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// Attempt to get IPointy from array of ints.

int[] myInts = {10, 20, 30};

IPointy itfPt = ExtractPointyness(myInts);

if(itfPt != null)

Console.WriteLine("Object has {0} points.", itfPt.Points);

else

Console.WriteLine("This object does not implement IPointy");

Console.ReadLine();

}

Arrays of Interface Types

Recall that the same interface can be implemented by numerous types, even if they are not within

the same class hierarchy and do not have a common parent class beyond System.Object. This can

yield some very powerful programming constructs. For example, assume that you have developed

three new class types within your current project modeling kitchen utensils (via Knife and Fork

classes) and another modeling gardening equipment (à la PitchFork). Consider Figure 9-6.

Figure 9-6.

Recall that interfaces can be “plugged into” any type in any part of a class hierarchy.

If you did define the PitchFork, Fork, and Knife types, you could now define an array of

IPointy-compatible objects. Given that these members all support the same interface, you are able

to iterate through the array and treat each item as an IPointy-compatible object, regardless of the

overall diversity of the class hierarchies:

static void Main(string[] args)

{

...