单例模式

 class Program
    {
        static void Main(string[] args)
        {     //比较2个对象是否相等
            Singleton s1 = Singleton.Instance();
            Singleton s2 = Singleton.Instance();

            if (s1 == s2)
            {

                Console.Write("Objects are the same Instance");
            }
            Console.Read();

        }
    }
     //单例
    class Singleton
    {
        private static Singleton instance;
         //构造器
        protected Singleton()
        {


        }
         //对象初始化
        public static Singleton Instance()
        {   
            if (instance == null)
            {
                instance = new Singleton();
            }
            return instance;

        }



    }