#r is unable to load an assembly that's already on disk about interactive HOT 6 CLOSED

@tparviainen,

I am afraid this is due to a difference between C# and F# #r syntax.

In C# #r is followed by a directive string which doesn't require escaping on the \ characters.

In F# #r is followed by a string which requires \ to be escaped I'e \.

However, that is somewhat annoying so instead often we use @ strings, which are similar to directive strings in C#.

So your code would become:

#r @"C:\Users\tomip\.nuget\packages\newtonsoft.json\12.0.2\lib\netstandard2.0\Newtonsoft.Json.dll"

And that should work fine.

Kevin

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@KevinRansom

The change you described, once implemented, will it also impact to #load or #r only? What about csx files that are #load'ed to Jupyter and that contain #r directives should those #r directives be with @ or without?

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I'm not certain @ is the issue here. (which actually makes the import fail under C#)

I see the following using the C# kernel:

#r "C:/Users/Mehmet/.nuget/packages/newtonsoft.json/12.0.2/lib/netstandard2.0/Newtonsoft.Json.dll"

Invalid: Command: #r C:/Users/Mehmet/.nuget/packages/newtonsoft.json/12.0.2/lib/netstandard2.0/Newtonsoft.Json.dll

However ironically, it does load the DLL, you can refer to the namespace(s) and use included types. One big caveat: completion only works when typing using but not for anything else that involves types from the DLL.

.NET Core SDK: 3.0.100
dotnet-try: 1.0.19555.1+ee3dc325df2fb737bc0af13bbdd9927a9360e59a

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@mehmetakbulut

fsi and csi are different scripting languages and there exists prior art, that we will require to be compatible with, as to what is valid in #r and #load arguments.

In F# the provided line can be:
1:

#r C:\\Users\\tomip\\.nuget\\packages\\newtonsoft.json\\12.0.2\\lib\\netstandard2.0\\Newtonsoft.Json.dll"

2:

#r @"C:\Users\tomip\.nuget\packages\newtonsoft.json\12.0.2\lib\netstandard2.0\Newtonsoft.Json.dll"

3:

#r """C:\Users\tomip\.nuget\packages\newtonsoft.json\12.0.2\lib\netstandard2.0\Newtonsoft.Json.dll"""

4:

C:/Users/tomip/.nuget/packages/newtonsoft.json/12.0.2/lib/netstandard2.0/Newtonsoft.Json.

The invalid command in your C# example is a bug in the C# #r command handler certainly we expect #r with valid linux path chars to work. Please raise a separate issue for that to avoid confusion.

In F# #r and #load strings both will require escaped strings or @"" that conform to the existing fsi script language.

C# will undoubtedly continue to use directive strings, to conform with the existing csi scripting language.

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@KevinRansom That makes sense. Will create a separate issue.

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