How do I expose a .netstandard2.0 library with COM for use in VB6?

Question

I have a dotnet core library, a framework 4.7.2 library and a vb6 application.

I want to write a common library for them all to access and so choose .netstandard2.0<

Answer 1

A reminder to myself

• Use a demo UI to access the original DLL to confirm the call works. ( if you can't get it to work skip to making the App.Config for the unit test project using BindingRedirectGenerator )

• Add a unit test in the com visible project to confirm the call works.

• Copy all the dlls created by both projects to the release folder

For each com visible dll run as Administrator

c:\windows\microsoft.net\framework\v4.0.30319\regasm /verbose /codebase /tlb:MyLibrary.tlb c:\myproject\releasedlls\MyLibrary.dll

• Install BindingRedirectGenerator to c:\brg say

• At the command prompt change directory to c:\brg

    BindingRedirectGenerator c:\myproject\releasedlls App.config
  

• Rename App.config to MyVB6Project.exe.config and copy it to the same folder as MyVB6Project.exe

Remember to set up the files for the vb6.exe folder if you want to run it in the vb6 ide

Put the whole process in a script for future use ( I used a .bat)

Keep an eye on what nuget has put in app.config

Pay attention to the yellow warnings at build time!