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POHow to resolve XSL includes in a Transformation that loads XSL from a String?
 

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  1. POHow to resolve XSL includes in a Transformation that loads XSL from a String?
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    <p><strong>.NET 2.0/VS2005</strong></p> <p>I am trying to use the <code>XslCompiledTransform</code> class to perform a XSL Transformation. I have two XSL files, the first of which includes a reference to the other in the form of an <code>&lt;xsl:include&gt;</code> statement :</p> <p><strong>Main.xsl:</strong></p> <pre><code>&lt;xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"&gt; &lt;xsl:include href="Included.xsl" /&gt; ... ... &lt;/xsl:stylesheet&gt; </code></pre> <p>Now, If I could load the "Main.xsl" file itself as a URI, my transformation code would be as simple as :</p> <pre><code>// This is a function that works. For demo only. private string Transform(string xslFileURI) { XslCompiledTransform xslt = new XslCompiledTransform(); // This load works just fine, if I provide the path to "Main.xsl". // The xsl:include is automatically resolved. xslTransform.Load(xslFileURI); StringWriter sw = new StringWriter(); xslt.Transform(Server.MapPath("~/XML/input.xml"), null, sw); return sw.ToString(); } </code></pre> <p>The problem is that I receive the contents of the Main.xsl file as a string and need to load the string as an <code>XmlReader/IXpathNavigable</code>. <strong><em>This is a necessary restriction at this time.</em></strong> When I try to do the same using an <code>XmlReader/XpathDocument</code>, it fails because the code looks for "Included.xsl" in the <code>C:\Program Files\Microsoft Visual Studio 8\Common7\IDE\</code> folder! Obviously, the <code>XmlResolver</code> is not able to resolve the relative URL because it only receives a string as input XSL.</p> <p><strong>My efforts in this direction look like:</strong></p> <pre><code>// This doesn't work! Halp! private string Transform(string xslContents) { XslCompiledTransform xslt = new XslCompiledTransform(); XmlUrlResolver resolver = new XmlUrlResolver(); resolver.Credentials = CredentialCache.DefaultCredentials; //METHOD 1: This method does not work. XmlReaderSettings settings = new XmlReaderSettings(); settings.XmlResolver = resolver; XmlReader xR = XmlReader.Create(new StringReader(xslContents), settings); xslt.Load(xR); // fails // METHOD 2: Does not work either. XPathDocument xpDoc = new XPathDocument(new StringReader(xslContents)); xslt.Load(xpDoc, new XsltSettings(true, true), resolver); //fails. StringWriter sw = new StringWriter(); xslt.Transform(Server.MapPath("~/XML/input.xml"), null, sw); return sw.ToString(); } </code></pre> <p>I have tried to use the <code>ResolveUri</code> method of the XmlUrlResolver to obtain a <code>Stream</code> referencing the XSL file to be included, but am confused as to how to use this Stream. IOW, how do I tell the <code>XslCompiledTransform</code> object to use this stream in addition to the Main.xsl XmlReader:</p> <pre><code>Uri mainURI = new Uri(Request.PhysicalApplicationPath + "Main.xsl"); Uri uri = resolver.ResolveUri(mainURI, "Included.xsl"); // I can verify that the Included.xsl file loads in the Stream below. Stream s = resolver.GetEntity(uri, null, typeof(Stream)) as Stream; // How do I use this Stream in the function above?? </code></pre> <p><br /> Any help is greatly appreciated. Sorry for the long post!</p> <p>For your reference, the Exception StackTrace looks like this:</p> <pre><code>[FileNotFoundException: Could not find file 'C:\Program Files\Microsoft Visual Studio 8\Common7\IDE\Included.xsl'.] System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) +328 System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy) +1038 System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize) +113 System.Xml.XmlDownloadManager.GetStream(Uri uri, ICredentials credentials) +78 System.Xml.XmlUrlResolver.GetEntity(Uri absoluteUri, String role, Type ofObjectToReturn) +51 System.Xml.Xsl.Xslt.XsltLoader.CreateReader(Uri uri, XmlResolver xmlResolver) +22 System.Xml.Xsl.Xslt.XsltLoader.LoadStylesheet(Uri uri, Boolean include) +33 System.Xml.Xsl.Xslt.XsltLoader.LoadInclude() +349 System.Xml.Xsl.Xslt.XsltLoader.LoadRealStylesheet() +704 System.Xml.Xsl.Xslt.XsltLoader.LoadDocument() +293 System.Xml.Xsl.Xslt.XsltLoader.LoadStylesheet(XmlReader reader, Boolean include) +173 </code></pre>
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    1. COI'm working on something similar to what your question seems to require and I found an MSDN article – [Resolving the Unknown: Building Custom XmlResolvers in the .NET Framework](http://msdn.microsoft.com/en-us/library/aa302284.aspx) – that seems to provide a very promising solution.
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      1. POHow to resolve XSL includes in a Transformation that loads XSL from a String?
      1. USKenny Evitt
 

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