使用接口改變已經裝箱的值類型的字段。
using?System;
using?System.Collections.Generic;
using?System.Text;

namespace?App1
{
????struct?Point
????{
????????public?Int32?x,?y;
????????public?void?Change(Int32?x,?Int32?y)
????????{
????????????this.x?=?x;
????????????this.y?=?y;
????????}
????????public?override?string?ToString()
????????{
????????????//return?base.ToString();
????????????return?string.Format("{0},{1}",?x,?y);
????????????//return?string.Format("{0},{1},{2}",?x,?y,?x);
????????}
????}
????class?Program
????{
????????static?void?Main(string[]?args)
????????{
????????????Point?p?=?new?Point();
????????????p.x?=?p.y?=?1;
????????????Console.WriteLine(p);
????????????//調用p的ToString()方法,若不override---ToString()則輸出"App1.Point"
????????????/**////
????????????p.Change(2,?2);
????????????Console.WriteLine(p);
????????????/**////
????????????object?o?=?p;//p裝箱
????????????Console.WriteLine(o);//o指向裝箱后的p---(2,2)
????????????/**///
????????????((Point)o).Change(3,?3);//把o拆箱到臨時棧上,并在臨時棧上改變Point的值成(3,3)
????????????Console.WriteLine(o);//輸出原來o指向的對象的值:(2,2)
????????????Console.Read();
????????}
????}
}
****************************************
using?System;
using?System.Collections.Generic;
using?System.Text;

namespace?App1
{
????interface?IChangeBoxedPoint
????{
????????void?Change(Int32?x,?Int32?y);
????}
????struct?Point:IChangeBoxedPoint
????{
????????public?Int32?x,?y;
????????//現在該Change方法成了實現的接口的方法
????????public?void?Change(Int32?x,?Int32?y)
????????{
????????????this.x?=?x;
????????????this.y?=?y;
????????}
????????public?override?string?ToString()
????????{
????????????//return?base.ToString();
????????????return?string.Format("{0},{1}",?x,?y);
????????????//return?string.Format("{0},{1},{2}",?x,?y,?x);
????????}
????}
????class?Program
????{
????????static?void?Main(string[]?args)
????????{
????????????Point?p?=?new?Point();
????????????p.x?=?p.y?=?1;
????????????Console.WriteLine(p);
????????????//調用p的ToString()方法,若不override---ToString()則輸出"App1.Point"
????????????/**////
????????????p.Change(2,?2);
????????????Console.WriteLine(p);
????????????/**////
????????????object?o?=?p;//p裝箱
???????????
????????????Console.WriteLine(o);//o指向裝箱后的p---(2,2)
????????????/**///
????????????((Point)o).Change(3,?3);//把o拆箱到臨時棧上,并在臨時棧上改變Point的值成(3,3)
????????????Console.WriteLine(o);//輸出原來o指向的對象的值:(2,2)
????????????/**////
????????????((IChangeBoxedPoint)p).Change(4,4);//把p裝箱,改變已裝箱對象,隨后將之丟棄
????????????Console.WriteLine(p);//輸出p(2,2)
????????????/**///
????????????((IChangeBoxedPoint)o).Change(5,?5);//這里o本身即是已裝箱的對象,把它改變
????????????Console.WriteLine(o);//輸出剛剛被改變的o(5,5)

????????????Console.Read();
????????}
????}
}

轉載于:https://www.cnblogs.com/shuang/archive/2007/12/20/1007215.html

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