FluentValidation 8.5.0-preview1

A validation library for .NET that uses a fluent interface to construct strongly-typed validation rules.

No packages depend on FluentValidation.

FluentValidation 8 is a major release. Please read the upgrade notes at https://fluentvalidation.net/upgrading-to-8 Changes in 8.4.0: * Added simplified version of several messages across all translations to aid with ASP.NET Clientside validation. * New enum validator for string properties. Changes in 8.3.0: * Fix issue in ASP.NET Core integration with GetServiceProvider not working correctly when invoked against a CustomContext/MessageBuilderContext. * Improved how LanguageStringSource works with error-code overrides. * Fix thread-safety issue with use of PropertyValidatorOptions.Empty (now removed). * Improved how calls to When/Unless are handled internally. * DelegatingValidator is now marked as deprecated. * Improvements to Croatian language translations. * Improvements to Georgian language translations. * Resolved subtle bug where top-level WhenAsync wouldn't work correctly when wrapping a top-level call to When. Changes in 8.2.3: * Fix issue in WebApi integration where DataAnnotations validators could generate duplicate messages when in the same project as FluentValidation. Changes in 8.2.2: * Fix FluentValidation.DependencyInjection package name. Changes in 8.2.1: * Resolved issue using InjectValidator with RuleForEach. * Add support for a default IValidatorInterceptor to be registered with the ASP.NET Core Service Provider. Changes in 8.2.0: * Add extensions for injecting child validators using the ASP.NET Core Service Provider. * Implement RuleFor(...).ForEach(...) as an alternative to RuleForEach. * WithLocalizedMessage is deprecated. Use the overload of WithMessage that takes a Func instead. Changes in 8.1.3: * Resolved issue where clientside validation was incorrectly generating metadata for rules with shared conditions. * ScalePrecisionValidator now has a public method in the fluent interface. * Fix placeholder names in ScalePrecisionValidator for consistency. * Updates to Portuguese (Brazil) translations. Changes in 8.1.2: * Fix issue where shared When/Unless conditions didn't execute correctly when used with RuleForEach. Changes in 8.1.1: * Added RuleSetsExecuted property on ValidationResult. * Resolved issue introduced in 8.1 where the shared condition cache does not work correctly with RuleForEach (#970). Changes in 8.1: * Add format support in message placeholders. * Added support for overriding indexers for collection rules. * Allow error codes to be used to override localization key in the Language Manager. * Additional error details are now shown in the ShouldNotHaveValidationErrorFor test extension. * Conditions defined with root-level When/WhenAsync/Unless/UnlessAsync are now only executed once (instead of once for each rule). * Support Otherwise method chained from root-level When/WhenAsync/Unless/UnlessAsync. * Minor wording changes to default English error messages. * Japanese translation of the default error messages. * Added Skip property to MVC5's CustomizeValidatorAttribute for parity with AspNetCore and WebApi. * Remove type constraint on the OverridePropertyName overload that takes an expression. Added Skip property to MVC5's CustomizeValidatorAttribute to bring parity with AspNetCore and WebApi integration. Changes in 8.0: * Support validating only specific properties by path. * Added OnFailure method * Deprecated RuleFor(..).SetCollectionValidator in favour of RuleForEach(...).SetValidator * IStringSource.GetString now takes a validation context instead of a model instance. * Introduce PropertyValidatorOptions in order to clean up the IPropretyValidator interface. * Moved the legacy ValidatorAttribute and AttributedValidatorFactory into a separate FluentValidation.Attributes package. * Remove the pre-7.0 localization mechanism * Remove the pre-7.0 methods for custom validation * Removed many other deprecated methods Full release notes can be found at https://github.com/JeremySkinner/FluentValidation/blob/master/Changelog.txt

