//Inheritance and objects
private void button1_Click(object sender, EventArgs e)
{
try
{
Person objP1;
/* You cannot make a person object when the class is marked abstract. */
//objP1 = new Person();
/* But, can you make a variable of the abstract class that points to a object? */
objP1 = new Employee();
//or
objP1 = new Customer();
//This connects the event to a method
objP1.NameChanged += new EventHandler(objP1_NameChanged);
//Set the properties
objP1.Name = "Bob Smith";
objP1.DOB = Convert.ToDateTime("01/01/1980");
objP1.Gender = Gender.Male;
//Use a method
MessageBox.Show(objP1.GetData());
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
//a more typical way to create employee objects
private void button3_Click(object sender, EventArgs e)
{
Employee objE1 = new Employee();
objE1.EmployeeId = 1;
objE1.Name = "Tim Thomas";
objE1.DOB = DateTime.Parse("1/1/1980");
objE1.Gender = Gender.Male;
MessageBox.Show(objE1.GetData());
Employee objE2 = new Employee(2, "Jill James", DateTime.Parse("1/2/1990"), Gender.Female);
MessageBox.Show(objE2.GetData());
}
// Creating an array of objects with a parent class variable
private void button4_Click(object sender, EventArgs e)
{
Customer objC1 = new Customer();
objC1.CustomerId = 1;
objC1.Name = "Sue Jones";
objC1.DOB = DateTime.Parse("1/1/1980");
objC1.Gender = Gender.Female;
Employee objE1 = new Employee();
objE1.EmployeeId = 1;
objE1.Name = "Tim Thomas";
objE1.DOB = DateTime.Parse("1/1/1980");
objE1.Gender = Gender.Male;
Person[] arrPersons = { objC1, objE1 };
foreach (Person item in arrPersons)
{
MessageBox.Show(item.GetData());
}
}