c# code 39 barcode generator WORKING WITH LINQ TO XML in C#

Encoder Code 39 in C# WORKING WITH LINQ TO XML

CHAPTER 13 WORKING WITH LINQ TO XML
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Figure 13-17. A validation error
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Transforming XML Trees
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In 6, we discussed how to transform XML data using XSLT style sheets. Though that approach still remains valid, LINQ to XML provides a new handy way of transforming XML data. Using this new approach, you can transform XML from one shape to another without knowing anything about XSLT.
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Note The shape of an XML document refers to its element names, attribute names, and nesting of its hierarchy.
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There are two common scenarios in transforming XML: You may want to transform an XML tree into an HTML tree. Similarly, you may want to transform an XML tree into another XML tree with an altogether different shape. You may want to project source XML code into an altogether different type. In any case, LINQ to XML, along with its functional construction feature, provides an easy way to accomplish your task.
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Changing the Shape of an XML Tree
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Your transformation may call for a change in the shape of source XML tree. This is a common scenario when you wish to transform XML into HTML for the purpose of displaying in the browser. This might also be needed while transferring XML data from one software system to another when the other system expects a different XML shape. To demonstrate how functional construction in LINQ to XML makes it easy to accomplish such change in the shape, we will create an application like the one shown in Figure 13-18.
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Figure 13-18. Application that transforms XML into HTML The application consists of a button titled Transform XML to HTML and a check box. When you click the button, the XML data from Employees.xml is transformed into an HTML table and
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saved as Employees.htm. If the check box is checked, the Employees.htm file is displayed in the browser. The code that does the job of transforming the data is shown in Listing 13-26. Listing 13-26. Transforming an XML Tree Using Functional Construction private void button1_Click(object sender, EventArgs e) { XElement root = XElement.Load(Application.StartupPath + @"\employees.xml"); XElement html = new XElement("html", new XElement("body", new XElement("table", new XAttribute("border",1), new XElement("th", "Employee ID"), new XElement("th", "First Name"), new XElement("th", "LastName"), new XElement("th", "Home Phone"), new XElement("th", "Notes"), from item in root.Descendants("employee") select new XElement("tr", new XElement("td", item.Attribute("employeeid").Value), new XElement("td", item.Element("firstname").Value), new XElement("td", item.Element("lastname").Value), new XElement("td", item.Element("homephone").Value), new XElement("td", item.Element("notes").Value))))); html.Save(Application.StartupPath + @"\employees.htm"); if (checkBox1.Checked) { Process.Start(Application.StartupPath + @"\employees.htm"); } else { MessageBox.Show("Output saved as " + Application.StartupPath + @"\employees.htm"); } } The code loads the Employees.xml file into an instance of the XElement class. It then creates another XElement named html using functional construction. Notice how the XML data is selected from descendent <employee> elements into the new XElement objects. Effectively, in just one statement, we are able to transform the source XML tree into HTML.
CHAPTER 13 WORKING WITH LINQ TO XML
The new XElement formed after transformation is saved to the disk as the Employees.htm file. If the check box is checked, the code opens the Employees.htm file in the browser; otherwise, a success message box is displayed. Figure 13-19 shows the Employees.htm file generated as a result of a sample run of the application.
Figure 13-19. Resultant HTML markup
Note In addition to using functional construction, you can also create individual XElements and
XAttributes and then create the required nesting. However, functional construction makes your code tidy and easy to read. If your XML data is generated as a result of some complex processing or logic, then you may need to create various elements and attributes as stand-alone entities and then associate them with each other. This process is very similar to the approach taken by XML DOM.
Projecting a New Type
Projection is the process by which source data is filtered, has its shape changed, or even has its type changed. For example, suppose that you want to load data from Employees.xml into a new collection of Employee objects such that each Employee object has the values filled from the <firstname>, <lastname>, <homephone>, and <notes> elements of the source XML. In order to illustrate how projection works, we will create an application like the one shown in Figure 13-20. The application consists of a button titled Project XML as a Collection and a DataGridView control. When you click the button, data from Employees.xml is projected as a collection of an anonymous type. The collection is then displayed in the DataGridView.
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