FluentValidation 9.0.0-preview3

Prefix Reserved
.NET Standard 2.0 This package targets .NET Standard 2.0. The package is compatible with this framework or higher. .NET Framework 4.6.1 This package targets .NET Framework 4.6.1. The package is compatible with this framework or higher.
This is a prerelease version of FluentValidation.
There is a newer version of this package available.
See the version list below for details. 
dotnet add package FluentValidation --version 9.0.0-preview3                

                    
                

            
NuGet\Install-Package FluentValidation -Version 9.0.0-preview3
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="FluentValidation" Version="9.0.0-preview3" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
paket add FluentValidation --version 9.0.0-preview3                

                    
                

            
#r "nuget: FluentValidation, 9.0.0-preview3"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
// Install FluentValidation as a Cake Addin
#addin nuget:?package=FluentValidation&version=9.0.0-preview3&prerelease

// Install FluentValidation as a Cake Tool
#tool nuget:?package=FluentValidation&version=9.0.0-preview3&prerelease

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

Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed.  net9.0 was computed.  net9.0-android was computed.  net9.0-browser was computed.  net9.0-ios was computed.  net9.0-maccatalyst was computed.  net9.0-macos was computed.  net9.0-tvos was computed.  net9.0-windows was computed. 
.NET Core netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 was computed. 
.NET Framework net461 is compatible.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

  • .NETFramework 4.6.1

    • No dependencies.

  • .NETStandard 2.0

    • No dependencies.

NuGet packages (2.4K)

Showing the top 5 NuGet packages that depend on FluentValidation:

Package Downloads
FluentValidation.DependencyInjectionExtensions

Dependency injection extensions for FluentValidation
FluentValidation.AspNetCore

AspNetCore integration for FluentValidation
MicroElements.Swashbuckle.FluentValidation

Swagger ISchemaFilter that uses FluentValidation validators instead System.ComponentModel based attributes.
Ocelot

Ocelot is an API gateway based on .NET stack.
Reo.Core.Validation

Package Description

GitHub repositories (231)

Showing the top 5 popular GitHub repositories that depend on FluentValidation:

