//Classic sample of Polymorphism 4 Knowing When to Use Override and New Keywords
public static void ScenarioEight()
{
Teacher baseTeacher = new Teacher();
baseTeacher.ShowMeDance();
System.Console.WriteLine("----------");
NewStyleTeacher newStyleTeacher = new NewStyleTeacher();
newStyleTeacher.ShowMeDance(); //go to the new
newStyleTeacher.Dance(); ///go to the new
System.Console.WriteLine("----------");
BachataTeacher bachataTeacher = new BachataTeacher();
bachataTeacher.ShowMeDance(); //go to base
System.Console.WriteLine("----------");
StupidTeacher stupidTeacher = new StupidTeacher();
stupidTeacher.ShowMeDance(); //go to the old
// Keep the console open in debug mode.
Console.WriteLine("Press any key to exit.");
Console.ReadKey();
}
//Calls with cast implicit Knowing When to Use Override and New Keywords
// "new" keyword is specified, the compiler will issue a warning and the method
//in the derived class will hide the method in the base class.
public static void ScenarioNine()
{
var derived = new NewStyleTeacher();
derived.Dance();
((Teacher)derived).Dance(); //Call old method-----new
System.Console.WriteLine("----------");
var derived2 = new BachataTeacher();
derived2.Dance();
((Teacher)derived2).Dance(); //Call new method-----------override
// Keep the console open in debug mode.
Console.WriteLine("Press any key to exit.");
Console.ReadKey();
}
//Classic sample of Polymorphism 2
// Virtual methods and properties enable derived classes to extend a base class without
// needing to use the base class implementation of a method
public static void ScenarioFive()
{
BachataTeacher B = new BachataTeacher();
B.Dance(); // Calls the new method.
Teacher A = (Teacher)B;
A.Dance(); // Also calls the new method.
Teacher D = new BachataTeacher();
D.Dance(); // Also calls the new method.
// Keep the console open in debug mode.
Console.WriteLine("Press any key to exit.");
Console.ReadKey();
}