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Functions and macros created in an Excel-DNA add-in can be called directly from Excel VBA by using Application.Run(...). However, .NET also supports creating rich object models that are exported as COM libraries, which can be Tools->Referenced in VBA. Excel-DNA has some advanced support to host COM-exported objects from Excel-DNA add-ins, giving some advantages over the regular .NET "Register for COM interop" hosting approach:

  • COM objects that are created via the Excel-DNA COM server support will be active in the same AppDomain as the rest of the add-in, allowing direct shared access to static variables, internal caches etc.

  • COM registration for classes hosted by Excel-DNA does not require administrative access (even when registered via RegSvr32.exe).

  • Everything needed for the COM server can be packed in a single-file .xll add-in, including the type library used for IntelliSense support in VBA.

Mikael Katajamäki has written some detailed tutorial posts on his Excel in Finance blog that explore this Excel-DNA feature, with detailed explanation, step-by-step instructions, screen shots and further links. See:

Note that these techniques would work equally well with code written in VB.NET, allowing you to port VB/VBA libraries to VB.NET with Excel-DNA and then use these from VBA.

Thank you Mikael for the great write-up!