How do projects written in multiple languages ​​work?

Question

C++ / C#

You need to add C++ code to the C# project. How can I do that?
And yes, it's interesting how it all works.

Answer 1

The assembler is the same so far, the DLL API too. It all works through them. You wrap your code in a DLL, expose an interface from it, and work like with any other plug-in library.

Answer 2

A separate application within the system, for example. And communicate via sockets, bus, SOAP, REST, queues, etc.

Answer 3

Option 1: P/Invoke .
Option 2: C++/CLI .
Option 3: A standalone C++ service that exposes the API via HTTP/Protobuf/whatever.