static void Main(string[] args)
{
Shape[] myShapes = { new Triangle("Martin"), new Hexagon("Girl") };
foreach (Shape i in myShapes) {
i.Draw();
}
Hexagon hex = new Hexagon();
Console.WriteLine("Points: {0}", hex.Points);
// Three ways to check wheter a type supports a specific interface
// One way
Circle c = new Circle("Lisa");
IPointy itfPt = null;
try {
itfPt = (IPointy)c;
} catch (InvalidCastException ex) {
Console.WriteLine(ex.Message);
}
// Second way
Hexagon hex2 = new Hexagon("Peter");
IPointy itfPt2 = hex2 as IPointy;
if(itfPt2 != null)
Console.WriteLine("Points: {0}", itfPt2.Points);
else
Console.WriteLine("OOPS! Not pointy...");
// Third way
if (hex2 is IPointy)
Console.WriteLine("Points: {0}", itfPt2.Points);
else
Console.WriteLine("OOPS! Not pointy...");
// Interface as Parameters
Shape[] myShapes1= { new Hexagon(), new Circle(), new Triangle(), new ThreeDCircle("Jojo") };
for (int i = 0; i < myShapes1.Length; i++) {
// Can I draw you in 3D?
if (myShapes1[i] is IDraw3D<Shape>)
DrawIn3D((IDraw3D<Shape>)myShapes1[i]);
}
// -----------------------------------------------------------
// IEnumerable and IEnumerator
// -----------------------------------------------------------
// Any type supporting a method named GetEnumerator() can be evaluated by the foreach construct
BoxOfShapes myBox = new BoxOfShapes();
Console.WriteLine("***********IEnumerable and IEnumerable and IEnumerator ************");
foreach (Shape s in myBox) {
s.Draw();
}
// Last line
Console.ReadLine();
}
static void Main(string[] args) {
// IPointy p = new IPointy(); ERROR
Hexagon hex = new Hexagon();
Console.WriteLine("Points: {0}", hex.Points);
Circle c = new Circle("Lisa");
try {
IPointy cp = (IPointy)c;
Console.WriteLine("Points: {0}", cp.Points);
} catch (InvalidCastException ex) {
Console.WriteLine(ex);
}
Hexagon hex2 = new Hexagon("Peter");
IPointy itHex2 = hex2 as IPointy;
if (itHex2 != null) {
Console.WriteLine("Points: {0}", itHex2.Points);
} else {
Console.WriteLine("Oops, not a IPointy");
}
Console.WriteLine();
Shape[] shapes = { new Hexagon(), new Circle(), new Triangle("Joe"), new Circle("Jojo") };
foreach (Shape s in shapes) {
//s.Draw();
if (s is IDraw3D) {
DrawIn3D((IDraw3D)s);
} else {
s.Draw();
}
if (s is IPointy) {
Console.WriteLine("Points: {0}", ((IPointy)s).Points);
} else {
Console.WriteLine("{0} is not a IPointy", s.PetName);
}
}
Console.WriteLine();
IPointy firstPointyItem = FindFirstPointyShape(shapes);
Console.WriteLine("Points: {0}", firstPointyItem.Points);
Console.ReadLine();
}
static void Main(string[] args)
{
Hexagon hex = new Hexagon();
Console.WriteLine(hex.Points);
Circle c = new Circle();
IPointy itfPt = null;
try
{
itfPt = (IPointy)c;
Console.WriteLine(itfPt.Points);
}
catch (InvalidCastException ex)
{
Console.WriteLine(ex.Message);
}
Hexagon hex2 = new Hexagon();
IPointy itfPt2 = hex as IPointy;
if (itfPt2 != null)
{
Console.WriteLine(itfPt2.Points);
}
else
{
Console.WriteLine("Oops, not Pointy...");
}
Shape[] myShapes = { new Hexagon(), new Circle(), new ThreeDCircle(), new Triangle("Joe"), new Circle("JoJo") };
for (int i = 0; i < myShapes.Length; i++)
{
myShapes[i].Draw();
if (myShapes[i] is IPointy)
{
Console.WriteLine("-> Points: {0}", ((IPointy)myShapes[i]).Points);
}
else
{
Console.WriteLine("->{0}\'s not pointy!", myShapes[i].PetName);
}
}
Shape[] myShapes2 = { new Hexagon(), new Circle(), new Triangle(), new Circle("JoJo2") };
for (int b = 0; b < myShapes2.Length; b++)
{
if (myShapes2[b] is IDraw3D)
{
DrawIn3D((IDraw3D)myShapes2[b]);
}
}
IPointy firtPointInShapes = FindFirstPointyShape(myShapes);
Console.WriteLine("The item has {0} points", firtPointInShapes.Points);
Console.ReadLine();
}
static void Main(string[] args)
{
Console.WriteLine("***** Fun with Interfaces *****\n");
// Call Points property defined by IPointy.
Hexagon hex = new Hexagon();
Console.WriteLine("Points: {0}", hex.Points);
// 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);
}
// Catch using as
Hexagon hex2 = new Hexagon("Peter");
IPointy itfPt2 = hex2 as IPointy;
if (itfPt != null)
{
Console.WriteLine("Points: {0}", itfPt2.Points);
}
else
{
Console.WriteLine("OOPS! Not pointy...");
}
// Catch using is
// Make 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.Points);
Console.WriteLine();
// This array can only contain types that
// implement the IPointy interface.
IPointy[] myPointyObjects = { new Hexagon(), new Knife(), new Triangle(), new Fork(), new PitchFork() };
foreach (var i in myPointyObjects)
{
Console.WriteLine("Object has {0} points.", i.Points);
}
Console.ReadKey();
}
