C++/CLI CS0246: The type or namespace name 'Wrapper' could not be found

Question

I am encountering an issue that seems identical to this one.

I have a VS 2008 solution that includes, among other things: (names changed for simplicity)

DLL A: A native C++, business logic DLL
DLL B: A C++/CLI wrapper for DLL A with a namespace of "Wrapper"
EXE: A C# WinForms GUI EXE project that (references DLL B)

When I build the EXE, VS gives me an error:

error CS0246: The type or namespace name 'Wrapper' could not be found (are you missing a using directive or an assembly reference?)

However:

There are no other errors or warnings reported
All references in the EXE project seem to resolve properly
DLL A and DLL B both build without errors or warnings
DLL A includes both .h header and .cpp files (that simply include the .h header)
I can traverse the 'Wrapper' namespace in the object browser without issues

The first linked question mentions something about a "duplicate definition of a compiler symbol", but I'm not sure what to look for in that sense.

Any ideas for what to try?

Did you add a reference to the DLL B project from the EXE project? (You said all references resolve, but you didn't enumerate 'all'.) — David Yaw, Mar 14 '13 at 17:15

score 0 · Accepted Answer · answered Mar 14 '13 at 17:23

I think I figured this out.

Some more background: before building, the entire solution is created using CMake. I use CMake to make some edits to the csproj file for the EXE to point it to the correct references, including DLL B.

Whenever I run CMake, the statically defined GUID for DLL B in the ProjectReference node of the csproj file gets out of sync with the newly generated GUID for the vcproj that outputs DLL B. This GUID mismatch causes DLL B not to be referenced at build time, even though it shows up in the list of references and there are no related warnings or errors.

The way I discovered this was by looking at the build output. In the call to csc.exe, there was no '/reference' entry for DLL B.

Now I need to find a way to keep these GUIDs in sync!

@Kohnaz So how did you keep these GUID's in sync. Can you post the updated answer ? — Versatile, Jun 02 '17 at 13:25
@Versatile Luckily I somewhat documented this in a related question (https://stackoverflow.com/a/15432733/931528), because my memory is quite hazy on this. There may well be better supported options nowadays with CMake + .NET. — Kohanz, Jun 02 '17 at 15:55

C++/CLI CS0246: The type or namespace name 'Wrapper' could not be found

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