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stringÊÇÒýÓÃÀàÐÍ£¬Õâ¾ÍÊÇ˵stringÔÚ¶ÑÉϱ£´æÊý¾Ý£¬¶øÔÚÕ»Öд洢µÄÊǶÔÏóµØÖ·£¬ÔÚÀí½âstringÀàÐÍÌØÐÔʱÊ×ÏÈÐèÒª¼ÇסÕâµã¡£Ö»²»¹ýÓëÆäËüһЩÒýÓÃÀàÐÍÏà±È£¬ËüÓÖÓÐһЩ±È½ÏÌØÊâµÄÌØÐÔ£¬±ÈÈçÏÂÃæµÄÕâЩ£º
(2)stringÊDz»¿É±äµÄ(immutable)£º
stringµÄÕâÒ»ÌØÐÔÊÇÖ¸£¬¶ÔÓÚÒÑÓеÄÒ»¸östring¶ÔÏ󣬵±ÄãÐÞ¸ÄËüʱ£¬Êµ¼ÊÊÇÖØÐ´´½¨ÁËÒ»¸ö·ûºÏÄãÒªÇóµÄstring¶ÔÏó¡£ÎÒͨ¹ýÒÔϵÄÀý×Ó½øÐÐÑÝʾ£º
static void Main(string[] args)
{
    string x = "should it matter";
    x = x + " ?"; //breakpoint (1)
}//breakpoint (2)
F5ÔËÐÐÖÁbreakpoint (1)´¦£¬ÔÚ¼´Ê±´°¿ÚÖÐÖ´ÐÐÒÔÏÂsosµ÷ÊÔÃüÁî(¹ØÓÚsosµ÷ÊÔÀ©Õ¹£¬¿ÉÒԲμû¡¶VS 2005ÖÐSosµ÷ÊÔÀ©Õ¹¼ò½é¡·)£º
!load sos.dll
extension C:"WINDOWS"Microsoft.NET"Framework"v2.0.50727"sos.dll loaded
!clrstack -a
PDB symbol for mscorwks.dll not loaded
OS Thread Id: 0x1508 (5384)
ESP       EIP    
0012f440 012f009f ConsoleApplication1.Program.Main(System.String[])
    PARAMETERS:
        args = 0x0137cdc8
    LOCALS:
        <CLR reg> = 0x0137cdd8
0012f69c 79e7c74b [GCFrame: 0012f69c]
ÓÖF5ÔËÐÐÖÁbreakpoint (2)´¦£¬ÖØÐÂÖ´ÐÐclrstackÃüÁ½á¹ûÈçÏ¡£¿ÉÇå³þ¿´µ½¶ÔÏóxÔÚÄÚ´æÖеĵØÖ··¢ÉúÁ˱仯£¬ÓÉÔ­À´µÄ0x0137cdd8±ä³É0x0137ce24¡£
!clrstack -a
OS Thread Id: 0x1508 (5384)
ESP       EIP    
0012f440 012f00b0 ConsoleApplication1.Program.Main(System.String[])
    PARAMETERS:
        args = 0x0137cdc8
    LOCALS:
        <CLR reg> = 0x0137ce24
0012f69c 79e7c74b [GCFrame: 0012f69c]
(3)stringÅеȣº
¶ÔÓÚstringÀàÐÍÀ´Ëµ£¬Æäequals()·½·¨Óë“==”²Ù×÷·ûÆðµ½µÄЧ¹û¶¼ÊÇÒ»ÑùµÄ£¬Õâµã¿ÉÒÔ´Ó“==”²Ù×÷µÄ·´±àÒë´úÂëÖпÉÒÔ¿´³öÀ´£º
public static bool operator ==(string a, string b)
{
    return Equals(a, b);


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C# code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Value_Ref_test1
{
class Program
{
static void Main(string[] args)
{
point a = new point (10,10) ;
point b = a;
......

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