Anthony Giretti • 11/23/2025

C# 14: Modifiers on simple lambda parameters without explicit parameter types

This article details a new C# 14 feature enabling developers to apply parameter modifiers (ref, in, out, scoped, ref readonly) on simple lambda parameters without specifying the explicit type. It explains the syntax, provides code examples comparing old and new usage, and discusses practical use cases in performance-oriented or ref-heavy code, such as when working with Span<T> or library development.

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#c #Language Features #Lambda Expressions