Does .net calling COM which in turn calls other .net COM object works when using SxS and manifest fi

Posted by Alex Shnayder on Stack Overflow See other posts from Stack Overflow or by Alex Shnayder
Published on 2010-04-07T11:11:31Z Indexed on 2010/04/07 11:13 UTC
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I have a .net application calling to a COM component (C++) which in turn calls to another COM object implemented in .NET.

This application is using Windows SxS capabilities and does not register any of it's COM components. Not the one written in C++, and not the one written in .net.

This first call to the C++ COM component works fine. But when the C++ COM component calls to the .net one, it fails with class not registered.

I have tried creating a small C++ app with a manifest file which calls the .net component and it works. It seems that when the flow is .net -> COM NATIVE -> .NET COM. Then SxS breaks and does not work.

When looking at Fusion Logs (assembly loading logs) I see that no one is even attempting to resolve the .NET COM assembly.

Is this SxS scenario even supposed to work (I think it does supposed to work)? If yes, then what can I be doing wrong ?

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