Using C# library in an F# project?

Question

I'm fresh to F#, but I really want to learn it. I know Python, I know C#. As a matter of fact, I've got a C# library that I've made myself; it's an wrapper for the Rdio API (I've named it RdioSharp) that I can successfully bring into another C# project and call it, use it, get data... it works.

I want to get started toying around with this C# library in an F# project, but it's not working right. Here's a brief snipped of what the C# code looks like.

namespace RdioSharp {
    public class RdioManager {
        public RdioManager() { }
    }
}

I've added the reference to the DLL in my FSharpTest project, I've pulled up a .fsx file, and I've tried the following, each line below (again, keep in mind, I really have no idea what I'm doing).

open RdioSharp
open RdioSharp.dll
#r "RdioSharp.dll"
#r "C:\Path\To\Library\RdioSharp.dll"

I can't figure this one out. I know how to use system F# libraries, but how do I reference a C# library in F#? Is it possible? Is this enough information to go on?

I've seen this and this (which gets even closer to my problem) but those folks all know more about F# than I do, and they're way ahead of my problem.

In the interactive window, when punching in #r "RdioSharp.dll";; , I get this lovely error.

error FS0084: Assembly reference 'RdioSharp.dll' was not found or is invalid

Answer 1

The following code works if F# environment can find the location of Rdiosharp.dll . Usually not! So it does not work and tells you that "error FS0084: Assembly reference 'RdioSharp.dll' was not found or is invalid".

#r "RdioSharp.dll"

You can provide the exact path of this dll as in:

#r @"c:\temp\RdioSharp.dll"

or you can add its folder into search-path:

#I @"c:\temp"