//default behavior of .net (reference equality)
static void DisplayWetherEqual(Food2 food1, Food2 food2)
{
if (food1 == food2)
{
Console.WriteLine(string.Format("{0,12} == {1}", food1, food2));
}
else
{
Console.WriteLine(string.Format("{0,12} != {1}", food1, food2));
}
}
{ /*main for value equality --> Food.cs
* static void Main(string[] args)
* {
* FoodItem banana = new FoodItem("banana", FoodGroup.Fruit);
* FoodItem banana2 = new FoodItem("banana", FoodGroup.Fruit);
* FoodItem chocolate = new FoodItem("chocolate", FoodGroup.Sweets);
* //true
* Console.WriteLine("banana == banana2 " + (banana == banana2));
* //false
* Console.WriteLine(" banana2 == chocolate " + (banana2 == chocolate));
* //false
* Console.WriteLine("chocolate == banana " + (chocolate == banana));
* //true
* Console.WriteLine("HashCode is equal for banana1&2? " + (banana.GetHashCode() == banana2.GetHashCode()));
* }*/
//main for reference equality
static void Main(string[] args)
{
Food2 apple = new Food2("apple", FoodGroup.Fruit);
CookedFood stewedApple = new CookedFood("stewed", "apple", FoodGroup.Fruit);
CookedFood bakedApple = new CookedFood("baked", "apple", FoodGroup.Fruit);
CookedFood stewedApple2 = new CookedFood("stewed", "apple", FoodGroup.Fruit);
Food2 apple2 = new Food2("apple", FoodGroup.Fruit);
DisplayWetherEqual(apple, stewedApple);
DisplayWetherEqual(stewedApple, bakedApple);
DisplayWetherEqual(stewedApple, stewedApple2);
DisplayWetherEqual(apple, apple2);
DisplayWetherEqual(apple, apple);
}
public override bool Equals(object obj)
{
if (obj == null)
{
return(false);
}
if (ReferenceEquals(obj, this))
{
return(true);
}
if (obj.GetType() != this.GetType())
{
return(false);
}
Food2 rhs = obj as Food2;
return(this._name == rhs._name && this._group == rhs._group);
}