// http://www.regular-expressions.info/creditcard.html
public CardType GetCCType(string proposedNumber)
{
Regex reg = new Regex("");
if (proposedNumber.Length < Card.CC_LEN_FOR_TYPE)
{
return(CardType.UNKNOWN);
}
CardType lastcardtype = System.Enum.GetValues(typeof(CardType)).Cast <CardType> ().Last();
for (int idx = 0; idx < (int)lastcardtype; ++idx)
{
switch (idx)
{
case (int)CardType.VISA:
reg = visaTypeReg;
break;
case (int)CardType.MASTERCARD:
reg = mcTypeReg;
break;
case (int)CardType.AMEX:
reg = amexTypeReg;
break;
case (int)CardType.MAESTRO:
reg = maestroTypeReg;
break;
}
CSRange range = new CSRange(0, Card.CC_LEN_FOR_TYPE);
var matches = reg.Matches(proposedNumber.Substring(range.Location, range.Length));
if (matches != null)
{
if (matches.Count == 1)
{
return((CardType)idx);
}
}
}
return(CardType.UNKNOWN);
}
internal string FormatForViewing(string enteredNumber)
{
string cleaned = CleanNumber(enteredNumber);
int len = cleaned.Length;
if (len <= Card.CC_LEN_FOR_TYPE)
{
return(cleaned);
}
CSRange r2 = new CSRange();
r2.Location = 0;
CSRange r3 = new CSRange();
r3.Location = 0;
CSRange r4 = new CSRange();
r4.Location = 0;
string[] gaps = new string[] { @"", @"", @"" };
int[] segmentLengths = new int[3] {
0, 0, 0
};
switch (GetCCType(enteredNumber))
{
case CardType.VISA:
case CardType.MASTERCARD:
case CardType.DISCOVER: // { 4-4-4-4}
case CardType.MAESTRO:
segmentLengths [0] = 4;
segmentLengths [1] = 4;
segmentLengths [2] = 4;
break;
case CardType.AMEX: // {4-6-5}
segmentLengths [0] = 6;
segmentLengths [1] = 5;
break;
case CardType.DINERS_CLUB: // {4-6-4}
segmentLengths [0] = 6;
segmentLengths [1] = 4;
break;
default:
return(enteredNumber);
}
len -= Card.CC_LEN_FOR_TYPE;
CSRange[] r = new CSRange[3] {
r2, r3, r4
};
int totalLen = Card.CC_LEN_FOR_TYPE;
for (int idx = 0; idx < 3; ++idx)
{
int segLen = segmentLengths [idx];
r [idx].Location = totalLen;
r [idx].Length = len >= segLen ? segLen : len;
totalLen += segLen;
len -= segLen;
gaps [idx] = @" ";
if (len <= 0)
{
break;
}
}
string segment1 = enteredNumber.Substring(0, Card.CC_LEN_FOR_TYPE);
string segment2 = r2.Location == 0 ? @"" : enteredNumber.Substring(r2.Location, r2.Length);
string segment3 = r3.Location == 0 ? @"" : enteredNumber.Substring(r3.Location, r3.Length);
;
string segment4 = r4.Location == 0 ? @"" : enteredNumber.Substring(r4.Location, r4.Length);
;
string ret = string.Format(@"{0}{1}{2}{3}{4}{5}{6}",
segment1, gaps [0],
segment2, gaps [1],
segment3, gaps [2],
segment4);
return(ret);
}