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Editorial Team
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Asked: 2026-05-16T05:06:43+00:00

Even with F# installed, Visual Studio 2008 (and probably 2010) only provides Add-In project

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Even with F# installed, Visual Studio 2008 (and probably 2010) only provides Add-In project templates for C#, VB.NET and C++.

So, how to create a F# based Add-In?

I have tried to create a F# class library project with a new class implementing IDTExtensibility2, setting the correct references (EnvDTE, Extensibility, …), copying a few project attributes from the C# Add-In (mainly the command line for debugging), and creating the .AddIn manifest file by hand, but no success. When VS is launched, my Add-In is not listed in the available ones.

What are the missing steps? Some kind of COM registration somewhere?

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1 Answer

  1. Editorial Team

    I finally found what went wrong: I simply forgot to put the .AddIn file in the AddIn directory (the C# wizard is doing this automatically).

    So, to create a F# based Add-In for Visual Studio:

    • Create a new F# class library project
    • Add a few reference assemblies to the project (mainly EnvDTE, EnvDTE80, EnvDTE90, Extensibility)
    • Create a new class implementing IDTExtensibility2
    • Copy the debugging properties of a C# based Add-In project into your F# project
    • Copy the .AddIn manifest file, and modify it according to your F# project
      *.. and don’t forget to copy that new file in the AddIn directory for the user session
    • enjoy!
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