CODEWITHSUNDEEP
c#dllf#
user3685285
user3685285

Reputation: 6586

F# dll in F# script

I have a C# dll that I need to reference in F#. I can do this fine in a .fs file, but I can't seem to get it to work in an F# script (.fsx) It is strange because in my script, I have no problem referencing F# dlls. I thought C# dlls and F# dlls were essentially the same.

EDIT:

I have two dlls (1) csharp.dll and (2) fsharp.dll built with csharp and fsharp respectively. I reference them with:

#r "bin\Debug\csharp.dll"
#r "bin\Debug\fsharp.dll"

which the compiler recognizes. The line where this occurs looks like this:

let new_object = new fsharp.type(Observable<csharp.type>)

Where I'm creating an object defined in fsharp.dll which takes an observer of a type defined in csharp.dll. When I try to run it in FSharp interactive, I get the following error:

error FS0074: The type referenced through 'csharp.type' is defined in an assembly that is not referenced. You must add a reference to assembly 'csharp'.

The thing that doesn't make sense is that csharp.type had been used successfully in a previous line. But when we introduce the csharp.type with an fsharp.type, I get an error all of a sudden saying the csharp type is missing an assembly reference, even though the problem seems to be with the fsharp.type.

Upvotes: 0

Views: 1163

Answers (2)

Robert Jeppesen
Robert Jeppesen

Reputation: 7877

@Petr is correct. You need to add all references, and their references.

If you are using Visual Studio, I suggest that you install Visual F# Power Tools. When installed, right-click 'References' under your project and choose to 'Generate references for F# interactive'.

This will generate (and keep updated!) the files

  • {ProjRoot}/Scripts/load-references.fsx
  • {ProjRoot}/Scripts/load-project.fsx

So in your F# script (assuming it is in the project root), you just do

#load "Scripts/load-project.fsx"

These generated files should go into your version control of choice.

Upvotes: 1

Petr
Petr

Reputation: 4280

It seems you'll need also refer in the script System.Reactive.dll or wherever the class Observable<T> is defined

Upvotes: 1

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