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 XPathNodeIterat or as a parameter
TestMethod2 - takes string as a parameter
also we have CustomXmlResolv er, stylesheet takes <XML>SourceDo c</XML> as
source XML document
also sylesheet retreives <XML>CustomXmlR esolverData</XML> XML document
through the document function and CustomXmlResolv er
now we pass $externalDoc/XML node set to both, TestMothod and TestMethod2
I expect output like "CustomXmlResol verData_____Cus tomXmlResolverD ata" but
it outputs "SourceDoc_Cust omXmlResolverDa ta" !!!
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.XPat h;
using System.Xml.Xsl;

namespace TestApp
{
public class MainClass
{
public MainClass()
{
}
[STAThread]
static void Main(string[] args)
{
XsltArgumentLis t arg = new XsltArgumentLis t();
arg.AddExtensio nObject("testur i", new SampleExtension Object());
XslTransform t = new XslTransform();

XPathDocument styleSheet = new XPathDocument(n ew StringReader(
"<xsl:styleshee t version=\"1.0\"
xmlns:xsl=\"htt p://www.w3.org/1999/XSL/Transform\" xmlns:eo=\"test uri\">" +
"<xsl:varia ble name=\"external Doc\" select=\"docume nt('uriuriuri') \"/>" +
"<xsl:templ ate match=\"/\">" +
"<xsl:value-of select=\"eo:Tes tMethod($extern alDoc/XML)\"/>___" +
"<xsl:value-of select=\"eo:Tes tMethod2($exter nalDoc/XML)\"/>" +
"</xsl:template>" +
"</xsl:stylesheet> "

));
t.Load(styleShe et.CreateNaviga tor(), null,
typeof(MainClas s).Assembly.Evi dence);

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

t.Transform(src Doc, arg, Console.Out, new CustomXmlResolv er());

}
}
class CustomXmlResolv er : System.Xml.XmlR esolver
{
public override object GetEntity(Uri absoluteUri, string role, Type
ofObjectToRetur n)
{
return new
MemoryStream(En coding.Default. GetBytes("<XML> CustomXmlResolv erData</XML>"));
}
public override System.Net.ICre dentials Credentials
{
set
{
}
}
}
class SampleExtension Object
{
public string TestMethod(XPat hNodeIterator it)
{
XPathNavigator nav = it.Current;
return nav.Value;
}
public string TestMethod2(str ing s)
{
return s;
}

}
}

[Oleg Tkachenko [MVP]]

Oleksandr Brovko wrote:

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

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

public string TestMethod(XPat hNodeIterator 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!P LEASEtkachenko. com> wrote in message
news:eY******** ******@tk2msftn gp13.phx.gbl...

Oleksandr Brovko wrote:

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

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