Version Downloads Last updated
12.0.0 15 5/8/2025
12.0.0-preview1 23 2/18/2025
11.11.0 20 2/19/2025
11.10.0 22 10/1/2024
11.9.2 22 7/20/2024
11.9.1 24 5/3/2024
11.9.0 25 3/8/2024
11.8.1 27 3/8/2024
11.8.0 22 3/8/2024
11.7.1 22 3/8/2024
11.7.0 22 3/8/2024
11.6.0 28 2/27/2024
11.5.2 30 3/8/2024
11.5.1 24 3/8/2024
11.5.0 26 3/6/2024
11.4.0 30 3/8/2024
11.3.0 22 3/8/2024
11.2.2 27 3/8/2024
11.2.1 22 3/8/2024
11.2.0 26 2/12/2024
11.1.1 23 3/8/2024
11.1.0 29 3/3/2024
11.0.3 29 3/8/2024
11.0.2 22 3/8/2024
11.0.1 29 3/2/2024
11.0.0 25 2/27/2024
10.4.0 25 2/26/2024
10.3.6 24 3/8/2024
10.3.5 23 3/8/2024
10.3.4 25 3/8/2024
10.3.3 24 3/8/2024
10.3.1 31 3/8/2024
10.3.0 28 2/11/2024
10.2.3 23 3/8/2024
10.2.2 23 3/1/2024
10.2.1 26 3/2/2024
10.2.0 23 2/10/2024
10.1.0 27 3/8/2024
10.0.4 29 3/7/2024
9.5.4 25 3/8/2024
9.5.3 22 3/8/2024
9.5.2 29 3/8/2024
9.5.1 28 3/8/2024
9.5.0 29 3/8/2024
9.4.0 28 3/8/2024
9.3.0 28 2/28/2024
9.3.0-preview3 29 2/27/2024
9.3.0-preview2 30 4/12/2022
9.3.0-preview1 25 3/8/2024
9.2.2 51 3/8/2024
9.2.1 27 3/8/2024
9.2.0 33 2/11/2024
9.1.3 20 3/1/2024
9.1.2 25 2/10/2024
9.1.1 23 2/21/2024
9.1.0 29 3/1/2024
9.0.1 27 3/8/2024
9.0.0-preview5 22 3/8/2024
9.0.0-preview4 29 3/8/2024
9.0.0-preview3 28 3/8/2024
9.0.0-preview2 26 3/8/2024
9.0.0-preview1 24 3/8/2024
8.6.3 29 3/8/2024
8.6.2 29 3/8/2024
8.6.1 27 3/8/2024
8.6.0 26 2/23/2024
8.5.1 27 2/23/2024
8.5.0 27 3/4/2024
8.5.0-preview5 29 3/8/2024
8.5.0-preview4 21 3/8/2024
8.5.0-preview3 27 3/8/2024
8.5.0-preview2 21 3/8/2024
8.5.0-preview1 27 3/8/2024
8.4.0 28 3/8/2024
8.3.0 23 3/8/2024
8.2.3 22 3/8/2024
8.2.2 27 3/8/2024
8.2.1 25 3/8/2024
8.2.0 23 3/8/2024
8.1.3 22 3/8/2024
8.1.2 24 3/8/2024
8.1.1 22 2/10/2024
8.1.0 28 3/4/2024
8.1.0-preview2 23 3/8/2024
8.1.0-preview1 27 3/8/2024
8.0.101 26 3/8/2024
8.0.100 24 3/8/2024
8.0.0 23 3/5/2024
8.0.0-rc1 28 3/8/2024
8.0.0-preview4 26 3/8/2024
8.0.0-preview3 31 3/8/2024
8.0.0-preview2 30 2/29/2024
7.6.105 26 3/8/2024
7.6.104 26 3/8/2024
7.6.103 27 3/8/2024
7.6.102 28 3/8/2024
7.6.101 27 3/3/2024
7.6.100 27 3/8/2024
7.6.0 29 3/8/2024
7.6.0-preview1 24 3/8/2024
7.5.2 23 3/8/2024
7.5.1 23 2/24/2024
7.5.0 31 3/8/2024
7.4.0 22 3/7/2024
7.3.4 23 3/8/2024
7.3.3 23 3/8/2024
7.3.2 26 3/8/2024
7.3.1 26 3/8/2024
7.3.0 29 3/8/2024
7.3.0-beta3 24 3/8/2024
7.3.0-beta2 25 3/8/2024
7.3.0-beta1 23 3/8/2024
7.2.1 25 3/8/2024
7.2.0 24 2/26/2024
7.2.0-beta3 26 3/8/2024
7.2.0-beta2 20 3/8/2024
7.2.0-beta1 22 3/8/2024
7.1.1 23 3/8/2024
7.1.0 25 3/8/2024
7.1.0-beta1 26 3/8/2024
7.0.3 27 3/8/2024
7.0.2 23 3/8/2024
7.0.1 28 3/8/2024
7.0.0 26 3/8/2024
7.0.0-beta3 24 3/8/2024
7.0.0-beta2 23 3/8/2024
7.0.0-beta1 23 3/8/2024
6.4.1 24 3/8/2024
6.4.1-beta1 29 3/8/2024
6.4.0 25 3/8/2024
6.4.0-rc4 31 3/8/2024
6.4.0-rc3 26 3/8/2024
6.4.0-rc2 28 3/8/2024
6.4.0-rc1 26 3/8/2024
6.4.0-beta9 22 3/8/2024
6.4.0-beta8 23 3/8/2024
6.4.0-beta7 25 3/8/2024
6.4.0-beta6 24 3/8/2024
6.4.0-beta5 27 3/8/2024
6.4.0-beta4 25 3/8/2024
6.4.0-beta3 23 3/8/2024
6.4.0-beta2 28 3/8/2024
6.4.0-beta10 24 3/8/2024
6.4.0-beta1 22 3/8/2024
6.3.4-alpha 22 3/2/2024
6.3.3-alpha 26 3/8/2024
6.2.1 28 3/8/2024
6.2.1-beta1 29 3/8/2024
6.2.0 20 3/8/2024
6.2.0-beta1 23 3/8/2024
6.1.0 28 3/8/2024
6.0.2 24 3/8/2024
6.0.1 28 3/8/2024
6.0.0 24 3/8/2024
5.6.2 26 3/8/2024
5.6.1 26 3/8/2024
5.5.0 23 3/8/2024
5.4.0 28 3/2/2024
5.3.0 27 3/8/2024
5.2.0 27 3/8/2024
5.1.0 27 3/6/2024
5.0.0.1 22 2/11/2024
4.0.0.1 25 2/10/2024
4.0.0 23 3/8/2024
3.4.6 26 3/8/2024
3.4.0 24 3/8/2024
3.3.1 21 3/8/2024
3.2.0 30 3/3/2024
3.1.0 27 3/8/2024
3.0.0.1 29 2/10/2024
3.0.0 22 3/8/2024
2.0.0 30 3/8/2024
1.3.0 25 3/8/2024