A "very internal" scope

[TonyValenti]

Is there a way to make an internal class not visible to an [InternalsVisibleTo] assembly and only ever accessible to the current assembly?

[DavidArno]

Don't use [InternalsVisibleTo]? Aside from that, no there isn't. You either expose all internals, or none.

[CyrusNajmabadi]

Yes. Use can analyzer to block it.

[teo-tsirpanis]

There is the compilercontrolled visibility, but only for members, not types.

[KarolKalbarczyk]

Is this something available in C#? Or only IL?

[teo-tsirpanis]

Only IL.