Does C# have a not Conditional (!Conditional, NotConditional, Conditional(!)) attribute?
Conditional
!Conditional
NotConditional
Conditional(!)
i know C#
Nope.
Instead, you can write
#if !ShowDebugString [Conditional("FALSE")] #endif
Note that unlike [Conditional], this will be determined by the presence of the symbol in your assembly, not in your caller's assembly.
[Conditional]