asked on

rookie problem with xml namespaces in c#

Hi EE,
I need to add multiple namespaces for Xpath a document. I recently closed a question for one namespace but Im
not sure what happens when I need to add multiple namespaces.

<?xml version="1.0" encoding="utf-8"?>
<test xsi:schemaLocation="xxx" xmlns="xxx" xmlns:apd="xxx" xmlns:bs7666="xxx" xmlns:xsi="xxx" xmlns:con="xxx">
<testdata1>example</testdata1>
<testdata2>today</testdata2>
<testdata3>monday</testdata3>

any ideas how I can add multiple namespaces using c# so I can iterate through XmlNodeList?
Many thanks,

XmlDocument xmldoc = new XmlDocument();
            XmlNamespaceManager nsMgr = new XmlNamespaceManager(xmldoc.NameTable);
            nsMgr.AddNamespace("xmlns:apd", "ass");
            nsMgr.AddNamespace("??", "xxxx");
            nsMgr.AddNamespace("??", "xxxx");
            nsMgr.AddNamespace("??", "xxxx");
            xmldoc.LoadXml(xstring);
            XmlNodeList nodeList = xmldoc.SelectNodes("??", nsMgr);
 
            foreach (XmlNode Xnode in nodeList)
            {
            }

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ASKER CERTIFIED SOLUTION

kruegerste

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kruegerste

https://www.experts-exchange.com/questions/21860351/Multiple-Namespaces-XPath-with-C.html?sfQueryTermInfo=1+multipl+namespac

kruegerste

http://bytes.com/groups/net-xml/178416-selectsinglenode-multiple-namespaces-sort

jimbona27

ASKER

I've tried this although I get the object not set runtime error.

any reason why this error would happen?

            string test = string.Empty;
            XmlDocument _XML = new XmlDocument();
            _XML.LoadXml(xstring);
            XmlNamespaceManager manager = new XmlNamespaceManager(_XML.NameTable);            
            manager.AddNamespace("bs7666", "http://www.govtalk.gov.uk/people/bs7666");
            manager.AddNamespace("apd", "xxx");
            manager.AddNamespace("con", "xxx");
            manager.AddNamespace("xsi", "xxx");
            test = _XML.SelectSingleNode("//theroot/myfield", manager).InnerText;  // errors on this line

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kruegerste

You need to use the prefixes of the namespaces created, as such:

("//apd:testdata1", manager) or just ("//apd:testdata1").InnerText

kruegerste

http://asp.dotnetheaven.com/howto/doc/Xml/XPathWithXmlDocs.aspx

jimbona27

ASKER

how do you know its prefixed with "apd" and not one of the other ones? i.e. con, xsi etc...

thanks,

jimbona27

ASKER

using this example, i still get the object is not set.


            string test = string.Empty;
            XmlDocument _XML = new XmlDocument();
            _XML.LoadXml(xstring);
            XmlNamespaceManager manager = new XmlNamespaceManager(_XML.NameTable);            
            manager.AddNamespace("xx", "http://www.govtalk.gov.uk/people/bs7666");
            manager.AddNamespace("apd", "http://www.govtalk.gov.uk/people/AddressAndPersonalDetails");
            manager.AddNamespace("con", "http://www.govtalk.gov.uk/people/ContactTypes");
            manager.AddNamespace("xsi", "http://www.w3.org/2001/XMLSchema-instance");
            test = _XML.SelectSingleNode("//apd:ServiceDescription/DC.Date.Modified", manager).InnerText;            
            test = "";

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jimbona27

ASKER

i can get it working using this code instead????

so why use the selectsinglenode if this other code works?


 
                //Xmlvalue = xDoc.SelectSingleNode("//apd:ServiceDescription/DC.Date.Modified", mngr).InnerText;
                XmlNodeList test = xDoc.GetElementsByTagName("DC.Date.Modified");
 
                foreach (XmlNode Xnode in test)
                {
                    Xmlvalue = Xnode.InnerText;
                }
 
 
//Xmlvalue holds the date value that I want...

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kruegerste

Yeah, if that works, then use it. There are different ways to do any one thing. Here it depends on your Xml markup and expected results which I don't know of.

Tony McCreath

Could you provide the xml.

I would guess DC.Date.Modified is within a namespace as well. Probably also apd:

//apd:ServiceDescription/apd:DC.Date.Modified

jimbona27

ASKER

<?xml version="1.0" encoding="utf-8"?>
<ServiceDescription xsi:schemaLocation="http://dcsf.gov.uk/XMLSchema/ServiceDirectory ServiceTypes-v1-3c.xsd" xmlns="http://dcsf.gov.uk/XMLSchema/ServiceDirectory" xmlns:apd="http://www.govtalk.gov.uk/people/AddressAndPersonalDetails" xmlns:bs7666="http://www.govtalk.gov.uk/people/bs7666" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:con="http://www.govtalk.gov.uk/people/ContactTypes">
<DC.Contributor Href="href text" Role="role text">contributor text</DC.Contributor>
<DC.Creator>DCCreator</DC.Creator>
<DC.Date.Created>2001-10-19T00:00:00</DC.Date.Created>
<DC.Date.Issued>2008-12-28T09:17:51.370</DC.Date.Issued>
<DC.Date.Modified>2009-02-02T09</DC.Date.Modified>
...

SOLUTION

Tony McCreath

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jimbona27

ASKER

im using this code although i know it only returns one for DC.Date.Modified and one for DC.Identifier, seems
stupid to be in a foreach, is there a way to get it out?

XmlNodeList xList = xDoc.GetElementsByTagName("DC.Date.Modified");

foreach (XmlNode Xnode1 in xList)
{
DCDateModified = Xnode1.InnerText;
}

xList = xDoc.GetElementsByTagName("DC.Identifier");
foreach (XmlNode Xnode2 in xList)
{
DCIdentifier = Xnode2.InnerText;
}

i.e.

string DCIdentifier = string.empty;
DCIdentifier = (XmlNode)xList[0].InnerText; // does not work??

is this logically better or ugly?