FluentValidation 8.6.2

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

There is a newer prerelease version of this package available.
See the version list below for details.
Install-Package FluentValidation -Version 8.6.2
dotnet add package FluentValidation --version 8.6.2
<PackageReference Include="FluentValidation" Version="8.6.2" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add FluentValidation --version 8.6.2
The NuGet Team does not provide support for this client. Please contact its maintainers for support.

Release Notes

FluentValidation 8 is a major release. Please read the upgrade notes at https://fluentvalidation.net/upgrading-to-8

Changes in 8.6.2:
* Ensure CollectionIndex works in async workflow.

Changes in 8.6.1:
* Added explicit netcoreapp3.1 target to the ASP.NET Core integration.

Changes in 8.6.0:
* Add support for ASP.NET Core 3.1
* Fixed issue with property indexers being incorrectly stripped out when using test extensions.
* AddToModelState no longer includes a dot if PropertyName is null

Changes in 8.5.1:
* Ensure lazily loaded calls to WithMessage can be used for client-side validation, provided they don't attempt to access model properties from inside the delegate (eg when using IStringLocalizer).
* Fix issue where OnFailure didn't work properly when invoked on validators with conditions.

Changes in 8.5.0:
* Add additional overload of the EmailAddress validator for compatibility with ASP.NET Core's default email validation.
* Simplify the advanced testhelper syntax.
* Add support for ASP.NET Core 3.
* Add support for defining child rules inline.
* ValidatorDescriptor now has consistent handling of model-level rules.
* RuleForEach can now access collection index in error message with {CollectionIndex} placeholder.
* Welsh language translations of default error messages.
* Hungrian language translations of default error messages.
* Indonesian language translations of default error messages.
* Using RuleForEach combined with When is now more intuitive.
* Fixed order of rule execution when using async validation.

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

Showing the top 10 GitHub repositories that depend on FluentValidation:

Repository Stars
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Read more about the GitHub Usage information on our documentation.

Version History

Version Downloads Last updated
9.0.0-preview3 4,185 2/29/2020
9.0.0-preview2 2,856 2/21/2020
9.0.0-preview1 5,549 2/8/2020
8.6.2 140,808 2/29/2020
8.6.1 1,020,130 12/28/2019
8.6.0 636,886 12/4/2019
8.5.1 703,462 11/2/2019
8.5.0 1,104,474 9/24/2019
8.5.0-preview5 34,292 9/1/2019
8.5.0-preview4 56,207 7/23/2019
8.5.0-preview3 24,768 7/10/2019
8.5.0-preview2 32,182 6/13/2019
8.5.0-preview1 36,532 5/10/2019
8.4.0 3,903,176 5/10/2019
8.3.0 459,005 4/24/2019
8.2.3 232,158 4/12/2019
8.2.2 363,069 4/5/2019
8.2.1 60,825 4/4/2019
8.2.0 380,526 3/26/2019
8.1.3 2,273,082 1/25/2019
8.1.2 935,052 12/18/2018
8.1.1 248,228 12/11/2018
8.1.0 176,016 12/6/2018
8.1.0-preview2 24,501 11/14/2018
8.1.0-preview1 24,731 10/14/2018
8.0.101 322,267 11/24/2018
8.0.100 1,675,839 9/4/2018
8.0.0 375,434 8/16/2018
8.0.0-rc1 33,159 7/24/2018
8.0.0-preview4 21,531 7/16/2018
8.0.0-preview3 20,405 7/13/2018
8.0.0-preview2 20,159 7/13/2018
7.6.105 312,366 8/11/2018
7.6.104 1,234,748 7/6/2018
7.6.103 532,721 6/16/2018
7.6.102 129,392 6/14/2018
7.6.101 50,977 6/13/2018
7.6.100 93,598 6/7/2018
7.6.0 206,481 6/1/2018
7.6.0-preview1 29,267 4/12/2018
7.5.2 1,489,669 3/16/2018
7.5.1 118,206 3/11/2018
7.5.0 403,777 2/26/2018
7.4.0 579,689 1/26/2018
7.3.4 480,558 1/2/2018
7.3.3 118,619 12/22/2017
7.3.2 39,791 12/21/2017
7.3.1 147,968 12/13/2017
7.3.0 29,151 12/13/2017
7.3.0-beta3 24,897 12/8/2017
7.3.0-beta2 34,975 11/20/2017
7.3.0-beta1 21,847 11/11/2017
7.2.1 1,199,105 10/24/2017
7.2.0 408,878 10/5/2017
7.2.0-beta3 37,155 9/5/2017
7.2.0-beta2 23,399 8/22/2017
7.2.0-beta1 20,377 8/19/2017
7.1.1 878,932 7/25/2017
7.1.0 283,868 6/28/2017
7.1.0-beta1 20,225 6/24/2017
7.0.3 218,130 6/7/2017
7.0.2 144,551 5/26/2017
7.0.1 54,356 5/23/2017
7.0.0 175,946 5/19/2017
7.0.0-beta3 24,042 5/1/2017
7.0.0-beta2 23,831 4/17/2017
7.0.0-beta1 21,356 4/7/2017
6.4.1 580,018 3/15/2017
6.4.1-beta1 21,121 3/13/2017
6.4.0 422,810 3/3/2017
6.4.0-rc4 142,125 2/13/2017
6.4.0-rc3 29,554 2/3/2017
6.4.0-rc2 36,294 1/30/2017
6.4.0-rc1 20,216 1/30/2017
6.4.0-beta9 74,245 11/21/2016
6.4.0-beta8 45,189 10/31/2016
6.4.0-beta7 20,774 10/28/2016
6.4.0-beta6 21,186 10/25/2016
6.4.0-beta5 20,887 10/24/2016
6.4.0-beta4 20,903 10/21/2016
6.4.0-beta3 61,446 7/4/2016
6.4.0-beta2 21,737 7/1/2016
6.4.0-beta10 20,074 1/30/2017
6.4.0-beta1 23,869 6/28/2016
6.3.4-alpha 182,142 6/1/2016
6.3.3-alpha 20,491 5/27/2016
6.2.1 1,947,479 2/26/2016
6.2.1-beta1 24,259 2/24/2016
6.2.0 65,306 2/22/2016
6.2.0-beta1 20,514 2/12/2016
6.1.0 218,919 1/18/2016
6.0.2 82,463 1/5/2016
6.0.1 32,363 1/5/2016
6.0.0 56,902 12/22/2015
5.6.2 705,269 5/29/2015
5.6.1 26,061 5/29/2015
5.5.0 529,482 10/31/2014
5.4.0 302,810 7/3/2014
5.3.0 71,102 5/27/2014
5.2.0 44,249 5/21/2014
5.1.0 311,635 3/11/2014
5.0.0.1 180,790 10/24/2013
4.0.0.1 148,741 7/18/2013
4.0.0 81,377 4/29/2013
3.4.6 198,575 8/30/2012
3.4.0 45,049 8/17/2012
3.3.1 39,259 3/30/2012
3.2.0 52,390 11/14/2011
3.1.0 46,301 7/30/2011
3.0.0.1 22,266 7/5/2011
3.0.0 24,450 6/25/2011
2.0.0 37,424 1/9/2011
1.3.0 38,641 1/7/2011