C# Interactive : applying #define'd symbols in following #load'ed files.

[JDiLenarda]

What brings me to make this suggestion is the impossibility to declare a namespace in a c# script, which forbid to load a source code file having one (see dotnet/roslyn/#4478).

Whatever, I was hoping that using preprocessor directives could help :

/* SomeClass.cs */
#if !INTERACTIVE
namespace SomeNameSpace
{
#endif
    public class SomeClass
    {
        public static void Test() => Console.WriteLine("Tested");
    }
#if !INTERACTIVE
}
#endif

Then execute this as a script or in the REPL :

#define INTERACTIVE
#load "./SomeClass.cs"
SomeClass.Test()

Unfortunately, it results as error CS7021: You cannot declare namespace in script code.

For contrast, F# doesn't have #define directive, but F# Interactive embeds an INTERACTIVE symbol that can be use in compilable files through conditional precompiler directives.

If there is way to work this, please consider this suggestion as a question.