FluentValidation 11.2.2

.NET 5.0 .NET Standard 2.0
NuGet\Install-Package FluentValidation -Version 11.2.2
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.
dotnet add package FluentValidation --version 11.2.2
<PackageReference Include="FluentValidation" Version="11.2.2" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add FluentValidation --version 11.2.2
#r "nuget: FluentValidation, 11.2.2"
#r directive can be used in F# Interactive, C# scripting and .NET Interactive. 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=11.2.2

// Install FluentValidation as a Cake Tool
#tool nuget:?package=FluentValidation&version=11.2.2

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 Versions
.NET net5.0 net5.0-windows net6.0 net6.0-android net6.0-ios net6.0-maccatalyst net6.0-macos net6.0-tvos net6.0-windows
.NET Core netcoreapp2.0 netcoreapp2.1 netcoreapp2.2 netcoreapp3.0 netcoreapp3.1
.NET Standard netstandard2.0 netstandard2.1
.NET Framework net461 net462 net463 net47 net471 net472 net48
MonoAndroid monoandroid
MonoMac monomac
MonoTouch monotouch
Tizen tizen40 tizen60
Xamarin.iOS xamarinios
Xamarin.Mac xamarinmac
Xamarin.TVOS xamarintvos
Xamarin.WatchOS xamarinwatchos
Compatible target framework(s)
Additional computed target framework(s)
Learn more about Target Frameworks and .NET Standard.

NuGet packages (1.3K)

Showing the top 5 NuGet packages that depend on FluentValidation:

Package Downloads
FluentValidation.DependencyInjectionExtensions The ID prefix of this package has been reserved for one of the owners of this package by NuGet.org.

Dependency injection extensions for FluentValidation

FluentValidation.AspNetCore The ID prefix of this package has been reserved for one of the owners of this package by NuGet.org.

AspNetCore integration for FluentValidation

MicroElements.Swashbuckle.FluentValidation The ID prefix of this package has been reserved for one of the owners of this package by NuGet.org.

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

FluentValidation.WebAPI The ID prefix of this package has been reserved for one of the owners of this package by NuGet.org.

ASP.NET WebApi integration for FluentValidation

Ocelot

Ocelot is an API Gateway. The project is aimed at people using .NET running a micro services / service orientated architecture that need a unified point of entry into their system. In particular I want easy integration with IdentityServer reference and bearer tokens. reference tokens. Ocelot is a bunch of middlewares in a specific order. Ocelot manipulates the HttpRequest object into a state specified by its configuration until it reaches a request builder middleware where it creates a HttpRequestMessage object which is used to make a request to a downstream service. The middleware that makes the request is the last thing in the Ocelot pipeline. It does not call the next middleware. The response from the downstream service is stored in a per request scoped repository and retrived as the requests goes back up the Ocelot pipeline. There is a piece of middleware that maps the HttpResponseMessage onto the HttpResponse object and that is returned to the client. That is basically it with a bunch of other features.

GitHub repositories (147)

