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The application consists of a TreeView control and a Button control. Clicking the Load Tree button displays the entire tree of nodes in the tree view as shown. The core logic goes in the Click event handler of the Load Tree button and is shown in Listing 3-2. Listing 3-2. Loading the Tree private void button1_Click(object sender, EventArgs e) { XmlTextReader reader = new XmlTextReader(Application.StartupPath + @"\employees.xml"); reader.WhitespaceHandling = WhitespaceHandling.None; TreeNode employeenode=null; TreeNode rootnode = null; while (reader.Read()) { if (reader.NodeType == XmlNodeType.Element) { if (reader.Name == "employees") { rootnode = treeView1.Nodes.Add("Employees"); } if (reader.Name == "employee") { string employeeid = reader.GetAttribute("employeeid"); employeenode = new TreeNode("Employee ID :" + employeeid); rootnode.Nodes.Add(employeenode); } if (reader.Name == "firstname") { string firstname = reader.ReadElementString(); TreeNode node = new TreeNode(firstname); employeenode.Nodes.Add(node); }

using System.IO; using System.Text; using System.Xml.Linq; 3. Open MainPage.xaml.cs and paste the UploadPhoto function written here. This will be the only function that will be invoked when the photo upload needs to take place. This function sets the URL and the type of the request, and then it invokes the asynchronous BeginGetRequestStream, which packages the photo and the user credentials.

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if (reader.Name == "lastname") { reader.Read(); string lastname = reader.Value; TreeNode node = new TreeNode(lastname); employeenode.Nodes.Add(node); } if (reader.Name == "homephone") { string homephone = reader.ReadElementString(); TreeNode node = new TreeNode(homephone); employeenode.Nodes.Add(node); } if (reader.Name == "notes") { string notes = reader.ReadElementString(); TreeNode node = new TreeNode(notes); employeenode.Nodes.Add(node); } } reader.Close(); } The code creates an instance of the XmlTextReader class by passing the path of the XML file. The WhitespaceHandling property of XmlTextReader governs the behavior of the reader while reading white space. This property is an enumeration of type WhitespaceHandling and has three possible values: All, None, or Significant. We set WhitespaceHandling to ignore any white space. This will simplify our coding. A while loop repeatedly calls the Read() method of XmlTextReader. The Read() method reads the next node from the file and returns true if the next node can be read successfully; otherwise, it returns false. Inside the while loop, the code retrieves the type of node by using the NodeType property of the XmlTextReader class. The NodeType property is an enumeration of type XmlNodeType and can have values such as Attribute, CDATA, Comment, Element, EndElement, Text, Whitespace, SignificantWhitespace, and so on. Note that the start and end elements are represented separately. This is because while scanning the document the XmlTextReader class reads start elements (for example, <employee>) and end elements (for example, </employee>) separately. In our example, we are interested only in start elements and therefore the if condition checks only for a node type of Element.

Figure 5-11. Game screen with a Found an available session message In the next section, you ll see how to find sessions asynchronously.

public void UploadPhoto() { HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://twitpic.com/api/upload"); request.ContentType = "application/x-www-form-urlencoded"; request.Method = "POST"; request.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), request); }

The code then checks the name of each element. This is done by checking the Name property of the XmlTextReader class and executing code depending on the element name: If the element name is employees, the code adds the root node of the TreeView control. If the element name is employee, the code retrieves the employeeid attribute. To retrieve attribute values, XmlTextReader provides a method called GetAttribute(), which accepts the name of the attribute whose value is to be retrieved and returns the value as a string. A tree node is then added for this employee. If the element name is firstname, the text value inside it needs to be retrieved. This is done with the help of the ReadElementString() method, which returns the text content within the current element. For us it will return the first name of the employee. The next if condition contains a variation on reading element values. It also illustrates the cursor-oriented model of XmlTextReader. When this if condition is triggered, the XmlTextReader is pointing to the <lastname> element. When we call the Read() method again, the cursor moves to the text node inside the <lastname> element. The Value property of XmlTextReader then returns the value of the text node. The values of the homephone and notes elements are read along the same lines. Finally, the XmlTextReader is closed by using its Close() method.

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