MFC 프로젝트에서 C# 라이브러리를 사용하는 방법

To use a C# library in an MFC (Microsoft Foundation Class) project, you'll need to create a wrapper around the C# library so that it can be used by the MFC project. This can be done by creating a C++/CLI (Common Language Infrastructure) wrapper.

Here's an overview of the process:

1. Add a new project to your solution that is a C++/CLI Class Library.
2. In the new project, add a reference to the C# library that you want to use.
3. Define an interface in the C++/CLI Class Library that maps to the functionality exposed by the C# library.
4. Implement the interface in the C++/CLI Class Library by calling into the C# library.
5. Build the C++/CLI Class Library to create a DLL.
6. Add the DLL as a reference to your MFC project.
7. In the MFC project, use the functionality exposed by the C++/CLI Class Library.

It's important to note that, this process can be complex and sometimes it can take a good amount of time, to understand and make it work properly. Also, it's a good idea to use the latest C++ standard and Visual Studio to handle the C++/CLI syntax and its complexity.

Keep in mind that, a C# library can be used in a MFC project, but it is not a straightforward process and you need an interop layer in between like the C++/CLI, that will help MFC and C# to communicate.