Repository Stars
abpframework/abp
Open-source web application framework for ASP.NET Core! Offers an opinionated architecture to build enterprise software solutions with best practices on top of the .NET. Provides the fundamental infrastructure, cross-cutting-concern implementations, startup templates, application modules, UI themes, tooling and documentation.
aspnetboilerplate/aspnetboilerplate
ASP.NET Boilerplate - Web Application Framework
kgrzybek/modular-monolith-with-ddd
Full Modular Monolith application with Domain-Driven Design approach.
Sonarr/Sonarr
Smart PVR for newsgroup and bittorrent users.
Radarr/Radarr
Movie organizer/manager for usenet and torrent users.
Version Downloads Last updated
12.0.0-preview1 15,408 1/2/2025
11.11.0 5,830,098 11/16/2024
11.10.0 9,088,559 9/15/2024
11.9.2 15,876,578 6/10/2024
11.9.1 8,691,954 4/23/2024
11.9.0 23,664,511 12/21/2023
11.8.1 6,491,403 11/22/2023
11.8.0 7,416,712 10/19/2023
11.7.1 9,684,079 8/12/2023
11.7.0 110,488 8/11/2023
11.6.0 7,394,970 7/4/2023
11.5.2 16,503,280 4/7/2023
11.5.1 42,775,511 2/20/2023
11.5.0 2,280,884 2/13/2023
11.4.0 16,974,977 11/23/2022
11.3.0 3,191,397 11/10/2022
11.2.2 14,643,305 9/11/2022
11.2.1 20,905,500 8/28/2022
11.2.0 7,136,943 8/8/2022
11.1.1 594,782 8/6/2022
11.1.0 11,997,716 6/22/2022
11.0.3 3,214,716 6/10/2022
11.0.2 4,700,060 5/27/2022
11.0.1 6,181,332 5/7/2022
11.0.0 5,225,063 4/30/2022
10.4.0 18,494,493 3/11/2022
10.3.6 25,016,993 12/13/2021
10.3.5 3,038,343 11/30/2021
10.3.4 9,547,446 10/22/2021
10.3.3 11,158,818 8/24/2021
10.3.1 692,660 8/19/2021
10.3.0 7,891,135 7/9/2021
10.2.3 7,843,042 6/3/2021
10.2.2 436,159 6/1/2021
10.2.1 1,304,863 5/30/2021
10.2.0 359,055 5/28/2021
10.1.0 5,070,619 4/28/2021
10.0.4 4,041,706 4/17/2021
9.5.4 5,512,240 4/5/2021
9.5.3 3,891,073 3/15/2021
9.5.2 1,881,176 3/8/2021
9.5.1 6,497,801 2/11/2021
9.5.0 3,133,398 1/31/2021
9.4.0 2,953,587 1/14/2021
9.3.0 13,921,711 11/10/2020
9.3.0-preview3 38,213 10/19/2020
9.3.0-preview2 148,327 9/15/2020
9.3.0-preview1 13,143 8/26/2020
9.2.2 6,911,383 9/20/2020
9.2.1 28,497 9/19/2020
9.2.0 7,599,998 8/26/2020
9.1.3 1,004,966 8/19/2020
9.1.2 924,889 8/12/2020
9.1.1 656,316 8/8/2020
9.1.0 201,894 8/8/2020
9.0.1 5,229,676 7/14/2020
9.0.0-preview5 88,858 5/23/2020
9.0.0-preview4 140,574 4/22/2020
9.0.0-preview3 196,953 2/29/2020
9.0.0-preview2 32,194 2/21/2020
9.0.0-preview1 96,206 2/8/2020
8.6.3 6,692,565 8/28/2020
8.6.2 27,024,621 2/29/2020
8.6.1 12,290,533 12/28/2019
8.6.0 4,119,042 12/4/2019
8.5.1 3,722,341 11/2/2019
8.5.0 6,022,203 9/24/2019
8.5.0-preview5 68,126 9/1/2019
8.5.0-preview4 96,121 7/23/2019
8.5.0-preview3 31,606 7/10/2019
8.5.0-preview2 80,422 6/13/2019
8.5.0-preview1 59,811 5/10/2019
8.4.0 13,881,098 5/10/2019
8.3.0 3,907,899 4/24/2019
8.2.3 674,587 4/12/2019
8.2.2 1,016,038 4/5/2019
8.2.1 466,261 4/4/2019
8.2.0 1,049,037 3/26/2019
8.1.3 5,043,026 1/25/2019
8.1.2 2,305,354 12/18/2018
8.1.1 586,867 12/11/2018
8.1.0 706,358 12/6/2018
8.1.0-preview2 29,189 11/14/2018
8.1.0-preview1 27,628 10/14/2018
8.0.101 869,309 11/24/2018
8.0.100 3,865,749 9/4/2018
8.0.0 1,073,469 8/16/2018
8.0.0-rc1 53,108 7/24/2018
8.0.0-preview4 25,612 7/16/2018
8.0.0-preview3 24,118 7/13/2018
8.0.0-preview2 23,899 7/13/2018
7.6.105 1,635,174 8/11/2018
7.6.104 2,729,140 7/6/2018
7.6.103 1,270,863 6/16/2018
7.6.102 324,419 6/14/2018
7.6.101 76,066 6/13/2018
7.6.100 173,032 6/7/2018
7.6.0 392,192 6/1/2018
7.6.0-preview1 49,613 4/12/2018
7.5.2 3,796,073 3/16/2018
7.5.1 264,582 3/11/2018
7.5.0 739,738 2/26/2018
7.4.0 1,983,851 1/26/2018
7.3.4 1,056,684 1/2/2018
7.3.3 185,635 12/22/2017
7.3.2 72,427 12/21/2017
7.3.1 330,921 12/13/2017
7.3.0 108,446 12/13/2017
7.3.0-beta3 27,989 12/8/2017
7.3.0-beta2 46,033 11/20/2017
7.3.0-beta1 24,953 11/11/2017
7.2.1 2,791,967 10/24/2017
7.2.0 810,058 10/5/2017
7.2.0-beta3 41,341 9/5/2017
7.2.0-beta2 27,132 8/22/2017
7.2.0-beta1 23,396 8/19/2017
7.1.1 2,070,854 7/25/2017
7.1.0 546,376 6/28/2017
7.1.0-beta1 23,145 6/24/2017
7.0.3 742,644 6/7/2017
7.0.2 281,074 5/26/2017
7.0.1 85,680 5/23/2017
7.0.0 667,859 5/19/2017
7.0.0-beta3 27,750 5/1/2017
7.0.0-beta2 26,819 4/17/2017
7.0.0-beta1 24,377 4/7/2017
6.4.1 1,828,217 3/15/2017
6.4.1-beta1 23,510 3/13/2017
6.4.0 925,644 3/3/2017
6.4.0-rc4 146,092 2/13/2017
6.4.0-rc3 39,198 2/3/2017
6.4.0-rc2 39,490 1/30/2017
6.4.0-rc1 23,280 1/30/2017
6.4.0-beta9 90,767 11/21/2016
6.4.0-beta8 50,291 10/31/2016
6.4.0-beta7 23,909 10/28/2016
6.4.0-beta6 24,243 10/25/2016
6.4.0-beta5 23,821 10/24/2016
6.4.0-beta4 23,935 10/21/2016
6.4.0-beta3 70,805 7/4/2016
6.4.0-beta2 24,796 7/1/2016
6.4.0-beta10 23,015 1/30/2017
6.4.0-beta1 28,104 6/28/2016
6.3.4-alpha 410,195 6/1/2016
6.3.3-alpha 22,826 5/27/2016
6.2.1 5,091,402 2/26/2016
6.2.1-beta1 28,242 2/24/2016
6.2.0 163,311 2/22/2016
6.2.0-beta1 24,097 2/12/2016
6.1.0 409,261 1/18/2016
6.0.2 113,817 1/5/2016
6.0.1 38,967 1/5/2016
6.0.0 126,945 12/22/2015
5.6.2 1,496,988 5/29/2015
5.6.1 33,954 5/29/2015
5.5.0 1,165,834 10/31/2014
5.4.0 593,815 7/3/2014
5.3.0 103,163 5/27/2014
5.2.0 74,795 5/21/2014
5.1.0 989,685 3/11/2014
5.0.0.1 502,964 10/24/2013
4.0.0.1 290,160 7/18/2013
4.0.0 115,053 4/29/2013
3.4.6 400,225 8/30/2012
3.4.0 67,546 8/17/2012
3.3.1 86,194 3/30/2012
3.2.0 73,333 11/14/2011
3.1.0 52,490 7/30/2011
3.0.0.1 25,977 7/5/2011
3.0.0 44,447 6/25/2011
2.0.0 73,095 1/9/2011
1.3.0 272,854 1/7/2011

