c# code 39 checksum Using the XmlDataDocument Class in Visual C#

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Using the XmlDataDocument Class
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To see how the XmlDataDocument class can be used, let s consider the following scenario: assume that you wish to develop a data-entry screen for the same Employees.xml file that we used earlier. The data-entry screen should be grid based and should allow the user to export the data as an HTML file. The HTML file can then be published in a web application. The preceding scenario calls for a DataSet to bind with the grid and it also calls for XSLT processing so that the data can be exported to HTML. In such cases, XmlDataDocument provides an effective solution. Let s see how. You need to develop a Windows application like the one shown in Figure 7-20.
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Figure 7-20. Application for illustrating the use of XmlDataDocument
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The application consists of a DataGridView control that displays the data from the Employees.xml file. You can modify the data and click the Export as HTML Page button to save the data as an HTML file. The Load event of the form is shown in Listing 7-22. Listing 7-22. Creating an XmlDataDocument from an XML File XmlDataDocument doc = null; private void Form1_Load(object sender, EventArgs e) { DataSet ds = new DataSet(); ds.ReadXml(Application.StartupPath + @"\employees.xml"); doc = new XmlDataDocument(ds); dataGridView1.DataSource = ds.Tables[0]; } The code declares a class-level variable of type XmlDataDocument. The Load event of the form creates an instance of DataSet and reads the Employees.xml file into it by using ReadXml(). Then a new instance of XmlDataDocument is created by passing the DataSet we just created to its constructor. Thus our example constructs an XmlDataDocument by using a DataSet. The DataTable from the DataSet is then assigned as the DataSource of the DataGridView control. This way, the data from Employees.xml is available for editing. The Click event of the Export as HTML Page button is shown in Listing 7-23. Listing 7-23. Applying XSLT Transformations on XmlDataDocument private void button1_Click(object sender, EventArgs e) { XslCompiledTransform xslt = new XslCompiledTransform(); xslt.Load(Application.StartupPath + @"\employees.xslt"); XmlTextWriter writer = new XmlTextWriter(Application.StartupPath + @"\employees.html", null); xslt.Transform(doc, writer); writer.Close(); } The code creates an instance of the XslCompiledTransform class, and the XSLT style sheet is loaded by using its Load() method. Then an instance of XmlTextWriter is created to write the transformed data into an HTML file (Employees.html). The Transform() method of XslCompiledTransform is then called, and the XmlDataDocument and XmlTextWriter objects are passed to it as parameters. The Transform() method accesses the XML data from the XmlDataDocument class, applies the style sheet to it, and writes the transformed data by using XmlTextWriter.
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CHAPTER 7 XML IN A DO.NE T
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Note In the preceding example, we use the same XML file and XSLT style sheet that we developed in
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6. See Listing 6-2 for the complete markup of Employees.xslt. Also, make sure that you copy these files to the Bin\Debug folder of your project before you run the application.
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In the preceding example, we created an XmlDataDocument by using a DataSet, but you can also create an XmlDataDocument by using an XML document. In the latter case, you can use the Load() method of XmlDataDocument. This method works the same way as with the XmlDocument class (see 2). You can then use the loaded XML data in a relational manner with the help of the DataSet property of the XmlDataDocument class.
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Converting Between DataRow and XmlElement
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Sometimes you may need to access the XML element belonging to a DataRow from the DataSet. This can be achieved by using the GetElementFromRow() method of XmlDataDocument. This method accepts a reference to a DataRow instance from the DataSet and returns an XmlElement corresponding to that row. The working of the GetElementFromRow() method will be clear when you develop the application shown in Figure 7-21.
Figure 7-21. Application using the GetElementFromRow() method The application consists of a DataGridView control. The Employees.xml file is read into a DataSet, and the DataSet is bound to the grid. After you click the Get Element From Row button, a message box displays the XML markup of the corresponding element (Figure 7-22).
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