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.
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Michael Kniskern
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A complex type defined in the .NET Framework seems like a poor choice for a parameter to a Web Service. If the service is yours, you might look into changing the type to string. That would also let you call it from other languages/platforms with relative ease. – TrueWill Mar 05 '10 at 02:26
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@TrueWill - The service is not mine, it is a third paty vendor serivce. – Michael Kniskern Mar 05 '10 at 11:54
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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.
Lachlan Roche
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If you need to refer to it explicitly as an XmlNode use "as":
XmlDocument doc = ...
XmlNode node = doc as XmlNode;
xcud
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An XmlDocument is derived from XmlNode, but you could also send the XmlDocument.DocumentElement which is an XmlElement but ultimately derived from XmlNode. You might need to check in XmlDocument.DocumentElement == null.
Ryan
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