StyleCopAnalyzers VS csharplang

By default, Renovate ignores preview versions of dependencies. For NuGet, a preview version is a package whose version contains a semantic suffix such as -alpha, -beta, -rc. There are some well-known NuGet packages that are only available in preview versions. For example, Aspire.Hosting will likely remain in preview until the release of .NET 9, StyleCop.Analyzers has been in beta for already 5 years, while OpenTelemetry.Instrumentation.GrpcNetClient and Azure.AI.OpenAI have never had a stable version.

Several well-known NuGet packages such as xUnit.net, FluentAssertions, StyleCop, Entity Framework Core, and others include by default a significant number of Roslyn analyzers. They help you adhere to the conventions and best practices of these libraries.

I created a StyleCopAnalysers.ruleset file at the root of my project, which contains the ruleset for analysis. The tool not only identifies issues but also attempts to fix them, providing a log of any unresolved problems. In addition to running the analyzer upon build, the dotnet format command also runs any external analyzers that it detects by default as well.

https://github.com/DotNetAnalyzers/StyleCopAnalyzers the successor to stylecop - most of the rules ported over

I'm a C# guy, so that is what I care about. For .NET we do have StyleCop analyzers. And EditorConfig exists to help at the IDE level across all languages. And git itself can be configured with such things as eol and autoclrf.

I'd also like to know how to clean up based on rules like SA1507 - never more than one blank line in a row, and related rules to remove blank likes after { and before }

StyleCop is from Microsoft: https://github.com/DotNetAnalyzers/StyleCopAnalyzers

Using their own APIs, Roslyn Analyzers verifies certain conditions about the source code and, if necessary, feeds back into the compiler in the form of compilation warnings and errors. An example would be StyleCop.

StyleCop.Analyzers

Not exactly related to conversation but given that you mentioned (discriminated) unions, here are notes on recent design work:

https://github.com/dotnet/csharplang/blob/main/meetings/2024...

https://github.com/dotnet/csharplang/blob/main/meetings/2024...

Certain parts of Microsoft Learn are permissive, for example the .NET BCL documentation is Creative Commons Attribution: https://github.com/dotnet/dotnet-api-docs as is ASP.NET Core: https://github.com/dotnet/AspNetCore.Docs (a good hint if documentation is permissively licensed and on GitHub is if there's an edit button at the top.)

The C# language specification is unfortunately a bit fuzzier: https://github.com/dotnet/csharplang/discussions/4855

The updated unified C# language specification is CC, but it's still catching up to modern C#: https://github.com/dotnet/csharpstandard

No OP, but for example you still see the C# folks still struggling to add discriminated unions to the language because of complex interactions due to its too many features[1]. Virtual threads are easier to use than async/await is another example.

[1] https://github.com/dotnet/csharplang/issues/113

For example, C# had a research fork called Spec# that had compile-time support for contracts, with keywords such as requires (for arguments) and ensures (for return values), all the way back in 2004. While still being discussed, it doesn't seem to be shipping any time soon.

Hi there. I'm the language designer who created the 'Collection Expression' design/specification: https://github.com/dotnet/csharplang/issues/5354

You can see the entire history of the proposal there. To answer you specific question, we went with `..` because that's what the language already uses for the complimentary 'pattern matching deconstruction' form for collection patterns.

In other words, you can already say this today:

    if (x is [var start, .. var middle, .. var end]) { ... }

You must specify concrete type.

There was a plan to have "natural type" so "var list = [1,2,3]" would be of type "List" but it was postponed to C# 13 (https://github.com/dotnet/csharplang/issues/5354#issuecommen...)

While C# currently lacks direct support for this kind of functionality, there's a glimmer of hope with an active proposal under discussion that aims to bring this feature to the language. This potential addition promises a future where C# can natively offer similar robust type narrowing.

Given few people anticipated ValueTuple and C# adding a more direct tuple syntax, I feel like it is only a matter of time before C# adds discriminated unions.

(There are multiple proposals tracking the idea. This seems the most comprehensive and "central": https://github.com/dotnet/csharplang/issues/7016)

I always liked list abbreviations in python, but I absolutely love Linq. I believe there is a feature proposal for C# 12, which makes collection initialization better imo.