passing node set through document function to extension object

[Oleksandr Brovko]

Code sample below demonstrates following:
We have sample extension object with 2 methods
TestMethod - takes XPathNodeIterator as a parameter
TestMethod2 - takes string as a parameter
also we have CustomXmlResolver, stylesheet takes <XML>SourceDoc</XML> as
source XML document
also sylesheet retreives <XML>CustomXmlResolverData</XML> XML document
through the document function and CustomXmlResolver
now we pass $externalDoc/XML node set to both, TestMothod and TestMethod2
I expect output like "CustomXmlResolverData_____CustomXmlResolverDa ta" but
it outputs "SourceDoc_CustomXmlResolverData" !!!
Source document was passed to TestMethod instead of node set returned by the
document function!

I tested this on .Net Framework 1.1.4322 SP1
--- Source ---
using System;
using System.Text;
using System.IO;
using System.Xml.XPath;
using System.Xml.Xsl;

namespace TestApp
{
public class MainClass
{
public MainClass()
{
}
[STAThread]
static void Main(string[] args)
{
XsltArgumentList arg = new XsltArgumentList();
arg.AddExtensionObject("testuri", new SampleExtensionObject());
XslTransform t = new XslTransform();

XPathDocument styleSheet = new XPathDocument(new StringReader(
"<xsl:stylesheet version=\"1.0\"
xmlns:xsl=\"http://www.w3.org/1999/XSL/Transform\" xmlns:eo=\"testuri\">" +
"<xsl:variable name=\"externalDoc\" select=\"document('uriuriuri')\"/>" +
"<xsl:template match=\"/\">" +
"<xsl:value-of select=\"eo:TestMethod($externalDoc/XML)\"/>___" +
"<xsl:value-of select=\"eo:TestMethod2($externalDoc/XML)\"/>" +
"</xsl:template>" +
"</xsl:stylesheet>"

));
t.Load(styleSheet.CreateNavigator(), null,
typeof(MainClass).Assembly.Evidence);

XPathDocument srcDoc = new XPathDocument(new
StringReader("<XML>SourceDoc</XML>"));

t.Transform(srcDoc, arg, Console.Out, new CustomXmlResolver());

}
}
class CustomXmlResolver : System.Xml.XmlResolver
{
public override object GetEntity(Uri absoluteUri, string role, Type
ofObjectToReturn)
{
return new
MemoryStream(Encoding.Default.GetBytes("<XML>Custo mXmlResolverData</XML>"));
}
public override System.Net.ICredentials Credentials
{
set
{
}
}
}
class SampleExtensionObject
{
public string TestMethod(XPathNodeIterator it)
{
XPathNavigator nav = it.Current;
return nav.Value;
}
public string TestMethod2(string s)
{
return s;
}

}
}

[Oleg Tkachenko [MVP]]

Oleksandr Brovko wrote:

public string TestMethod(XPathNodeIterator it)
{
XPathNavigator nav = it.Current;
return nav.Value;
}

As always with XPathNodeIterator class you have to call MoveNext()
method before accessing Current property:

public string TestMethod(XPathNodeIterator it)
{
if (it.MoveNext()) {
XPathNavigator nav = it.Current;
return nav.Value;
}
else {
//Empty nodeset passed
return "";
}
}
--
Oleg Tkachenko [XML MVP, MCP]
http://blog.tkachenko.com

[Oleksandr Brovko]

"Oleg Tkachenko [MVP]" <oleg@NO!SPAM!PLEASEtkachenko.com> wrote in message
news:eY**************@tk2msftngp13.phx.gbl...

Oleksandr Brovko wrote:

As always with XPathNodeIterator class you have to call MoveNext() method
before accessing Current property:

Thank you, this was the case. I would have read MSDN closely :)
----- MSDN: ----
XPathNodeIterator.Current Property [C#]
Note The XPathNodeIterator is initially positioned on the context node from
which the node set was selected. MoveNext must be called to move the
XPathNodeIterator to the first node in the selected set.