decorator_0.cs

using System;

namespace decorator_0
{
    class Program
    {
        static void Main(string[] args)
        {
            var msg = "I love C-sharp";
            var simpleMsg = new SimpleMessage(msg);
            var excitedMsg = new ExcitedMessage(msg);
            var quizzicalMsg = new QuizzicalMessage(msg);
            var excitedAndQuizzicalMsg = new ExcitedAndQuizzicalMessage(msg);

            SimpleMessage[] messages = { simpleMsg, excitedMsg, quizzicalMsg, excitedAndQuizzicalMsg };
            foreach (SimpleMessage m in messages)
            {
                m.PrintMessage();
            }
                // I love C-sharp
                // I love C-sharp!!!
                // I love C-sharp???
                // I love C-sharp!!!???
        }
    }

    public class SimpleMessage
    {
        private string Content;

        public SimpleMessage(string content)
        {
            this.Content = content;
        }

        public string GetMessage()
        {
            return this.Content;
        }

        public void PrintMessage()
        {
            Console.WriteLine(this.GetMessage());
        }
    }

    public class ExcitedMessage : SimpleMessage
    {
        public ExcitedMessage(string content)
            : base(content + "!!!") {}
    }

    public class QuizzicalMessage : SimpleMessage
    {
        public QuizzicalMessage(string content)
            : base(content + "???") { }
    }

    public class ExcitedAndQuizzicalMessage : SimpleMessage
    {
        public ExcitedAndQuizzicalMessage(string content)
            : base(content + "!!!???") { }
    }
}