Can you explain Liskov Substitution Principle with a good C# example? [closed]

Answer 1

Here's the code for applying Liskov Substitute Principle.

public abstract class Fruit
{
    public abstract string GetColor();
}

public class Orange : Fruit
{
    public override string GetColor()
    {
        return "Orange Color";
    }
}

public class Apple : Fruit
{
    public override string GetColor()
    {
        return "Red color";
    }
}

class Program
{
    static void Main(string[] args)
    {
        Fruit fruit = new Orange();

        Console.WriteLine(fruit.GetColor());

        fruit = new Apple();

        Console.WriteLine(fruit.GetColor());
    }
}

LSV states: "Derived classes should be substitutable for their base classes (or interfaces)" & "Methods that use references to base classes (or interfaces) have to be able to use methods of the derived classes without knowing about it or knowing the details."