Can you call a C# DLL from a C DLL?

Question

I've built a DLL in C#. Now I want to use the R Environment to call functions in that DLL. The R environment supports calling unmanaged C/C++ DLL's but not into .NET DLL's. So my question is, can I call functions in a C# DLL from a C/C++ DLL? If so, do you have a link to info about how to do this?

Answer 1

The most straight forward way of doing this is to expose one of the C# classes in your C# DLL as a COM object, and then create an instance of it from your C/C++ DLL. If that isn't an acceptable option, you'd need to create a mixed-mode C++ DLL (which contains both managed and unmanaged code). Your C/C++ DLL can call exported functions in your mixed-mode DLL, which can in turn forward the calls on to your C# class.

Answer 2

This article might help you out:

CLR Hosting APIs (MSDN)

Updated: There's a tool called mergebin that ships with the .NET SQLite wrapper you can use to create a mixed mode native/managed DLL. Grab the source code from:

SQLite for ADO.NET 2.0 (SourceForge)

You'll find the exe in the bin\tools folder.

Kev