/// <summary>  
    /// 電視機  
    /// </summary>  
    public class Television
    {
        /// <summary>  
        /// 模式是關閉的  
        /// </summary>  
        bool isopen = false;
        /// <summary>  
        /// 切換關閉、打開  
        /// </summary>  
        public string Switch()
        {
            if (isopen)
            {
                isopen = false;
                return "關閉電視機";
            }
            else
            {
                isopen = true;
                return "打開電視機";

            }
        }

    }

    /// <summary>  
    /// 命令接口  
    /// </summary>  
    public interface CommandInterface
    {
        /// <summary>  
        /// 執行命令  
        /// </summary>  
        string Execute();
    }

    /// <summary>  
    /// 電視機命令對象  
    /// </summary>  
    public class TeleisionCommand : CommandInterface
    {
        /// <summary>  
        /// 電視機對象  
        /// </summary>  
        private Television Tv = new Television();
        #region CommandInterface 成員  
        /// <summary>  
        /// 執行命令  
        /// </summary>  
        public string Execute()
        {
            return Tv.Switch();
        }

        #endregion
    }

    /// <summary>  
    /// 控制中心  
    /// </summary>  
    public static class ControlContent
    {
        private static CommandInterface Command;
        public static void SetControlObjectCommand(CommandInterface cobject)
        {
            Command = cobject;
        }
        public static string ExecuteControlObject()
        {
            return Command.Execute();
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            TeleisionCommand tvcommand = new TeleisionCommand();

            ControlContent.SetControlObjectCommand(tvcommand);
            Console.WriteLine(ControlContent.ExecuteControlObject());
            Console.WriteLine(ControlContent.ExecuteControlObject());
            Console.ReadLine();
        }
    }