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 SelectSingleNod e method it throws an exception but
it works with SelectNodes method. Is this a known problem with XPath and
SelectSingleNod e?

Code snippet:

<snip>
XmlDocument xml= new XmlDocument();
xml.LoadXml(xml String);


XmlNamespaceMan ager namespaceManage r =
new XmlNamespaceMan ager(xml.NameTa ble);

namespaceManage r.AddNamespace( "defns", defns);

// return xml.DocumentEle ment.SelectSing leNode(xpath, namespaceManage r);
<-- does not work
return xml.DocumentEle ment.SelectNode s(xpath, namespaceManage r); // WORKS!

</snip>

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


thanks,

/m

[Oleg Tkachenko]

Re: XPath + SelectSingleNod e

muscha wrote:
[color=blue]
> I have this weird problem. I have an xml document and tried to do an XPath
> query to it. If I use the SelectSingleNod e method it throws an exception but
> it works with SelectNodes method. Is this a known problem with XPath and
> SelectSingleNod e?[/color]

That's really weird, because SelectSingleNod e 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]

Re: XPath + SelectSingleNod e

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 SelectSingleNod e it
doesn't work.... just an idea...

--
.../d:cazz


Daniel Cazzulino
DEVerest - Lagash
Tel +54 (0) 11 4247 7396

https://www.deverest.com.ar

https://www.lagash.com

dotnetopensrc.s ourceforge.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" <muscha@no.spam .net> wrote in message
news:%23W4$cqVg DHA.2084@TK2MSF TNGP10.phx.gbl. ..[color=blue]
> 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 SelectSingleNod e method it throws an exception[/color]
but[color=blue]
> it works with SelectNodes method. Is this a known problem with XPath and
> SelectSingleNod e?
>
> Code snippet:
>
> <snip>
> XmlDocument xml= new XmlDocument();
> xml.LoadXml(xml String);
>
>
> XmlNamespaceMan ager namespaceManage r =
> new XmlNamespaceMan ager(xml.NameTa ble);
>
> namespaceManage r.AddNamespace( "defns", defns);
>
> // return xml.DocumentEle ment.SelectSing leNode(xpath, namespaceManage r);
> <-- does not work
> return xml.DocumentEle ment.SelectNode s(xpath, namespaceManage r); // WORKS!
>
> </snip>
>
> so ... this is odd, does anyone has any explanation?
>
>
> thanks,
>
> /m
>
>[/color]

[muscha]

Re: XPath + SelectSingleNod e

> > I have this weird problem. I have an xml document and tried to do an
XPath[color=blue][color=green]
> > query to it. If I use the SelectSingleNod e method it throws an exception[/color][/color]
but[color=blue][color=green]
> > it works with SelectNodes method. Is this a known problem with XPath and
> > SelectSingleNod e?[/color]
>
> That's really weird, because SelectSingleNod e is in fact only a wrapper[/color]
around[color=blue]
> SelectNodes, which returns only first selected node.
> Provide more information please - what is your XML and XPath expression.[/color]

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

thanks

/m