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Option Result library for c#
(programming.dev)
A collection of tools for dealing with nulls, failures and the generic type issues that arise in this domain.
https://github.com/Andy3432344/SafeResults
I'm the author, let me know what you think!
*Edit: updated to show GitHub link, sorry!
You can't disagree with the fact that Nullable works a lot like an Option. Returning an error is not idiomatic C# code (which would be to throw an exception usually) but if you wanted that, you'd use a Result<T, TError> type or similar.