FluentValidation
6 sectionsRapid overview
FluentValidation
TL;DR
FluentValidation is a popular .NET library for building strongly-typed validation rules using a fluent API. It separates validation rules from models and supports composition, async checks, localization, and easy testing.
Read →How it works
This note covers how to use FluentValidation properly and what a senior C#/.NET developer needs to know: core concepts, best practices, integration with ASP.NET Core, testing, performance, and advanced extension points.
Read →Common pitfalls
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Read →Quick recall Q&A
Q: When should you reach for FluentValidation over data annotations? A: When validation is complex, needs async checks, localization, or cross-field logic. FluentValidation keeps rules in dedicated classes, making them testable and composab…
Read →See also
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Read →Additional notes
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