class Program
    {
        [STAThread]
        static void Main(string[] args)
        {
            //方法名当成参数传给委托类型调用
            MarkGreeting("张三", GreetingEnglish);
            MarkGreeting("李四", GreetingChinese);
        }

        /// <summary>
        /// 委托(代理的方法)
        /// </summary>
        /// <param name="name"></param>
        /// <param name="markGreeting"></param>
        private static void MarkGreeting(string name, DoGreeting markGreeting)
        {
            markGreeting(name);
        }

        /// <summary>
        /// 用英文打招呼
        /// </summary>
        /// <param name="name"></param>
        private static void GreetingEnglish(string name)
        {
           Console.WriteLine(name+"hello!");
        }

        /// <summary>
        /// 用中文打招呼
        /// </summary>
        /// <param name="name"></param>
        private static void GreetingChinese(string name)
        {
            Console.WriteLine(name+"你好!");
        }
    }

    public class Greeting
    {
        /// <summary>
        /// 委托(代理的方法)
        /// </summary>
        /// <param name="name"></param>
        /// <param name="markGreeting"></param>
        public void MarkGreeting(string name, DoGreeting markGreeting)
        {
            markGreeting(name);
        }

        /// <summary>
        /// 用英文打招呼
        /// </summary>
        /// <param name="name"></param>
        public  void GreetingEnglish(string name)
        {
            Console.WriteLine(name + "hello!");
        }

        /// <summary>
        /// 用中文打招呼
        /// </summary>
        /// <param name="name"></param>
        public void GreetingChinese(string name)
        {
            Console.WriteLine(name + "你好!");
        }
    }

    class Program
    {
        [STAThread]
        static void Main(string[] args)
        {
            Greeting greetingObj = new Greeting();

            greetingObj.MarkGreeting("张三", greetingObj.GreetingEnglish);
            greetingObj.MarkGreeting("李四", greetingObj.GreetingChinese);

        }