Choosing a kernel should provide a reasonable default language for cells in a new notebook.

Environment data

• VS Code version: 1.53.0-insiders
• Jupyter Extension version (available under the Extensions sidebar):v2020.12.414227025
• Python Extension version (available under the Extensions sidebar): Python isn’t installed
• OS (Windows | Mac | Linux distro) and version: Windows 10
• Python and/or Anaconda version: Isn’t installed
• Type of virtual environment used (N/A | venv | virtualenv | conda | …): N/A
• Jupyter server running: N/A
• .NET Interactive extension: v1.0.207203

Expected behaviour

Once the user selects the one of a .Net Interactive kernel is selected from the kernel picker I expect the kernel to be recognize it. This only happens in the initial install of .NET Interactive but, doesn’t work in a new instance of VS Code.

Actual behaviour

The .NET Interactive kernel isn’t recognized in new VS Code instance. The user can select one of the .NET Interactive kernels however, when they hit the run button you are promoted to “Select a kernel to run the notebook”

Steps to reproduce:

Opening a New Notebook

• Open a new window in VS Code Ctrl + Shift + N
• Opened a new notebook - Using the Jupyter
• Cell default to a non .NET Interactive kernel what kernel is it looking at ?
• Switching to C# .NET Interactive by clicking on the c# label. .
• Selected C# .NET Interactive hit run and promoted to select a kernel

Logs

Output for Jupyter in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Jupyter)

XXX

[DonJayamanne]

@DavidKutu Please make note of the changes from displayName to title

[DonJayamanne]

We’re going to have to make changes to the API to make this possible.

• Rather than getting .net to call our API registerNewNotebookContent
  • We will query all extensions & check if they contribute to us (read package.json and look for their contributions & update the list of the notebooks in the quick pick
• Modify CreationOptions.registrations in src/client/datascience/notebook/creation/creationOptionsService.ts
  • Read package.json of other extensions using vscode.extensions.all.filter(item => item.packageJSON?.contributes?['jupyter.kernels'].....

contributes: {
  jupyter.kernels: [
    {
      title: ".NET Interactive Notebook (C#)",
      defaultlanguage: "dotnet-interactive.csharp" // this is how our special languages register with vscode
    } ,
    {
      title: ".NET Interactive Notebook (F#)",
      defaultlanguage: "dotnet-interactive.fsharp"
    }
  ]
}

Note sure we need kernelId (I’d personally remove that as we don’t need it)