FluentValidation 9.2.2

A validation library for .NET that uses a fluent interface to construct strongly-typed validation rules.

No packages depend on FluentValidation.

FluentValidation 9 is a major release. Please read the upgrade notes at https://docs.fluentvalidation.net/en/latest/upgrading-to-9.html

Changes in 9.2.2:

  • Fix one of the inheritance validator overloads not working correctly.

Changes in 9.2.1:

  • Add non-generic Add method to inheritance validator.
  • Updates to Persian translations.
  • Added Bengali translations.

Changes in 9.2.0:

  • Add inheritance validator
  • Performance improvements

Changes in 9.1.3:

  • Fix an issue with IncludeRulesNotInRuleSet not working correctly

Changes in 9.1.2:

  • Make the ValidationContext.ThrowOnFailures getter public.

Changes in 9.1.1:

  • Fix an incorrect deprecation message.

Changes in 9.1:

  • Make ruleset separator character splitting consistent
  • Transform now works with RuleForEach
  • Introduce constants for rulesets
  • Resolve issue when attempting to use asynchronous conditions in a synchornous validaiton run
  • Added asynchronous versions of the TestHelper methods.
  • Introduce CascadeMode.Stop and deprecate CascadeMode.StopOnFirstFailure to resolve confusion/abiguity about setting the cascade mode at validator-level (#1437)
  • RaiseValidationException can be overridden to customize the exception throwing process
  • Add new Validate extension methods that allow options to be configured using a strategy

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.
  • 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.
  • Automatically scanned types can be excluded when calling RegisterValidatorsFromAssemblyContaining in ASP.NET Core projects.
  • New AutomaticValidationEnabled property for use in ASP.NET Core projects (defaults to true).

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

.NET Framework 4.6.1

  • No dependencies.

.NET Standard 2.0

  • No dependencies.

