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Are there any preprocessor symbols which allow something like
#if CLR_AT_LEAST_3.5 // use ReaderWriterLockSlim #else // use ReaderWriterLock #endif or some other way to do this?
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The compiler directives that are used for conditional compilation are the DEFINE directive, the EVALUATE directive, and the IF directive.
The preprocessor conditional compilation directive spans several lines: The condition specification line (beginning with #if , #ifdef , or #ifndef ) Lines containing code that the preprocessor passes on to the compiler if the condition evaluates to a nonzero value (optional) The #elif line (optional)
These are for compiler constants, for example: #if DEBUG Debug.WriteLine("This is written in debug mode"); #endif. If the DEBUG constant is defined, that code gets compiled, if it's not then it's stripped out, ignored by the compiler..it's a way to determine what's in a certain build type, and stripped out for another.
I don't think there are any predefined 'preprocessor' symbols. However you can achieve what you want like this:
Create different configurations of your project, one for every version of CLR you want to support.
Choose a symbol like VERSION2, VERSION3 etc. per CLR version.
In every configuration, define the one symbol associated with it and undefine all others.
Use these symbols in conditional compilation blocks.
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