source code to generate barcode in vb.net 25: The Technologies in C#

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25: The Technologies
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Figure 25-10
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The XML schema definition file
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PART V
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XSLT documents are stored in style sheets that are used to transform the XML data Let s look at our recipe XML file and combine it with an XSL style sheet
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< xml version="10" > < xml-stylesheet type="text/xsl" href="Recipexsl" > <recipe> <name>Chicken Soup <ingredient>Chicken</ingredient> <ingredient>Soup</ingredient> </name> </recipe> </RecipeSummary>
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The next step is to build the simple XSLT style sheet:
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< xml version="10" > <xsl:stylesheet xmlns:xsl="http://wwww3org/1999/XSL/Transform"> <xsl:template match="/"> <html>
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MCAD/MCSD Visual C# NET Certification All-in-One Exam Guide
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<body> <xsl:apply-templates/> </body> </html> </xsl:template> <xsl:template match="recipe"> <xsl:apply-templates/> </xsl:template> <xsl:template match="name"> <H1> <xsl:value-of select=""/> </H1> </xsl:template> <xsl:template match="ingredient"> <li> <xsl:value-of select=""/> </li> </xsl:template> </xsl:stylesheet>
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Once a parser program (such as MSXML) works through the XML file, it outputs an HTML file, as shown here:
<html> <body> <H1> Chicken Soup </H1> <li>Chicken</li> <li>Soup</li> </body> </html>
The style sheet contains the templates that tell the parser how to process the XML These templates could tell the parser to work with the data or, as in our example, create the HTML to display the data
XPath (XML Path Language)
XML Path Language (XPath) allows you to create expressions that can address sections of an XML document Using XPath, you can manipulate strings, numbers, and so forth XPath is used by XSL Transformations (XSLT), covered in the previous section When XSLT is working through parts of an XML document, it uses XPath to select a portion of the XML document by using expressions to query for particular elements in the document For example, in our demonstration in the previous section, <xsl:template match="/"> is an XPath expression that says find the beginning of the XML document (or the first line following the XML declarations)
SystemXML Namespace
In order to use these technologies programmatically, you need to know the classes that represent them The SystemXMLXSL namespace is where you will find the classes that are used to perform XSLT transformations These include
25: The Technologies
XslTransform Used to perform transformations Used to pass arguments to the transformation XsltArgumentList
The SystemXmlXPath namespace contains the classes that allow XPath expression parsing and evaluating Look for XPathDocument XPathNavigator Used to perform XSLT transformations Used to represent XPath expressions Used to access XML documents with XPath expressions
XPathExpression
This whole section has been a quick introduction to the technologies that you will use with XML Keep the various acronyms in mind as you go through the rest of the chapters in this part of the book You will be able to see where they are used and how they are used as we cover the requirements for exam 70-320
Logging Test Results and Debugging
We have included a section in this chapter on testing and debugging, since the Microsoft exam requires that you understand how to test your services This can include testing of web services, Windows services, NET remoting objecting, and so forth Each will be covered in their respective chapter and, of course, 9 introduces the concepts of testing and debugging However, in this chapter, we will deal with XML Web Services and configuring debugging and testing for your web services We will look at logging test results since that is the focus of the Microsoft 70-320 exam However, remember that you should become comfortable with debugging the services that you create, and you will find that information in the chapters that focus on each service The next chapter, for instance, is on Windows Services, and you will find a section on testing in that chapter
PART V
Control Debugging in webconfig
In order to test your web service within Visual Studio NET, you need to make sure that the webconfig file is set up properly The webconfig file is a configuration file that contains XML code specific to the settings of your application In the Solution Explorer, double-click the webconfig file to look at the configuration file (see Figure 25-11) Make sure that the debug attribute of the compilation element is set to True, as follows:
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