I want to set a rule in .editorconfig so that all C# files where namespace is not explicitly set should render an error.

I've added these:

• dotnet_diagnostic.IDE0130.severity = error # Namespace does not match folder structure
• dotnet_diagnostic.IDE0161.severity = error # Namespace declaration preferences (prefer file-scoped)
• csharp_style_namespace_declarations = file_scoped:error

Namespace is validated to follow file structure.

And to be file scoped

But if I remove the namespace altogether, I get no validation error.