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[book] [en] Pro C# 2008 and the NET 3.5 Platform Fourth Edition

// Employee nests BenefitPackage.

public partial class Employee

{

// BenefitPackage nests BenefitPackageLevel.

public class BenefitPackage

{

public enum BenefitPackageLevel



{

Standard, Gold, Platinum

}

public double ComputePayDeduction()



{

return 125.0;

}

}

...



}

Because of the nesting relationships, note how we are required to make use of this

enumeration:

static void Main(string[] args)

{

...


// Define my benefit level.

Employee.BenefitPackage.BenefitPackageLevel myBenefitLevel =

Employee.BenefitPackage.BenefitPackageLevel.Platinum;

Console.ReadLine()

}

Excellent! At this point you have been exposed to a number of keywords (and concepts) that



allow you to build hierarchies of related types via classical inheritance, containment, and nested

C H A P T E R   6  



U N D E R S TA N D I N G   I N H E R I TA N C E  A N D   P O LY M O R P H I S M



198

8849CH06.qxd  10/1/07  10:35 AM  Page 198




types. If the details aren’t crystal clear at this point, don’t sweat it. You will be building a number of

additional hierarchies over the remainder of this text. Next up, let’s examine the final pillar of OOP:

polymorphism.


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