FluentValidation 12.0.0-preview1

Prefix Reserved
.NET 8.0 This package targets .NET 8.0. The package is compatible with this framework or higher.
This is a prerelease version of FluentValidation. 
dotnet add package FluentValidation --version 12.0.0-preview1
                    


                    

                
NuGet\Install-Package FluentValidation -Version 12.0.0-preview1
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="12.0.0-preview1" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="FluentValidation" Version="12.0.0-preview1" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="FluentValidation" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add FluentValidation --version 12.0.0-preview1
                    


                    

                
#r "nuget: FluentValidation, 12.0.0-preview1"
#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. 
#addin nuget:?package=FluentValidation&version=12.0.0-preview1&prerelease
                    


                            Install FluentValidation as a Cake Addin
                        

                    

                
#tool nuget:?package=FluentValidation&version=12.0.0-preview1&prerelease
                    


                            Install FluentValidation as a Cake Tool

FluentValidation is validation library for .NET that uses a fluent interface and lambda expressions for building strongly-typed validation rules.

Supporting the project

If you use FluentValidation in a commercial project, please sponsor the project financially. FluentValidation is developed and supported by @JeremySkinner for free in his spare time and financial sponsorship helps keep the project going. You can sponsor the project via either GitHub sponsors or OpenCollective.

Example

With FluentValidation, you can define a class that inherits from AbstractValidator which contains the rules for a particular class. The example below shows how you could define rules for a Customer class, and then how to execute the validator.

using FluentValidation;

public class CustomerValidator: AbstractValidator<Customer> {
  public CustomerValidator() {
    RuleFor(x => x.Surname).NotEmpty();
    RuleFor(x => x.Forename).NotEmpty().WithMessage("Please specify a first name");
    RuleFor(x => x.Discount).NotEqual(0).When(x => x.HasDiscount);
    RuleFor(x => x.Address).Length(20, 250);
    RuleFor(x => x.Postcode).Must(BeAValidPostcode).WithMessage("Please specify a valid postcode");
  }

  private bool BeAValidPostcode(string postcode) {
    // custom postcode validating logic goes here
  }
}

var customer = new Customer();
var validator = new CustomerValidator();

// Execute the validator.
ValidationResult results = validator.Validate(customer);

// Inspect any validation failures.
bool success = results.IsValid;
List<ValidationFailure> failures = results.Errors;

Full Documentation

Full documentation can be found at https://docs.fluentvalidation.net

Release Notes and Change Log

Release notes can be found on GitHub.

Product Compatible and additional computed target framework versions.
.NET net8.0 is compatible.  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. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

  • net8.0

    • No dependencies.

NuGet packages (2.5K)

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 (218)

