C# 4 and .NET 4

924 ❘ ChaPTer 33 mAnipulAtinG xml
The following is what the output of the transform looks like; the output has been formatted for easier
viewing (argSample.xml):
The Autobiography of Benjamin Franklin
This came from the ShowText method!
The Confidence Man
This came from the ShowText method!
The Gorgias
This came from the ShowText method!
The Great Cookie Caper
This came from the ShowText method!
A Really Great Book
This came from the ShowText method!
In this example, you define a new class, BookUtils. In this class, you have one rather useless method that
returns the string This came from the ShowText method! In the button3_Click() event, you create
the XPathDocument and XslTransform objects. In a previous example, you loaded the XML document
and the transform document directly into the XslCompiledTransform object. This time, you will use the
XPathNavigator to load the documents.
Next, you need to write the following:
XsltArgumentList argBook=new XsltArgumentList();
BookUtils bu=new BookUtils();
argBook.AddExtensionObject("urn:XslSample",bu);
This is where you create the XsltArgumentList object. You create an instance of the BookUtils object,
and when you call the AddExtensionObject() method, you pass in a namespace for your extension and the
object that you want to be able to call methods from. When you make the Transform() call, you pass in
the XsltArgumentList (argBook), along with the XPathNavigator and the XmlWriter object you made.
The following is the booksarg.xsl document (based on books.xsl):
www.it-ebooks.info