XPath + SelectSingleNode

[muscha]

Hi All,

I have this weird problem. I have an xml document and tried to do an XPath
query to it. If I use the SelectSingleNode method it throws an exception but
it works with SelectNodes method. Is this a known problem with XPath and
SelectSingleNode?

Code snippet:

<snip>
XmlDocument xml= new XmlDocument();
xml.LoadXml(xmlString);
XmlNamespaceManager namespaceManager =
new XmlNamespaceManager(xml.NameTable);

namespaceManager.AddNamespace("defns", defns);

// return xml.DocumentElement.SelectSingleNode(xpath, namespaceManager);
<-- does not work
return xml.DocumentElement.SelectNodes(xpath, namespaceManager); // WORKS!

</snip>

so ... this is odd, does anyone has any explanation?
thanks,

/m

[Oleg Tkachenko]

muscha wrote:

I have this weird problem. I have an xml document and tried to do an XPath
query to it. If I use the SelectSingleNode method it throws an exception but
it works with SelectNodes method. Is this a known problem with XPath and
SelectSingleNode?

That's really weird, because SelectSingleNode is in fact only a wrapper around
SelectNodes, which returns only first selected node.
Provide more information please - what is your XML and XPath expression.
--
Oleg Tkachenko
http://www.tkachenko.com/blog
Multiconn Technologies, Israel

[Daniel Cazzulino]

I'd say the problem is in the method definition. Maybe it's defined to
return an XmlNodeList and when you do the return from SelectSingleNode it
doesn't work.... just an idea...

--
.../d:cazz
Daniel Cazzulino
DEVerest - Lagash
Tel [phone]
www.deverest.com.ar
www.lagash.com
dotnetopensrc.sourceforge.net

Coauthor of:
Beginning C# Web Applications with Visual Studio .NET
Beginning Web Programming using VB.NET and Visual Studio .NET
Professional ASP.NET Server Controls: Building Custom Controls with C#
ASP.NET Components Toolkit

"He who is good for making excuses, is seldom good for anything else."

"muscha" <mu****@no.spam.net> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl...

Hi All,

I have this weird problem. I have an xml document and tried to do an XPath
query to it. If I use the SelectSingleNode method it throws an exception but it works with SelectNodes method. Is this a known problem with XPath and
SelectSingleNode?

Code snippet:

<snip>
XmlDocument xml= new XmlDocument();
xml.LoadXml(xmlString);
XmlNamespaceManager namespaceManager =
new XmlNamespaceManager(xml.NameTable);

namespaceManager.AddNamespace("defns", defns);

// return xml.DocumentElement.SelectSingleNode(xpath, namespaceManager);
<-- does not work
return xml.DocumentElement.SelectNodes(xpath, namespaceManager); // WORKS!

</snip>

so ... this is odd, does anyone has any explanation?
thanks,

/m

[muscha]

> > I have this weird problem. I have an xml document and tried to do an
XPath

query to it. If I use the SelectSingleNode method it throws an exception but it works with SelectNodes method. Is this a known problem with XPath and
SelectSingleNode?
That's really weird, because SelectSingleNode is in fact only a wrapper

around SelectNodes, which returns only first selected node.
Provide more information please - what is your XML and XPath expression.

You're right. It was a problem on my XPath. Found that it works now for
SelectSingleNode and even if I pass XPath that returns multiple nodes it
will return the first occurance of the node.

thanks

/m