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POWhat am I doing wrong here, having issues with XSLT using C#
 

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  1. POWhat am I doing wrong here, having issues with XSLT using C#
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    <p>Please take a look at the following code, as I get the error at this line:</p> <pre><code>xslt.Transform(mydoc.CreateReader(), writer); </code></pre> <p>Error:</p> <p>Step into: Stepping over non-user code 'System.Xml.Linq.XNode.CreateReader' A first chance exception of type 'System.NullReferenceException' occurred in System.Data.SqlXml.dll</p> <p>((System.NullReferenceException)(ex))</p> <pre><code>PromotionsDataContext db = new PromotionsDataContext(); //XmlDocument myxml; XElement Categories = new XElement("Promotions", from b in db.GetPromotions() select new XElement("Promotion", new XElement("Category", b.CategoryName), new XElement("Client", b.ClientName), new XElement("Title", b.Title))); XDocument mydoc = new XDocument(); mydoc.Add(Categories); try { XDocument newTree = new XDocument(); XmlWriterSettings settings = new XmlWriterSettings(); settings.OmitXmlDeclaration = true; settings.ConformanceLevel = ConformanceLevel.Fragment; settings.CloseOutput = false; //using (XmlWriter writer = newTree.CreateWriter()) using (XmlWriter writer = XmlWriter.Create(newTree.CreateWriter(), settings)) { // Load the style sheet. XslCompiledTransform xslt = new XslCompiledTransform(); xslt.Load(XmlReader.Create(new FileStream(@"C:\1\TransList.xslt", System.IO.FileMode.Open))); // Execute the transform and output the results to a writer. xslt.Transform(mydoc.CreateReader(), writer); } Console.WriteLine(newTree); } catch (Exception ex) { Console.Write(ex); } </code></pre> <p>Here is the XSLT:</p> <pre><code>&lt;xsl:stylesheet version='1.0' xmlns:xsl='http://www.w3.org/1999/XSL/Transform'&gt; &lt;xsl:output method='xml' /&gt; &lt;xsl:key name='categories' match='Category' use='.' /&gt; &lt;xsl:template match='/'&gt; &lt;xsl:for-each select="/Promotions/Promotion/Category[ generate-id(.) = generate-id(key('categories', .)[1]) ]"&gt; &lt;xsl:variable name='cname' select='.' /&gt; &lt;Category title='{.}'&gt; &lt;xsl:for-each select='/Promotions/Promotion[Category=$cname]'&gt; &lt;Title&gt; &lt;xsl:value-of select='Title' /&gt; &lt;/Title&gt; &lt;/xsl:for-each&gt; &lt;/Category&gt; &lt;/xsl:for-each&gt; &lt;/xsl:template&gt; &lt;/xsl:stylesheet&gt; </code></pre> <p>The error:</p> <p>System.NullReferenceException: Object reference not set to an instance of an object. at System.Xml.Xsl.Runtime.XmlMergeSequenceWriter.StartTree(XPathNodeType rootType, IXmlNamespaceResolver nsResolver, XmlNameTable nameTable) at System.Xml.Xsl.Runtime.XmlQueryOutput.StartTree(XPathNodeType rootType) at System.Xml.Xsl.Runtime.XmlQueryOutput.WriteStartRoot() at Root(XmlQueryRuntime {urn:schemas-microsoft-com:xslt-debug}runtime) at Execute(XmlQueryRuntime {urn:schemas-microsoft-com:xslt-debug}runtime) at System.Xml.Xsl.XmlILCommand.Execute(Object defaultDocument, XmlResolver dataSources, XsltArgumentList argumentList, XmlWriter writer, Boolean closeWriter) at System.Xml.Xsl.XmlILCommand.Execute(XmlReader contextDocument, XmlResolver dataSources, XsltArgumentList argumentList, XmlWriter results) at System.Xml.Xsl.XslCompiledTransform.Transform(XmlReader input, XsltArgumentList arguments, XmlWriter results) at Promo.Page_Load(Object sender, EventArgs e) in c:\1\promo.ascx.cs:line 144</p> <p>Now if I do this it works: </p> <pre><code>StringWriter sw = new StringWriter(); xslt.Transform(mydoc.CreateReader(),null, sw); </code></pre> <p>What am I doing wrong with the XmlWriter?</p> <p>Value of xdoc right before crash:</p> <pre><code>&lt;Promotions&gt; &lt;Promotion&gt; &lt;Category&gt;Arts &amp;amp; Entertainment&lt;/Category&gt; &lt;Client&gt;Client1&lt;/Client&gt; &lt;Title&gt;Get your Free 2&lt;/Title&gt; &lt;/Promotion&gt; &lt;Promotion&gt; &lt;Category&gt;Arts &amp;amp; Entertainment&lt;/Category&gt; &lt;Client&gt;Client1&lt;/Client&gt; &lt;Title&gt;Get your Free 4&lt;/Title&gt; &lt;/Promotion&gt; &lt;Promotion&gt; &lt;Category&gt;Arts &amp;amp; Entertainment&lt;/Category&gt; &lt;Client&gt;client1&lt;/Client&gt; &lt;Title&gt;Get your Free 5&lt;/Title&gt; &lt;/Promotion&gt; &lt;Promotion&gt; &lt;Category&gt;Community &amp;amp; Neighborhood&lt;/Category&gt; &lt;Client&gt;Client2&lt;/Client&gt; &lt;Title&gt;Get your Free 1&lt;/Title&gt; &lt;/Promotion&gt; &lt;Promotion&gt; &lt;Category&gt;Education&lt;/Category&gt; &lt;Client&gt;Client3&lt;/Client&gt; &lt;Title&gt;Get Your Free 3&lt;/Title&gt; &lt;/Promotion&gt; &lt;/Promotions&gt; </code></pre>
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    1. USJames Campbell
    1. USJames Campbell
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    1. COPlease post the rest of the stack trace of the exception. In fact, post `ex.ToString()`.
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      1. POWhat am I doing wrong here, having issues with XSLT using C#
      1. USJohn Saunders
    2. COadded it to the bottom of the question
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