Newbie question

I have this XML

<?xml version="1.0" encoding="utf-8"?>
<PORMessage key="new" j:effectiveDate="2007-05-21"
xmlns:j="http://www.xxx.com/xxxx/3.0.3"
xmlns="http://www.xxx.com">
<ActivityID>
<ID>12345</ID>
</ActivityID>
</PORMessage>

=================== END =====

Then my C# code is:

xmlDoc.LoadXml(xmlMsg);
XmlNamespaceManager nsmgr = new XmlNamespaceManager(xmlDoc.NameTable);
nsmgr.AddNamespace("j", "http://www.xxx.com/xxxx/3.0.3");

XmlNode porNode = xmlDoc.SelectSingleNode("//PORMessage", nsmgr);

Question: porNode always return null. I have some similar program that
works. I don't know why this one does not. If I take out the 3rd line on the
xml, it return the right node.

How do I make it work and an explanation would be appreciated. Thanks

Phil Hunt wrote:

I have this XML

?xml version="1.0" encoding="utf-8"?
PORMessage key="new" j:effectiveDate="2007-05-21"
xmlns:j="http://www.xxx.com/xxxx/3.0.3"
xmlns="http://www.xxx.com"
ActivityID
ID>12345</ID
/ActivityID
/PORMessage

=================== END =====

Then my C# code is:

xmlDoc.LoadXml(xmlMsg);
XmlNamespaceManager nsmgr = new XmlNamespaceManager(xmlDoc.NameTable);
nsmgr.AddNamespace("j", "http://www.xxx.com/xxxx/3.0.3");

nsmgr.AddNamespace("df", "http://www.xxx.com/");

XmlNode porNode = xmlDoc.SelectSingleNode("//PORMessage", nsmgr);

XmlNode porNode = xmlDoc.SelectSingleNode("//df:PORMessage", nsmgr);

The default namespace declaration (xmlns="http://www.xxx.com/") means
that the elements are in the namespace http://www.xxx.com/. With XPath
1.0 to select elements in a namespace you need to bind a prefix (e.g.
df) to the namespace URI and use the prefix to qualify element names in
your XPath expression.


--

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

thanks. that's it.


"Martin Honnen" <mahotrash (AT) yahoo (DOT) de> wrote

Phil Hunt wrote:
I have this XML

?xml version="1.0" encoding="utf-8"?
PORMessage key="new" j:effectiveDate="2007-05-21"
xmlns:j="http://www.xxx.com/xxxx/3.0.3"
xmlns="http://www.xxx.com"
ActivityID
ID>12345</ID
/ActivityID
/PORMessage

=================== END =====

Then my C# code is:

xmlDoc.LoadXml(xmlMsg);
XmlNamespaceManager nsmgr = new XmlNamespaceManager(xmlDoc.NameTable);
nsmgr.AddNamespace("j", "http://www.xxx.com/xxxx/3.0.3");

nsmgr.AddNamespace("df", "http://www.xxx.com/");

XmlNode porNode = xmlDoc.SelectSingleNode("//PORMessage", nsmgr);

XmlNode porNode = xmlDoc.SelectSingleNode("//df:PORMessage", nsmgr);

The default namespace declaration (xmlns="http://www.xxx.com/") means that
the elements are in the namespace http://www.xxx.com/. With XPath 1.0 to
select elements in a namespace you need to bind a prefix (e.g. df) to the
namespace URI and use the prefix to qualify element names in your XPath
expression.


--

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