Requirements:
1. Start by downloading the CreditCardAttribute class and including it in your project somewhere. (Code shown below.
2. Decorate your data model with the attribute like so:
[CreditCard(ErrorMessage="Please enter a valid credit card number")]
public string CreditCardNumber { get; set; }
Done!!
And then, credit card types??
You can specify which cards you would like to accept using the AcceptedCardTypes named parameter. Do it like so:
[CreditCard(ErrorMessage="Please enter a valid credit card number",
AcceptedCardTypes=CreditCardAttribute.CardType.Visa | CreditCardAttribute.CardType.MasterCard)]
public string CreditCardNumber { get; set; }
You can use as many or as little of the card types as you like, making sure to use the bitwise OR ‘|’ operator to seprate them.
How to Create this Validator?
Here is the code:
public class CreditCardAttribute : ValidationAttribute
{
private CardType _cardTypes;
public CardType AcceptedCardTypes
{
get { return _cardTypes; }
set { _cardTypes = value; }
}
public CreditCardAttribute()
{
_cardTypes = CardType.All;
}
public CreditCardAttribute(CardType AcceptedCardTypes)
{
_cardTypes = AcceptedCardTypes;
}
public override bool IsValid(object value)
{
var number = Convert.ToString(value);
if (String.IsNullOrEmpty(number))
return true;
return IsValidType(number, _cardTypes) && IsValidNumber(number);
}
public override string FormatErrorMessage(string name)
{
return "The " + name + " field contains an invalid credit card number.";
}
public enum CardType
{
Unknown = 1,
Visa = 2,
MasterCard = 4,
Amex = 8,
Diners = 16,
All = CardType.Visa | CardType.MasterCard | CardType.Amex | CardType.Diners
AllOrUnknown = CardType.Unknown | CardType.Visa | CardType.MasterCard | CardType.Amex | CardType.Diners
}
private bool IsValidType(string cardNumber, CardType cardType)
{
// Visa
if (Regex.IsMatch(cardNumber, "^(4)")
&& ((cardType & CardType.Visa) != 0))
return cardNumber.Length == 13 || cardNumber.Length == 16;
// MasterCard
if (Regex.IsMatch(cardNumber, "^(51|52|53|54|55)")
&& ((cardType & CardType.MasterCard) != 0))
return cardNumber.Length == 16;
// Amex
if (Regex.IsMatch(cardNumber, "^(34|37)")
&& ((cardType & CardType.Amex) != 0))
return cardNumber.Length == 15;
// Diners
if (Regex.IsMatch(cardNumber, "^(300|301|302|303|304|305|36|38)")
&& ((cardType & CardType.Diners) != 0))
return cardNumber.Length == 14;
//Unknown
if ((cardType & CardType.Unknown) != 0)
return true;
return false;
}
private bool IsValidNumber(string number)
{
int[] DELTAS = new int[] { 0, 1, 2, 3, 4, -4, -3, -2, -1, 0 };
int checksum = 0;
char[] chars = number.ToCharArray();
for (int i = chars.Length - 1; i > -1; i--)
{
int j = ((int)chars[i]) - 48;
checksum += j;
if (((i - chars.Length) % 2) == 0)
checksum += DELTAS[j];
}
return ((checksum % 10) == 0);
}
}
The first thing to notice is that I have inherited from the ValidationAttribute. This takes care of most the work, allowing me to quickly and easily implement the actual validation. ValidationAttribute is just the default, you can also inherit from other classes within the System.ComponentModel.DataAnnotations namespace. The most useful of which is the RegularExpressionAttribute. Check it out, a simple currency validator:
public class CurrencyAttribute : RegularExpressionAttribute
{
public CurrencyAttribute() : base("^\\$?(\\d{1,3},?(\\d{3},?)*\\d{3}(\\.\\d{1,3})?|\\d{1,3}(\\.\\d{2})?)$")
{
}
}
That’s all you need to do to implement your own regular expression based validator.
Back to our Credit Card Validator, we’ll take a look at the only manditory method for creating a custom validator, the IsValid method.
public override bool IsValid(object value)
{
var number = Convert.ToString(value);
return IsValidType(number, _cardTypes) && IsValidNumber(number);
}
Its very simple, you get the value to validate as an object and you must return a boolean showing whether or not it passed validation. The rest of the methods in the credit card validator are helpers to decide if the card is valid, and an enum to represent card types.
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