Class SwiftUtil

Global utility methods.

Inheritance

System.Object

SwiftUtil

Inherited Members

System.Object.Equals(System.Object)

System.Object.Equals(System.Object, System.Object)

System.Object.GetHashCode()

System.Object.GetType()

System.Object.MemberwiseClone()

System.Object.ReferenceEquals(System.Object, System.Object)

System.Object.ToString()

Namespace: Subsembly.Swift

Assembly: Subsembly.Sepa.dll

Syntax

public static class SwiftUtil

Fields

MAXCREDITCARDNOLENGTH

The maximum length of a credit card number according to IsValidCreditCardNo(String).

Declaration

public const int MAXCREDITCARDNOLENGTH = 16

Field Value

Type	Description
System.Int32

Remarks

Actually the official length range for payment card numbers is 8 through 19 digits. But in real life all credit card numbers are between 12 and 16 digits. Hence this constant has the value 16.

MINCREDITCARDNOLENGTH

The minimum length of a credit card number according to IsValidCreditCardNo(String).

Declaration

public const int MINCREDITCARDNOLENGTH = 12

Field Value

Type	Description
System.Int32

Remarks

Actually the official length range for payment card numbers is 8 through 19 digits. But in real life all credit card numbers are between 12 and 16 digits. Hence this constant has the value 12.

Methods

AppendLuhn(String)

Computes and appends a Luhn check digit to the given string.

Declaration

public static string AppendLuhn(string s)

Parameters

Type	Name	Description
System.String	s

Returns

Type	Description
System.String

Exceptions

Type	Condition
System.ArgumentNullException	The parameter s was null.

CoalesceSpaces(String)

Declaration

public static string CoalesceSpaces(string sText)

Parameters

Type	Name	Description
System.String	sText

Returns

Type	Description
System.String

ComputeLuhn(String, Int32)

Computes the Luhn check digit for the given string. The Luhn check is used, for example, with ISIN numbers and credit card numbers.

Declaration

public static char ComputeLuhn(string s, int n)

Parameters

Type	Name	Description
System.String	s	The string to compute the Luhn check digit for. Must not be null.
System.Int32	n	The number of characters to include in the check digit computation. Only the first n characters are used when computing the check digit. If this is zero, then the check digit for an empty string, i.e. '0', will be returned. Must not be negative.

Returns

Type	Description
System.Char	The computed check digit, which is in the range from '0' to '9'.

Exceptions

Type	Condition
System.ArgumentNullException	The parameter s was null.
System.ArgumentException	The parameter n was negative.
System.FormatException	The parameter s contains invalid characters.

IsValidCreditCardNo(String)

Fully validates the given credit card number

Declaration

public static bool IsValidCreditCardNo(string sCreditCardNo)

Parameters

Type	Name	Description
System.String	sCreditCardNo

Returns

Type	Description
System.Boolean	If the given string looks like a valid credit card number, then true is returned. If the parameter was null, an empty string or an otherwise invalid credit card number, then false is returned.

Remarks

Verifies the length, the character set and the Luhn check digit of the given credit card number. It does not verify the validity of the leading digits, yet.

LuhnCheck(String)

Computes and checks the check digits from the given string according to the Luhn algorithm. The Luhn check is used, for example, with ISIN numbers and credit card numbers.

Declaration

public static bool LuhnCheck(string s)

Parameters

Type	Name	Description
System.String	s	The string to check. If this is null or empty, then the result will be false.

Returns

Type	Description
System.Boolean	If the given string is correct accoring to the Luhn algorithm, then true is returned, otherwise false is returned.