How to tell if calling assembly is in DEBUG mode from compiled referenced lib

Question

I have a referenced library, inside there I want to perform a different action if the assembly that references it is in DEBUG/RELEASE mode.

Is it possible to switch on the condition that the calling assembly is in DEBUG/RELEASE mode?

Is there a way to do this without resorting to something like:

bool debug = false;

#if DEBUG
debug = true;
#endif

referencedlib.someclass.debug = debug;

The referencing assembly will always be the starting point of the application (i.e. web application.

Answer 1

The accepted answer is correct. Here's an alternative version that skips the iteration stage and is provided as an extension method:

public static class AssemblyExtensions
{
    public static bool IsDebugBuild(this Assembly assembly)
    {
        if (assembly == null)
        {
            throw new ArgumentNullException(nameof(assembly));
        }

        return assembly.GetCustomAttribute<DebuggableAttribute>()?.IsJITTrackingEnabled ?? false;
    }
}