You should probably read the stuff in that other question more clearly, because it does actually give links to relevant stuff. But here's a bullet-point version anyway:

• You can call unmanaged native code from .NET using P/Invoke. See the end of the Wikipedia article for tutorials and documentation on this part.

• You can export Haskell functions through Haskell's FFI. Make sure you export the functions with the correct calling convention (stdcall, not ccall). See also GHC's FFI documentation.

So basically what you want to do is export your Haskell functions as if you were going to use them from C, build a DLL with the functions you want, then use P/Invoke to call the Haskell functions. And definitely re-read the accepted answer to the other question, it mentions several pitfalls you'll need to avoid.

You should probably read the stuff in that other question more clearly, because it does actually give links to relevant stuff. But here's a bullet-point version anyway:

• You can call unmanaged native code from .NET using P/Invoke. See the end of the Wikipedia article for tutorials and documentation on this part.

• You can export Haskell functions through Haskell's FFI. Make sure you export the functions with the correct calling convention (stdcall, not ccall). See also GHC's FFI documentation.

So basically what you want to do is export your Haskell functions as if you were going to use them from C, build a DLL with the functions you want, then use P/Invoke to call the Haskell functions. And definitely re-read the accepted answer to the other question, it mentions several pitfalls you'll need to avoid.