Object Oriented Programming using C#

Object Oriented Programming using C#

Object Roles and the Importance of Polymorphism

Note that (myDiscMag is Magazine) would be TRUE because a DiscMag is a Magazine

is can also be used with an interface name on the right, in which case it tests whether the class implements the interface.

Strictly is is testing whether the item on the left is of the type, or a subtype of, the type specified on the right. Doing this

we could extend the CashTill class such that it displays a specific message depending upon the object sold.

public void SaleType (ISaleableItem pSI)

{

if (pSI is Publication)

{

Console.WriteLine(“This is a Publication”);

}

else if (pSI is Ticket)

{

Console.WriteLine (“This is a Ticket”);

}

else

{

Console.WriteLine (“This is a an unknown sale type”);

}

}

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