Mixing C VB In The Same Project

Question

Can you mix vb and c  files in the same project for a class library  Is there some setting that makes it possible   I tried and none of the intellisense works quite right  although the background compiler seems to handle it well enough  aside from the fact that I  then  had 2 classes in the same namespace with the same name and it didn t complain      We re trying to convert from VB to C  but haven t finished converting all the code   I have some new code I need to write  but didn t really want to make a new project just for it

User · Accepted Answer

No  you can t  An assembly project  each project compiles to 1 assembly usually  has to be one language  However  you can use multiple assemblies  and each can be coded in a different language because they are all compiled to CIL  It compiled fine and didn t complain because a VB NET project will only actually compile the  vb files and a C  project will only actually compile the  cs files  It was ignoring the other ones  therefore you did not receive errors  Edit  If you add a  vb file to a C  project  select the file in the Solution Explorer panel and then look at the Properties panel  you ll notice that the Build Action is  Content   not  Compile   It is treated as a simple text file and doesn t even get embedded in the compiled assembly as a binary resource  Edit  With asp net websites you may add c  web user control to vb net website

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For  net 2 0 this works   It DOES compile both in the same project if you create sub directories of in app code with the related language code   As of yet  I am looking for whether this should work in 3 5 or not though

User · Answer

You can not mix vb and c  within the same project - if you notice in visual studio the project files are either  vbproj or  csproj   You can within a solution - have 1 proj in vb and 1 in c    Looks like according to this you can potentially use them both in a web project in the App Code directory   http   pietschsoft com post 2006 03 30 ASPNET-20-Use-VBNET-and-C-within-the-App Code-folder aspx

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I don t see how you can compile a project with the C  compiler  or the VB compiler  and not have it balk at the wrong language for the compiler   Keep your C  code in a separate project from your VB project  You can include these projects into the same solution

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Walkthrough  Using Multiple Programming Languages in a Web Site Project  http   msdn microsoft com en-us library ms366714 aspx       By default  the App Code folder does not allow multiple programming languages  However  in a Web site project you can modify your folder structure and configuration settings to support multiple programming languages such as Visual Basic and C   This allows ASP NET to create multiple assemblies  one for each language  For more information  see Shared Code Folders in ASP NET Web Projects  Developers commonly include multiple programming languages in Web applications to support multiple development teams that operate independently and prefer different programming languages

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In our scenario  its a single VB NET project  Windows Desktop application  in a single solution   However we wanted to take advantage of C  features like signed unsigned integers and XML literals and string features in VB NET   So depending on the features  at runtime we build the code file  compile using respective Rosalyn compiler  VB CS  into DLL and dynamically load into current assembly   Of course we had to work on delinking  unloading  reloading  naming etc of the dynamic DLLs and the memory management were we largely used dynamic GUID for naming to avoid conflict  It works fine where app user may connect to any DB from our desktop app  write SQL query  convert the connection to LINQ connection and write LINQ queries too which all requires dynamic building of source code  compiling into DLL and attaching to current assembly

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It might be possible with some custom MSBuild development  The supplied  targets force the projects to be single language - but there s no runtime or tooling restriction preventing this    Both the VB and CS compilers can output to modules - the CLR s version of  obj files  Using the assembly linker  you could take the modules from the VB and CS code and produce a single assembly   Not that this would be a trival effort  but it probably would work

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Yes its possible adding c  and vb net projects into a single solution   step1  File- Add- Existing Project   Step2  Project- Add reference- dll or exe of project which u added before   step3  In vb net form where u want to use c  forms- import namespace of project

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At the risk of echoing every other answer  no  you cannot mix them in the same project   That aside  if you just finished converting VB to C   why would you write new code in VB

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Right-click the Project  Choose Add Asp Net Folder  Under The Folder  create two folders one named VBCodeFiles and the Other CSCodeFiles In Web Config add a new element under compilation   lt compilation debug  true  targetFramework  4 5 1  gt         lt codeSubDirectories gt           lt add directoryName  VBCodeFiles   gt           lt add directoryName  CSCodeFiles   gt         lt  codeSubDirectories gt   lt  compilation gt    Now  Create an cshtml page  Add a reference to the VBCodeFiles Namespace MyClassName using   using DMH VBCodeFiles Utils RCMHD  model MyClassname   Where MyClassName is an class object found in the namespace above  now write out the object in razor using a cshtml file    lt p gt  Model FirstName lt  p gt    Please note  the directoryName  CSCodeFiles  is redundant if this is a C  Project and the directoryName  VBCodeFiles  is redundant if this is a VB Net project

User · Answer

Although Visual Studio does not support this  you can do some tricks and get MSBuild to compile both  but not from within Visual Studio   SharpDevelop does   You can have both in the same solution  as long as you are running Visual Studio Professional and above   so the easiest solution if you want to keep using Visual Studio is to seperate your VB code into a different project and access it that way

User · Answer

No  not in the same project but you can use them in the same solution  though you need to take care that your code is CLS compliant  That means you must not have  used such functionality feature that is not understand by other language   For example VB does not understand unsigned  ints

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Why don t you just compile your VB code into a library  dll  Reference it later from your code and that s it  Managed dlls contain MSIL to which both c  and vb are compiled

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Well  actually I inherited a project some years ago from a colleague who had decided to mix VB and C  webforms within the same project  That worked but is far from fun to maintain   I decided that new code should be C  classes and to get them to work I had to add a subnode to the compilation part of web config           lt codeSubDirectories gt               lt add directoryName  VB   gt               lt add directoryName  CS   gt           lt  codeSubDirectories gt    The all VB code goes into a subfolder in the App Code called VB and the C  code into the CS subfolder  This will produce two  dll files  It works  but code is compiled in the same order as listed in  codeSubDirectories  and therefore i e Interfaces should be in the VB folder if used in both C  and VB   I have both a reference to a VB and a C  compiler in   lt system codedom gt       lt compilers gt    The project is currently updated to framework 3 5 and it still works  but still no fun to maintain

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Yes  You can add both of the file in web site only If the project is a web application it will not allow different type of file

User · Answer

As others have said  you can t put both in one project   However  if you just have a small piece of C  or VB code that you want to include in a project in the other language  there are automatic conversion tools   They re not perfect  but they do most things pretty well   Also  SharpDevelop has a conversion utility built in

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You need one project per language  I m quite confident I saw a tool that merged assemblies  if you find that tool you should be good to go  If you need to use both languages in the same class  you should be able to write half of it in say VB net and then write the rest in C  by inheriting the VB net class

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