I am calling ODBC API functions from a C# program.  At first I was specifying
CharSet=CharSet.Unicode because I wanted to assume that the Unicode versions
were available.  However, now I think I need to check whether the ANSI functions
are being called.

In Adam Nathan's book ".NET and COM: The Complete Interoperability Guide", on
page 797, he says (under the section on CharSet.Unicode):

"Unicode...causes the CLR to look for an entry point called FunctionNameW, even
if there is an entry point called FunctionName. (If there is no FunctionNameW
function, FunctionName will be invoked if it exists.)"

My question is, how can I tell at runtime which function (FunctionNameW or
FunctionName) was called?   I need to do this in a platform-independent way
because I am running on Mono also (in fact, that's where I'm seeing the ANSI
functions chosen instead of Unicode).

Thinking about it now, I guess I could do something brute-force and use the
ExactSpelling setting to declare a P/Invoke signature for the W function, and
trap for System.EntryPointNotFoundException, but I was wondering if there was a
smarter way.

Thanks,
Chuck