How to get XML namespace?

Question

I tried using this code: [C#]

var textReader = new XmlTextReader(path);
if (textReader.NamespaceURI == "http://www.portalfiscal.inf.br/nfe")
{
  //...
}

My XML:

<?xml version="1.0" encoding="utf-8"?>
<NFe xmlns="http://www.portalfiscal.inf.br/nfe">
<infNFe version="2.00" Id="NFe31130317194994450127550012302143751002144567">
<ide>
//continue...

But my code always returns "" ...

Is there a easy way to get XML namespace?

new XmlTextReader() has been deprecated since .NET 2.0. You should be using XmlReader.Create() instead. Depending on what else you're doing with the XML, you'll find LINQ to XML much easier than playing with XmlReaders. — John Saunders
– John Saunders, Commented May 20, 2013 at 17:58

Steve B · Accepted Answer · 2013-05-20 15:16:46Z

2

Your code will return the namespaceUri of the current node.

Try to advance in the xml stream:

var textReader = new XmlTextReader(path);
while(reader.NodeType != XmlNodeType.Element) textReader.Read();
if (textReader.NamespaceURI == "http://www.portalfiscal.inf.br/nfe")
{
  //...
}

answered May 20, 2013 at 15:16

Steve B

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BLoB · Accepted Answer · 2013-05-20 15:20:56Z

1

Here's a nice linq method:

XDocument z = XDocument.Parse(s);
var result = z.Root.Attributes().
    Where(a => a.IsNamespaceDeclaration).
    GroupBy(a => a.Name.Namespace == XNamespace.None ? String.Empty : a.Name.LocalName,
            a => XNamespace.Get(a.Value)).
    ToDictionary(g => g.Key, 
                 g => g.First());

Find this method and more at hanselmans site: Get namespaces from an XML Document with XPathDocument and LINQ to XML

Then just loop through the dictionary as desired.

answered May 20, 2013 at 15:20

BLoB

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