FluentValidation 11.9.2

Prefix Reserved
dotnet add package FluentValidation --version 11.9.2                
NuGet\Install-Package FluentValidation -Version 11.9.2                
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="11.9.2" />                
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add FluentValidation --version 11.9.2                
#r "nuget: FluentValidation, 11.9.2"                
#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=11.9.2

// Install FluentValidation as a Cake Tool
#tool nuget:?package=FluentValidation&version=11.9.2                

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 net5.0 is compatible.  net5.0-windows was computed.  net6.0 is compatible.  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 is compatible.  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 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. 
.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 is compatible. 
.NET Framework net461 was computed.  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.
  • .NETStandard 2.0

  • .NETStandard 2.1

    • No dependencies.
  • net5.0

    • No dependencies.
  • net6.0

    • No dependencies.
  • net7.0

    • No dependencies.
  • net8.0

    • No dependencies.

NuGet packages (2.1K)

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.

FluentValidation.WebAPI

ASP.NET WebApi integration for FluentValidation

GitHub repositories (200)

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.
dotnet-architecture/eShopOnWeb
Sample ASP.NET Core 8.0 reference application, powered by Microsoft, demonstrating a layered application architecture with monolithic deployment model. Download the eBook PDF from docs folder.
Version Downloads Last updated
11.9.2 1,647,491 6/10/2024
11.9.1 3,569,339 4/23/2024
11.9.0 14,407,785 12/21/2023
11.8.1 3,947,304 11/22/2023
11.8.0 5,145,647 10/19/2023
11.7.1 7,647,444 8/12/2023
11.7.0 96,100 8/11/2023
11.6.0 5,956,679 7/4/2023
11.5.2 13,554,091 4/7/2023
11.5.1 26,597,347 2/20/2023
11.5.0 1,815,203 2/13/2023
11.4.0 14,400,152 11/23/2022
11.3.0 2,700,871 11/10/2022
11.2.2 12,633,387 9/11/2022
11.2.1 18,243,815 8/28/2022
11.2.0 6,452,620 8/8/2022
11.1.1 519,336 8/6/2022
11.1.0 10,545,291 6/22/2022
11.0.3 2,813,389 6/10/2022
11.0.2 4,028,797 5/27/2022
11.0.1 5,524,806 5/7/2022
11.0.0 4,059,957 4/30/2022
10.4.0 16,302,568 3/11/2022
10.3.6 22,668,597 12/13/2021
10.3.5 2,818,664 11/30/2021
10.3.4 8,647,647 10/22/2021
10.3.3 10,346,646 8/24/2021
10.3.1 644,894 8/19/2021
10.3.0 7,264,622 7/9/2021
10.2.3 7,202,193 6/3/2021
10.2.2 413,057 6/1/2021
10.2.1 1,217,742 5/30/2021
10.2.0 321,110 5/28/2021
10.1.0 4,662,094 4/28/2021
10.0.4 3,786,652 4/17/2021
9.5.4 4,478,255 4/5/2021
9.5.3 3,691,863 3/15/2021
9.5.2 1,733,697 3/8/2021
9.5.1 6,142,942 2/11/2021
9.5.0 2,853,229 1/31/2021
9.4.0 2,788,188 1/14/2021
9.3.0 12,772,333 11/10/2020
9.3.0-preview3 36,090 10/19/2020
9.3.0-preview2 142,806 9/15/2020
9.3.0-preview1 12,775 8/26/2020
9.2.2 6,556,437 9/20/2020
9.2.1 25,594 9/19/2020
9.2.0 7,251,567 8/26/2020
9.1.3 976,258 8/19/2020
9.1.2 882,983 8/12/2020
9.1.1 633,058 8/8/2020
9.1.0 144,163 8/8/2020
9.0.1 4,960,348 7/14/2020
9.0.0-preview5 86,649 5/23/2020
9.0.0-preview4 136,875 4/22/2020
