C# Pattern Command test

using System;

namespace PatternTest
{
    interface ICommand { }

    class Move : ICommand
    {
        public int dx { get; set; }
        public int dy { get; set; }
    }

    class FullScreen : ICommand { }

    class Exit : ICommand { }

    class Program
    {
        static void Main(string[] args)
        {

            int player_x = 0;
            int player_y = 0;

            ICommand myCommand = new Move { dx = -1, dy = 0 };

            switch (myCommand) {
                case Move m:
                    player_x += m.dx;
                    player_y += m.dy;
                    break;
                case FullScreen _:
                    // toggle full screen
                    break;
                case Exit _:
                    // quit game nicely
                    break;

            }

            Console.WriteLine("Hello World!");
        }
    }
}