Steven Giesel 5/19/2025

Writing new guards with extensions in C# 14

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This technical article details a new feature in C# 14 that allows developers to extend type definitions with functions. It demonstrates how to create custom argument validation guards (like ThrowIfHasOneCharacter) that integrate seamlessly with existing ArgumentException helpers, providing a native look and feel for parameter validation in methods.

Writing new guards with extensions in C# 14

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