要为特定属性指定验证规则，请调用RuleFor方法，传递一个表示要验证的属性的lambda表达式

RuleFor(p => p.DateOfBirth)

要运行验证器，请实例化验证器对象并调用Validate方法，将要验证的对象传递给它。

ValidationResult results = validator.Validate(person);

Validate方法返回一个ValidationResult对象。它包含两个属性

IsValid - 一个布尔值，表示验证是否成功。

Errors - 包含有关任何验证失败的详细信息的ValidationFailure对象集合

示例1

static void Main(string[] args) {
   List errors = new List();

   PersonModel person = new PersonModel();
   person.FirstName = "TestUser";
   person.LastName = "TestUser";
   person.AccountBalance = 100;
   person.DateOfBirth = DateTime.Now.Date.AddYears(1);

   PersonValidator validator = new PersonValidator();

   ValidationResult results = validator.Validate(person);

   if (results.IsValid == false) {
      foreach (ValidationFailure failure in results.Errors){
         errors.Add(failure.ErrorMessage);
      }
   }

   foreach (var item in errors){
      Console.WriteLine(item);
   }
   Console.ReadLine();

   }
}

public class PersonModel {
   public string FirstName { get; set; }
   public string LastName { get; set; }
   public decimal AccountBalance { get; set; }
   public DateTime DateOfBirth { get; set; }
}

public class PersonValidator : AbstractValidator{
   public PersonValidator(){
      RuleFor(p => p.DateOfBirth)
      .Must(BeAValidAge).WithMessage("Invalid {PropertyName}");
   }

   protected bool BeAValidAge(DateTime date){
      int currentYear = DateTime.Now.Year;
      int dobYear = date.Year;

      if (dobYear <= currentYear && dobYear > (currentYear - 120)){
         return true;
      }

      return false;
   }
}

输出

Invalid Date Of Birth