VSCode with C# extension works, but not omnisharp-vim for same solution file

[sim590]

I have a solution file that I try to load with Omnisharp-vim on Windows. The solution loads, but intelisense doesn't work a specific project. However, when opening the same solution with VSCode, it works. I'm asking for help to understand how to make it work on Neovim. I want to know what I'm not doing correctly.

I have attached the omnisharp-vim log:

omnisharp-vim.log

I have attached the VSCode log here:

vscode-omnisharp.log

Keep in mind that I had to change some names to keep company sensitive information private.

So, when I try to navigate to code definition within the same project MyCompany.MyMonolithProject.ModuleThatDoesntLoadPorperly, it fails. It also fails to navigate to code outside of that project when I try to hit the definition of the word from within a file of that module.

In VSCode, everything works correctly with the same solution file.

If that's a configuration issue, I'd like to know. I know that I had to configure VSCode's C# plugin to uncheck this:

To have it to work in VSCode. I think it's because we target .NETFramework4.6.2.

I want to specify that omnisharp-vim seems to only have issues with definitions from MyCompany.MyMonolithProject.ModuleThatDoesntLoadPorperly and it works properly for other projects within the same solution.

For the record, I did install omnisharp-rosly with let g:OmniSharp_server_use_net6 = 0.

I do use the following vimscript that I source while opening Vim:

let g:OmniSharp_find_solution = { bufnr -> 'C:\\SomeName\\Depots\\MyMonolithProject\\SomeDirectory\\MyCompany.MyMonolithProject.ExtensionManager\\MyCompany.MyMonolithProject.ExtensionManager.local.sln' }

Also, the ResolveComReference also happens in VSCode, so I don't think that it explains the issue.

I'm a bit lost as to why this project is causing issues.

[nickspoons]

It doesn't look like the project is loading properly in either editor - the vscode log is still showing a lot of reference errors and warnings, about missing references to .NETFramework,Version=v4.5, as well as the ResolveComReference error.

It's hard to compare because vscode no longer uses omnisharp-roslyn as its language server, MS have created a new language server. So I don't know if that language server is "working", or if it is able to provide basic completions despite not being fully loaded? Can it actually find references and usages, hover documentation etc.?

If I were you I'd concentrate on those framework mis-matches. It looks like some of your projects target 4.5 and others target 4.6.2 and that is causing problems. Does it all compile?

[sim590]

It's hard to compare because vscode no longer uses omnisharp-roslyn as its language server, MS have created a new language server.

Interesting. I assumed it was still using the same. That's why I phrased my issue like I did. I'm sorry for overlooking this.

So I don't know if that language server is "working", or if it is able to provide basic completions despite not being fully loaded? Can it actually find references and usages, hover documentation etc.?

Yes, I can jump to definitions. See documentation of functions. Find references. All the good stuff I want.

If I were you I'd concentrate on those framework mis-matches. It looks like some of your projects target 4.5 and others target 4.6.2 and that is causing problems. Does it all compile?

It compiles correctly in Visual Studio.

[sim590]

I apparently uploaded the wrong omnisharp-vim.log. I changed it.

But, I see what you are saying about the .NETFramework version mis-matches. I didn't see that at first.

omnisharp-vim.log

Here is another log that doesn't have those warnings. Not sure why I had them before, but now that I don't, I still can't jump on definitions in that project. But I can jump on function definitions in other projects (same solution, but other projects).

[nickspoons]

This one isn't showing errors because it isn't loading any projects. I don't know why.

Workspace complete: no projects

You can see in the body of the /projects response that the Body.MsBuild.Projects array is empty. If you compare that with the previous log you had posted you can see the contrast. So something has changed there.

[sim590]

omnisharp-vim.log

My error. Again. Sorry. I was using a omnisharp.json file. It was causing issues.

Now, it should be OK. Still can't navigate code within that project.

[sim590]

OK, I just made a breakthrough:

Removing this from the csproj file made it work:

<ItemGroup>
  <COMReference Include="Shell32">
    <Guid>{50A7E9B0-70EF-11D1-B75A-00A0C90564FE}</Guid>
    <VersionMajor>1</VersionMajor>
    <VersionMinor>0</VersionMinor>
    <Lcid>0</Lcid>
    <WrapperTool>tlbimp</WrapperTool>
    <Isolated>False</Isolated>
    <EmbedInteropTypes>True</EmbedInteropTypes>
  </COMReference>
</ItemGroup>

So it seems that omnisharp-roslyn really has an issue with finding the reference to the COM thing. Not sure how to fix that.

[nickspoons]

Might be worth comparing the output of running omnisharp-roslyn directly in the solution directory (on the command line, not from vim), and compare the output with and without that ComReference. It looks like a server issue rather than an omnisharp-vim issue.

[sim590]

Actually, I think that the issue seems to be the same as I was having here:

OmniSharp/omnisharp-roslyn#2174

It never got resolved.

[sim590]

Might be worth comparing the output of running omnisharp-roslyn directly in the solution directory (on the command line, not from vim), and compare the output with and without that ComReference. It looks like a server issue rather than an omnisharp-vim issue.

The only noticable difference seems to be those lines:

{"Event":"log","Body":{"LogLevel":"ERROR","Name":"OmniSharp.MSBuild.ProjectLoader","Message":"Impossible d'instancier la tâche \"ResolveComReference\" à partir de \"Microsoft.Build.Tasks.Core, Version=15.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a\". Impossible de charger le fichier ou l'assembly 'Microsoft.Build, Version=15.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' ou une de ses dépendances. Le fichier spécifié est introuvable."},"Seq":139,"Type":"event"}
{"Event":"log","Body":{"LogLevel":"ERROR","Name":"OmniSharp.MSBuild.ProjectLoader","Message":"La tâche \"ResolveComReference\" a été déclarée ou utilisée de manière incorrecte, ou a échoué pendant la construction. Vérifiez l'orthographe du nom de la tâche et de l'assembly."},"Seq":140,"Type":"event"}
{"Event":"log","Body":{"LogLevel":"WARNING","Name":"OmniSharp.MSBuild.ProjectManager","Message":"Failed to load project file 'C:\\SomePath\\Depots\\MyMonolithProject\\SomeDirectory\\MyCompany.MyMonolithProject.ModuleThatDoesntLoadPorperly\\MyCompany.MyMonolithProject.ModuleThatDoesntLoadPorperly.csproj'."},"Seq":141,"Type":"event"}