CefSharp doesn't play well with App Domains, and so doesn't work easily using Excel-DNA, for example. It had been suggested that RedGate.AppHost could be used to deal with the problem, and so this example project was made. It works!
This solution was built using Visual Studio 2019.
Usual procedure to launch an Excel add-in:
Now when you Start the solution it will launch Excel and the add-in.
Thanks to the following:
There is an alternative branch called named-pipe
which doesn't seem to work currently, but may be useful to consider as an alternative to the embedded HTTP server example here.
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