namespace BugQiang.Al {    public class ClassA1 {        public static readonly string STATIC_READONLY_STRING = "STATIC_READONLY_STRING";        public const string CONST_STRING = "CONST_STRING";    }}

using System;using BugQiang.Al;namespace BugQiang.B1 {    public class ClassB1 {        public static void ShowClassA1() {            Console.WriteLine("ClassA1.CONST_STRING = {0}\r\nClassA1.STATIC_READONLY_STRING = {1}",                ClassA1.CONST_STRING,                ClassA1.STATIC_READONLY_STRING);        }    }    class Program {        static void Main() {            ClassB1.ShowClassA1();        }    }}

编译并运行：

C:\Users\de\Desktop\bao>csc /t:library /nologo ClassA1.cs

C:\Users\de\Desktop\bao>csc /r:ClassA1.dll /nologo ClassB1.cs

C:\Users\de\Desktop\bao>ClassB1

ClassA1.CONST_STRING = CONST_STRING

ClassA1.STATIC_READONLY_STRING = STATIC_READONLY_STRING

C:\Users\de\Desktop\bao>

重新编辑ClassA1.cs

namespace BugQiang.Al {    public class ClassA1 {        public static readonly string STATIC_READONLY_STRING = "REBUILD_STATIC_READONLY_STRING";        public const string CONST_STRING = "REBUILD_CONST_STRING";    }}

重新编译ClassA1.cs,并运行ClassB1.exe:

C:\Users\de\Desktop\bao>csc /t:library /nologo ClassA1.cs

C:\Users\de\Desktop\bao>ClassB1

ClassA1.CONST_STRING = CONST_STRING

ClassA1.STATIC_READONLY_STRING = REBUILD_STATIC_READONLY_STRING

C:\Users\de\Desktop\bao>

？？？？

反编译打开ClassB1.exe

C:\Users\de\Desktop\bao>ildasm

C:\Users\de\Desktop\bao>

打开ClassB1.exe后，view/metainfo/show! (Ctrl + M)

在metainfo的最底部有这么一节:

User Strings

-------------------------------------------------------

70000001 : (64) L"ClassA1.CONST_STRING = {0}\r\nClassA1.STATIC_READONLY_STRING = {1}"

70000084 : (12) L"CONST_STRING"

以及ClassB1.ShowClassA1对应的IL代码

.method public hidebysig static void  ShowClassA1() cil managed

{

  // Code size       23 (0x17)

  .maxstack  8

  IL_0000:  nop

  IL_0001:  ldstr      "ClassA1.CONST_STRING = {0}\r\nClassA1.STATIC_READONL"

  + "Y_STRING = {1}"

  IL_0006:  ldstr      "CONST_STRING"

  IL_000b:  ldsfld     string [ClassA1]BugQiang.Al.ClassA1::STATIC_READONLY_STRING

  IL_0010:  call       void [mscorlib]System.Console::WriteLine(string,

                                                                object,

                                                                object)

  IL_0015:  nop

  IL_0016:  ret

} // end of method ClassB1::ShowClassA1

结束语:.NET字符串驻留机制