Running framework 4.8 and net 6.0 add-ins together?

[Philippe Raemy]

I've got several Excel-DNA based add-ins developped in my company since ~10 years. Of course the oldest ones are based on older dot net frameworks (4.*) and I'm tgrying to bring in a new one using net6.0.
I'm struggling to make them run side-by-side in excel, and the older versions seem to have trouble accessing the excel com layer.
I cannot possibly update all old add-ins to using.
I don't want to give up on the benefits of net6.0 and C# 10.

Has anyone tried trhe smae and faced issues?
If yes, what kind of advice can you give me?

[Govert van Drimmelen]

Hi Philippe,

I'm very interested to understand what problems you have in this configuration.

I expect it to work fine, and have not seen problems in the (rather limited) tests I've done. I know that Microsoft does not officially support running .Net Framework and .Net Core side-by-side, the only issues known to me relate to debugging and sharing types between runtimes. These are expected and should not impact using add-ins like this.

Could you say a bit more about the problems you see?

Can we work towards some small sample add-ins that test your scenario?

-Govert

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