runtime
https://github.com/dotnet/runtime
C#
.NET is a cross-platform runtime for cloud, mobile, desktop, and IoT apps.
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- Issues
- [API Proposal]: Add string.ReplaceWhere for predicate-based replacement and removal
- [Perf] Windows/x64: 4 Regressions on 7/3/2026 10:18:16 AM +00:00
- [Perf] Windows/x64: 1 Regression on 6/28/2026 5:31:55 PM +00:00
- Improve `GetChildren` / `GetChildKeys` performance for large configurations
- [API Proposal]: Custom converters for external types in `System.Text.Json` source generation
- JIT: Rematerialize spilled FP/SIMD/mask constants instead of stack spill/reload
- JIT: Reuse enregistered FP/SIMD/mask constants across non-last uses
- Add basic handling of OptimizationPreference for crossgen2 on mobile r2r
- Add an exploration for generic bridging and extraction
- [OptionsValidator] source generator: emit ValidateAsync() for IAsyncValidateOptions<T>
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- C# not yet supported