Conditional compilation depending on the framework version in C#

Question

Are there any preprocessor symbols which allow something like

#if CLR_AT_LEAST_3.5
// use ReaderWriterLockSlim
#else
// use ReaderWriterLock
#endif
         


        

Answer 1

If that's all you needed to do, I suppose you could use Environment.Version, but like divo's solution, it does seem to leave a lot of unneccessary code there.