The following transformation puzzles me when trying to transform XML to XML.
I get an exception "THE EXPRESSION PASSED TO THIS METHOD SHOULD RESULT IN A
NODESET" at the last line "xmlDoc.Load(xr )" when I run the code.
I previously tried it all without a parameter and hard-coded the value into
the 'apply-templates' statement and the tranform produced
the result that I expected but when I inset the parameter I get the
exception.
I would appreciate it if someone could look over the code and identify which
part of the code causes the fault
I use VB.NET 2003 and .NET 1.1
cheers,
Craig
------------------ regs.xml ------------
<?xml version="1.0" ?>
<?xml-stylesheet type="text/xsl" href="regs.xslt "?>
<AllCtls>
<Ctl>
<cl>2</cl>
<ol>AAAAAAAAA </ol>
</Ctl>
<Ctl>
<cl>6</cl>
<ol>BBBBBBBBB </ol>
</Ctl>
<Ctl>
<cl>3</cl>
<ol>CCCCCCCCC </ol>
</Ctl>
<Ctl>
<cl>6</cl>
<ol>DDDDDDDDD </ol>
</Ctl>
</AllCtls>
------------ regs.xslt -------------------
<?xml version="1.0" encoding="UTF-8" ?>
<xsl:styleshe et version="1.0"
xmlns:xsl="http ://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes"/>
<xsl:param name='myFilter' />
<xsl:template match="/">
<AllCtls>
<xsl:apply-templates select='$myFilt er' />
</AllCtls>
</xsl:template>
<xsl:template match="Ctl">
<xsl:copy-of select="." />
</xsl:template>
</xsl:stylesheet>
----------- VB.Net code ----------------
Dim xmlDoc As New XmlDocument
xmlDoc.Load("re gs.xml")
Dim xslt As XslTransform = New XslTransform
xslt.Load("regs .xslt")
Dim xslArg As XsltArgumentLis t = New XsltArgumentLis t
Dim str As String = "/AllCtls/Ctl[cl='6']"
xslArg.AddParam ("myFilter", "", str)
Dim res As XmlResolver
Dim nav As XPathNavigator = xmlDoc.CreateNa vigator()
Dim xr As XmlReader = xslt.Transform( nav, xslArg, res)
Dim xmlDoc As New XmlDocument
xmlDoc.Load(xr)
------------------------------------------------------------ 2 4033
Craig Petrie wrote: Dim xmlDoc As New XmlDocument xmlDoc.Load("re gs.xml")
Dim xslt As XslTransform = New XslTransform xslt.Load("regs .xslt")
Dim xslArg As XsltArgumentLis t = New XsltArgumentLis t
Dim str As String = "/AllCtls/Ctl[cl='6']" xslArg.AddParam ("myFilter", "", str)
Hehe, nice one. Can you pass fragment of C# source code to a method
call? I don't think so.
What you are passing here is plain string. There is no such thing as
"string-which-is-actually-XPath-expression" type in XSLT.
Instead select nodes you want to pass and just pass them. Something like
XPathNavigator nav = xmlDoc.CreateNa vigator();
xslArg.AddParam ("myFilter", "", nav.Select("/AllCtls/Ctl[cl='6']"));
--
Oleg Tkachenko [XML MVP, XmlInsider] http://blog.tkachenko.com
Many thanks Oleg - much appreciated
I am new to xsl and its good to get advice from experts such as yourself.
I tried your solution and it worked very well - many thanks.
cheers,
Craig
"Oleg Tkachenko [MVP]" <oleg@NO!SPAM!P LEASEtkachenko. com> wrote in message
news:OV******** ********@TK2MSF TNGP09.phx.gbl. .. Craig Petrie wrote:
Dim xmlDoc As New XmlDocument xmlDoc.Load("re gs.xml")
Dim xslt As XslTransform = New XslTransform xslt.Load("regs .xslt")
Dim xslArg As XsltArgumentLis t = New XsltArgumentLis t
Dim str As String = "/AllCtls/Ctl[cl='6']" xslArg.AddParam ("myFilter", "", str)
Hehe, nice one. Can you pass fragment of C# source code to a method call? I don't think so. What you are passing here is plain string. There is no such thing as "string-which-is-actually-XPath-expression" type in XSLT. Instead select nodes you want to pass and just pass them. Something like
XPathNavigator nav = xmlDoc.CreateNa vigator(); xslArg.AddParam ("myFilter", "", nav.Select("/AllCtls/Ctl[cl='6']"));
-- Oleg Tkachenko [XML MVP, XmlInsider] http://blog.tkachenko.com This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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