/// <summary> /// Determines whether the specified account number is valid. The account number /// is given as a full number including the hypothetical check digit. /// validation steps: /// * bank code can have 3 digits max /// * account number can have 9 digits max (including the 2 check digits) /// * check digits are valid /// </summary> /// <param name="accountNumber">The account number including the hypothetical check digit.</param> /// <param name="validationErrors">Collection is filled up with the validation error messages</param> /// <returns> /// <c>true</c> if the specified account number is valid; otherwise, <c>false</c>. /// </returns> public bool Validate(NationalAccountNumber accountNumber, ICollection <ValidationError> validationErrors) { if (accountNumber == null) { throw new ArgumentNullException("accountNumber", "Please provide an account number."); } validationErrors = validationErrors ?? new List <ValidationError>(); var belgiumAccountNumber = new BelgiumAccountNumber(accountNumber); ValidationMethodsTools.ValidateMember(belgiumAccountNumber.AccountNumber, 9, validationErrors, ValidationErrorCodes.AccountNumberMissing, ValidationErrorCodes.AccountNumberTooLong); ValidationMethodsTools.ValidateMember(belgiumAccountNumber.BankCode, 3, validationErrors, ValidationErrorCodes.BankCodeMissing, ValidationErrorCodes.BankCodeTooLong); if (validationErrors.Count > 0) { return(false); } var accountNumberWithBankCode = String.Format("{0,3}{1,9}", belgiumAccountNumber.BankCode, belgiumAccountNumber.AccountNumber).Replace(' ', '0'); if (!validationMethod.IsValid(accountNumberWithBankCode)) { validationErrors.AddValidationErrorMessage("The validation of the check digits failed."); } return(validationErrors.Count == 0); }
/// <summary> /// Calculates the check digit. /// The account number is given without a check digit. /// </summary> /// <param name="accountNumber">The account number without a check digit.</param> /// <returns> /// The calculated check digit for the given account number /// </returns> public string CalculateCheckDigit(NationalAccountNumber accountNumber) { if (accountNumber == null) { throw new ArgumentNullException("accountNumber", "Please provide an account number."); } var belgiumAccountNumber = new BelgiumAccountNumber(accountNumber); if (String.IsNullOrEmpty(belgiumAccountNumber.AccountNumber)) { throw new ArgumentException("The account number is missing.", "accountNumber"); } if (String.IsNullOrEmpty(belgiumAccountNumber.BankCode)) { throw new ArgumentException("The bank code is missing.", "accountNumber"); } var accountNumberWithBankCode = String.Format("{0,3}{1,7}", belgiumAccountNumber.BankCode, belgiumAccountNumber.AccountNumber).Replace(' ', '0'); var digits = validationMethod.CalculateCheckDigit(accountNumberWithBankCode); return(digits.Length < 2 ? "0" + digits : digits); }