asp net qr code generator free Using the Assembly Linker in VS .NET

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Using the Assembly Linker
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Instead of using the C# compiler, you might want to create assemblies by using the Assembly Linker utility, AL .exe . The Assembly Linker is useful if you want to create an assembly consisting of modules built from different compilers (if your compiler doesn t support the equivalent of C# s /addmodule switch) or perhaps if you just don t know your assembly packaging requirements at build time . You can also use AL .exe to build resource-only assemblies, called satellite assemblies, which are typically used for localization purposes . I ll talk about satellite assemblies later in the chapter . The AL .exe utility can produce an EXE or a DLL PE file that contains only a manifest describing the types in other modules . To understand how AL .exe works, let s change the way the JeffTypes .dll assembly is built:
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csc /t:module RUT.cs csc /t:module FUT.cs al /out:JeffTypes.dll /t:library FUT.netmodule RUT.netmodule
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Figure 2-3 shows the files that result from executing these statements .
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2 RUT.netmodule
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Building, Packaging, Deploying, and Administering Applications and Types FUT.netmodule IL compiled from FUT.cs Metadata Types, methods, and so on defined by FUT.cs Types, methods, and so on referenced by FUT.cs
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IL compiled from RUT.cs Metadata Types, methods, and so on defined by RUT.cs Types, methods, and so on referenced by RUT.cs
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JeffTypes.dll (no IL) Metadata (No definition or reference tables) Manifest Assembly files (self, RUT.netmodule, and FUT.netmodule) Public assembly types (RUT.netmodule and FUT.netmodule)
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FIguRE 2-3 A multifile assembly consisting of three managed modules, one with a manifest
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In this example, two separate modules, RUT .netmodule and FUT .netmodule, are created . Neither module is an assembly because they don t contain manifest metadata tables . Then a third file is produced: JeffTypes .dll, which is a small DLL PE file (because of the /t[arget]:library switch) that contains no IL code but has manifest metadata tables indicating that RUT .netmodule and FUT .netmodule are part of the assembly . The resulting assembly consists of three files: JeffTypes .dll, RUT .netmodule, and FUT .netmodule . The Assembly Linker has no way to combine multiple files into a single file . The AL .exe utility can also produce CUI and GUI PE files by using the /t[arget]:exe or /t[arget]:winexe command-line switches . But this is very unusual since it would mean that you d have an EXE PE file with just enough IL code in it to call a method in another module . You can specify which method in a module should be used as an entry point by adding the /main command-line switch when invoking AL .exe . The following is an example of how to call the Assembly Linker, AL .exe, by using the /main command-line switch:
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csc /t:module /r:JeffTypes.dll Program.cs al /out:Program.exe /t:exe /main:Program.Main Program.netmodule
Part I CLR Basics
Here the first line builds the Program .cs file into a Program .netmodule file . The second line produces a small Program .exe PE file that contains the manifest metadata tables . In addition, there is a small global function named __EntryPoint that is emitted by AL .exe because of the /main:Program.Main command-line switch . This function, __EntryPoint, contains the following IL code:
.method privatescope static void __EntryPoint$PST06000001() cil managed { .entrypoint // Code size 8 (0x8) .maxstack 8 IL_0000: tail. IL_0002: call void [.module 'Program.netmodule']Program::Main() IL_0007: ret } // end of method 'Global Functions'::__EntryPoint
As you can see, this code simply calls the Main method contained in the Program type defined in the Program .netmodule file . The /main switch in AL .exe isn t that useful because it s unlikely that you d ever create an assembly for an application that didn t have its entry point in the PE file that contains the manifest metadata tables . I mention the switch here only to make you aware of its existence . With the code that accompanies this book, I have created a Ch02-3-BuildMultiFileLibrary .bat file that encapsulates all the steps required to build a multifile assembly . The Ch02-4-AppUsingMultiFileLibrary project in Visual Studio invokes this batch file as a prebuild command-line step . You can examine this project to see how to integrate building and referencing a multifile assembly from within Visual Studio .
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