FluentValidation 9.0.0-preview4

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There is a newer version of this package available.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-preview4                

                    
                

            
NuGet\Install-Package FluentValidation -Version 9.0.0-preview4
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-preview4" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
paket add FluentValidation --version 9.0.0-preview4                

                    
                

            
#r "nuget: FluentValidation, 9.0.0-preview4"
#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-preview4&prerelease

// Install FluentValidation as a Cake Tool
#tool nuget:?package=FluentValidation&version=9.0.0-preview4&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. 
.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 (224)

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 88 1/2/2025
11.11.0 2,353,752 11/16/2024
11.10.0 7,230,743 9/15/2024
11.9.2 14,187,331 6/10/2024
11.9.1 7,941,367 4/23/2024
11.9.0 22,331,972 12/21/2023
11.8.1 6,044,777 11/22/2023
11.8.0 7,127,623 10/19/2023
11.7.1 9,384,215 8/12/2023
11.7.0 108,235 8/11/2023
11.6.0 7,174,285 7/4/2023
11.5.2 16,054,822 4/7/2023
11.5.1 39,842,982 2/20/2023
11.5.0 2,241,003 2/13/2023
11.4.0 16,592,434 11/23/2022
11.3.0 3,120,088 11/10/2022
11.2.2 14,388,022 9/11/2022
11.2.1 20,522,088 8/28/2022
11.2.0 7,044,775 8/8/2022
11.1.1 582,437 8/6/2022
11.1.0 11,789,217 6/22/2022
11.0.3 3,153,805 6/10/2022
11.0.2 4,581,388 5/27/2022
11.0.1 6,092,542 5/7/2022
11.0.0 5,030,129 4/30/2022
10.4.0 18,143,837 3/11/2022
10.3.6 24,673,680 12/13/2021
10.3.5 3,009,088 11/30/2021
10.3.4 9,420,444 10/22/2021
10.3.3 11,038,841 8/24/2021
10.3.1 685,163 8/19/2021
10.3.0 7,801,034 7/9/2021
10.2.3 7,758,383 6/3/2021
10.2.2 432,279 6/1/2021
10.2.1 1,290,314 5/30/2021
10.2.0 352,172 5/28/2021
10.1.0 5,006,391 4/28/2021
10.0.4 4,010,877 4/17/2021
9.5.4 5,311,695 4/5/2021
9.5.3 3,860,690 3/15/2021
9.5.2 1,856,571 3/8/2021
9.5.1 6,449,106 2/11/2021
9.5.0 3,081,703 1/31/2021
9.4.0 2,926,901 1/14/2021
9.3.0 13,737,118 11/10/2020
9.3.0-preview3 37,809 10/19/2020
9.3.0-preview2 147,264 9/15/2020
9.3.0-preview1 13,082 8/26/2020
9.2.2 6,866,750 9/20/2020
9.2.1 27,881 9/19/2020
9.2.0 7,551,194 8/26/2020
9.1.3 1,001,345 8/19/2020
9.1.2 919,276 8/12/2020
9.1.1 653,473 8/8/2020
9.1.0 191,028 8/8/2020
9.0.1 5,200,017 7/14/2020
9.0.0-preview5 88,594 5/23/2020
9.0.0-preview4 140,474 4/22/2020
9.0.0-preview3 195,567 2/29/2020
9.0.0-preview2 32,167 2/21/2020
9.0.0-preview1 95,258 2/8/2020
8.6.3 6,522,375 8/28/2020
8.6.2 26,786,124 2/29/2020
8.6.1 12,163,689 12/28/2019
8.6.0 4,084,206 12/4/2019
8.5.1 3,695,904 11/2/2019
8.5.0 5,939,269 9/24/2019
8.5.0-preview5 67,714 9/1/2019
8.5.0-preview4 95,058 7/23/2019
8.5.0-preview3 31,558 7/10/2019
8.5.0-preview2 78,678 6/13/2019
8.5.0-preview1 59,239 5/10/2019
8.4.0 13,755,527 5/10/2019
8.3.0 3,876,428 4/24/2019
8.2.3 668,231 4/12/2019
8.2.2 1,001,878 4/5/2019
8.2.1 459,259 4/4/2019
8.2.0 1,041,647 3/26/2019
