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Listing 2-11. Using the SelectSingleNode() Method XmlNode node = null; private void button1_Click(object sender, EventArgs e) { XmlDocument doc = new XmlDocument(); doc.Load(Application.StartupPath + "/employees.xml"); if (radioButton1.Checked) { node = doc.SelectSingleNode("//employee[./firstname/text()='" + textBox1.Text + "']"); } else { node = doc.SelectSingleNode("//employee[./lastname/text()='" + textBox1.Text + "']"); } if (node != null) { comboBox1.Items.Add(node.Attributes["employeeid"].Value); } } private void button2_Click(object sender, EventArgs e) { label8.Text = node.ChildNodes[0].InnerText; label9.Text = node.ChildNodes[1].InnerText; label10.Text = node.ChildNodes[2].InnerText; label11.Text = node.ChildNodes[3].InnerText; } The code now declares a variable of type XmlNode at the form level. The Click event handler of the Search button calls the SelectSingleNode() method, which accepts the same XPath expression as in the previous example. This method returns the first matching node instead of an XmlNodeList, though our search criteria may not necessarily return any matching node. Therefore, the code accesses the XmlNode variable only if it is not null. In the Click event of the Show Details button, the XmlNode variable node is used to retrieve employee details.
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Up until this point, we have seen how to read XML documents; how to navigate through them; and how to search them on the basis of tag names, IDs, and XPath expressions. But what about modifying them That s the topic of this section.
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Often business requirements call for modification of the underlying XML document. This modification can be an addition, a deletion, or a modification of nodes or attributes. As you saw previously, DOM is a read-write parser. That means DOM APIs also allow you to modify the document. To illustrate the use of several System.Xml classes for modifying XML documents, we are going to develop a Windows application like the one shown in Figure 2-7.
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Figure 2-7. Data entry screen for the Employees.xml file The application represents a complete data entry screen for the Employees.xml file. The application allows us to do the following tasks: Navigate among the available employees with the help of VCR buttons (the buttons used to navigate to the previous, next, first, and last records are often called VCR buttons). Add a new employee. Modify the details of a particular employee. The employee ID attribute acts like a primary key for our XML document, and hence it cannot be changed. Delete an existing employee. If you look at the source code of the preceding application, you will see two form-level variables as shown here: XmlDocument doc = new XmlDocument(); int CurrentNodeIndex = 0; The XmlDocument instance is used throughout the application. The integer variable CurrentNodeIndex is used to keep track of the current employee record that is being displayed (it is mainly used by the navigational buttons). The Load event handler of the form is shown in Listing 2-12.
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Listing 2-12. Filling Controls private void Form1_Load(object sender, EventArgs e) { doc.Load(Application.StartupPath + "/employees.xml"); foreach (XmlNode node in doc.DocumentElement.ChildNodes) { comboBox1.Items.Add(node.Attributes["employeeid"].Value); } FillControls(); } The preceding code loads the Employees.xml file by using the Load() method. It then iterates through all the <employee> nodes and fills the combo box with employee IDs. The employeeid attribute is retrieved by using the Attributes collection of the XmlNode class. Finally, the code calls a helper method called FillControls(). This method simply displays first name, last name, home phone, and notes from the current <employee> node in various text boxes. We will be looking at the FillControls() method shortly.
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The application allows you to navigate between various <employee> nodes with the help of VCR navigation buttons. Listing 2-13 shows how the navigation buttons work. Listing 2-13. Working of Navigation Buttons //go to first record private void button4_Click(object sender, EventArgs e) { CurrentNodeIndex = 0; FillControls(); } //go to previous record private void button5_Click(object sender, EventArgs e) { CurrentNodeIndex--; if (CurrentNodeIndex < 0) { CurrentNodeIndex = 0; } FillControls(); } //go to next record
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