winforms code 128

winforms code 128

winforms code 128

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Data in an XML document is contained in an XML tree, which consists mainly of a set of nested elements. The element is the fundamental constituent of an XML tree. Every element has a name and can contain data. Some can also contain other, nested elements. Elements are demarcated by opening and closing tags. Any data contained by an element must be between its opening and closing tags. An opening tag starts with an open angle bracket, followed by the element name, followed optionally by any attributes, followed by a closing angle bracket. <PhoneNumber> A closing tag starts with an open angle bracket, followed by a slash character, followed by the element name, followed by a closing angle bracket. </PhoneNumber> An element with no content can be represented by a single tag that starts with an open angle bracket, followed by the name of the element, followed by a slash, and is terminated with a closing angle bracket. <PhoneNumber /> The following XML fragment shows an element named EmployeeName followed by an empty element named PhoneNumber. <EmployeeName>Sally Jones</EmployeeName> Opening tag Content Closing tag <PhoneNumber /> Element with no content Other important things to know about XML are the following: XML documents must have a single root element that contains all the other elements. XML tags must be properly nested. Unlike HTML tags, XML tags are case sensitive. XML attributes are name/value pairs that contain additional metadata about an element. The value part of an attribute must always be enclosed in quotation marks, which can be either double quotation marks or single quotation marks. Whitespace within an XML document is maintained. This is unlike HTML, where whitespace is consolidated to a single space in the output.

The following XML document is an example of XML that contains information about two employees. This XML tree is extremely simple in order to show the elements clearly. The important things to notice about the XML tree are the following: The tree contains a root node of type Employees that contains two child nodes of type Employee. Each Employee node contains nodes containing the name and phone numbers of an employee.

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Using the Web to compete with established businesses was a pipe dream. It could never work. Why not Established businesses spent millions to get where they are, and they will not fall down and play dead just because some Web site comes along. If it were easy, you would have lots of Web competitors, and you would soon nd it dif cult. Furthermore, if it were easy, the established businesses could always beat you by doing exactly what you are trying to do, because they know a lot more about it than you do.

<Employees> <Employee> <Name>Bob Smith</Name> <PhoneNumber>408-555-1000</PhoneNumber> <CellPhone /> </Employee> <Employee> <Name>Sally Jones</Name> <PhoneNumber>415-555-2000</PhoneNumber> <PhoneNumber>415-555-2001</PhoneNumber> </Employee> </Employees> Figure 21-13 illustrates the hierarchical structure of the sample XML tree.

LINQ to XML can be used to work with XML in two ways. The first way is as a simplified XML manipulation API. The second way is to use the LINQ query facilities you ve seen throughout the earlier part of this chapter. I ll start by introducing the LINQ to XML API. The LINQ to XML API consists of a number of classes that represent the components of an XML tree. The three most important classes you ll use are XElement, XAttribute, and XDocument. There are other classes as well, but these are the main ones. In Figure 21-13, you saw that an XML tree is a set of nested elements. Figure 21-14 shows the classes used to build an XML tree and how they can be nested. For example, the figure shows the following: An XDocument node can have the following as its direct child nodes: At most, one of each of the following node types: an XDeclaration node, an XDocumentType node, and an XElement node Any number of XProcessingInstruction nodes

From the previous discussion, it is obvious that for most companies, Web sites cannot be successful sales channels to consumers for most of their products. They are primarily ordering vehicles and information providers. They may be excellent sales channels for spare parts and supplies and for obscure and slow-moving items that dealers will not stock. To think properly about the role of the Web site, we must begin to think of it as a cross between mass media ads, spare parts distributors, and customer service. The value of a manufacturer s consumer Web site today is estimated in Table 3-1. Table 3-1 Monthly Value of a Commercial Consumer Web Site

If there is a top-level XElement node under the XDocument, it is the root of the rest of the elements in the XML tree. The root element can in turn contain any number of nested XElement, XComment, or XProcessingInstruction nodes, nested to any level.

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