FluentValidation 9 is a major release. Please read the upgrade notes at https://docs.fluentvalidation.net/en/latest/upgrading-to-9.html

Changes in 9.0.0:
* Removed support for netstandard1.1 and netstandard1.6
* Default email validation mode now uses the same logic as ASP.NET Core. Previous regex behaviour is opt-in.
* TestHelper advanced mode now has more features (see https://docs.fluentvalidation.net/en/latest/testing.html#advanced-test-extensions)
* Equal/NotEqual now perform ordinal comparison when used with string properties
* Severity can now be set dynamically with a callback
* Removed WithLocalizedMessage (WithMessage that takes a callback is the replacement)
* Removed ResourceName from ValidationFailure
* Removed ResourceName and ResourceType from IStringSource.
* Removed SetCollectionValidator which was deprecated in 8.0
* Additional overload of OnAnyFailure that can receive a collection of validation failures
* Remove DisplayAttribute integration and reference to DataAnnotations.
* ComparisonProperty placeholder is now formatted like PropertyName
* Translations of default error messages into other languages are now lazily-loaded
* Added Slovenian translations of default error messages.
* Added WithMessageArgument to the test helpers.
* Add additional overload of SetValidator that takes a Func that receives the current property value.
* ASP.NET Core: FluentValidationModelValidatorProvider and FluentValidationModelValidator are now public.
* Work around a bug in ASP.NET Core's integration testing components that can cause ConfigureServices to run multiple times.
* SourceLink integration.
* {CollectionIndex} placeholder can now be accessed in child validators.

Full release notes can be found at https://github.com/FluentValidation/FluentValidation/blob/master/Changelog.txt
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