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Looking for Specific Elements and Nodes
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Often we are not interested in the entire XML document loaded in memory but a part of it. This requires us to search for a specific element or node for further processing. There are several methods used to search the XML document: Retrieving specific elements using the GetElementByTagName() method Retrieving specific elements using the GetElementById() method Selecting specific nodes using the SelectNodes() method Selecting a single specific node using the SelectSingleNode() method
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Retrieving Specific Elements Using the GetElementByTagName() Method
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The GetElementsByTagName() method of the XmlDocument class accepts the name of the tag (excluding < and >) and returns all the nodes matching that tag name. The matching nodes are returned as an XmlNodeList. The XmlNodeList class represents a collection of XmlNode objects. To see GetElementsByTagName() in action, we need to develop a Windows application like the one shown in Figure 2-4.
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Figure 2-4. Using the GetElementsByTagName() method The application consists of a text box to enter the tag name to look for. After you click the Search button, the matching tags are displayed in the list box. Selecting a tag from the list box displays its contents in a read-only text box. The code that makes the preceding form work is given in Listing 2-5. Listing 2-5. Using the GetElementsByTagName() Method XmlNodeList list = null; private void button1_Click(object sender, EventArgs e) { XmlDocument doc = new XmlDocument(); doc.Load(Application.StartupPath + "/employees.xml"); list = doc.GetElementsByTagName(textBox1.Text); listBox1.Items.Clear(); foreach (XmlNode node in list) { listBox1.Items.Add(node.Name); } } private void listBox1_SelectedIndexChanged(object sender, EventArgs e) { textBox2.Text = list[listBox1.SelectedIndex].InnerXml; }
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The code declares a variable of type XmlNodeList at the form level. This variable needs to be declared at the form level because we need to access it in two event handlers. In the Click event handler of the Search button, an XmlDocument instance is created. The Employees.xml file is loaded into it by using its Load() method. The code then calls the GetElementByTagName() method of the XmlDocument object, which accepts the tag name to look for. In our application, the tag is specified in textBox1. As mentioned earlier, the return value of the GetElementByTagName() method is of type XmlNodeList. The XmlNodeList class stores the collection of XmlNode objects. The code then iterates through the returned XmlNodeList and adds each node name into the list box. The user can select any of the nodes displayed in the list box. In order to show the contents of the selected node, the code handles the SelectedIndexChanged event of the list box. Inside the SelectedIndexChanged event handler, the selected node is retrieved from the XmlNodeList we stored previously. The contents of the selected node are displayed using the InnerXml property of the XmlNode class, which returns all the XML content that is inside the node under consideration. To see how the application works, run it from the Visual Studio IDE. Enter firstname in the search text box, and click the Search button. The list box should display three firstname entries. This is expected because our XML document contains three <employee> nodes, each having a <firstname> child element of its own. Click any of the firstname entries from the list box. The text box beside the list box should show the value of the firstname node.
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Often, our XML elements have an attribute that is unique for each instance of that element in the XML document. We may want to look for a specific element based on this attribute value. This process is analogous to looking for a record in a database based on its primary key. The difference, however, is that the XmlDocument class does not know automatically that a specific attribute is acting as a primary key for that element. Formally, such an attribute is called the ID of that element. To convey this information, you must use a DTD or schema. Both of these techniques can mark an attribute as the ID of the element, and the XmlDocument class can then understand them as IDs. After you have a DTD or schema attached to your XML document, you can call the GetElementById() method of the XmlDocument class. The GetElementById() method accepts the ID of the element to search for and returns that element as an instance of the XmlElement class. You can then access the subelements or text inside this element. To illustrate the use of the GetElementById() method, we will build an application like the one shown in Figure 2-5. The application consists of a combo box showing a list of employee IDs. After you select an ID and click the Show Details button, the details such as firstname, lastname, homephone, and notes are displayed below.
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