Fluent Validation For .NET

//.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 here
14   }
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;