using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

class Program

    {

        static void Main(string[] args)

        {

            Tester t = new Tester( );

            t.Run( );

        }

    }

​

​

    public class MediaStorage

    {

        public delegate int PlayMedia( );

​

        public void ReportResult(PlayMedia playerDelegate)

        {

            if (playerDelegate( ) == 0)

            {

                Console.WriteLine("Media played successfully.");

            }

            else

            {

                Console.WriteLine("Media did not play successfully.");

            }

        }

    }

​

    public class AudioPlayer

    {

        private int audioPlayerStatus;

​

        public int PlayAudioFile( )

        {

            Console.WriteLine("Simulating playing an audio file here.");

            audioPlayerStatus = 0;

            return audioPlayerStatus;

        }

    }

​

    public class VideoPlayer

    {

        private int videoPlayerStatus;

​

        public int PlayVideoFile( )

        {

            Console.WriteLine("Simulating a failed video file here.");

            videoPlayerStatus = -1;

            return videoPlayerStatus;

        }

    }

​

    public class Tester

    {

        public void Run( )

        {

            MediaStorage myMediaStorage = new MediaStorage( );

​

            // instantiate the two media players

            AudioPlayer myAudioPlayer = new AudioPlayer( );

            VideoPlayer myVideoPlayer = new VideoPlayer( );

​

            // instantiate the delegates

            MediaStorage.PlayMedia audioPlayerDelegate = new 

                   MediaStorage.PlayMedia(myAudioPlayer.PlayAudioFile);

            MediaStorage.PlayMedia videoPlayerDelegate = new 

                   MediaStorage.PlayMedia(myVideoPlayer.PlayVideoFile);

​

            // call the delegates

            myMediaStorage.ReportResult(audioPlayerDelegate);

            myMediaStorage.ReportResult(videoPlayerDelegate);

        }

    }

​

​

​