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C HA PTER 6 TRAN SFORM IN G XML WITH XSLT
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Make sure to import the System.Xml.Xsl namespace because the XslCompiledTransform class resides in it. Notice the code marked in bold. To start with, the code creates an instance of the XslCompiledTransform class. The Load() method of XslCompiledTransform accepts the path of the XSLT style sheet to be applied and loads it for transformation. However, it is the Transform() method that actually performs the transformation by applying the style sheet loaded by using the Load() method. There are several overloads of the Transform() method; the one that we have used accepts two string parameters. The first parameter is the path of the source XML document, and the second parameter is the path of the destination document. After the transformation, the resultant output is saved in the file specified by the second parameter of the Transform() method. Finally, the file is opened with the associated application by using the Start() method of the Process class. To test the application, you can use the Employees.xml and Employees.xslt files (see Listing 6-2) that we used earlier in this chapter. Note that Employees.xml no longer needs to have the xml-stylesheet processing instruction. When you supply all the filenames and click the Transform button, you should see the Employees.html file generated in the specified folder. The Employees.html file will have HTML markup as shown in Listing 6-10. Listing 6-10. Output After Applying the Style Sheet <html> <body> <h1>Employee Listing</h1> <table border="1"> <tr> <th>Employee ID</th> <th>First Name</th> <th>Last Name</th> <th>Home Phone</th> <th>Notes</th> </tr> <tr> <td>1</td> <td>Nancy</td> <td>Davolio</td> <td>(206) 555-9857</td> <td> includes a BA in psychology from Colorado State University in 1970. She also completed "The Art of the Cold Call." Nancy is a member of Toastmasters International. </td> </tr> <tr> <td>2</td> <td>Andrew</td> <td>Fuller</td> <td>(206) 555-9482</td>
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<td> Andrew received his BTS commercial in 1974 and a Ph.D. in international marketing from the University of Dallas in 1981. He is fluent in French and Italian and reads German. He joined the company as a sales representative, was promoted to sales manager in January 1992 and to vice president of sales in March 1993. Andrew is a member of the Sales Management Roundtable, the Seattle Chamber of Commerce, and the Pacific Rim Importers Association. </td> </tr> <tr> <td>3</td> <td>Janet</td> <td>Leverling</td> <td>(206) 555-3412</td> <td> Janet has a BS degree in chemistry from Boston College (1984). She has also completed a certificate program in food retailing management. Janet was hired as a sales associate in 1991 and promoted to sales representative in February 1992. </td> </tr> </table> </body> </html> As you can see, the source XML markup is transformed into HTML markup as specified in the style sheet.
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Note In our example, we converted XML markup into HTML markup. However, you can easily use the
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XslCompiledTransform class to transform source XML into another XML representation.
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Passing Arguments to a Transformation
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In Listing 6-5, you created a style sheet that transforms details of a single employee, Nancy, by using the <xsl:if> element. The problem with our XSLT is that we hard-coded the name Nancy in the style sheet. In real-world cases, this name will probably come from a user interface element. Thus it becomes necessary that the employee s first name be accepted as a parameter in the XSLT rather than a fixed value. Fortunately, XSLT allows you to declare parameters in your style sheet. These parameters can then be supplied at run time from your application. A collection of these parameters is represented by the XsltArgumentList class, and you can add individual parameters to this collection. To illustrate the use of XsltArgumentList, we will develop an application like the one shown in Figure 6-6.
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C HA PTER 6 TRAN SFORM IN G XML WITH XSLT
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Figure 6-6. Application for passing parameters to the XSLT style sheet The application consists of a single text box for accepting the first name of the employee. Clicking the Transform button applies the style sheet and stores the resultant output in an HTML file. Our XML file remains the same (Employees.xml). However, you need to modify the style sheet from Listing 6-5 as shown in Listing 6-11. Listing 6-11. XSLT Style Sheet with Parameter < xml version="1.0" encoding="UTF-8" > <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:param name="firstname"/> <xsl:template match="/"> <html> <body> <h1>Employee Listing</h1> <table border="1"> <tr> <th>Employee ID</th> <th>First Name</th> <th>Last Name</th> <th>Home Phone</th> <th>Notes</th> </tr> <xsl:for-each select="employees/employee"> <xsl:if test="firstname[text()=$firstname]"> <tr> <td> <xsl:value-of select="@employeeid"/> </td> <td> <xsl:value-of select="firstname"/> </td> <td> <xsl:value-of select="lastname"/> </td> <td> <xsl:value-of select="homephone"/> </td>
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