Merging two XPathDocuments using XmlCompiledTransform

Answer 1

You need to define a parameter in your stylesheet and then use that parameter. Here is a simple example, the stylesheet looks as follows:

<xsl:stylesheet
  version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:docs="http://example.com/2010/docs"
  exclude-result-prefixes="docs"
>
  <xsl:param name="docs:doc1" select="/.."/>

  <xsl:template match="/">
    <xsl:apply-templates select="$docs:doc1/node()"/>
  </xsl:template>

  <xsl:template match="root">
    <ul>
      <xsl:apply-templates/>
    </ul>
  </xsl:template>

  <xsl:template match="foo">
    <li>
      <xsl:apply-templates/>
    </li>
  </xsl:template>
</xsl:stylesheet>

The C# code looks as follows:

    string xml = "<root><foo>1</foo><foo>2</foo></root>";
    XPathDocument doc = new XPathDocument(new StringReader(xml));

    XslCompiledTransform proc = new XslCompiledTransform();
    proc.Load(@"..\..\XSLTFile1.xslt");

    XsltArgumentList xsltArgs = new XsltArgumentList();
    xsltArgs.AddParam("doc1", "http://example.com/2010/docs", doc.CreateNavigator());

    proc.Transform(XmlReader.Create(new StringReader("<dummy/>")), xsltArgs, Console.Out);

This is a console application which for simplicity writes to Console.Out but you can of course use other outputs the Transform method allows.

That example then writes <ul><li>1</li><li>2</li></ul> so the input parameter has been processed.

So that should show you how to pass in a parameter that XslCompiledTransform sees as a node-set you can process with XSLT.

As for writing a stylesheet that merges two documents, please post two input samples and the corresponding result sample you want to create if you have problems writing that XSLT.