学步园

static void Main(string[] args)
        {
            SayHello("tom",10);
            SayHello("jim");
            Console.ReadKey();
        }

        /*
        public static void SayHello(string name, int age)
        {
            Console.WriteLine("你?好?，?我ò是?{0}，?我ò的?年ê龄?是?{1}",name,age);
        }

        public static void SayHello(string name)
        {
            SayHello(name, 20);
        }*/ 此部分为.NET 4.0以前的实现方式

        public static void SayHello(string name, int age=20)
        {
            Console.WriteLine("你?好?，?我ò是?{0}，?我ò的?年ê龄?是?{1}", name, age);
        }

//此部分为.NET 4.0的新特性