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CH APT ER 4 AC CE SSI NG XM L DO C UMENT S BY USI NG TH E XPAT H DA TA MO D EL
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do { switch (navigator.Name) { case "firstname": textBox2.Text = navigator.Value; break; case "lastname": textBox3.Text = navigator.Value; break; case "homephone": textBox4.Text = navigator.Value; break; case "notes": textBox5.Text = navigator.Value; break; } } while (navigator.MoveToNext()); navigator.MoveToParent(); } } while (navigator.MoveToNext()); } } The code should be familiar to you, because we used something similar in previous examples. The code loops through all the <employee> nodes and finds the one that matches the supplied employee ID. The values of various child nodes such as <firstname>, <lastname>, <homephone>, and <notes> are displayed in the respective text boxes by using the Value property of XPathNavigator.
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To add new nodes to the document, the XPathNavigator class provides a method called AppendChild(). The AppendChild() method returns an instance of XmlWriter, and by using this XmlWriter you can write additional nodes to the document. The newly written nodes are added as child nodes of the current node. Listing 4-14 shows how this is accomplished.
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CHAPTER 4 AC CES SING XML DOCUM ENTS BY USING THE XPATH DA TA MODEL
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Listing 4-14. Appending New Nodes private void button2_Click(object sender, EventArgs e) { navigator.MoveToRoot(); navigator.MoveToFirstChild(); while (navigator.MoveToNext()) { XmlWriter writer = navigator.AppendChild(); writer.WriteStartElement("employee"); writer.WriteAttributeString("employeeid", textBox1.Text); writer.WriteElementString("firstname", textBox2.Text); writer.WriteElementString("lastname", textBox3.Text); writer.WriteElementString("homephone", textBox4.Text); writer.WriteElementString("notes", textBox5.Text); writer.WriteEndElement(); writer.Close(); } } The code first navigates to the <employees> node. This is where we want to add a new <employee> child node. Then it calls the AppendChild() method of the XPathNavigator. The returned XmlWriter is used to add a new <employee> node with an employeeid attribute. The child nodes of the <employee> node (<firstname>, <lastname>, <homephone>, and <notes>) are also added. The methods such as WriteStartElement()and WriteEndElement() should already be familiar to you from 3.
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Note There are a few other overloads of the AppendChild() method. For example, one overloaded
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method accepts the complete XML markup fragment for the new node and appends it to the current node. However, the one that we used is more flexible.
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To modify contents of any of the nodes, the XPathNavigator class provides a method called SetValue(), which accepts the new value and assigns it to the current node. Listing 4-15 shows how this method can be used.
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CH APT ER 4 AC CE SSI NG XM L DO C UMENT S BY USI NG TH E XPAT H DA TA MO D EL
Listing 4-15. Modifying Content private void button3_Click(object sender, EventArgs e) { navigator.MoveToRoot(); navigator.MoveToFirstChild(); while (navigator.MoveToNext()) { navigator.MoveToFirstChild(); do { string id = navigator.GetAttribute("employeeid", ""); if (id == textBox1.Text) { navigator.MoveToFirstChild(); do { switch (navigator.Name) { case "firstname": navigator.SetValue(textBox2.Text); break; case "lastname": navigator.SetValue(textBox3.Text); break; case "homephone": navigator.SetValue(textBox4.Text); break; case "notes": navigator.SetValue(textBox5.Text); break; } } while (navigator.MoveToNext()); navigator.MoveToParent(); } } while (navigator.MoveToNext()); } }
CHAPTER 4 AC CES SING XML DOCUM ENTS BY USING THE XPATH DA TA MODEL
As before, the code finds out the <employee> node that is to be updated. The switch statement checks the Name property of XPathNavigator for the required node names (firstname, lastname, homephone, and notes). Inside each case, the SetValue() method is called on the navigator by passing the new value from the appropriate text box.
Deleting Nodes
Deleting a node is fairly simple. The DeleteSelf() method of XPathNavigator deletes the current node. After the node is successfully deleted, the cursor is moved to the parent node of the deleted node. Listing 4-16 shows the usage of DeleteSelf(). Listing 4-16. Deleting a Node private void button4_Click(object sender, EventArgs e) { navigator.MoveToRoot(); navigator.MoveToFirstChild(); while (navigator.MoveToNext()) { navigator.MoveToFirstChild(); do { string id = navigator.GetAttribute("employeeid", ""); if (id == textBox1.Text) { navigator.DeleteSelf(); } } while (navigator.MoveToNext()); } } As in the previous case, the code looks for a specific <employee> node. After it finds the node, it calls the DeleteSelf() method on the navigator.
Saving Changes
It is important to remember that while making any modifications via XPathNavigator, the changes are not saved automatically to disk. The changes affect only the DOM tree loaded in memory, so you need to save the underlying document by calling the Save() method of the XmlDocument class. This is illustrated in Listing 4-17.
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