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// We now support a custom property to return

// the correct IComparer interface.

public class Car : IComparable

{

...

// Property to return the SortByPetName comparer.

public static IComparer SortByPetName

{

get {  return (IComparer)new PetNameComparer(); }  }

}

The object user code can now sort by pet name using a strongly associated property, rather

than just “having to know” to use the stand-alone PetNameComparer class type:

// Sorting by pet name made a bit cleaner.

Array.Sort(myAutos, Car.SortByPetName);

■

Source Code

The ComparableCar project is located under the Chapter 9 subdirectory.

Hopefully at this point, you not only understand how to define and implement interface types,

but can understand their usefulness. To be sure, interfaces will be found within every major .NET

namespace. To wrap up this chapter, let’s check out the interfaces that can be used to enable call-

back mechanisms.