Version Downloads Last updated
12.1.1 1 02/27/2026
12.1.0 1 02/27/2026
12.0.0 1 02/27/2026
12.0.0-preview1 1 02/27/2026
11.12.0 1 02/27/2026
11.11.0 2 02/25/2026
11.10.0 1 02/27/2026
11.9.2 1 02/27/2026
11.9.1 1 02/27/2026
11.9.0 1 02/27/2026
11.8.1 1 02/27/2026
11.8.0 1 02/27/2026
11.7.1 1 02/27/2026
11.7.0 1 02/27/2026
11.6.0 1 02/27/2026
11.5.2 1 02/27/2026
11.5.1 1 02/27/2026
11.5.0 1 02/27/2026
11.4.0 1 02/27/2026
11.3.0 1 02/27/2026
11.2.2 1 02/27/2026
11.2.1 1 02/27/2026
11.2.0 1 02/27/2026
11.1.1 1 02/27/2026
11.1.0 1 02/27/2026
11.0.3 1 02/27/2026
11.0.2 1 02/27/2026
11.0.1 1 02/27/2026
11.0.0 1 02/27/2026
10.4.0 1 02/27/2026
10.3.6 1 02/27/2026
10.3.5 1 02/27/2026
10.3.4 1 02/27/2026
10.3.3 1 02/27/2026
10.3.1 1 02/27/2026
10.3.0 1 02/27/2026
10.2.3 1 02/27/2026
10.2.2 1 02/27/2026
10.2.1 1 02/27/2026
10.2.0 1 02/27/2026
10.1.0 1 02/27/2026
10.0.4 1 02/27/2026
9.5.4 1 02/27/2026
9.5.3 1 02/27/2026
9.5.2 1 02/27/2026
9.5.1 1 02/27/2026
9.5.0 1 02/27/2026
9.4.0 1 02/27/2026
9.3.0 1 02/27/2026
9.3.0-preview3 1 02/27/2026
9.3.0-preview2 1 02/27/2026
9.3.0-preview1 1 02/27/2026
9.2.2 1 02/27/2026
9.2.1 1 02/27/2026
9.2.0 1 02/27/2026
9.1.3 1 02/27/2026
9.1.2 1 02/27/2026
9.1.1 1 02/27/2026
9.1.0 1 02/27/2026
9.0.1 1 02/27/2026
9.0.0-preview5 1 02/27/2026
9.0.0-preview4 1 02/27/2026
9.0.0-preview3 1 02/27/2026
9.0.0-preview2 1 02/27/2026
9.0.0-preview1 1 02/27/2026
8.6.3 1 02/27/2026
8.6.2 1 02/27/2026
8.6.1 1 02/27/2026
8.6.0 1 02/27/2026
8.5.1 1 02/27/2026
8.5.0 1 02/27/2026
8.5.0-preview5 1 02/27/2026
8.5.0-preview4 1 02/27/2026
8.5.0-preview3 1 02/27/2026
8.5.0-preview2 1 02/27/2026
8.5.0-preview1 1 02/27/2026
8.4.0 1 02/27/2026
8.3.0 1 02/27/2026
8.2.3 1 02/27/2026
8.2.2 1 02/27/2026
8.2.1 1 02/27/2026
8.2.0 1 02/27/2026
8.1.3 1 02/27/2026
8.1.2 1 02/27/2026
8.1.1 1 02/27/2026
8.1.0 1 02/27/2026
8.1.0-preview2 1 02/27/2026
8.1.0-preview1 1 02/27/2026
8.0.101 1 02/27/2026
8.0.100 1 02/27/2026
8.0.0 1 02/27/2026
8.0.0-rc1 1 02/27/2026
8.0.0-preview4 1 02/27/2026
8.0.0-preview3 1 02/27/2026
8.0.0-preview2 1 02/27/2026
7.6.105 1 02/27/2026
7.6.104 1 02/27/2026
7.6.103 1 02/27/2026
7.6.102 1 02/27/2026
7.6.101 1 02/27/2026
7.6.100 1 02/27/2026
7.6.0 1 02/27/2026
7.6.0-preview1 1 02/27/2026
7.5.2 1 02/27/2026
7.5.1 1 02/27/2026
7.5.0 1 02/27/2026
7.4.0 1 02/27/2026
7.3.4 1 02/27/2026
7.3.3 1 02/27/2026
7.3.2 1 02/27/2026
7.3.1 1 02/27/2026
7.3.0 1 02/27/2026
7.3.0-beta3 1 02/27/2026
7.3.0-beta2 1 02/27/2026
7.3.0-beta1 1 02/27/2026
7.2.1 1 02/27/2026
7.2.0 1 02/27/2026
7.2.0-beta3 1 02/27/2026
7.2.0-beta2 1 02/27/2026
7.2.0-beta1 1 02/27/2026
7.1.1 1 02/27/2026
7.1.0 1 02/27/2026
7.1.0-beta1 1 02/27/2026
7.0.3 1 02/27/2026
7.0.2 1 02/27/2026
7.0.1 1 02/27/2026
7.0.0 1 02/27/2026
7.0.0-beta3 1 02/27/2026
7.0.0-beta2 1 02/27/2026
7.0.0-beta1 1 02/27/2026
6.4.1 1 02/27/2026
6.4.1-beta1 1 02/27/2026
6.4.0 1 02/27/2026
6.4.0-rc4 1 02/27/2026
6.4.0-rc3 1 02/27/2026
6.4.0-rc2 1 02/27/2026
6.4.0-rc1 1 02/27/2026
6.4.0-beta9 1 02/27/2026
6.4.0-beta8 1 02/27/2026
6.4.0-beta7 1 02/27/2026
6.4.0-beta6 1 02/27/2026
6.4.0-beta5 1 02/27/2026
6.4.0-beta4 1 02/27/2026
6.4.0-beta3 1 02/27/2026
6.4.0-beta2 1 02/27/2026
6.4.0-beta10 1 02/27/2026
6.4.0-beta1 1 02/27/2026
6.3.4-alpha 1 02/27/2026
6.3.3-alpha 1 02/27/2026
6.2.1 1 02/27/2026
6.2.1-beta1 1 02/27/2026
6.2.0 1 02/27/2026
6.2.0-beta1 1 02/27/2026
6.1.0 1 02/27/2026
6.0.2 1 02/27/2026
6.0.1 1 02/27/2026
6.0.0 1 02/27/2026
5.6.2 1 02/27/2026
5.6.1 1 02/27/2026
5.5.0 1 02/27/2026
5.4.0 1 02/27/2026
5.3.0 1 02/27/2026
5.2.0 1 02/27/2026
5.1.0 1 02/27/2026
5.0.0.1 1 02/27/2026
4.0.0.1 1 02/27/2026
4.0.0 1 02/27/2026
3.4.6 1 02/27/2026
3.4.0 1 02/27/2026
3.3.1 1 02/27/2026
3.2.0 1 02/27/2026
3.1.0 1 02/27/2026
3.0.0.1 1 02/27/2026
3.0.0 1 02/27/2026
2.0.0 1 02/27/2026
1.3.0 1 02/27/2026