装箱和拆箱

class Program
    {
        static void Main(string[] args)
        {
            int num = 10;
            //下边是装箱,是在堆中开辟一个空间存储num,不是简单的赋值
            object o = num;
            //下边是拆箱,就是从堆中把数据取出来,在转化赋值给栈中的num2
            int num2 = (int)o;

            Mys s=new Mys();
            Myc c=new Myc();
            s.num1 = 10;
            s.myc = new Myc();
            s.myc.num2 = 10;
            //装箱
            object oi = s;
            s.num1=20;
            s.myc.num2=20;
           // 拆箱
            Mys s1=(Mys)oi;
            Console.WriteLine("si.num1:{0}
s1.myc.num2:{1}", s1.num1, s1.myc.num2);
            Console.ReadKey();

        }
    }
    struct Mys
    {
       public int num1;
       public Myc myc;
    }
    class Myc
    {
        public int num2;
    }

图解