using System;
using System.Linq;
class Program
{
static void Main()
{
//~ 以下测试是使结构体s2=s1，然后修改s2的数据，观察对s1的影响
var s1=new S1();
s1.Title="I'm s1";
s1.firstPoint=new Point(0,0);
s1.otherPoint=new Point[]{new Point(1,1),new Point(2,2)};
//~ 直接赋值，使s2=s1
//~ 显示数据完成相同
Console.WriteLine("TEST 1:");
var s2=s1;
Console.WriteLine("s1: "+s1);
Console.WriteLine("s2: "+s2);
Console.WriteLine();
//~ 直接修改s2的值类型数据(firstPoint)和引用类型数据(otherPoint)
//~ 值类型数据的改变不影响s1，引用类型数据的改变影响s1
Console.WriteLine("TEST 2:");
s2=s1;
Console.WriteLine("s1: "+s1);
s2.Title="I'm s2";
s2.firstPoint.x=50;
s2.firstPoint.y=50;
s2.otherPoint[0].x=150;
s2.otherPoint[0].y=150;
s2.otherPoint[1].x=250;
s2.otherPoint[1].y=250;
Console.WriteLine("s2: "+s2);
Console.WriteLine("s1: "+s1);
Console.WriteLine();
//~ 使用new更改变值类型(firstPoint)和引用类型(otherPoint)
//~ 值类型改变不影响s1，引用类型改变没影响s1
Console.WriteLine("TEST 3:");
s2=s1;
s2.Title="I'm s2";
Console.WriteLine("s1: "+s1);
s2.firstPoint=new Point(-99,-98);
s2.otherPoint=new Point[]{new Point(-1,-1),new Point(-2,-2)};
Console.WriteLine("s2: "+s2);
Console.WriteLine("s1: "+s1);
Console.WriteLine();
//~ otherPoint是个数组，s2=s1后，创建这个数组的副本
//~ s2.otherPoint的改变不再影响s1.otherPoint的改变
Console.WriteLine("TEST 4:");
s2=s1;
s2.otherPoint=s1.otherPoint.ToArray(); //创建一个副本
s2.Title="I'm s2";
Console.WriteLine("s1: "+s1);
s2.firstPoint.x=1;
s2.firstPoint.y=2;
s2.otherPoint[0].x=3;
s2.otherPoint[0].y=4;
s2.otherPoint[1].x=5;
s2.otherPoint[1].y=6;
Console.WriteLine("s2: "+s2);
Console.WriteLine("s1: "+s1);
//~ 结论：结构体对象中的引用类型，在结构体所在的栈中只保存了引用对象的引用(指针)，
//~ 使用简单赋值操作(s2=s1)，不会在托管堆中创建引用对象的副本，它们将共同使用同一
//~ 引用对象。即，结构体的简单赋值操作(s2=s1)是对栈中结构体数据进行浅复制。
//~ 注：字符串对象System.String为特别的引用类型，具有值类型行为，因此，结论中的
//~ 引用对象不包含字符串类型对象。
}
}
//具有引用类型的结构体
struct S1
{
public string Title; //字符串具体值类型行为
public Point firstPoint; //结体体是值类型
public Point[] otherPoint; //数组是引用类型
public override string ToString()
{
string otherPointStr=string.Empty;
if(otherPoint!=null)
{
foreach(var item in otherPoint)
{
otherPointStr+=item;
}
}
return string.Format("{0} {1}-{2}",Title,firstPoint,otherPointStr);
}
}
//最简单的结构体
struct Point
{
public int x;
public int y;
public Point(int x,int y)
{
this.x=x;
this.y=y;
}
public override string ToString()
{
return string.Format("({0},{1})",x,y);
}
}
1 >test
2 TEST 1:
3 s1: I'm s1 (0,0)-(1,1)(2,2)
4 s2: I'm s1 (0,0)-(1,1)(2,2)
5 TEST 2:
6 s1: I'm s1 (0,0)-(1,1)(2,2)
7 s2: I'm s2 (50,50)-(150,150)(250,250)
8 s1: I'm s1 (0,0)-(150,150)(250,250)
9 TEST 3:
10 s1: I'm s1 (0,0)-(150,150)(250,250)
11 s2: I'm s2 (-99,-98)-(-1,-1)(-2,-2)
12 s1: I'm s1 (0,0)-(150,150)(250,250)
13 TEST 4:
14 s1: I'm s1 (0,0)-(150,150)(250,250)
15 s2: I'm s2 (1,2)-(3,4)(5,6)
16 s1: I'm s1 (0,0)-(150,150)(250,250)
17 >Exit code: 0 Time: 0.225
引用地址：http://blog.csdn.net/oyi319/article/details/6320091
