Changing Conditional Compilation in project reference in Visual Studio

Question

I have a class library A that is used in other projects in my solution like B and C.

Class library A behaves differently based on the presence of a pre-processor directive, for example :

#if some_directive
      // some code
#else
      // some other code
#end

How can I use class library A in project B with enabled some_directive but use in project C with disabled some_directive?

Answer 1

You can do something like this using the ConditionalAttribute

This is how Debug.WriteLine() is present or non-present depending on presence of the "DEBUG" symbol.

You will be able to define your own name for the conditional symbol that you use to control the presence or absence of the code.

You can then put that symbol into the list in the "Conditional compilation symbols" settings on the project properties "Build" tab for the project where you want the code.

This doesn't allow you to have the "some other code" part unfortunately, and also it only applies to entire methods.