pattern vs. prefer naming

[MisinformedDNA]

The documentation says the rule name is csharp_style_pattern_local_over_anonymous_function and that's what works for me in VS 2022 17.0.4, but the Roslyn code base changed the name to csharp_style_prefer_local_over_anonymous_function. When is the latter used over the former?

@CyrusNajmabadi

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Document Details

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• ID: 0006eb1d-a4f7-89be-e1d4-19e207970235
• Version Independent ID: fbf6f148-1752-a8dc-a55c-694dac925c58
• Content: IDE0039: Use local function instead of lambda - .NET
• Content Source: docs/fundamentals/code-analysis/style-rules/ide0039.md
• Product: dotnet-fundamentals
• GitHub Login: @gewarren
• Microsoft Alias: gewarren

[CyrusNajmabadi]

The documentation says the rule name is csharp_style_pattern_local_over_anonymous_function and that's what works for me

that name was simply a mistake (due to a copy/paste error). It was always supposed to be be 'prefer_X_over_Y' as that is what we use elsewhere. The 'pattern' part was copied from another config key errantly.

[MisinformedDNA]

Yes, it's a good fix, but 'pattern' is still recognized in VS, but 'prefer' is not. Is a future version of VS needed for 'prefer' to be recognized?

[CyrusNajmabadi]

You'll need 17.1 to pick this up. Thanks!

[cremor]

@MisinformedDNA Why did you close this issue? The documentation was not updated for the new rule name.

[gewarren]

This was fixed by #30059.