo/bar");

No casting or converting is needed unless you need to disambiguate XmlNode from XmlDocument for a method with overloads for both parameter types. If this is the case, use either of the cast or as operators.