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Editorial Team
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Asked: 2026-05-23T15:24:23+00:00

I have an xml being returned by an extension method. Can some please help

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I have an xml being returned by an extension method. Can some please help me to use <xsl:for-each> on this xml.

public class CustomObj
{
    //function that gets called from XSLT
    public XPathNodeIterator GetResultTable()
    {
        DataTable table = new DataTable("Table1");

        table.Columns.Add("SourceCity");
        table.Columns.Add("DestinationCity");
        table.Columns.Add("Fare");

        table.Rows.Add(new object[] { "New York", "Las Vegas", "100" });
        table.Rows.Add(new object[] { "New York", "London", "200" });
        table.Rows.Add(new object[] { "New York", "New Delhi", "250" });

        StringWriter writer = new StringWriter();
        table.WriteXml(writer);

        XmlDocument doc = new XmlDocument();
        XmlElement root = doc.CreateElement("Root");
        root.InnerXml = writer.ToString();
        doc.AppendChild(root);

        return doc.CreateNavigator().Select("root");
    }
}

I want to iterate over this xml. Some one please help. I am new to XSLT and would appreciate if you can provide example on the given xml itself.

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1 Answer

  1. Editorial Team

    There are two things to note:

    1. It is much more natural to apply the transformation to the result of invoking the method GetResultTable() than to get its result via an extension function.

    2. As written the GetResultTable() method doesn’t return any node at all: in the statement

    —

       return doc.CreateNavigator().Select("root");

    the Select() method doesn’t select anything as there is no root element in doc. The element named Root isn’t selected, because XML and XPath are case-sensitive.

    Another observation is that it isn’t necessary at all to use xsl:for-each within an XSLT transformation — this is considered not a good practice in most cases.

    Having said that, here is the complete code for what this question asks for:

    namespace TestXml
{
    using System;
    using System.Data;
    using System.IO;
    using System.Xml;
    using System.Xml.XPath;
    using System.Xml.Xsl;

    class Program
    {
        static void Main(string[] args)
        {
            CustomObj co = new CustomObj();
            XPathNodeIterator xpni = co.GetResultTable();

            XslCompiledTransform xslt = new XslCompiledTransform(true);
            xslt.Load(@"..\..\My.xslt");

            XsltArgumentList xargs = new XsltArgumentList();
            xargs.AddExtensionObject("my:extension", co);

            XmlDocument fakeDoc = new XmlDocument();
            fakeDoc.LoadXml("<t/>");

            StringWriter sw = new StringWriter();

            xslt.Transform(fakeDoc.CreateNavigator(), xargs, sw);

            string result = sw.ToString();

            Console.Write(result);
        }
    }

    public class CustomObj
    {    //function that gets called from XSLT    
        public XPathNodeIterator GetResultTable()    
        {        
            DataTable table = new DataTable("Table1");        
            table.Columns.Add("SourceCity");        
            table.Columns.Add("DestinationCity");        
            table.Columns.Add("Fare");        
            table.Rows.Add(new object[] { "New York", "Las Vegas", "100" });        
            table.Rows.Add(new object[] { "New York", "London", "200" });        
            table.Rows.Add(new object[] { "New York", "New Delhi", "250" });        
            StringWriter writer = new StringWriter();        
            table.WriteXml(writer);        
            XmlDocument doc = new XmlDocument();        
            XmlElement root = doc.CreateElement("Root");        
            root.InnerXml = writer.ToString();        
            doc.AppendChild(root);        
            return doc.CreateNavigator().Select("Root");    
        }
    }
}

    and the file My.xslt:

    <xsl:stylesheet version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
 xmlns:my="my:extension"
 exclude-result-prefixes="my">
  <xsl:output omit-xml-declaration="yes" indent="yes"/>

  <xsl:template match="/">
    <html>
      <table border="1">
        <tr>
          <td>Source</td>
          <td>Destination</td>
          <td>Fare</td>
        </tr>
        <xsl:apply-templates select="my:GetResultTable()/*/Table1"/>
      </table>
    </html>
  </xsl:template>

  <xsl:template match="Table1">
    <tr>
      <xsl:apply-templates/>
    </tr>
  </xsl:template>

  <xsl:template match="Table1/*">
    <td>
      <xsl:apply-templates/>
    </td>
  </xsl:template>
</xsl:stylesheet>

    When the application is executed, the wanted, correct result is produced:

    <html>
  <table border="1">
    <tr>
      <td>Source</td>
      <td>Destination</td>
      <td>Fare</td>
    </tr>
    <tr>
    <td>New York</td>
    <td>Las Vegas</td>
    <td>100</td>
  </tr>
    <tr>
    <td>New York</td>
    <td>London</td>
    <td>200</td>
  </tr>
    <tr>
    <td>New York</td>
    <td>New Delhi</td>
    <td>250</td>
  </tr>
  </table>
</html>
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