c# code 39 generator Figure 2-11. Result when the PreserveWhitespace property is false in C#

Printer USS Code 39 in C# Figure 2-11. Result when the PreserveWhitespace property is false

Figure 2-11. Result when the PreserveWhitespace property is false
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Figure 2-12. Result when the PreserveWhitespace property is true Surprised We have three <employee> elements in our document. That means the <employees> node has three child nodes. The message box from Figure 2-11 is consistent with this fact. However, when you set the PreserveWhitespace property to true, the message box shows that the <employees> element has seven child nodes. Preserving white space added four child nodes to the <employees> element. These extra nodes are of type XmlWhiteSpace. If you are accessing various nodes by their indexes, toggling white space can cause your logic to fail. There is one more class related to white space: XmlSignificantWhitespace. The XmlSignificantWhitespace class represents white space between markup in a mixed content node. It is important to understand the difference between XmlWhiteSpace and XmlSignificantWhitespace. Consider the markup shown in Listing 2-20.
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Listing 2-20. Understanding the Difference Between the XmlWhiteSpace and XmlSignificantWhiteSpace Classes < xml version="1.0" > <root> <fullname>Nancy Davolio</fullname> <address> 23143 Sagebrush Novi, MI 48375 USA </address> </root> In the markup shown in Listing 2-20, there are several white spaces. First, there are white spaces between tags such as <root>, <fullname>, and <address>. Remember that in XML, carriage returns and line feeds are also considered white spaces. These white spaces between various elements are used mainly to improve readability of the document and are represented by the XmlWhiteSpace class. Second, there are white spaces embedded within the content of the <address> node. For example, there is a carriage return and line feed after the text Novi as well as MI 48375. These white spaces are represented by the XmlSignificantWhiteSpace class.
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Dealing with Namespaces
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The concept of XML namespaces is analogous to .NET namespaces. XML namespaces allow you to identify elements as part of a single group (a namespace) by uniquely qualifying element and attribute names used in an XML document. Each namespace is identified by a Uniform Resource Identifier (URI). This allows developers to combine information from different data structures in a single XML document without causing ambiguity and confusion among element names. For example, assume that you have two XML fragments, one related to employees and another related to customers. Further assume that both fragments contain a tag called <name>. The problem is that when you mix them together, you have ambiguity for the <name> tag. XML namespaces come in handy in such situations. To see how .NET provides support for XML namespaces, we will modify Employees.xml as shown in Listing 2-21. Listing 2-21. XML Document with Namespaces < xml version="1.0" encoding="utf-8" > <!-- This is list of employees --> <emp:employees xmlns:emp="http://www.somedomain.com"> <emp:employee employeeid="1"> <emp:firstname>Nancy</emp:firstname> <emp:lastname>Davolio</emp:lastname> <emp:homephone>(206) 555-9857</emp:homephone>
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<emp: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.]]> </emp:notes> </emp:employee> <emp:employee employeeid="2"> <emp:firstname>Andrew</emp:firstname> <emp:lastname>Fuller</emp:lastname> <emp:homephone>(206) 555-9482</emp:homephone> <emp: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.]]> </emp:notes> </emp:employee> <emp:employee employeeid="3"> <emp:firstname>Janet</emp:firstname> <emp:lastname>Leverling</emp:lastname> <emp:homephone>(206) 555-3412</emp:homephone> <emp: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.]]> </emp:notes> </emp:employee> </emp:employees> It s the same document, but we have added a namespace to it. Look at the markup shown in bold. In the root element <employees>, we specified an XML namespace called emp with a URI http://www.somedomain.com. Though it is a common practice to use URLs as namespace URIs, any unique string would work. Note how all the tag names are prefixed with emp. You can access namespace details by using three properties of the XmlNode class: NamespaceURI, Prefix, and LocalName. To illustrate how these properties are used, we will develop an application like the one shown in Figure 2-13.
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