FluentValidation .NET 验证组件

FluentValidation是一个使用Linq表达式，非常流畅的小型业务对象验证组件。流畅也可以说优雅。类似链式操作。易于理解，功能完善。

还可以配合MVC使用直接在页面进行验证，当你看到它的语法时，非常优雅，非常令人心动。

而且它对ASP.NETCore支持十分友好，可以很方便的进行集成使用。

看如下官网提供的一段验证代码：

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
  }
}
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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