private bool CanExecuteCardNumber()
{
return(CardNumber.All(char.IsDigit) && CardNumber.Length == 16);
}
/// <summary>
/// checks if credit card details are valid
/// </summary>
/// <returns>true if this card is valid</returns>
public bool IsValid()
{
var len = CardNumber.Length;
if (len == 0)
{
return(false);
}
// check for all numbers
if (!CardNumber.All(char.IsDigit))
{
return(false);
}
if (!CardVerificationValue.All(char.IsDigit))
{
return(false);
}
if (CardVerificationValue.Length != 3)
{
return(false);
}
// Check card not expired
if (Month > 12)
{
return(false);
}
var time = DateTime.Now;
if (time.Year > Year)
{
return(false);
}
if (time.Year == Year && time.Month > Month)
{
return(false);
}
using (var db = new BankSystemContext())
{
var query = from card in db.CreditCards
where card.Month == this.Month &&
card.Year == this.Year &&
card.CardNumber == this.CardNumber &&
card.CardVerificationValue == this.CardVerificationValue
select card.BankAccount;
BankAccountDetails found = query.FirstOrDefault();
this.BankAccount = found;
return(found != null);
}
}