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static IPointy FindFirstPointyShape(Shape[] shapes) { foreach (var s in shapes) { if (s is IPointy) { return s as IPointy; } } return null; } |
In Main
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Shape[] shapes = { new Triangle("Triangle"), new Hexagon("Hexagon"), new Circle("Circle") }; IPointy firstPointyItem = FindFirstPointyShape(shapes); Console.WriteLine("Item has {0} points", firstPointyItem.Points); |