How do I set a system-wide _ifdef?

[Xarzu Thompson]

This is using Microsoft Visual Stuedio version 2019 with C#.

If I want to add specialized code to a project shared by multiple software developers that is designed for my selfish tests and evaluation, how do I manage a # definition inside the C# code?

I imagine some soft of solution varable that is deined in either the project file or the solution file that I do not merge with the master branch of the code in the version contorl system.  And then this "# define" is somehow blocked out in the source file.

Has anyone experienced or used such a thing?

[Stephan van Hulst]

The point of C# is that it's more portable than the languages that came before it. Honestly, I was a bit surprised and disappointed when I found out they added preprocessor directives at all.

Can you explain a bit more what you're trying to do? It appears to me as if you just want to modify the code without it affecting the main branch. Why do you need preprocessor directives for that? Just make a separate branch and merge the main branch into it whenever the main branch gets updated.