9.0.0-preview3 187,874 2/29/2020
9.0.0-preview2 31,481 2/21/2020
9.0.0-preview1 92,263 2/8/2020
8.6.3 5,770,356 8/28/2020
8.6.2 25,300,240 2/29/2020
8.6.1 11,576,627 12/28/2019
8.6.0 3,909,830 12/4/2019
8.5.1 3,563,792 11/2/2019
8.5.0 5,546,584 9/24/2019
8.5.0-preview5 65,972 9/1/2019
8.5.0-preview4 92,118 7/23/2019
8.5.0-preview3 30,895 7/10/2019
8.5.0-preview2 73,292 6/13/2019
8.5.0-preview1 57,054 5/10/2019
8.4.0 13,081,208 5/10/2019
8.3.0 3,714,543 4/24/2019
8.2.3 636,425 4/12/2019
8.2.2 952,664 4/5/2019
8.2.1 430,006 4/4/2019
8.2.0 1,007,048 3/26/2019
8.1.3 4,888,194 1/25/2019
8.1.2 2,213,610 12/18/2018
8.1.1 555,817 12/11/2018
8.1.0 615,971 12/6/2018
8.1.0-preview2 29,047 11/14/2018
8.1.0-preview1 27,485 10/14/2018
8.0.101 801,232 11/24/2018
8.0.100 3,705,247 9/4/2018
8.0.0 1,013,462 8/16/2018
8.0.0-rc1 51,937 7/24/2018
8.0.0-preview4 25,402 7/16/2018
8.0.0-preview3 23,945 7/13/2018
8.0.0-preview2 23,761 7/13/2018
7.6.105 1,475,328 8/11/2018
7.6.104 2,646,547 7/6/2018
7.6.103 1,223,724 6/16/2018
7.6.102 297,369 6/14/2018
7.6.101 74,603 6/13/2018
7.6.100 165,855 6/7/2018
7.6.0 375,374 6/1/2018
7.6.0-preview1 47,221 4/12/2018
7.5.2 3,620,224 3/16/2018
7.5.1 250,720 3/11/2018
7.5.0 720,559 2/26/2018
7.4.0 1,694,958 1/26/2018
7.3.4 1,011,773 1/2/2018
7.3.3 180,745 12/22/2017
7.3.2 69,961 12/21/2017
7.3.1 315,096 12/13/2017
7.3.0 87,746 12/13/2017
7.3.0-beta3 27,819 12/8/2017
7.3.0-beta2 44,896 11/20/2017
7.3.0-beta1 24,784 11/11/2017
7.2.1 2,661,253 10/24/2017
7.2.0 781,064 10/5/2017
7.2.0-beta3 41,122 9/5/2017
7.2.0-beta2 26,974 8/22/2017
7.2.0-beta1 23,246 8/19/2017
7.1.1 1,889,045 7/25/2017
7.1.0 532,893 6/28/2017
7.1.0-beta1 23,020 6/24/2017
7.0.3 725,036 6/7/2017
7.0.2 273,824 5/26/2017
7.0.1 78,996 5/23/2017
7.0.0 579,921 5/19/2017
7.0.0-beta3 27,538 5/1/2017
7.0.0-beta2 26,687 4/17/2017
7.0.0-beta1 24,254 4/7/2017
6.4.1 1,629,250 3/15/2017
6.4.1-beta1 23,384 3/13/2017
6.4.0 863,586 3/3/2017
6.4.0-rc4 145,930 2/13/2017
6.4.0-rc3 38,893 2/3/2017
6.4.0-rc2 39,353 1/30/2017
6.4.0-rc1 23,146 1/30/2017
6.4.0-beta9 90,222 11/21/2016
6.4.0-beta8 50,130 10/31/2016
6.4.0-beta7 23,764 10/28/2016
6.4.0-beta6 24,066 10/25/2016
6.4.0-beta5 23,701 10/24/2016
6.4.0-beta4 23,805 10/21/2016
6.4.0-beta3 70,422 7/4/2016
6.4.0-beta2 24,680 7/1/2016
6.4.0-beta10 22,901 1/30/2017
6.4.0-beta1 27,953 6/28/2016
6.3.4-alpha 396,919 6/1/2016
6.3.3-alpha 22,718 5/27/2016
6.2.1 4,772,182 2/26/2016
6.2.1-beta1 28,107 2/24/2016
6.2.0 156,180 2/22/2016
6.2.0-beta1 23,950 2/12/2016
6.1.0 395,106 1/18/2016
6.0.2 110,810 1/5/2016
6.0.1 38,520 1/5/2016
6.0.0 121,474 12/22/2015
5.6.2 1,394,001 5/29/2015
5.6.1 33,564 5/29/2015
5.5.0 1,105,470 10/31/2014
5.4.0 572,031 7/3/2014
5.3.0 100,902 5/27/2014
5.2.0 72,762 5/21/2014
5.1.0 924,363 3/11/2014
5.0.0.1 461,508 10/24/2013
4.0.0.1 276,518 7/18/2013
4.0.0 108,172 4/29/2013
3.4.6 382,118 8/30/2012
3.4.0 64,486 8/17/2012
3.3.1 80,415 3/30/2012
3.2.0 71,109 11/14/2011
3.1.0 52,141 7/30/2011
3.0.0.1 25,830 7/5/2011
3.0.0 41,573 6/25/2011
2.0.0 67,952 1/9/2011
1.3.0 194,716 1/7/2011

FluentValidation 11 is a major release. Please read the upgrade guide at https://docs.fluentvalidation.net/en/latest/upgrading-to-11.html

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