Hi,
I have a problem parsing XML file using XSLT stylesheet by using :
using System.Xml;
using System.Xml.XPath;
using System.Xml.Xsl;
// load Xsl stylesheet
XslTransform myXslTrans = new XslTransform() ;
myXslTrans.Load(Server.MapPath("stylesheet.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 stylesheet
<?xml version='1.0' encoding='UTF-8'?>
<xsl:stylesheet 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:stylesheet>
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(XsltCo ntext input)
System.Xml.XPath.FilterQuery.SetXsltContext(XsltCo ntext input)
System.Xml.XPath.MergeFilterQuery.SetXsltContext(X sltContext input)
System.Xml.XPath.OrQuery.SetXsltContext(XsltContex t context)
System.Xml.XPath.MethodOperand.SetXsltContext(Xslt Context context)
System.Xml.XPath.LogicalExpr.SetXsltContext(XsltCo ntext context)
System.Xml.XPath.FilterQuery.SetXsltContext(XsltCo ntext input)
System.Xml.XPath.MergeFilterQuery.SetXsltContext(X sltContext input)
System.Xml.XPath.CompiledXpathExpr.SetContext(XmlN amespaceManager
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(XPathNavigat or input,
XsltArgumentList args, XmlWriter output, XmlResolver resolver)
System.Xml.Xsl.XslTransform.Transform(IXPathNaviga ble 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
