Reft client from C# library project reports runtime error [... doesn't look like a Refit interface] in C# cells, while works for F#

[konst-sh]

Describe the bug

I have a C# class library project which uses Refit package to generate some web api client. When I was trying to reference that client in C# notebook I'm getting the error saying that client interface doesn't look like Refit interface. If I switch the language to F# I'm able to create the client object and perform API calls in notebook. Here is the repo with sample project and test notebook: https://github.com/konst-sh/Netinteractive_Reft_issue

Please complete the following:

Which version of .NET Interactive are you using? (In a notebook, run the #!about magic command. ): Version: 1.0.556301+aa2c36d2531670229bd0ba9e7fa330e70cb5eb5d Library version: 1.0.0-beta.24563.1+aa2c36d2531670229bd0ba9e7fa330e70cb5eb5d Build date: 2024-11-14T11:26:58.6533506Z

• OS
  • [+] Windows 11
  • [ ] Windows 10
  • [ ] macOS
  • [ ] Linux (Please specify distro)
  • [ ] iOS
  • [ ] Android
• Browser
  • [ ] Chrome
  • [ ] Edge
  • [ ] Firefox
  • [ ] Safari
• Frontend
  • [ ] Jupyter Notebook
  • [ ] Jupyter Lab
  • [ ] nteract
  • [+] Visual Studio Code
  • [ ] Visual Studio Code Insiders
  • [ ] Visual Studio
  • [ ] Other (please specify)

Screenshots

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[jonsequitur]

This is more than likely an issue with how Refit generates code. I suspect it's not accounting for C# Script (where Roslyn source generators aren't supported), but I don't know enough about how it generates code to say for certain.

[konst-sh]

@jonsequitur but why it works in F# then? I assume that source generators only run at compile time and once dll is created it must be agnostic to it. We are in stupid situation when F# doesn't support Refit because of lack of source generation but F# script can execute refit - referencing dll, while C# script can't execute native dll compiled in C#

[jonsequitur]

but why it works in F# then?

I don't know enough about the source generation implementations in Refit to answer that. Since F# doesn't support source generators, it could be that there's an alternative strategy in the implementation, which if this is the case would probably work for C# Script as well.

I'm guessing -- again, just an educated guess without more information about Refit and I only glanced at the code there for a few minutes -- but I'm guessing that the issue isn't that C# Script can't run the dll so much as that the Refit code doesn't account for the fact that in C# Script, there's no build process in place to trigger source generation. I'm sure this can be fixed but it would have to be fixed in the Refit code, possibly by detecting that C# Script or .NET Interactive is the driver and adjusting the strategy accordingly.