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 9
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.
dotnet-architecture/eShopOnWeb
Sample ASP.NET Core 8.0 reference application, now community supported: https://github.com/NimblePros/eShopOnWeb
MudBlazor/MudBlazor
Blazor Component Library based on Material Design principles with an emphasis on ease of use and extensibility
ThreeMammals/Ocelot
.NET API Gateway
NancyFx/Nancy
Lightweight, low-ceremony, framework for building HTTP based services on .Net and Mono
EduardoPires/EquinoxProject
Web Application ASP.NET 8 using Clean Architecture, DDD, CQRS, Event Sourcing and a lot of good practices
canton7/SyncTrayzor
Windows tray utility / filesystem watcher / launcher for Syncthing
FastEndpoints/FastEndpoints
A light-weight REST API development framework for ASP.NET 8 and newer.
jasontaylordev/NorthwindTraders
Northwind Traders is a sample application built using ASP.NET Core and Entity Framework Core.
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.
Lidarr/Lidarr
Looks and smells like Sonarr but made for music.
microsoft/RulesEngine
A Json based Rules Engine with extensive Dynamic expression support
fullstackhero/blazor-starter-kit
Clean Architecture Template for Blazor WebAssembly Built with MudBlazor Components.
Megabit/Blazorise
Blazorise is a component library built on top of Blazor with support for CSS frameworks like Bootstrap, Tailwind, Bulma, AntDesign, and Material.
Readarr/Readarr
Book Manager and Automation (Sonarr for Ebooks)
Version Downloads Last updated
12.0.0-preview1 77,227 3 months ago
11.11.0 14,296,275 5 months ago
11.10.0 12,290,553 7 months ago
11.9.2 18,797,661 10 months ago
11.9.1 10,025,073 4/23/2024
11.9.0 26,224,046 12/21/2023
11.8.1 7,302,026 11/22/2023
11.8.0 8,004,962 10/19/2023
11.7.1 10,242,172 8/12/2023
11.7.0 116,162 8/11/2023
11.6.0 7,780,477 7/4/2023
11.5.2 17,373,866 4/7/2023
11.5.1 48,935,581 2/20/2023
11.5.0 2,493,667 2/13/2023
11.4.0 17,731,571 11/23/2022
11.3.0 3,333,134 11/10/2022
11.2.2 15,222,457 9/11/2022
11.2.1 21,615,214 8/28/2022
11.2.0 7,327,955 8/8/2022
11.1.1 617,702 8/6/2022
11.1.0 12,399,688 6/22/2022
11.0.3 3,327,068 6/10/2022
11.0.2 4,941,672 5/27/2022
11.0.1 6,360,576 5/7/2022
11.0.0 5,607,787 4/30/2022
10.4.0 19,187,475 3/11/2022
10.3.6 25,755,979 12/13/2021
10.3.5 3,098,905 11/30/2021
10.3.4 9,782,207 10/22/2021
10.3.3 11,414,586 8/24/2021
10.3.1 705,334 8/19/2021
10.3.0 8,062,448 7/9/2021
10.2.3 8,055,344 6/3/2021
10.2.2 444,673 6/1/2021
10.2.1 1,327,408 5/30/2021
10.2.0 368,598 5/28/2021
10.1.0 5,192,108 4/28/2021
10.0.4 4,103,765 4/17/2021
9.5.4 5,938,632 4/5/2021
9.5.3 3,945,075 3/15/2021
9.5.2 1,921,141 3/8/2021
9.5.1 6,585,386 2/11/2021
9.5.0 3,225,551 1/31/2021
9.4.0 3,005,007 1/14/2021
9.3.0 14,324,368 11/10/2020
9.3.0-preview3 38,765 10/19/2020
9.3.0-preview2 149,632 9/15/2020
9.3.0-preview1 13,275 8/26/2020
9.2.2 7,000,398 9/20/2020
9.2.1 29,755 9/19/2020
9.2.0 7,699,772 8/26/2020
9.1.3 1,013,883 8/19/2020
9.1.2 937,895 8/12/2020
9.1.1 661,734 8/8/2020
9.1.0 225,053 8/8/2020
9.0.1 5,310,618 7/14/2020
9.0.0-preview5 89,277 5/23/2020
9.0.0-preview4 141,072 4/22/2020
9.0.0-preview3 199,684 2/29/2020
9.0.0-preview2 32,274 2/21/2020
