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2009-03-04 Extending XSLT
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| # Title: Extending XSLT | |
| # Author: Mikael Lundin | |
| # Link: http://blog.mikaellundin.name/2009/03/04/extending-xslt.html |
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| XslCompiledTransform transformer = new XslCompiledTransform(debug); | |
| XsltSettings settings = new XsltSettings(false, false); // document() and script disabled | |
| XsltArgumentList arguments = new XsltArgumentList(); | |
| arguments.AddExtensionObject("urn:mint", new XsltExtensions()); | |
| transformer.Load(XmlReader.Create(stylesheetStream), settings, null); | |
| transformer.Transform(XmlReader.Create(documentStream), arguments, output); |
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| /// <summary> | |
| /// An extension class for an XSL transformation | |
| /// </summary> | |
| public interface IXsltExtensions | |
| { | |
| /// <summary> | |
| /// Gets the namespace URI that associates this class with a namespace in the xslt. | |
| /// </summary> | |
| /// <value>The namespace URI.</value> | |
| string NamespaceUri { get; } | |
| } |
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| /// <summary> | |
| /// Loads the XSLT extensions into the argument list | |
| /// </summary> | |
| /// <param name="arguments">The argumentlist that will be used in transfomation</param> | |
| private void LoadExtensions(XsltArgumentList arguments) | |
| { | |
| // Retrieve all implementations of IXsltExtensions | |
| IEnumerable<IXsltExtensions> extensions = ContainerFactory.Instance.ResolveAll<IXsltExtensions>(); | |
| // Add all implementations as extensions to the transformation | |
| foreach (IXsltExtensions extensionObject in extensions) | |
| arguments.AddExtensionObject(extensionObject.NamespaceUri, extensionObject); | |
| } |
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| <xsl:stylesheet version="2.0" | |
| xmlns:xsl="http://www.w3.org/1999/XSL/Transform" | |
| xmlns="http://www.w3.org/1999/xhtml" | |
| xmlns:mint="urn:mint"> | |
| <xsl:output method="xhtml" encoding="utf-8" indent="yes" media-type="application/xhtml+xml" /> | |
| <xsl:template match="/"> | |
| <html> | |
| <head> | |
| <title> | |
| <xsl:value-of select="//title" /> | |
| </title> | |
| </head> | |
| <body> | |
| <h1>Value of parameter test is: <xsl:value-of select="mint:parameter('test')" /></h1> | |
| </body> | |
| </html> | |
| </xsl:template> | |
| </xsl:stylesheet> |
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| /// <summary> | |
| /// Default extensions for Mint transformations | |
| /// </summary> | |
| public class XsltExtensions | |
| { | |
| /// <summary> | |
| /// Returns parameter of the current HttpContext.Request | |
| /// </summary> | |
| /// <param name="parameterName">Name of the parameter to retrieve</param> | |
| /// <returns>String.Empty if parameter is not found</returns> | |
| public string parameter(string parameterName) | |
| { | |
| return HttpContext.Current.Request.Params[parameterName] ?? string.Empty; | |
| } | |
| } |
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