Update analyzers for C# 14.0 language version checks#1159
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Sergio0694 merged 2 commits intomainfrom Feb 2, 2026
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Replaced preview language version checks with explicit C# 14.0 or greater checks using HasLanguageVersionAtLeastEqualTo when available. This ensures analyzers correctly handle new language versioning and maintain compatibility with Roslyn 5.0.0 or greater.
Introduces new unit tests under the ROSLYN_5_0_0_OR_GREATER conditional to verify analyzer diagnostics and code generation behavior when using C# 14. These tests ensure correct warnings are produced for observable properties and WinRT compatibility in this language version.
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Pull request overview
Updates analyzer language-version gating so analyzers that depend on partial-properties behavior trigger correctly when using Roslyn 5.0 with LangVersion=14.0 (not just Preview), and adds coverage for the C# 14 case.
Changes:
- Add C# 14.0-specific unit tests (guarded by
ROSLYN_5_0_0_OR_GREATER) to ensure expected diagnostics are produced. - Update analyzers to treat C# 14.0+ as satisfying the “partial properties available” requirement when building against Roslyn 5.0.
- Add conditional
Microsoft.CodeAnalysis.CSharpimports where needed forLanguageVersion.CSharp14.
Reviewed changes
Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.
| File | Description |
|---|---|
| tests/CommunityToolkit.Mvvm.SourceGenerators.Roslyn4120.UnitTests/Test_SourceGeneratorsDiagnostics.cs | Adds LanguageVersion.CSharp14 test cases under Roslyn 5.0 to validate analyzer behavior. |
| src/CommunityToolkit.Mvvm.SourceGenerators/Diagnostics/Analyzers/WinRTObservablePropertyOnFieldsIsNotAotCompatibleAnalyzer.cs | Switches the “stop early” language-version check to C# 14+ for Roslyn 5.0, preserving Preview behavior for older Roslyn. |
| src/CommunityToolkit.Mvvm.SourceGenerators/Diagnostics/Analyzers/UseObservablePropertyOnSemiAutoPropertyAnalyzer.cs | Updates the analyzer’s language-version gate to allow C# 14+ under Roslyn 5.0 (instead of requiring Preview). |
| src/CommunityToolkit.Mvvm.SourceGenerators/Diagnostics/Analyzers/UseObservablePropertyOnPartialPropertyAnalyzer.cs | Updates the analyzer’s language-version gate to allow C# 14+ under Roslyn 5.0 (instead of requiring Preview). |
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Hi. Thanks for working on this issue. Is there an ETA for a release that includes this PR? |
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I'm hoping to be able to get to this later today 🙂 |
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Fixes some analyzers not triggering correctly with Roslyn 5.0 when using C# 14.0.
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