9.0.0-preview1 98,443 2/8/2020
8.6.3 7,010,492 8/28/2020
8.6.2 27,615,485 2/29/2020
8.6.1 12,527,228 12/28/2019
8.6.0 4,185,616 12/4/2019
8.5.1 3,771,069 11/2/2019
8.5.0 6,180,470 9/24/2019
8.5.0-preview5 69,074 9/1/2019
8.5.0-preview4 97,990 7/23/2019
8.5.0-preview3 31,697 7/10/2019
8.5.0-preview2 82,789 6/13/2019
8.5.0-preview1 60,799 5/10/2019
8.4.0 14,086,455 5/10/2019
8.3.0 3,967,050 4/24/2019
8.2.3 686,553 4/12/2019
8.2.2 1,044,986 4/5/2019
8.2.1 476,785 4/4/2019
8.2.0 1,061,882 3/26/2019
8.1.3 5,091,310 1/25/2019
8.1.2 2,330,783 12/18/2018
8.1.1 591,923 12/11/2018
8.1.0 729,539 12/6/2018
8.1.0-preview2 29,273 11/14/2018
8.1.0-preview1 27,727 10/14/2018
8.0.101 893,051 11/24/2018
8.0.100 3,937,559 9/4/2018
8.0.0 1,093,964 8/16/2018
8.0.0-rc1 53,550 7/24/2018
8.0.0-preview4 25,719 7/16/2018
8.0.0-preview3 24,251 7/13/2018
8.0.0-preview2 24,038 7/13/2018
7.6.105 1,689,578 8/11/2018
7.6.104 2,751,379 7/6/2018
7.6.103 1,285,131 6/16/2018
7.6.102 331,143 6/14/2018
7.6.101 76,513 6/13/2018
7.6.100 175,168 6/7/2018
7.6.0 396,937 6/1/2018
7.6.0-preview1 50,407 4/12/2018
7.5.2 3,845,102 3/16/2018
7.5.1 269,399 3/11/2018
7.5.0 744,853 2/26/2018
7.4.0 2,082,972 1/26/2018
7.3.4 1,076,556 1/2/2018
7.3.3 190,453 12/22/2017
7.3.2 73,628 12/21/2017
7.3.1 336,266 12/13/2017
7.3.0 113,962 12/13/2017
7.3.0-beta3 28,141 12/8/2017
7.3.0-beta2 46,388 11/20/2017
7.3.0-beta1 25,062 11/11/2017
7.2.1 2,830,388 10/24/2017
7.2.0 818,987 10/5/2017
7.2.0-beta3 41,462 9/5/2017
7.2.0-beta2 27,250 8/22/2017
7.2.0-beta1 23,506 8/19/2017
7.1.1 2,133,219 7/25/2017
7.1.0 550,629 6/28/2017
7.1.0-beta1 23,257 6/24/2017
7.0.3 749,627 6/7/2017
7.0.2 283,580 5/26/2017
7.0.1 88,000 5/23/2017
7.0.0 700,315 5/19/2017
7.0.0-beta3 27,894 5/1/2017
7.0.0-beta2 26,939 4/17/2017
7.0.0-beta1 24,504 4/7/2017
6.4.1 1,896,922 3/15/2017
6.4.1-beta1 23,620 3/13/2017
6.4.0 958,229 3/3/2017
6.4.0-rc4 146,210 2/13/2017
6.4.0-rc3 39,322 2/3/2017
6.4.0-rc2 39,600 1/30/2017
6.4.0-rc1 23,397 1/30/2017
6.4.0-beta9 90,924 11/21/2016
6.4.0-beta8 50,409 10/31/2016
6.4.0-beta7 24,025 10/28/2016
6.4.0-beta6 24,357 10/25/2016
6.4.0-beta5 23,935 10/24/2016
6.4.0-beta4 24,046 10/21/2016
6.4.0-beta3 70,995 7/4/2016
6.4.0-beta2 24,920 7/1/2016
6.4.0-beta10 23,127 1/30/2017
6.4.0-beta1 28,228 6/28/2016
6.3.4-alpha 414,678 6/1/2016
6.3.3-alpha 22,946 5/27/2016
6.2.1 5,186,988 2/26/2016
6.2.1-beta1 28,366 2/24/2016
6.2.0 166,330 2/22/2016
6.2.0-beta1 24,218 2/12/2016
6.1.0 415,180 1/18/2016
6.0.2 115,052 1/5/2016
6.0.1 39,288 1/5/2016
6.0.0 129,634 12/22/2015
5.6.2 1,533,565 5/29/2015
5.6.1 34,223 5/29/2015
5.5.0 1,184,461 10/31/2014
5.4.0 599,446 7/3/2014
5.3.0 103,931 5/27/2014
5.2.0 75,445 5/21/2014
5.1.0 1,010,360 3/11/2014
5.0.0.1 518,271 10/24/2013
4.0.0.1 294,600 7/18/2013
4.0.0 116,565 4/29/2013
3.4.6 406,306 8/30/2012
3.4.0 68,871 8/17/2012
3.3.1 88,075 3/30/2012
3.2.0 74,347 11/14/2011
3.1.0 52,699 7/30/2011
3.0.0.1 26,134 7/5/2011
3.0.0 45,392 6/25/2011
2.0.0 74,385 1/9/2011
1.3.0 307,242 1/7/2011

FluentValidation 12 is a major release. Please read the upgrade guide at https://docs.fluentvalidation.net/en/latest/upgrading-to-12.html

Full release notes can be found at https://github.com/FluentValidation/FluentValidation/releases