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

You could manually set this symbol using the /define compiler switch. Then you create different build configurations for each desired clr version.