Hello AG,
As for the mixed language problem you mentioned, it is actually due to the
natural limitation of .net framework's assembly referencing. In .net
framework, when you have two assemblies(suppose they're A and B), then
there are only two possible referencing topology. They are:
A reference B(B is referenced by A)
or
B reference A(A is referenced by B)
Two assembly can not reference each other at the same time(cross reference
is not allowed).
For your scenario, you use mixed languages to create custom class in
ASP.NET 2.0's App_code folder(by separate them into own sub directories),
though ASP.NET 2.0 support this pattern, it will actually compile those
classes(of different programming languges and in different sub folders)
into separate assemblies. As the same as above, only one assembly can
reference the other one. Here your CS classes(in cs_subdir) will be
compiled into a dynamic assembly(suppose is named dynamic_cs.dll), your VB
classes will be compiled into another assembly(named dynamic_vb.dll), so
the only supported referecing cases are:
dynamic_vb.dll reference dynamic_cs.dll(VB classes can use CS classes)
dynamic_cs.dll reference dynamic_vb.dll(CS classes can use VB classes)
I haven't got any more detailed info about how the runtime will compile the
sub directories(under App_Code), and make the reference relation ship, but
only one of the above condtions will be allowed.
Also, based on my understanding, the "App_Code" directory help to provide a
"dynamic class library" functionarlity, so each class in App_Code should be
treated as a class library, we should not rely on they can see the
other(unless they are of the same language and can be compiled into the
same assembly). The ASP.NET 2.0 application will always ensure all the page
and usercontrol can correctly reference those classes in App_Code folder.
If you do need to have full control over the reference relationship, I
would suggest you consider move some of the classes into a class library
project so that they can be precompiled into an assembly and be referenced
by the ASP.NET project. How do you think?
Hope this helps some.
Sincerely,
Steven Cheng
Microsoft MSDN Online Support Lead
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