The namespace 'namespace' already contains a definition for 'classname'

[bklebe]

I'm using OmniSharp Emacs from MELPA on Windows and Mac with Flycheck and I get a bunch of these lints in every C# buffer that I open, including saying that methods are ambiguous between the two classes and so forth. I am quite certain I haven't actually duplicated every class in my project. I've tried it with VSCode and I can get the same error if I edit the buffer, and it's fixed by doing "Restart OmniSharp" in the C-S-p menu. (dotnet/vscode-csharp#785) I have tried restarting the server in Emacs and this does not appear to fix the problem. Any ideas?

[ForLoveOfCats]

#464

[bklebe]

Ah, thank you. Sorry for duplicating.

[razzmatazz]

No problem. As this is starting to bug people I think I need to take a look at this sooner.

This has started to happen since the update to one of the versions in 1.32.x series of the omnisharp-roslyn server.

A workaround for the time being is to set the variable omnisharp-expected-server-version to some version lower than (1.32.6) – I don't remember correctly which one – and invoke M-x omnisharp-install-server.

You can set this variable via:

• a (setq ...) in your /.emacs.d/init.elor.spacemacs` file, or
• M-x customize-variable

[bklebe]

I've been getting quite good at Emacs Lisp lately, if this is something you'd like help with. I typically use JetBrains Rider or Visual Studio 2017 but I miss my Emacs keybinds and magit and everything, so I'm trying to make my setup for .NET development work in my favorite Unix text editor ;). Thank you so much for making this work in Emacs!

[razzmatazz]

@beeuhtricks welcome! I am half a noob too and willing to help/guide if you want to do a PR.

[bklebe]

@razzmatazz I would love to do a PR. Reading #464 it seems like the solution is to block on interacting with the server until it has loaded the project. At a guess this would entail putting all the code that interacts with the server in a block and making sure it has logic to interact synchronously with the server? I know Emacs Lisp doesn't really have threads.

[razzmatazz]

(I will answer in #464)