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Asked: 2026-05-23T12:22:35+00:00

I have a C# namespace defined as A.B.C which I tried using in a

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I have a C# namespace defined as A.B.C which I tried using in a C++ header with

using namespace A::B::C;

and I get error C2653: A is not a class or namespace.

The unmanaged project is referencing the managed project with this namespace. How do I get around this? TIA.

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1 Answer

  1. Editorial Team

    COM Interop doesn’t let you do that. COM interop lets you retrieve a C++ COM interface pointer to a .NET object, using e.g. CoCreateInstance.

    If you want to refer to the C# namespaces and types directly (not through a COM interface pointer), you want C++/CLI (the /clr option for Visual C++).

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