Extending an enum via inheritance

Question

I know this rather goes against the idea of enums, but is it possible to extend enums in C#/Java? I mean \"extend\" in both the sense of adding new values to an enum, but a

Answer 1

Adding enums is a fairly common thing to do if you go back to the source code and edit, any other way (inheritance or reflection, if either is possible) is likely to come back and hit you when you get an upgrade of the library and they have introduced the same enum name or the same enum value - I have seen plenty of lowlevel code where the integer number matches to the binary encoding, where you would run into problems

Ideally code referencing enums should be written as equals only (or switches), and try to be future proof by not expecting the enum set to be const