装箱、拆箱练习
【示例代码】
1 using System; 2 //Point is a Value Type 3 internal struct Point { 4 private Int32 m_x, m_y; 5 6 public Point(Int32 x,Int32 y){ 7 m_x = x; 8 m_y = y; 9 } 10 11 public void Change(Int32 x, Int32 y){ 12 m_x = x; 13 m_y = y; 14 } 15 16 public override String ToString(){ 17 return String.Format("({0}, {1})",m_x, m_y); 18 } 19 20 public sealed class Program { 21 public static void Main(){ 22 Point p = new Point(1, 1); 23 24 Console.WriteLine(p); //1,1 有装箱操作Console.WriteLine(Object) 25 26 p.Change(2, 2); 27 Console.WriteLine(p); //2,2 有装箱操作Console.WriteLine(Object) 28 29 Object o = p; //有装箱操作 30 Console.WriteLine(o); //2,2 无装箱 31 32 ((Point) o).Change(3, 3); //拆箱并将Point对象复制到栈上临时变量中，并执行Change方法 33 Console.WriteLine(o); //2,2 34 } 35 } 36 }
