RE: Bug in MSXML / XML Parser .Net

From: Michael (Michael_at_discussions.microsoft.com)
Date: 10/06/04 

Date: Wed, 6 Oct 2004 05:29:03 -0700

I have figured out that this is a parser issue.
My IE is using version 3.0 set as default in registry.

http://www.perfectxml.com/articles/xml/XSLTInMSXML.asp

There must be a way to set this in a namespace so, IE does understand what
processor to use.

/Michael

"Michael" wrote:

> Hi,
>
> I have a problem parsing XML file using XSLT style*** by using :
>
> using System.Xml;
> using System.Xml.XPath;
> using System.Xml.Xsl;
>
> // load Xsl style***
> XslTransform myXslTrans = new XslTransform() ;
> myXslTrans.Load(Server.MapPath("style***.xslt"));
>
> // load the Xml doc
> XPathDocument myXPathDoc = new XPathDocument(Server.MapPath("file.xml"));
>
> // write the transformed result
> XmlTextWriter writer = new XmlTextWriter(Server.MapPath("result.xml"), null);
>
> // do the actual transform of Xml
> // pass XmlResolver to Transform() method
> myXslTrans.Transform(myXPathDoc, null, writer, null);
> writer.Close();
>
>
> XML file
>
> <?xml version="1.0" encoding="utf-8"?>
>
> <Documents>
> <Document chapter="1" title="title 1" href="file1.xml" filter="">
> <Article title="1.1" info="sub" filter="food"/>
> <Article title="1.2" info="main" filter="food"/>
> </Document>
> <Document chapter="2" title="title 2" href="file2.xml" filter="drink">
> <Article title="2.1" info="sub" filter="drink"/>
> <Article title="2.2" info="main" filter="food"/>
> </Document>
> </Documents>
>
>
> XSLT style***
>
> <?xml version='1.0' encoding='UTF-8'?>
>
> <xsl:style*** version="1.0"
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
>
> <!-- using muenchian method group by an attribute by asigning a unique
> key to each element -->
>
> <xsl:output method="html" version="1.0" encoding="UTF-8" indent="yes"/>
>
> <!-- xsl:key name="by-proctype" match="Doc" use="@proceduretype"/ -->
>
> <!-- define info key -->
> <xsl:key name="by-info" match="Article" use="@info"/>
>
> <!-- put the filter string in a global parameter -->
> <xsl:param name="filter" select="'food'"/>
>
> <xsl:template match="Documents"><!-- @filter='' will be true if it is
> there and empty or if it is not there at all) -->
>
> <documents>
> <xsl:for-each select="Document[@filter='' or
> @filter=$filter]/Article[count(.|key('by-info',@info)[@filter='' or
> @filter=$filter][1])=1]">
> <document name="{@info}"><xsl:copy-of
> select="key('by-info',@info)[@filter=$filter]"/></document>
> </xsl:for-each>
> </documents>
> </xsl:template>
>
> </xsl:style***>
>
>
> Exception Details:
>
> System.NullReferenceException: Object reference not set to an instance of an
> object."
>
> Stack Trace:
>
> [NullReferenceException: Object reference not set to an instance of an
> object.]
> System.Xml.XPath.FilterQuery.SetXsltContext(XsltContext input)
> System.Xml.XPath.FilterQuery.SetXsltContext(XsltContext input)
> System.Xml.XPath.MergeFilterQuery.SetXsltContext(XsltContext input)
> System.Xml.XPath.OrQuery.SetXsltContext(XsltContext context)
> System.Xml.XPath.MethodOperand.SetXsltContext(XsltContext context)
> System.Xml.XPath.LogicalExpr.SetXsltContext(XsltContext context)
> System.Xml.XPath.FilterQuery.SetXsltContext(XsltContext input)
> System.Xml.XPath.MergeFilterQuery.SetXsltContext(XsltContext input)
> System.Xml.XPath.CompiledXpathExpr.SetContext(XmlNamespaceManager
> nsManager)
> System.Xml.Xsl.Processor.GetCompiledQuery(Int32 key)
> System.Xml.Xsl.Processor.StartQuery(XPathNavigator context, Int32 key)
> System.Xml.Xsl.ForEachAction.Execute(Processor processor, ActionFrame
> frame)
> System.Xml.Xsl.ActionFrame.Execute(Processor processor)
> System.Xml.Xsl.Processor.Execute()
> System.Xml.Xsl.XslTransform.Transform(XPathNavigator input,
> XsltArgumentList args, XmlWriter output, XmlResolver resolver)
> System.Xml.Xsl.XslTransform.Transform(IXPathNavigable input,
> XsltArgumentList args, XmlWriter output, XmlResolver resolver)
> com.pop.mm_main_v2.Page_Load(Object sender, EventArgs e) in
> c:\inetpub\wwwroot\file\index.aspx.cs:61
> .....
>
>
> When I use XMLSpy to parse the XML using MSXML 4 processor it works perfect.
> Saxon works perfectly as well. But when I try to parse it trough C#, I get
> the error above.
>
> It looks like I don't use MSXML 4 at all.
>
> How do I make sure that MSXML 4 is used when I parse?
>
>
>
> Thank you,
>
> -Mike