FluentValidation 9.0.0-preview3
Prefix ReservedSee the version list below for details.
dotnet add package FluentValidation --version 9.0.0-preview3
NuGet\Install-Package FluentValidation -Version 9.0.0-preview3
<PackageReference Include="FluentValidation" Version="9.0.0-preview3" />
<PackageVersion Include="FluentValidation" Version="9.0.0-preview3" />
<PackageReference Include="FluentValidation" />
paket add FluentValidation --version 9.0.0-preview3
#r "nuget: FluentValidation, 9.0.0-preview3"
#:package FluentValidation@9.0.0-preview3
#addin nuget:?package=FluentValidation&version=9.0.0-preview3&prerelease
#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 | Versions 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. net10.0 was computed. net10.0-android was computed. net10.0-browser was computed. net10.0-ios was computed. net10.0-maccatalyst was computed. net10.0-macos was computed. net10.0-tvos was computed. net10.0-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. |
-
.NETFramework 4.6.1
- No dependencies.
-
.NETStandard 2.0
- No dependencies.
NuGet packages (3.0K)
Showing the top 5 NuGet packages that depend on FluentValidation:
| Package | Downloads |
|---|---|
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FluentValidation.DependencyInjectionExtensions
Dependency injection extensions for FluentValidation |
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FluentValidation.AspNetCore
AspNetCore integration for FluentValidation |
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Reo.Core.DataModels
Package Description |
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Ocelot
Ocelot is an API gateway based on .NET stack. |
|
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Reo.Core.Validation
Package Description |
GitHub repositories (263)
Showing the top 20 popular GitHub repositories that depend on FluentValidation:
| Repository | Stars |
|---|---|
|
ardalis/CleanArchitecture
Clean Architecture Solution Template: A proven Clean Architecture Template for ASP.NET Core 10
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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.
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kgrzybek/modular-monolith-with-ddd
Full Modular Monolith application with Domain-Driven Design approach.
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Sonarr/Sonarr
Smart PVR for newsgroup and bittorrent users.
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Radarr/Radarr
Movie organizer/manager for usenet and torrent users.
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aspnetboilerplate/aspnetboilerplate
ASP.NET Boilerplate - Web Application Framework
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dotnet-architecture/eShopOnWeb
Sample ASP.NET Core 8.0 reference application, now community supported: https://github.com/NimblePros/eShopOnWeb
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MudBlazor/MudBlazor
Blazor Component Library based on Material Design principles with an emphasis on ease of use and extensibility
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ThreeMammals/Ocelot
.NET API Gateway
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NancyFx/Nancy
Lightweight, low-ceremony, framework for building HTTP based services on .Net and Mono
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EduardoPires/EquinoxProject
Web Application ASP.NET 9 using Clean Architecture, DDD, CQRS, Event Sourcing and a lot of good practices
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canton7/SyncTrayzor
Windows tray utility / filesystem watcher / launcher for Syncthing
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Prowlarr/Prowlarr
Prowlarr is an indexer manager/proxy built on the popular *arr .net/reactjs base stack to integrate with your various PVR apps, supporting management of both Torrent Trackers and Usenet Indexers.
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FastEndpoints/FastEndpoints
A light-weight REST API development framework for ASP.NET 8 and newer.
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jasontaylordev/NorthwindTraders
Northwind Traders is a sample application built using ASP.NET Core and Entity Framework Core.
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Lidarr/Lidarr
Looks and smells like Sonarr but made for music.
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microsoft/RulesEngine
A fast and reliable .NET Rules Engine with extensive Dynamic expression support
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fullstackhero/blazor-starter-kit
Clean Architecture Template for Blazor WebAssembly Built with MudBlazor Components.
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Megabit/Blazorise
Blazorise is a component library built on top of Blazor with support for CSS frameworks like Bootstrap, Tailwind, Bulma, AntDesign, and Material.
|
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Readarr/Readarr
Book Manager and Automation (Sonarr for Ebooks)
|
| Version | Downloads | Last Updated |
|---|---|---|
| 12.1.1 | 5,585,090 | 12/3/2025 |
| 12.1.0 | 4,206,006 | 11/3/2025 |
| 12.0.0 | 27,309,130 | 5/5/2025 |
| 12.0.0-preview1 | 320,743 | 1/2/2025 |
| 11.12.0 | 803,887 | 11/3/2025 |
| 11.11.0 | 61,737,033 | 11/16/2024 |
| 11.10.0 | 23,847,661 | 9/15/2024 |
| 11.9.2 | 30,859,358 | 6/10/2024 |
| 11.9.1 | 15,752,888 | 4/23/2024 |
| 11.9.0 | 37,539,793 | 12/21/2023 |
| 11.8.1 | 10,842,085 | 11/22/2023 |
| 11.8.0 | 10,857,740 | 10/19/2023 |
| 11.7.1 | 12,896,815 | 8/12/2023 |
| 11.7.0 | 155,201 | 8/11/2023 |
| 11.6.0 | 9,918,672 | 7/4/2023 |
| 11.5.2 | 21,537,708 | 4/7/2023 |
| 11.5.1 | 75,377,644 | 2/20/2023 |
| 11.5.0 | 3,514,146 | 2/13/2023 |
| 11.4.0 | 21,261,852 | 11/23/2022 |
| 9.0.0-preview3 | 212,533 | 2/29/2020 |
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