I mention postsharp in my other reply, but I don’t see it as a compelling substitute - because it’s not a native feature of the language or framework, but also because its compile-time byte-code rewriting nature makes it hard to work with and debug. It fills a niche for sure, but I’d rather it be filled natively by the language itself.

Source generators might help with this.

Unfortunately the original doc introducing the feature makes an explicit point to say that the feature does not enable AOP.

First question in the FAQ section:

https://devblogs.microsoft.com/dotnet/introducing-c-source-g...

That’s a shame.