CLR在加载程序集的时候会查看程序集清单,程序集清单包含哪些内容呢?可执行文件和程序集有什么区别/
程序集清单
□ 查看程序集清单
→清空F盘as文件夹中的所有内容
→创建MainClass.cs文件
→把MainClass.cs编译成程序集
→反编译MyDll.dll,在1.txt文件中呈现
monospace; width: 100%; margin: 0em; background-color: #f0f0f0">ildasm /out:1.txt MyDll.dll
1.txt
// Metadata version: v4.0.30319
.assembly extern mscorlib
{.publickeytoken = (B7 7A 5C 56 19 34 E0 89 ) // .z\V.4..
.ver 4:0:0:0}.assembly MyDll{.custom instance void [mscorlib]System.Runtime.CompilerServices.CompilationRelaxationsAttribute::.ctor(int32) = ( 01 00 08 00 00 00 00 00 ).custom instance void [mscorlib]System.Runtime.CompilerServices.RuntimeCompatibilityAttribute::.ctor() = ( 01 00 01 00 54 02 16 57 72 61 70 4E 6F 6E 45 78 // ....T..WrapNonEx63 65 70 74 69 6F 6E 54 68 72 6F 77 73 01 ) // ceptionThrows.
.hash algorithm 0x00008004.ver 0:0:0:0}.module MyDll.dll// MVID: {7BE59AA1-0AE6-426E-B77D-5B85AB4B163F}
.imagebase 0x10000000.file alignment 0x00000200.stackreserve 0x00100000.subsystem 0x0003 // WINDOWS_CUI.corflags 0x00000001 // ILONLY
// Image base: 0x00A00000
// *********** 反汇编完成 ***********************
// 警告: 创建了 Win32 资源文件 1.res
○ .assembly extern mscorlib,不管MainClass.cs中有没有代码,一定会引用mscorlib程序集
○ .assembly MyDll语句块中的内容就是程序集清单,manifest
○ .hash algorithm 0x00008004和.ver 0:0:0:0是程序集清单中2个重要的方面
□ 查看module清单
→把MainClass.cs编译成module
csc /t:module /out:MyModule.netmodule MainClass.cs
→反编译MyModule,在2.txt文件中打开
ildasm /out:2.txt MyModule.netmodule
→打开2.txt文件
2.txt
// Metadata version: v4.0.30319
.assembly extern mscorlib
{.publickeytoken = (B7 7A 5C 56 19 34 E0 89 ) // .z\V.4..
.ver 4:0:0:0}.module MyModule.netmodule// MVID: {17B1ABDD-85D4-42F8-AF6D-07B860FCADEC}
.imagebase 0x10000000.file alignment 0x00000200.stackreserve 0x00100000.subsystem 0x0003 // WINDOWS_CUI
.corflags 0x00000001 // ILONLY
// Image base: 0x00260000
.custom ([mscorlib]System.Runtime.CompilerServices.AssemblyAttributesGoHere) instance void [mscorlib]System.Runtime.CompilerServices.RuntimeCompatibilityAttribute::.ctor() = ( 01 00 01 00 54 02 16 57 72 61 70 4E 6F 6E 45 78 // ....T..WrapNonEx63 65 70 74 69 6F 6E 54 68 72 6F 77 73 01 ) // ceptionThrows.
// *********** 反汇编完成 ***********************
○ 以上只有mscorlib这个程序集的清单。
DLL和EXE的区别
→删除F盘as文件夹中除了MainClass.cs之外的所有文件
→用记事本打开MainClass.cs文件,修改如下,保存
using System;
class MainClass
{static void Main(){Console.WriteLine("Hello World");
}}
→编译MainClass.cs,生成MainClass.exe文件
csc MainClass.cs
MainClass.exe
csc /t:library MainClass.cs
ildasm /out:1.txt MainClass.exe
1.txt
// Metadata version: v4.0.30319
.assembly extern mscorlib
{.publickeytoken = (B7 7A 5C 56 19 34 E0 89 ) // .z\V.4..
