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Knowing When to Use DOM
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Before you go ahead and use DOM for accessing your XML documents, you should understand the areas to which DOM is best suited and areas where its use should be avoided. The decision of whether to use DOM is governed by the following core factors: Read/write access: DOM allows you to read and write the XML document. But do you really need to change the underlying document Memory footprint: DOM loads the entire document in memory. Naturally the memory footprint of DOM is larger. Are your documents large, say over 100MB Type of access: DOM allows you to access any node randomly. This is possible because the entire document tree is available in memory. Do you need such access Or is sequential access sufficient Answers to the preceding questions will help you to decide whether to use DOM. To summarize, DOM is best suited in the following scenarios: You want to modify the XML documents, that is, read-only access is not sufficient. You want to access various nodes randomly, that is, sequential access is not sufficient. You want to process documents that are small in size. The memory footprint is not a constraint.
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A Sample XML Document
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Throughout this chapter, we will be using an XML document that resides on the disk as a file named Employees.xml. The Employees.xml file is shown in Listing 2-2. Listing 2-2. A Sample XML Document < xml version="1.0" encoding="utf-8" > <!-- This is list of employees --> <employees> <employee employeeid="1"> <firstname>Nancy</firstname> <lastname>Davolio</lastname> <homephone>(206) 555-9857</homephone> <notes> <![CDATA[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.]]> </notes> </employee> <employee employeeid="2"> <firstname>Andrew</firstname> <lastname>Fuller</lastname> <homephone>(206) 555-9482</homephone> <notes> <![CDATA[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.]]> </notes> </employee> <employee employeeid="3"> <firstname>Janet</firstname> <lastname>Leverling</lastname> <homephone>(206) 555-3412</homephone> <notes> <![CDATA[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.]]> </notes> </employee> </employees>
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This XML document represents a list of employees. The <employees> element forms the document element and contains three <employee> child elements. The <employee> element has an attribute called employeeid and four subelements: <firstname>, <lastname>, <homephone>, and <notes>. The <notes> element contains descriptive data that is stored as CDATA. To create an XML file, you can enlist the help of the Visual Studio IDE, which enables you to quickly create XML documents by auto-completing end tags, putting attributes in quotes, and showing errors related to the document not being well formed. Because we will be using this file often, I recommend that you create it and keep it in a handy location on your hard disk.
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Opening an Existing XML Document for Parsing
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To open an existing XML document, you need to use the XmlDocument class. The XmlDocument class allows you to open XML documents in three common ways: You can specify the path to, or URL of, the XML file. You can use a stream object such as FileStream that contains the XML data. You can hold a string in memory that contains the XML data. To see how each of the preceding approaches can be used, you need to develop a Windows application like the one shown in Figure 2-2.
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Figure 2-2. Opening an XML document The application consists of three radio buttons for selecting the place from where the XML document is to be loaded. There is a text box for entering the file path, URL, or XML string. Finally, there is a button titled Open Document that opens the XML file depending on the selection and shows a message box with a success message.
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Note I have not included any input validation code in the examples so as to keep the examples focused
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