/// <summary>
/// Validates the account number as a Type 1 account. Will try to fix any errors in the account number. If not being able to
/// fix an incomplete account number an exception will be thrown.
/// </summary>
/// <param name="clearingNumber">The clearing number should be 4 digits.</param>
/// <param name="accountNumber">The account number should be max 7 digits. Will be leftpadded with zeroes if shorter.</param>
private static void ValidateType1(string clearingNumber, ref string accountNumber)
{
// Def. Type 1 Account (BGC: Type 1, Remark 1)
// (1) The clearing number should be 4 digits.
// (2) The account number should be 7 digits (if less than 7 characters, leftpad with zeroes).
// (3) Checksum calculation is made on the clearing number with the exception of the first digit, and seven digits of the actual account number.
// Clearing number should be 4 digits
if (clearingNumber.Length != 4)
{
throw new ArgumentException(
string.Format("clearingNumber is {0} characters long. Expected 4 characters.",
clearingNumber.Length));
}
// Account numbers with less than 7 digits should be leftpadded with zeroes.
accountNumber = accountNumber.PadLeft(7, '0');
// Acount number should be 7 digits
if (accountNumber.Length != 7)
{
throw new ArgumentException(
string.Format("accountNumber is {0} characters long. Expected 7 characters.",
accountNumber.Length));
}
// Checksum calculation is made on the clearing number with the exception of the first digit,
// and seven digits of the actual account number.
string checkValue = string.Concat(clearingNumber.Substring(1, 3), accountNumber);
if (!ModulusCheck.Mod11(checkValue))
{
throw new ArgumentException(string.Format("accountNumber has an invalid checksum (Type 1)."));
}
}
/// <summary>
/// Validates the account number as a Type 4 account. Will try to fix any errors in the account number. If not being able to
/// fix an incomplete account number an exception will be thrown.
/// </summary>
/// <param name="clearingNumber">The clearing number shoukld be 4 digits.</param>
/// <param name="accountNumber">The account number should be max 9 characters. Will be leftpadded with zeroes if shorter.</param>
private static void ValidateType4(string clearingNumber, ref string accountNumber)
{
// Def. Type 4 Account (BGC: Type 2, Remark 2)
// (1) The clearing number should be 4 digits, and is not a part of the account number.
// (2) The account number should be 9 digits (if less than 9 characters, leftpaded with zeroes).
// (3) Checksum calculations is made on the last 9 digits in the account number (modulus 11 check).
// Clearing number should be 4 digits
if (clearingNumber.Length != 4)
{
throw new ArgumentException(
string.Format("clearingNumber is {0} characters long. Expected 4 characters.",
clearingNumber.Length));
}
// Account numbers with less than 9 digits should be leftpadded with zeroes.
accountNumber = accountNumber.PadLeft(9, '0');
if (accountNumber.Length != 9)
{
throw new ArgumentException(
string.Format("accountNumber is {0} characters long. Expected 9 characters.",
accountNumber.Length));
}
if (!ModulusCheck.Mod11(accountNumber))
{
throw new ArgumentException(string.Format("accountNumber has an invalid checksum (Type 4)."));
}
}
