Using XPath with namespaces

[orange]

Hello,

I have been trying to get data from an xml file with a namespace. I
have followed the example in the MSDN, but I get no data in t he
XPathNodeIterator, but the file has the data I am trying to extract.

...
XPathNavigator navigator = xmlDoc.CreateNavigator();
// xpathQuery = "/ProductInformation/ProductNumber"
XPathExpression expr = navigator.Compile( xpathQuery );
expr = navigator.Compile( xpathQuery );

XmlNamespaceManager nsmgr = new XmlNamespaceManager( navigator.NameTable
);
nsmgr.AddNamespace( "myNS",
"http://www.orange.com/schemas/imaging/cyanblue/dev/1.0" );

expr.SetContext(nsmgr);
XPathNodeIterator iter = navigator.Select( xpathQuery );

while ( iter.MoveNext() )
{
XPathNavigator innerNav = iter.Current.Clone();
innerNav.MoveToFirstChild();
retVal = innerNav.Value;
}
..

As I stated earlier, "iter" has a count of 0 - has no nodes in it. Is
there somethign I ought to be doingthat I am not doing? What could be
the problem?

Thanks for your help.

orange

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[Martin Honnen]

orange wrote:

I have been trying to get data from an xml file with a namespace. I
have followed the example in the MSDN, but I get no data in t he
XPathNodeIterator, but the file has the data I am trying to extract.

..
XPathNavigator navigator = xmlDoc.CreateNavigator();
// xpathQuery = "/ProductInformation/ProductNumber"
XPathExpression expr = navigator.Compile( xpathQuery );
expr = navigator.Compile( xpathQuery );

XmlNamespaceManager nsmgr = new XmlNamespaceManager( navigator.NameTable
);
nsmgr.AddNamespace( "myNS",
"http://www.orange.com/schemas/imaging/cyanblue/dev/1.0" );

expr.SetContext(nsmgr);
XPathNodeIterator iter = navigator.Select( xpathQuery );

Make sure your XPath expression makes use of the prefix(es) bound to
namespace URI e.g.
navigator.Select("myNS:element1/myNS:element2")

--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

[swapna guddanti [MSFT]]

hi,
there are a couple of things missing.
1.the xpathQuery declaration statement needs to be uncommented.
2.the xpathQuery needs to have the prefix , if the input xml document has
the prefix for example the xpath needs to be
"myNS:ProductInformation/myNS:ProductNumber" if ProductInformation is the
root element and the myNS prefix is present in the xml dcocument.

3. the statement XPathNodeIterator iter = navigator.Select( xpathQuery );
needs to have the namespace resolver in it like
XPathNodeIterator iter = navigator.Select( xpathQuery, nsmgr );
hope this helps,
swapna


"orange" <or****@devdex.com> wrote in message
news:uT**************@TK2MSFTNGP14.phx.gbl...

Hello,

I have been trying to get data from an xml file with a namespace. I
have followed the example in the MSDN, but I get no data in t he
XPathNodeIterator, but the file has the data I am trying to extract.

..
XPathNavigator navigator = xmlDoc.CreateNavigator();
// xpathQuery = "/ProductInformation/ProductNumber"
XPathExpression expr = navigator.Compile( xpathQuery );
expr = navigator.Compile( xpathQuery );

XmlNamespaceManager nsmgr = new XmlNamespaceManager( navigator.NameTable
);
nsmgr.AddNamespace( "myNS",
"http://www.orange.com/schemas/imaging/cyanblue/dev/1.0" );

expr.SetContext(nsmgr);
XPathNodeIterator iter = navigator.Select( xpathQuery );

while ( iter.MoveNext() )
{
XPathNavigator innerNav = iter.Current.Clone();
innerNav.MoveToFirstChild();
retVal = innerNav.Value;
}
.

As I stated earlier, "iter" has a count of 0 - has no nodes in it. Is
there somethign I ought to be doingthat I am not doing? What could be
the problem?

Thanks for your help.

orange

*** Sent via Developersdex http://www.developersdex.com ***