ByteDev/ByteDev.Validation.Fluent

Extensions and functionality to use with the FluentValidation library.

ByteDev.Validation.Fluent

Extensions and functionality to use with the FluentValidation library.

Installation

ByteDev.Validation.Fluent has been written as a .NET Standard 2.0 library, so you can consume it from a .NET Core or .NET Framework 4.6.1 (or greater) application.

ByteDev.Validation.Fluent is hosted as a package on nuget.org. To install from the Package Manager Console in Visual Studio run:

Install-Package ByteDev.Validation.Fluent

Further details can be found on the nuget page.

Release Notes

Releases follow semantic versioning.

Full details of the release notes can be viewed on GitHub.

Usage

Method extensions

IRuleBuilder<T, string>:

• IsDateTime
• IsDateTimeOrEmpty
• IsDigits
• IsDigitsOrEmpty
• IsEmailAddress
• IsEmailAddressOrEmpty
• IsIn
• IsGuid
• IsGuidOrEmpty
• IsUrl
• IsUrlOrEmpty

using FluentValidation;

// Request DTO

public class DummyRequest
{
    public string Guid { get; set; }

    public string GuidWithOverriddenMessage { get; set; }
}

// FluentValidation Validator for the request DTO

public class DummyRequestValidator : AbstractValidator<DummyRequest>
{
    public DummyRequestValidator()
    {
        RuleFor(r => r.Guid)
            .IsGuid();

        RuleFor(r => r.GuidWithOverriddenMessage)
            .IsGuid()
            .WithMessage("This is a overridden message");
    }
}

---

ValidationError

The package also provides a type ValidationError and extension method WithValidationError to help when creating specific validation errors.

These can be useful for example in the case of an API where the client sends a request that fails validation. A ValidationError can be created that encapsulates the error Code, Message and PropertyName that caused the error and this can then be reported back to the caller.

// Define some ValidationErrors

public static class ApiValidationErrors
{
    public static ValidationError GuidIsNotValid(string propertyName) => new ValidationError("1001", "Must be a valid GUID.", propertyName);

    // ... add more
}

// Use the ValidationError from within the Validator

public class ValidationErrorTestValidator : AbstractValidator<DummyRequest>
{
    public ValidationErrorTestValidator()
    {
        RuleFor(r => r.Guid)
            .IsGuid()
            .WithValidationError(ApiValidationErrors.GuidIsNotValid(nameof(DummyRequest.Guid)));
    }
}