C # (dotnet): Different for assembly and module

What is the difference between the IL compiled into the module and the assembly

After compiling the same code into different files, the results are as follows by the Decompile to IL

When compiling into netmodule:

manifest file://Metadata version:v4.0.30319. Assemblyexternmscorlib{. PublicKeyToken= (B7 7A 5C About  +  theE0 the)//. Z\v.4 .. ver4:0:0:0}.module Mymodule.netmodule//MVID: {db53ec74-cabd-4430-8651-980a2322ad17}. imagebase0x10000000. File Alignment0x00000200. Stackreserve0x00100000. Subsystem0x0003       //Windows_cui. corflags0x00000001    //ilonly//Image base:0x074b0000metainfo Start: ScopeName:MyModule.netmoduleMVID: {db53ec74-cabd-4430-8651-980A2322AD17}

When compiling into assembly:

manifest file://Metadata version:v4.0.30319. Assemblyexternmscorlib{. PublicKeyToken= (B7 7A 5C About  +  theE0 the)//. Z\v.4 .. ver4:0:0:0}.assembly myassembly{. Custom instancevoid[mscorlib] System.runtime.compilerservices.compilationrelaxationsattribute::.ctor (Int32) = ( on xx  , xx xx xx xx xx). Custom Instancevoid[mscorlib] System.runtime.compilerservices.runtimecompatibilityattribute::.ctor () = ( on xx  on xx  Wu  Geneva  -  $  the  A  -4E 6F 6E $  +   // .... T.. Wrapnonex                                                                                                              the  $  -  About  the6F 6E Wu  the  the6F the  the  on)//ceptionthrows.. hash algorithm0x00008004. Ver0:0:0:0}.module MyAssembly.exe//MVID: {cdb21366-6ac7-4748-b06a-1b05a6391118}. imagebase0x00400000. File Alignment0x00000200. Stackreserve0x00100000. Subsystem0x0003       //Windows_cui. corflags0x00000001    //ilonly//Image base:0x074b0000metainfo Start: ScopeName:MyAssembly.exeMVID: {CDB21366-6ac7-4748-b06a-1b05a6391118}

When you add an existing module to an assembly:

To add a module mymodule.netmodule to a new assembly:

Compile command: Csc/target:library/addmodule:mymodule.netmodule/out:libraryaddedmodule.dll

To view the results after the decompile:

manifest content://Metadata version:v4.0.30319. Assemblyexternmscorlib{. PublicKeyToken= (B7 7A 5C About  +  theE0 the)//. Z\v.4 .. ver4:0:0:0}.assembly libraryaddedmodule{. Custom instancevoid[mscorlib] System.runtime.compilerservices.runtimecompatibilityattribute::.ctor () = ( on xx  on xx  Wu  Geneva  -  $  the  A  -4E 6F 6E $  +   // .... T.. Wrapnonex                                                                                                              the  $  -  About  the6F 6E Wu  the  the6F the  the  on)//ceptionthrows.. Custom instancevoid[mscorlib] System.runtime.compilerservices.compilationrelaxationsattribute::.ctor (Int32) = ( on xx  , xx xx xx xx xx). hash algorithm0x00008004. Ver0:0:0:0}.file mymodule.netmodule. Hash= (6E B4 3E -6D +3 A A  the  About  -  +1 b EB theD4//n.>.m!: "Vv....f.E6 5B B9 E8)// . [...class extern  Publicprocessdomain.demo{. File mymodule.netmodule.class 0x02000003}.class extern  Publicprocessdomain.class1{. File mymodule.netmodule.class 0x02000004}.class extern  Publicprocessdomain.classstatic{. File mymodule.netmodule.class 0x02000005}.module LibraryAddedModule.dll//MVID: {FCAFC9D8-E015-472C-AEAA-E6446901A0F7}. imagebase0x10000000. File Alignment0x00000200. Stackreserve0x00100000. Subsystem0x0003       //Windows_cui. corflags0x00000001    //ilonly//Image base:0x087f0000metainfo Start: ScopeName:LibraryAddedModule.dllMVID: {fcafc9d8-E015-472C-AEAA-E6446901A0F7}

As for the difference:

The assembly is more than the module. Assembly section, if the assembly includes a compiled module, there will be a description section of the Reference module. File and. class extern public

An assembly can consist of multiple modules, the role of the module:

The 1 module can start the assembly faster because not all types are in one file and the module is loaded only when needed.

2 When you need multiple languages to create an assembly, one module can be written in VB, another module is written in C #, you can include these two modules in an assembly

C # (dotnet): Different for assembly and module