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Listing 8-10. Deserializing Complex Types private void button2_Click(object sender, EventArgs e) { Employee emp; FileStream stream = new FileStream(Application.StartupPath + @"\employee.xml", FileMode.Open); XmlSerializer serializer = new XmlSerializer(typeof(Employee)); emp=(Employee)serializer.Deserialize(stream); stream.Close(); textBox1.Text = emp.EmployeeID.ToString(); textBox2.Text = emp.FirstName; textBox3.Text = emp.LastName; textBox4.Text = emp.HomePhone; textBox5.Text = emp.Notes; comboBox1.SelectedIndex = (emp.Type == EmployeeType.Permanent 0:1); textBox6.Text=emp.Address.Street; textBox7.Text=emp.Address.City; textBox8.Text=emp.Address.State; textBox9.Text=emp.Address.Country; textBox10.Text=emp.Address.PostalCode; textBox11.Text = string.Join(",", emp.Emails); stream.Close(); } The code is very much the same as in previous examples. It deserializes the previously serialized Employee object by using the XmlSerializer class. The property values are then assigned to various controls on the form. Notice how the Emails property is converted into a comma-separated string by using the Join() method of the string class. The following points are worth noting when serializing complex types: To serialize and deserialize enumerated values, the application that serializes the object and the application that deserializes it must define the same enumeration under consideration. While serializing object properties, all the public members of the object are serialized. The member names are assigned to the child elements in the resultant XML. During the deserialization process, XmlSerializer instantiates the main class (Employee) as well as all the subclasses (Address) and assigns values to the respective properties. While serializing arrays, an XML element represents the array. The individual array elements form the child element of this element. The individual array elements are enclosed in an element depending on the data type of the array. While deserializing, XmlSerializer creates an array with the same number of elements as the serialized elements. It then assigns the array element values accordingly.

Again only one channel is permitted by the standard. In this version, however, the <channel> element encompasses all of the subsequent items along with the channel s metadata:

M: Moves the draw heads to the point specified by two double values L: Draws a line to the point specified by two double values H: Draws a horizontal line to the point specified by a double value for its endpoint on x V: Draws a vertical line to the point specified by a double value for its endpoint on y C: Draws a cubic B zier curve between the current point and the endpoint specified

Rather more information about the channel is available in a 0.91 feed. As well as the title, link, and description, we are provided with an associated language and copyright information:

Serialization is not limited to simple and complex types. It is equally applicable to inherited classes. Assume that you have a class called Manager that inherits from our Employee class. Now when you serialize Manager, all the public properties of the Employee base class and Manager are serialized. This is also true in the case of a long chain of inheritance. To demonstrate how inherited classes are serialized, we need to add a class called Manager to our application. The Manager class inherits from the Employee class (see Listing 8-1) and extends it by adding an integer property NoOfSubordinates. The Manager class is shown in Listing 8-11. Listing 8-11. The Manager Class public class Manager:Employee { private int intNoOfSubordinates; public int NoOfSubordinates { get { return intNoOfSubordinates; } set { intNoOfSubordinates = value; } } } The code creates a class named Manager that inherits from the Employee class. It then adds a private integer variable to store the number of subordinates of a manager. The variable is exposed to the external world via a public property, NoOfSubordinates. To accommodate the additional property, the user interface of the application changes as shown in Figure 8-6. The application is almost the same as in Figure 8-1, but there is an extra text box for accepting the number of subordinates of the manager. Listing 8-12 shows the Click event handler of the Serialize button.

by six double values, which specify the x and y points of the two control points of the curve and the endpoint for the curve

<title>PortalBook Technical Notes</title> <link>http://portalbook.com/</link> <description> Discourse and exposition on Java and developing Portlets </description>

Figure 8-6. Application to demonstrate serialization of inherited classes Listing 8-12. Serializing the Inherited Manager Class private void button1_Click(object sender, EventArgs e) { Manager manager = new Manager(); manager.EmployeeID = int.Parse(textBox1.Text); manager.FirstName = textBox2.Text; manager.LastName = textBox3.Text; manager.HomePhone = textBox4.Text; manager.Notes = textBox5.Text; manager.NoOfSubordinates = int.Parse(textBox6.Text); FileStream stream = new FileStream(Application.StartupPath + @"\employee.xml", FileMode.Create); XmlSerializer serializer = new XmlSerializer(typeof(Manager)); serializer.Serialize(stream, manager); stream.Close(); if (checkBox1.Checked) { Process.Start(Application.StartupPath + @"\employee.xml"); } }

9

Q: Draws a quadratic B zier curve between the current point and the endpoint, speci-

<language>en-us</language> <copyright> Copyright: (C) 2003 Dave Minter and Jeff Linwood </copyright>