8.1.3 5,018,024 1/25/2019
8.1.2 2,291,882 12/18/2018
8.1.1 583,375 12/11/2018
8.1.0 693,955 12/6/2018
8.1.0-preview2 29,172 11/14/2018
8.1.0-preview1 27,607 10/14/2018
8.0.101 855,441 11/24/2018
8.0.100 3,839,399 9/4/2018
8.0.0 1,062,901 8/16/2018
8.0.0-rc1 52,923 7/24/2018
8.0.0-preview4 25,592 7/16/2018
8.0.0-preview3 24,108 7/13/2018
8.0.0-preview2 23,886 7/13/2018
7.6.105 1,607,019 8/11/2018
7.6.104 2,716,637 7/6/2018
7.6.103 1,262,748 6/16/2018
7.6.102 319,223 6/14/2018
7.6.101 75,927 6/13/2018
7.6.100 171,688 6/7/2018
7.6.0 389,193 6/1/2018
7.6.0-preview1 49,179 4/12/2018
7.5.2 3,770,064 3/16/2018
7.5.1 262,122 3/11/2018
7.5.0 736,435 2/26/2018
7.4.0 1,937,599 1/26/2018
7.3.4 1,048,504 1/2/2018
7.3.3 184,909 12/22/2017
7.3.2 72,188 12/21/2017
7.3.1 327,788 12/13/2017
7.3.0 105,427 12/13/2017
7.3.0-beta3 27,975 12/8/2017
7.3.0-beta2 45,826 11/20/2017
7.3.0-beta1 24,941 11/11/2017
7.2.1 2,772,964 10/24/2017
7.2.0 805,341 10/5/2017
7.2.0-beta3 41,319 9/5/2017
7.2.0-beta2 27,117 8/22/2017
7.2.0-beta1 23,365 8/19/2017
7.1.1 2,037,278 7/25/2017
7.1.0 544,475 6/28/2017
7.1.0-beta1 23,132 6/24/2017
7.0.3 738,691 6/7/2017
7.0.2 280,255 5/26/2017
7.0.1 84,087 5/23/2017
7.0.0 657,147 5/19/2017
7.0.0-beta3 27,738 5/1/2017
7.0.0-beta2 26,807 4/17/2017
7.0.0-beta1 24,367 4/7/2017
6.4.1 1,788,788 3/15/2017
6.4.1-beta1 23,502 3/13/2017
6.4.0 912,840 3/3/2017
6.4.0-rc4 146,080 2/13/2017
6.4.0-rc3 39,190 2/3/2017
6.4.0-rc2 39,478 1/30/2017
6.4.0-rc1 23,270 1/30/2017
6.4.0-beta9 90,706 11/21/2016
6.4.0-beta8 50,276 10/31/2016
6.4.0-beta7 23,879 10/28/2016
6.4.0-beta6 24,189 10/25/2016
6.4.0-beta5 23,801 10/24/2016
6.4.0-beta4 23,917 10/21/2016
6.4.0-beta3 70,723 7/4/2016
6.4.0-beta2 24,786 7/1/2016
6.4.0-beta10 23,005 1/30/2017
6.4.0-beta1 28,095 6/28/2016
6.3.4-alpha 406,868 6/1/2016
6.3.3-alpha 22,817 5/27/2016
6.2.1 5,041,974 2/26/2016
6.2.1-beta1 28,231 2/24/2016
6.2.0 162,648 2/22/2016
6.2.0-beta1 24,087 2/12/2016
6.1.0 406,550 1/18/2016
6.0.2 113,420 1/5/2016
6.0.1 38,882 1/5/2016
6.0.0 125,750 12/22/2015
5.6.2 1,477,953 5/29/2015
5.6.1 33,901 5/29/2015
5.5.0 1,158,070 10/31/2014
5.4.0 590,466 7/3/2014
5.3.0 102,800 5/27/2014
5.2.0 74,398 5/21/2014
5.1.0 980,322 3/11/2014
5.0.0.1 497,847 10/24/2013
4.0.0.1 287,558 7/18/2013
4.0.0 114,028 4/29/2013
3.4.6 397,951 8/30/2012
3.4.0 66,979 8/17/2012
3.3.1 85,628 3/30/2012
3.2.0 72,889 11/14/2011
3.1.0 52,448 7/30/2011
3.0.0.1 25,961 7/5/2011
3.0.0 43,778 6/25/2011
2.0.0 72,713 1/9/2011
1.3.0 257,218 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
* Removed support for end-of-life .NET Core versions (2.2 and 3.0). LTS versions are supported (2.1 and 3.1)
* 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 Icelandic 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.
* Additional ValidationException constructor that allows using both the default message and a custom one together.
* ScalePrecisionValidator algorithm now matches SQL Server.
* Additional overload of the When methods that contain the validation context.

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