Error CS0006: Metadata file 'nuget: <...>' could not be found when loading a C# script (*.csx) referencing nuget package

[Oblomoff]

Description

• I have a notebook file (*.ipynb or *.dib)
• I have a C# script file (*.csx) referencing nuget package
• The notebook loads that file
• I get an error CS0006: Metadata file 'nuget: <...>' could not be found"

F# scripts are loaded fine

Example

See example project: NotebooksBug.zip

script.csx

#r "nuget: MathNet.Numerics, 5.0.0"
using System;
string Hello() => "Hello from C# script!";

notebook.ipynb

#r "nuget: MathNet.Numerics, 5.0.0"
#load "script.csx"
Hello()

c:\Users\...\NotebooksBug\script.csx(1,1): error CS0006: Metadata file 'nuget: MathNet.Numerics, 5.0.0' could not be found

.NET Interactive

• Version: 1.0.355206+4dcedd96b3252430822b3cf1591e7f4031b0df56
• Library version: 1.0.0-beta.22552.6+4dcedd96b3252430822b3cf1591e7f4031b0df56
• Build date: 2022-11-03T04:46:59.8757048Z

Environment

• OS: Windows 11
• Browser: Edge
• Frontend: Visual Studio Code

[brettfo]

This is a subtle difference between the C# Script, F# Script, and notebook dialect. F# directly allows "#r "nuget:...", as does the notebook, but from a pure .csx viewpoint, that's not allowed as a part of the language.

#load ... isn't handled by .NET Interactive, it's instead passed directly to C# as a compiler directive.

If the gesture was instead #!import ... this should work as is.

[ronnieoverby]

So... how do you work around this? I installed .NET 8 SDK and VS Code in a fresh windows 11 sandbox and get this error.

[jonsequitur]

It looks like you have a space before the #r line. Removing that space should solve it.