Example of dymamic dispatch, double dispatch and multiple dispatch

main.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            //DynamicDispatch();
            DoubleDispatch();
            //MultipleDispatch();
        }

        public static void MultipleDispatch()
        {
            Animal a = GetMeAnAnimal();

            a.DieByMutiple(new Weapon());
        }

        private static void DoubleDispatch()
        {
            Animal a = GetMeAnAnimal();
            Weapon weapon = GetMeAWeapon();

            // Here the weapon overload is the only possible choice as the type resolution is decided at compile time.
            a.DieBy(weapon);
        }

        private static void MultipleDispatch2()
        {
            Animal a = GetMeAnAnimal();
            Weapon weapon = GetMeAWeapon();

            // Using dynamic here will allow the overloaded sword method to be called as the type resolution is moved to run time
            a.DieBy((dynamic)weapon);
        }

        private static Sword GetMeAWeapon()
        {
            return new Sword();
        }

        private static void DynamicDispatch()
        {
            Animal a = GetMeAnAnimal();
            a.Die();
        }

        private static Animal GetMeAnAnimal()
        {
            return new Animal();
        }
    }

    class Weapon
    {
        public virtual void Kill(Animal a)
        {
            Console.WriteLine("I'm killing an animal");
            a.Die();
        }

        public virtual void Kill(Simone a)
        {
            Console.WriteLine("I'm killing an the grumpy guy");
            a.Die();
        }
    }

    class Sword : Weapon
    {
    }

    class Animal
    {
        public virtual void Die()
        {
            Console.WriteLine("OMG, I'm dying!");
        }

        public virtual void DieBy(Weapon weapon)
        {
            weapon.Kill(this);
        }

        public virtual void DieBy(Sword s)
        {
            s.Kill(this);
        }

        public void DieByMutiple(Weapon weapon)
        {
            weapon.Kill((dynamic)this);
        }
    }

    class Simone : Animal
    {
        public override void Die()
        {
            Console.WriteLine("Oh Myyyyyyy Gawd!");
        }

        public override void DieBy(Weapon weapon)
        {
            weapon.Kill(this);
        }
    }
}