Omnisharp doesn't start up when c# project is in OneDrive folder with "File On-Demand" on

[RickyLin]

Environment data

dotnet --info output: 2.0.2
VS Code version: 1.17.2
C# Extension version: 1.12.1
Windows Version: Windows 10 1709 (OS Build 16299.19) It has a new OneDrive feature "File On-Demand"

Steps to reproduce

1. Close all VS Code windows/applications if any.
2. Make sure the OneDrive Setting "Files On-Demand" is on.
   
3. Create a simple "Hello World" console app in OneDrive folder: dotnet new console
   
4. Open the new created project in VS Code, open "Program.cs" file

Expected behavior

OmniSharp should start up.

I moved the "HelloWorld" project out of OneDrive folder, then it worked.

Actual behavior

OmniSharp doesn't start up.

Visual Studio 2017 has similar problem when a project is in OneDrive folder no matter if "File On-Demand" is on or off. I guess Omnisharp would not start up as long as the project is in OneDrive folder even if "File On-Demand" is off.

[DustinCampbell]

FWIW, this is probably an issue for VS Code and not OmniSharp or C# for VS Code. I would expect a fix to support OneDrive "File-On-Demand" would be handled invisibly for VS Code extensions. It looks like there has been some traffic in VS Code issues on this problem. @bpasero, @jrieken -- do you know anything about this?

[bpasero]

@DustinCampbell yes, we had to pull in a fix from libuv in order to get this right (see microsoft/vscode#27285). It should be fixed in VS Code since 1.17.2 though, so that is weird...

[DustinCampbell]

This is with OneDrive's new "Files-on-Demand" feature. Are you certain that's fixed?

[DustinCampbell]

FWIW, I had heard recently that OneDrive feature also doesn't work in VS. My assumption is that the feature just shipped more broadly

[bpasero]

This is with OneDrive's new "Files-on-Demand" feature. Are you certain that's fixed?

Yes, I am. Unless another Windows or OneDrive update caused the bug to appear again. If that was the case however, we could hear about it in VS Code issue tracker very quickly.

Is it possible to get an actual error message to understand what goes wrong?

[RickyLin]

@bpasero How can I get something such as logs or error messages from VS Code or OmniSharp? I opened output window and the dropdown only contains "Extensions", "Search", "Tasks" and "Git".

[RickyLin]

In addition, I only selected a few of OneDrive folders synchronized to local computer, this was configured before upgrading to Windows 10 1709 (was 1703).

[pmalecka]

Same on my end, vscode x64 1.18.0

[mmgil]

same situation here.

in VSCode and in Visual Studio Community 2017

[marco-carvalho]

i'm having this problem right now; when I open the solution with VSCode on Ubuntu, Omnisharp doesn't start, but when I do it on Windows, it works

edit: holy hell, i just figured that this configs on the settings of VSCode were making Omnisharp not working:

"files.exclude": {
    "**/obj": true,
    "**/bin": true,
    "**/*.csproj": true,
}

[JoeRobich]

Closing as a lot has improved with VS Code and the C# extension since this issue was opened.