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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.

Redirecting is like piping, except that the output is passed to a file rather than to another command Redirecting can also work the other way: the contents of a file can be passed to a command If you wanted to create a file that contained a directory listing, you could type this: ls -l > directorylistingtxt The angle bracket (>) between the commands tells BASH to direct the output of the ls -l command into a file called directorylistingtxt If a file with this name exists, it s overwritten with new data If it doesn t exist, it s created from scratch You can add data to an already existing file by using two angle brackets: ls -l >> directorylistingtxt This will append the result of the directory listing to the end of the file called directorylisting.

txt, although, once again, if the file doesn t exist, it will be created from scratch Redirecting output can get very sophisticated and useful Take a look at the following: cat myfile1txt myfile2txt > myfile3txt As you learned in 12, the cat command joins two or more files together If the command were used on its own without the redirection, it would cause BASH to print myfile1txt on the screen, immediately followed by myfile2txt As far as BASH is concerned, it has joined myfile1txt to myfile2txt and then sent them to standard output (the screen) By specifying a redirection, you have BASH send the output to a third file Using cat with redirection is a handy way of combining two files It s also possible to direct the contents of a file back into a command.

Figure 20-10. Design view of the form 16. Double-click the Button control to go to Code view. Before proceeding with adding the code for the button s click event, add the following namespace to the project: Imports System.Data.EntityClient

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.