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// A generic way to compare two objects.

interface IComparer

{

int Compare(object o1, object o2);

}

Unlike the IComparable interface, IComparer is typically not implemented on the type you are

trying to sort (i.e., the Car). Rather, you implement this interface on any number of helper classes,

one for each sort order (pet name, car ID, etc.). Currently, the Car type already knows how to com-

pare itself against other cars based on the internal car ID. Therefore, allowing the object user to sort

an array of Car types by pet name will require an additional helper class that implements IComparer.

Here’s the code:

C H A P T E R   9  

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