[C#] Add .editorconfig to C# code

[asfimport]

This allows for a consistent code format throughout the C# code in the repo. That way when a new contributor submits a change, the editors will automatically format the code to be in the same format as the current code base.

Reporter: Eric Erhardt / @eerhardt
Assignee: Eric Erhardt / @eerhardt

PRs and other links:

• GitHub Pull Request #7246

_{Note: This issue was originally created as ARROW-8882. Please see the migration documentation for further details.}

[asfimport]

Adam Szmigin / @mr-smidge:
Is there a strong opinion on .editorconfig as opposed to, say, StyleCop Analyzers?

[asfimport]

Eric Erhardt / @eerhardt:
In general they work together. See https://docs.microsoft.com/en-us/visualstudio/code-quality/analyzers-faq?view=vs-2019. With .edtiorconfig you can specify more settings than just StyleCop.

 

[asfimport]

Eric Erhardt / @eerhardt:
I also learned through doing this work that if you want to fail the build on violations, you need to use some roslyn analyzer (like StyleCop). I'm not sure failing the build on style violations is a great experience, so I didn't enable it with this work. This issue is just to establish the style used in the project and set the .editorconfig settings.

[asfimport]

Eric Erhardt / @eerhardt:
Issue resolved by pull request 7246
#7246