} // ParseIssueIdentifier()
/// <summary>
/// This function parses the enumerated issuer type from the string
/// credit card number.
/// </summary>
/// <param name="strAccountNumber">
/// The input fully-qualified credit card number.
/// </param>
/// <returns>
/// The substring representation of the issuer identifier.
/// </returns>
internal static IssuerType ParsIssuerType(string strAccountNumber)
{
IssuerType eit = IssuerType.Unknown;
foreach (CCNumberParser pars in m_apars)
{
if (pars.Parse(strAccountNumber.Length,
CreditCardNumber.ParseIssueIdentifier(strAccountNumber)))
{
eit = pars.IssuerType;
// Assumption: mutually exclusive types
break;
} // if( Parser.Parse()
} // foreach( CCNumberParser pars in m_apars )
return(eit);
} // ParsIssuerType()
} // ValidateUsingLuhnMethod()
/// <summary>
/// This internal function throws an null parameter exception as part
/// of the validation routine.
/// </summary>
/// <param name="strAccountNumber">
/// The input fully-qualified credit card number.
/// </param>
/// <returns>
/// This function returns true if the input passed the validation
/// check. Otherwise, false.
/// </returns>
internal static bool __ValidateAccountNumber(string strAccountNumber)
{
bool blnReturn = false;
if (null == strAccountNumber)
{
throw new ArgumentNullException(
kstrParameterName,
kstrExceptionMessageNull);
} // if( null == strAccountNumber )
// Parse the issuer and test against unknown and
// validate with Luhn method
if ((IssuerType.Unknown != ParsIssuerType(strAccountNumber)) &&
(CreditCardNumber.ValidateUsingLuhnMethod(strAccountNumber)))
{
blnReturn = true;
}
return(blnReturn);
} // __ValidateAccountNumber()
