How to use FluentValidation in C # application
I am creating an application that has the following layers
Data structure context - Entity Framework Entity Framework Objects POCO Service - WebApi is called to load / save WebApi object -
Now I believe I should put my business logic in the service layer since I have a service for objects, for example I have a Family object and a Family Service.
To create a validation object using FluentValidation it seems like you have to inherit from AbstractValidator, since my services are already inheriting from the object, is this not possible (or is it)?
I guess my only option is to create a FamilyValidator at the service level and call that validator from the service?
Is fluentValidation my best option or am I confusing something here?
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If you have an object called Customer, this is how you write a validator for it:
public class CustomerValidator: AbstractValidator<Customer> {
public CustomerValidator() {
RuleFor(customer => customer.Surname).NotEmpty();
RuleFor(customer => customer.Forename).NotEmpty().WithMessage("Please specify a first name");
RuleFor(customer => customer.Discount).NotEqual(0).When(customer => customer.HasDiscount);
RuleFor(customer => customer.Address).Length(20, 250);
RuleFor(customer => customer.Postcode).Must(BeAValidPostcode).WithMessage("Please specify a valid postcode");
}
private bool BeAValidPostcode(string postcode) {
// custom postcode validating logic goes here
}
}
Customer customer = new Customer();
CustomerValidator validator = new CustomerValidator();
ValidationResult results = validator.Validate(customer);
bool validationSucceeded = results.IsValid;
IList<ValidationFailure> failures = results.Errors;
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