How Can I Invoke Arbitrary C# Functions from C ?

Invoking Arbitrary C# Functions from C

While ICLRRuntimeHost::ExecuteInDefaultAppDomain() offers a limited approach to calling C# functions from C , it is not the sole solution. Here are various methods to achieve this goal:

1. C /CLI as an Intermediate DLL:

This involves creating a C /CLI DLL that acts as a bridge between C and C#. The C /CLI DLL exports C functions that invoke C# methods.

2. Reverse P/Invoke:

In this approach, C# code calls exported C functions, allowing C code to access C# functionality.

3. Using COM (Component Object Model):

COM provides a standardized interface for communication between different programming languages. C# assemblies can be exposed as COM objects to be invoked from C code.

4. Using CLR Hosting (ICLRRuntimeHost::ExecuteInDefaultAppDomain()):

While limited to specific function formats, this method allows C code to invoke C# methods within the same process.

5. Interprocess Communication (IPC):

IPC can be used to transmit function calls between C and C# processes, enabling remote invocation.

6. HTTP Server Hosting:

C# functions can be hosted on an HTTP server, and C code can remotely invoke them using HTTP verbs.

7. Manual CLR Hosting:

This advanced technique provides greater flexibility and control over C# function invocation from C by directly loading and executing the C# assembly in-memory.

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