Parse an XML file with namespace using XPath

Question

Parse an XML file with namespace using XPath

JORGE MALDONADO BARRERA 211

I have been trying to parse an XML file with C# without success. I need to use the SelectSingleNode and SelectNodes methods to get, for example, the information for the path /cfdi:Comprobante/cfdi:Conceptos/cfdi:Concepto/cfdi:Impuestos/cfdi:Traslados. The situation I am facing is the namespace, I have not found a way to deal with it.

I have done several thing like the code below, "playing" with the nsmgr namespace variable and the path for the nodes variable without success.

XmlDocument doc = new XmlDocument();
doc.Load("c:/725.xml");
XmlElement root = GetRoot();

var nsmgr = new XmlNamespaceManager(doc.NameTable);
nsmgr.AddNamespace("ex", "cfdi");

var nodes = root.SelectNodes("/Comprobante/Conceptos/Concepto/Impuestos/traslados", nsmgr);

return View();

I attach the XML file for your reference.

725.xml

Bestr regards.

Anonymous

2023-12-15T01:57:45.12+00:00

Hi @JORGE MALDONADO BARRERA , Welcome to Microsoft Q&A,

Use the full namespace URI in AddNamespace method.

Make sure to include the namespace prefix in your XPath expressions.

Use SelectNodes on the XmlDocument directly, no need to retrieve the root element separately.

This example assumes that your XML file has the correct namespaces defined. The XML file you provided seems to be using the "http://www.sat.gob.mx/cfd/3" namespace, so the code above uses "cfdi" as the namespace prefix.

Make sure to adjust the namespace URI and prefix according to your XML file. If this still doesn't work, check your XML file for typos or discrepancies in namespace declarations.

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Anonymous

2023-12-15T01:57:45.12+00:00

Hi @JORGE MALDONADO BARRERA , Welcome to Microsoft Q&A,

Use the full namespace URI in AddNamespace method.

Make sure to include the namespace prefix in your XPath expressions.

Use SelectNodes on the XmlDocument directly, no need to retrieve the root element separately.

This example assumes that your XML file has the correct namespaces defined. The XML file you provided seems to be using the "http://www.sat.gob.mx/cfd/3" namespace, so the code above uses "cfdi" as the namespace prefix.

Make sure to adjust the namespace URI and prefix according to your XML file. If this still doesn't work, check your XML file for typos or discrepancies in namespace declarations.

Answer 1

Viorel 122.6K

Try this:

XmlDocument doc = new XmlDocument( );
doc.Load( @"C:\725.xml" );

var nsmgr = new XmlNamespaceManager( doc.NameTable );
nsmgr.AddNamespace( "cfdi", "http://www.sat.gob.mx/cfd/4" );

var nodes = doc.SelectNodes( "/cfdi:Comprobante/cfdi:Conceptos/cfdi:Concepto/cfdi:Impuestos/cfdi:Traslados", nsmgr );

JORGE MALDONADO BARRERA 211 Reputation points

2023-12-15T16:14:22.61+00:00

Thanks for your feedback. I should have put more attention to the IntelliSense information while typing AddNamespace because it shows that the first argument refers to the prefix. I tried typing something else but not the prefix.

Answer 2

xml namespaces have two parts, the namespace and the prefix. the namespace must be consistent between documents, but the prefix need not match. that is each document can define its one unique prefix for the same namespace. in your case cfdi: is a prefix for a unique namespace. in the source xml document, you need to get the actual namespace. while it is less confusing to use the same prefix's as document, but not required.

so when you add the namespace, the prefix need only match what you use in the xpaths, but the namespace must match the value in the document.

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Parse an XML file with namespace using XPath

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