Bagaimana untuk mengesahkan tarikh lahir menggunakan pengesahan fasih dalam C# jika tarikh lahir melebihi tahun semasa?

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; } }

Invalid Date Of Birth