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Asked: 2026-05-11T12:07:01+00:00

I have a C# class library that contains methods that need to be used

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I have a C# class library that contains methods that need to be used with an external application. Unfortunately this external application only supports external APIs in C/C++.

Suppose I have a takeIntReturnDoubleArray method in this C# library that takes an integer and returns an array of doubles. All I need to do is have a C++ method that takes an integer, calls the C# library and returns an array of doubles to the calling application.

So in essence the C++ library is just acting as an intermediary between the C# wrapper and the external application.

Is there an easy way to do this? Do I have to do anything special on the C# side to allow it to be imported into C++ easily? I have seen some talk of using the #import statement but I really have no idea what I am doing when it comes to C++.

What is the approach I should be taking here?

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1 Answer

  1. You have two main options here:

    1. C++\CLI – this allows you to have both managed and unmanaged code in the same source file. The managed portion can then call the C# code.
    2. COM Interop – expose your .NET type as a COM interface and matching coclass which you can easily use from unmanaged C++.
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