Solution-wide #define

Question

Is there a way to globally declare a #define?

Like I want to have a file that has for instance,

#define MONO

and I want all source-

Answer 1

I don't think there is a way to create a solution-wide #define. You can create one for each project/assembly, as the other answers have described, but you'll need to do this for each and every project in the solution if you need all source code files to know of that #define.