static void Main(string[] args)
{
Guy joe1 = new Guy("Joe", 37, 100);
// True
Guy joe2 = joe1;
Console.WriteLine(ReferenceEquals(joe1, joe2));
Console.WriteLine(joe1.Equals(joe2));
Console.WriteLine(ReferenceEquals(null, null));
// False
joe2 = new Guy("Joe", 37, 100);
Console.WriteLine(ReferenceEquals(joe1, joe2));
Console.WriteLine(joe1.Equals(joe2));
// Now that Equals() and GetHashCode() are implemented in EquatableGuy, the following will work:
List<Guy> guys = new List<Guy>()
{
new Guy("Bob", 42, 125),
new EquatableGuy(joe1.Name, joe1.Age, joe1.Cash),
new Guy("ed", 39, 95)
};
// True
Console.WriteLine(guys.Contains(joe1));
// False
Console.WriteLine(joe1 == joe2);
// Object comparison with overwritten equals operators
joe1 = new EquatableGuyWithOverload(joe1.Name, joe1.Age, joe1.Cash);
joe2 = new EquatableGuyWithOverload(joe1.Name, joe1.Age, joe1.Cash);
// Below does not work as expected beause its calling Guy's == & != operators
// False
Console.WriteLine(joe1 == joe2);
// True
Console.WriteLine(joe1 != joe2);
// Cast to EquatableGuyWithOverload to call the correct == & !=
// True
Console.WriteLine((EquatableGuyWithOverload)joe1 == (EquatableGuyWithOverload)joe2);
// False
Console.WriteLine((EquatableGuyWithOverload)joe1 != (EquatableGuyWithOverload)joe2);
joe2.ReceiveCash(25);
// False
Console.WriteLine((EquatableGuyWithOverload)joe1 == (EquatableGuyWithOverload)joe2);
// True
Console.WriteLine((EquatableGuyWithOverload)joe1 != (EquatableGuyWithOverload)joe2);
// Now to make it work without casting
EquatableGuyWithOverload joe3 = new EquatableGuyWithOverload(joe1.Name, joe1.Age, joe1.Cash);
EquatableGuyWithOverload joe4 = new EquatableGuyWithOverload(joe1.Name, joe1.Age, joe1.Cash);
// True
Console.WriteLine(joe3 == joe4);
// False
Console.WriteLine(joe3 != joe4);
Console.ReadKey();
}