Add reference to netstandard to prevent issues "You must add a reference to assembly netstandard"?

[matthid]

Description

Expected behavior

Intellisense works.

Actual behavior

See screenshot

Known workarounds

Potentially adding #r "netstandard"

Most portable workaround:

#if !FAKE
  #r "netstandard" // windows
  #r "Facades/netstandard" // mono
#endif

[kblohm]

Just an FYI as i have the same problem right now, the workaround for me is

#if !FAKE
  #r "netstandard"
#endif

otherwise i get intellisense but FAKE complains about Multiple references to 'netstandard.dll' are not permitted

[matthid]

Yes that is the correct workaround I have used as well for the same reason. I guess now that we all have this in place we might as well add it to the intellisense_lazy.fsx file :)

I was a bis hesitant because older editors might choke at that line.

[kblohm]

Not sure if this is related, but i tried to use Newtonsoft.Json.Linq and i get:

A reference to the type 'System.Dynamic.IDynamicMetaObjectProvider' in assembly 'System.Core' was found, but the type could not be found in that assembly

Compiles just fine, but intellisense is broken.

[matthid]

Interesting because I thought we emit framework assemblies into the intellisense file as well. But maybe we just miss them for some reason

[kblohm]

Intellisense_lazy.fsx does contain System.Core. A minimal example is working here at home, so it might not be a FAKE problem at all. My computer at work might have some super old .net version installed and #r might just load an old version then.

[matthid]

Yes only netstandard is missing, correct? Thinking about this maybe this is a paket issue. Question is how do we know that we have to reference netstandard. Probably once we use a netstandard dll paket should have that logic

[kblohm]

Yes thats the only one missing. Do you know of a way to deal with #r to load a specific version? You can probably always reference the dll directly. But maybe that problem is so uncommon its not worth doing something about it. Who still has .net 3.5 sdk installed.. :)

[matthid]

I don't think you can get it running smoothly with .net3.5 :P
But afaik it will always prefer the first referenced version.

[HoraceGonzalez]

Just for the record, referencing the netstandard reference library this way didn't fix the issue for me:

#if !FAKE
  #r "netstandard"
#endif

I had to provide the explicit path to a newer, 4.7.1 facade assembly to get it to work. Eg.

#if !FAKE
#r "/usr/lib/mono/4.7.1-api/Facades/netstandard.dll"
#endif

[csmager]

As I mentioned in ionide/ionide-vscode-fsharp#839 (comment), I think you'll find that this works for mono:

#if !FAKE
  #r "Facades/netstandard"
#endif

[matthid]

I'm addressing this here for Visual Studio Code: ionide/FsAutoComplete#402
I do not plan to address this for Visual Studio, but there is already an issue open

Therefore I'm closing this now. I thought about this several times and there is just no good way to address this in FAKE itself.