Fluent Validation for. NET

//.net data Validation, an open source project, direct download
1 usingfluentvalidation;2 3  Public classCustomervalidator:abstractvalidator<customer> {4    PublicCustomervalidator () {5Rulefor (Customer =customer. Surname). Notempty ();6Rulefor (customer = customer. forename). Notempty (). Withmessage ("Please specify a first name");7Rulefor (customer = customer. Discount). NotEqual (0). When (customer =customer. Hasdiscount);8Rulefor (customer = customer. Address). Length ( -, -);9Rulefor (customer = customer. Postcode). Must (Beavalidpostcode). Withmessage ("Please specify a valid postcode");Ten   } One  A   Private BOOLBeavalidpostcode (stringpostcode) { -     //Custom postcode validating logic goes here -   } the } -  -Customer customer =NewCustomer (); -Customervalidator Validator =Newcustomervalidator (); +Validationresult results =Validator. Validate (customer); -  + BOOLvalidationsucceeded =results. IsValid; Ailist<validationfailure> failures = results. Errors;

Fluent Validation for. NET