public static void Main()
{
IShape[] shapes = new IShape[6];
shapes[0] = new Circle(1.12);
shapes[1] = new Circle(3.44);
shapes[2] = new Rectangle(34.4, 44);
shapes[3] = new Rectangle(11.4, 23);
shapes[4] = new Square(111.4, 12);
shapes[5] = new Square(34.4, 44);
foreach (var shape in shapes)
{
Type currentShapeType = shape.GetType();
string shapeName = currentShapeType == typeof (Square) ?
"Square" : currentShapeType == typeof (Rectangle) ?
"Rectangle" : "Circle";
Console.WriteLine("The area of the {0} is {1}. The perimeter is {2}",
shapeName, shape.CalculateArea(), shape.CalculatePerimeter());
}
}
static void Main(string[] args)
{
////Ack! Illegal to allocate interface types.
//IPointy p = new IPointy();//Compiler erro!
Console.WriteLine("****** Fun with Interfaces *****\n");
//Call Points property defined by IPointy.
Hexagon hex = new Hexagon();
Console.WriteLine("Points: {0}", hex.Points);
Console.WriteLine("*********");
//Catch a possible InvalidCastException.
Circle c = new Circle("Lisa");
IPointy itfPt = null;
try
{
itfPt = (IPointy)c;
Console.WriteLine(itfPt.Points);
}
catch (InvalidCastException e)
{
Console.WriteLine(e.Message);
}
//Can we treat hex2 as Ipointy?
Hexagon hex2 = new Hexagon("Peter");
IPointy itfPt2 = hex2 as IPointy;
if (itfPt2 != null)
{
Console.WriteLine("Points: {0}", itfPt2.Points);
}
else
{
Console.WriteLine("OOP! Not pointy...");
}
Console.WriteLine("****************************");
//Makes an array of Shapes.
Shape[] myShapes = { new Hexagon(), new Circle(), new Triangle("Joe"), new Circle("JoJo") };
for (int i = 0; i < myShapes.Length; i++)
{
//Recall the Shape base class defines an abstract Draw()
//member, so all shapes know how to draw themselves.
myShapes[i].Draw();
//Who's pointy?
if (myShapes[i] is IPointy)
{
Console.WriteLine("-> Points: {0}", ((IPointy)myShapes[i]).Points);
}
else
{
Console.WriteLine("->{0}\'s not pointy!", myShapes[i].PetName);
}
//Can I draw you in 3D?
if (myShapes[i] is IDraw3D)
{
DrawIn3D((IDraw3D)myShapes[i]);
}
}
Console.WriteLine("******************");
//Get First pointy item
//To be safe, you'd want to check firstPointyItem for null before proceeding.
IPointy firstPointyItem = FindFirstPointyShape(myShapes);
Console.WriteLine("The item has {0} points", firstPointyItem);
Console.ReadLine();
}