.ver 4:0:0:0}.assembly MainClass{.custom instance void [mscorlib]System.Runtime.CompilerServices.CompilationRelaxationsAttribute::.ctor(int32) = ( 01 00 08 00 00 00 00 00 ).custom instance void [mscorlib]System.Runtime.CompilerServices.RuntimeCompatibilityAttribute::.ctor() = ( 01 00 01 00 54 02 16 57 72 61 70 4E 6F 6E 45 78 // ....T..WrapNonEx63 65 70 74 69 6F 6E 54 68 72 6F 77 73 01 ) // ceptionThrows.
.hash algorithm 0x00008004.ver 0:0:0:0}.module MainClass.exe// MVID: {1FD51DE8-5CD3-4408-AAB2-630AA5482E23}
.imagebase 0x00400000.file alignment 0x00000200.stackreserve 0x00100000.subsystem 0x0003 // WINDOWS_CUI
.corflags 0x00000001 // ILONLY
// Image base: 0x003B0000
// =============== CLASS MEMBERS DECLARATION ===================
.class private auto ansi beforefieldinit MainClassextends [mscorlib]System.Object{.method private hidebysig static void Main() cil managed{.entrypoint// 代码大小 13 (0xd)
.maxstack 8IL_0000: nopIL_0001: ldstr "Hello World"
IL_0006: call void [mscorlib]System.Console::WriteLine(string)IL_000b: nopIL_000c: ret} // end of method MainClass::Main
.method public hidebysig specialname rtspecialname
instance void .ctor() cil managed
{// 代码大小 7 (0x7)
.maxstack 8IL_0000: ldarg.0IL_0001: call instance void [mscorlib]System.Object::.ctor()
IL_0006: ret} // end of method MainClass::.ctor
} // end of class MainClass
// =============================================================
// *********** 反汇编完成 ***********************
// 警告: 创建了 Win32 资源文件 1.res
ildasm /out:2.txt MainClass.dll
2.txt
// Metadata version: v4.0.30319
.assembly extern mscorlib
{.publickeytoken = (B7 7A 5C 56 19 34 E0 89 ) // .z\V.4..
.ver 4:0:0:0}.assembly MainClass{.custom instance void [mscorlib]System.Runtime.CompilerServices.CompilationRelaxationsAttribute::.ctor(int32) = ( 01 00 08 00 00 00 00 00 ).custom instance void [mscorlib]System.Runtime.CompilerServices.RuntimeCompatibilityAttribute::.ctor() = ( 01 00 01 00 54 02 16 57 72 61 70 4E 6F 6E 45 78 // ....T..WrapNonEx63 65 70 74 69 6F 6E 54 68 72 6F 77 73 01 ) // ceptionThrows.
.hash algorithm 0x00008004.ver 0:0:0:0}.module MainClass.dll// MVID: {765C3610-5865-4A53-995C-22B24BDCAEDE}
.imagebase 0x10000000.file alignment 0x00000200.stackreserve 0x00100000.subsystem 0x0003 // WINDOWS_CUI
.corflags 0x00000001 // ILONLY
// Image base: 0x00370000
// =============== CLASS MEMBERS DECLARATION ===================
.class private auto ansi beforefieldinit MainClassextends [mscorlib]System.Object{.method private hidebysig static void Main() cil managed{// 代码大小 13 (0xd)
.maxstack 8IL_0000: nopIL_0001: ldstr "Hello World"
IL_0006: call void [mscorlib]System.Console::WriteLine(string)IL_000b: nopIL_000c: ret} // end of method MainClass::Main
.method public hidebysig specialname rtspecialname
instance void .ctor() cil managed
{// 代码大小 7 (0x7)
.maxstack 8IL_0000: ldarg.0IL_0001: call instance void [mscorlib]System.Object::.ctor()
IL_0006: ret} // end of method MainClass::.ctor
} // end of class MainClass
// =============================================================
// *********** 反汇编完成 ***********************
// 警告: 创建了 Win32 资源文件 2.res
MainClass.exe和MainClass.dll在IL上的不同体现在:
○ EXE有程序的入口店.entrypoint,而DLL没有
○ EXE的modlue名称为MainClass.exe,DLL的module名称为MainClass.dll
“C#程序集系列”包括:
参考资料:
http://www.computersciencevideos.org/ created by Jamie King