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

Repository Stars
aspnetboilerplate/aspnetboilerplate
ASP.NET Boilerplate - Web Application Framework
abpframework/abp
Open Source Web Application Framework for ASP.NET Core
dotnet-architecture/eShopOnWeb
Sample ASP.NET Core 6.0 reference application, powered by Microsoft, demonstrating a layered application architecture with monolithic deployment model. Download the eBook PDF from docs folder.
Sonarr/Sonarr
Smart PVR for newsgroup and bittorrent users.
kgrzybek/modular-monolith-with-ddd
Full Modular Monolith application with Domain-Driven Design approach.
Version Downloads Last updated
11.2.2 227,644 9/11/2022
11.2.1 400,136 8/28/2022
11.2.0 841,762 8/8/2022
11.1.1 55,551 8/6/2022
11.1.0 2,065,868 6/22/2022
11.0.3 621,310 6/10/2022
11.0.2 905,544 5/27/2022
11.0.1 1,351,437 5/7/2022
11.0.0 520,842 4/30/2022
10.4.0 4,563,463 3/11/2022
10.3.6 7,998,657 12/13/2021
10.3.5 1,227,398 11/30/2021
10.3.4 3,780,989 10/22/2021
10.3.3 5,351,367 8/24/2021
10.3.1 373,082 8/19/2021
10.3.0 3,911,285 7/9/2021
10.2.3 4,102,412 6/3/2021
10.2.2 258,953 6/1/2021
10.2.1 608,696 5/30/2021
10.2.0 150,639 5/28/2021
10.1.0 2,852,762 4/28/2021
10.0.4 1,727,654 4/17/2021
9.5.4 1,830,902 4/5/2021
9.5.3 2,434,746 3/15/2021
9.5.2 1,091,071 3/8/2021
9.5.1 3,657,602 2/11/2021
9.5.0 1,774,589 1/31/2021
9.4.0 1,876,091 1/14/2021
9.3.0 8,237,468 11/10/2020
9.3.0-preview3 25,662 10/19/2020
9.3.0-preview2 116,743 9/15/2020
9.3.0-preview1 8,995 8/26/2020
9.2.2 4,552,869 9/20/2020
9.2.1 14,606 9/19/2020
9.2.0 5,069,828 8/26/2020
9.1.3 748,650 8/19/2020
9.1.2 594,028 8/12/2020
9.1.1 462,267 8/8/2020
9.1.0 33,055 8/8/2020
9.0.1 2,933,280 7/14/2020
9.0.0-preview5 69,460 5/23/2020
9.0.0-preview4 98,236 4/22/2020
9.0.0-preview3 138,312 2/29/2020
9.0.0-preview2 27,215 2/21/2020
9.0.0-preview1 68,744 2/8/2020
8.6.3 2,646,161 8/28/2020
8.6.2 17,264,498 2/29/2020
8.6.1 8,287,850 12/28/2019
8.6.0 3,021,384 12/4/2019
8.5.1 2,778,728 11/2/2019
8.5.0 3,897,208 9/24/2019
8.5.0-preview5 55,536 9/1/2019
8.5.0-preview4 79,473 7/23/2019
8.5.0-preview3 26,856 7/10/2019
8.5.0-preview2 52,309 6/13/2019
8.5.0-preview1 47,842 5/10/2019
8.4.0 9,982,330 5/10/2019
8.3.0 2,469,761 4/24/2019
8.2.3 503,757 4/12/2019
8.2.2 721,539 4/5/2019
8.2.1 290,362 4/4/2019
8.2.0 773,735 3/26/2019
8.1.3 4,048,622 1/25/2019
8.1.2 1,788,674 12/18/2018
8.1.1 492,885 12/11/2018
8.1.0 411,523 12/6/2018
8.1.0-preview2 26,812 11/14/2018
8.1.0-preview1 25,641 10/14/2018
8.0.101 597,635 11/24/2018
8.0.100 3,022,144 9/4/2018
8.0.0 760,165 8/16/2018
8.0.0-rc1 45,346 7/24/2018
8.0.0-preview4 22,588 7/16/2018
8.0.0-preview3 21,284 7/13/2018
8.0.0-preview2 21,067 7/13/2018
7.6.105 1,019,843 8/11/2018
7.6.104 2,054,228 7/6/2018
7.6.103 973,632 6/16/2018
7.6.102 215,795 6/14/2018
7.6.101 66,327 6/13/2018
7.6.100 147,125 6/7/2018
7.6.0 305,771 6/1/2018
7.6.0-preview1 38,826 4/12/2018
7.5.2 2,698,422 3/16/2018
7.5.1 187,952 3/11/2018
7.5.0 643,250 2/26/2018
7.4.0 1,062,435 1/26/2018
7.3.4 863,807 1/2/2018
7.3.3 159,301 12/22/2017
7.3.2 54,367 12/21/2017
7.3.1 256,695 12/13/2017
7.3.0 43,214 12/13/2017
7.3.0-beta3 25,703 12/8/2017
7.3.0-beta2 40,161 11/20/2017
7.3.0-beta1 22,670 11/11/2017
7.2.1 2,056,662 10/24/2017
7.2.0 663,682 10/5/2017
7.2.0-beta3 38,748 9/5/2017
7.2.0-beta2 24,576 8/22/2017
7.2.0-beta1 21,122 8/19/2017
7.1.1 1,441,752 7/25/2017
7.1.0 422,478 6/28/2017
7.1.0-beta1 20,930 6/24/2017
7.0.3 642,383 6/7/2017
7.0.2 223,960 5/26/2017
7.0.1 61,447 5/23/2017
7.0.0 388,360 5/19/2017
7.0.0-beta3 25,076 5/1/2017
7.0.0-beta2 24,611 4/17/2017
7.0.0-beta1 22,119 4/7/2017
6.4.1 1,088,023 3/15/2017
6.4.1-beta1 21,854 3/13/2017
6.4.0 696,243 3/3/2017
6.4.0-rc4 143,475 2/13/2017
6.4.0-rc3 33,236 2/3/2017
6.4.0-rc2 37,188 1/30/2017
6.4.0-rc1 20,980 1/30/2017
6.4.0-beta9 85,513 11/21/2016
6.4.0-beta8 47,863 10/31/2016
6.4.0-beta7 21,540 10/28/2016
6.4.0-beta6 21,958 10/25/2016
6.4.0-beta5 21,644 10/24/2016
6.4.0-beta4 21,676 10/21/2016
6.4.0-beta3 66,643 7/4/2016
6.4.0-beta2 22,539 7/1/2016
6.4.0-beta10 20,832 1/30/2017
6.4.0-beta1 24,783 6/28/2016
6.3.4-alpha 332,448 6/1/2016
6.3.3-alpha 21,219 5/27/2016
6.2.1 3,239,705 2/26/2016
6.2.1-beta1 25,355 2/24/2016
6.2.0 116,254 2/22/2016
6.2.0-beta1 21,354 2/12/2016
6.1.0 318,477 1/18/2016
6.0.2 97,570 1/5/2016
6.0.1 34,371 1/5/2016
6.0.0 89,683 12/22/2015
5.6.2 1,065,543 5/29/2015
5.6.1 28,790 5/29/2015
5.5.0 845,795 10/31/2014
5.4.0 490,078 7/3/2014
5.3.0 87,536 5/27/2014
5.2.0 61,570 5/21/2014
5.1.0 599,807 3/11/2014
5.0.0.1 306,930 10/24/2013
4.0.0.1 217,035 7/18/2013
4.0.0 94,680 4/29/2013
3.4.6 296,484 8/30/2012
3.4.0 56,717 8/17/2012
3.3.1 53,183 3/30/2012
3.2.0 61,267 11/14/2011
3.1.0 49,090 7/30/2011
3.0.0.1 23,670 7/5/2011
3.0.0 32,525 6/25/2011
2.0.0 50,247 1/9/2011
1.3.0 89,024 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