Class CardNumberExtensions

Namespace

HeroKit.Banking

Assembly

HeroKit.dll

Contains extension methods for validating payment card numbers and detecting the card brand.

public static class CardNumberExtensions

Inheritance

object

CardNumberExtensions

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

object.ToString()

Remarks

Spaces and dashes are ignored. Any other non-digit character makes the number invalid. The checks cover format and the Luhn checksum. They do not confirm that a card exists.

Methods

GetCardBrand(string?)

Detects the brand of a payment card from its prefix and length.

public static CardBrand GetCardBrand(this string? value)

Parameters

value string

The card number. Spaces and dashes are ignored.

Returns

CardBrand

The detected brand, or Unknown if no brand matches or the input is not made of digits.

Examples

"4111111111111111".GetCardBrand(); // CardBrand.Visa
"378282246310005".GetCardBrand();   // CardBrand.AmericanExpress

Remarks

The Luhn check is not required here. Use IsValidCardNumber(string?) for that.

IsValidCardNumber(string?)

Determines whether a string is a valid payment card number.

public static bool IsValidCardNumber(this string? value)

Parameters

value string

The card number to check. Spaces and dashes are ignored.

Returns

bool

true if the number has 12 to 19 digits and passes the Luhn check; otherwise, false. Null or empty input returns false.

Examples

"4111 1111 1111 1111".IsValidCardNumber(); // true
"4111111111111112".IsValidCardNumber();    // false