//.net 中数据验证，一个开源的项目，直接下载
 1 using FluentValidation; 2  3 public class CustomerValidator: AbstractValidator<Customer> { 4   public CustomerValidator() { 5     RuleFor(customer => customer.Surname).NotEmpty(); 6     RuleFor(customer => customer.Forename).NotEmpty().WithMessage("Please specify a first name"); 7     RuleFor(customer => customer.Discount).NotEqual(0).When(customer => customer.HasDiscount); 8     RuleFor(customer => customer.Address).Length(20, 250); 9     RuleFor(customer => customer.Postcode).Must(BeAValidPostcode).WithMessage("Please specify a valid postcode");10   }11 12   private bool BeAValidPostcode(string postcode) {13     // custom postcode validating logic goes here14   }15 }16 17 Customer customer = new Customer();18 CustomerValidator validator = new CustomerValidator();19 ValidationResult results = validator.Validate(customer);20 21 bool validationSucceeded = results.IsValid;22 IList<ValidationFailure> failures = results.Errors;