public void TestGetType()
{
var p = new Point();
Assert.AreEqual(p.GetType(), typeof(Point));
// class 'Type' has override "=="
Assert.True(p.GetType() == typeof(Point));
Assert.True(p is Point);
}
public static void Run() {
var p1 = new Point(10, 10);
var p2 = new Point(20, 20);
// p1 does NOT get boxed to call ToString (a virtual method)
Console.WriteLine(p1.ToString()); // (10, 10)
// p DOES get boxed to call GetType (a non-virtual method)
Console.WriteLine(p1.GetType()); // Point
// p1 does NOT get boxed to call CompareTo
// p2 does NOT get boxed because CompareTo(Point) is called
Console.WriteLine(p1.CompareTo(p2)); // -1
// p1 DOES get boxed, and the reference is placed in c
IComparable c = p1;
Console.WriteLine(c.GetType()); // Point
// p1 does NOT get boxed to call ComapreTo
// Since CompareTo is not being passed a Point variable,
// CompareTo(Object) is called which requires a reference to
// a boxed Point
// c does NOT get boxed because it already refers to a boxed Point
Console.WriteLine(p1.CompareTo(c)); // 0
// c does NOT get boxed because it is already refers ti a boxed Point.
// p2 DOES get boxed because CompareTo(Object) is called
Console.WriteLine(c.CompareTo(p2)); // -1
// c is unboxed, and fields are copied into p2
p2 = (Point)c;
// Proves that the fields got copied into p2
Console.WriteLine(p2.ToString()); // (10, 10)
}