//使用方法參數ref,採傳址呼叫
 static void ShowMsg(ref ModifyScore one)
 {
     //重新建立一個物件,指定名字和分數
     one      = new ModifyScore();
     one.Name = "Peter";
     one.Mark = 73;
 }
        //主程式
        static void Main(string[] args)
        {
            ModifyScore jan = new ModifyScore(); //建立物件

            jan.Name = "Janet";
            jan.Mark = 95;

            ShowMsg(ref jan); //以物件做傳遞對象

            Console.WriteLine($"{jan.Name}, 分數 {jan.Mark}");

            Console.ReadKey(); //螢幕暫停
        }