FluentValidation 9.0.0-preview1

FluentValidation 8 is a major release. Please read the upgrade notes at https://fluentvalidation.net/upgrading-to-8

Changes in 8.6.0:

• Add support for ASP.NET Core 3.1
• Fixed issue with property indexers being incorrectly stripped out when using test extensions.
• AddToModelState no longer includes a dot if PropertyName is null

Changes in 8.5.1:

• Ensure lazily loaded calls to WithMessage can be used for client-side validation, provided they don't attempt to access model properties from inside the delegate (eg when using IStringLocalizer).
• Fix issue where OnFailure didn't work properly when invoked on validators with conditions.

Changes in 8.5.0:

• Add additional overload of the EmailAddress validator for compatibility with ASP.NET Core's default email validation.
• Simplify the advanced testhelper syntax.
• Add support for ASP.NET Core 3.
• Add support for defining child rules inline.
• ValidatorDescriptor now has consistent handling of model-level rules.
• RuleForEach can now access collection index in error message with placeholder.
• Welsh language translations of default error messages.
• Hungrian language translations of default error messages.
• Indonesian language translations of default error messages.
• Using RuleForEach combined with When is now more intuitive.
• Fixed order of rule execution when using async validation.

Changes in 8.4.0:

• Added simplified version of several messages across all translations to aid with ASP.NET Clientside validation.
• New enum validator for string properties.

Changes in 8.3.0:

• Fix issue in ASP.NET Core integration with GetServiceProvider not working correctly when invoked against a CustomContext/MessageBuilderContext.
• Improved how LanguageStringSource works with error-code overrides.
• Fix thread-safety issue with use of PropertyValidatorOptions.Empty (now removed).
• Improved how calls to When/Unless are handled internally.
• DelegatingValidator is now marked as deprecated.
• Improvements to Croatian language translations.
• Improvements to Georgian language translations.
• Resolved subtle bug where top-level WhenAsync wouldn't work correctly when wrapping a top-level call to When.

Changes in 8.2.3:

• Fix issue in WebApi integration where DataAnnotations validators could generate duplicate messages when in the same project as FluentValidation.

Changes in 8.2.2:

• Fix FluentValidation.DependencyInjection package name.

Changes in 8.2.1:

• Resolved issue using InjectValidator with RuleForEach.
• Add support for a default IValidatorInterceptor to be registered with the ASP.NET Core Service Provider.

Changes in 8.2.0:

• Add extensions for injecting child validators using the ASP.NET Core Service Provider.
• Implement RuleFor(...).ForEach(...) as an alternative to RuleForEach.
• WithLocalizedMessage is deprecated. Use the overload of WithMessage that takes a Func instead.

Changes in 8.1.3:

• Resolved issue where clientside validation was incorrectly generating metadata for rules with shared conditions.
• ScalePrecisionValidator now has a public method in the fluent interface.
• Fix placeholder names in ScalePrecisionValidator for consistency.
• Updates to Portuguese (Brazil) translations.

Changes in 8.1.2:

• Fix issue where shared When/Unless conditions didn't execute correctly when used with RuleForEach.

Changes in 8.1.1:

• Added RuleSetsExecuted property on ValidationResult.
• Resolved issue introduced in 8.1 where the shared condition cache does not work correctly with RuleForEach (#970).

Changes in 8.1:

• Add format support in message placeholders.
• Added support for overriding indexers for collection rules.
• Allow error codes to be used to override localization key in the Language Manager.
• Additional error details are now shown in the ShouldNotHaveValidationErrorFor test extension.
• Conditions defined with root-level When/WhenAsync/Unless/UnlessAsync are now only executed once (instead of once for each rule).
• Support Otherwise method chained from root-level When/WhenAsync/Unless/UnlessAsync.
• Minor wording changes to default English error messages.
• Japanese translation of the default error messages.
• Added Skip property to MVC5's CustomizeValidatorAttribute for parity with AspNetCore and WebApi.
• Remove type constraint on the OverridePropertyName overload that takes an expression.

Added Skip property to MVC5's CustomizeValidatorAttribute to bring parity with AspNetCore and WebApi integration. Changes in 8.0:

• Support validating only specific properties by path.
• Added OnFailure method
• Deprecated RuleFor(..).SetCollectionValidator in favour of RuleForEach(...).SetValidator
• IStringSource.GetString now takes a validation context instead of a model instance.
• Introduce PropertyValidatorOptions in order to clean up the IPropretyValidator interface.
• Moved the legacy ValidatorAttribute and AttributedValidatorFactory into a separate FluentValidation.Attributes package.
• Remove the pre-7.0 localization mechanism
• Remove the pre-7.0 methods for custom validation
• Removed many other deprecated methods

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