private static void SaveChanges(ATMdata db)
{
int rowsAffected = db.SaveChanges();
//Console.WriteLine("({0} row(s) affected)", rowsAffected);
}
static void WithdrawMoney(string cardNumber, string cardPin)
{
if (cardNumber == null)
{
throw new ArgumentNullException("Card number cannot be null!");
}
if (cardPin == null)
{
throw new ArgumentNullException("Card PIN cannot be null!");
}
if (cardNumber.Length != 10)
{
throw new ArgumentException("Invalid card number! Card number must consist of 10 digits!");
}
if (cardPin.Length != 4)
{
throw new ArgumentException("Invalid card PIN! Card PIN must consist of 4 digits!");
}
var options = new TransactionOptions();
options.IsolationLevel = IsolationLevel.RepeatableRead;
using (var scope = new TransactionScope(TransactionScopeOption.Required, options))
{
using (var db = new ATMdata())
{
var acc = db.CardAccounts.FirstOrDefault(a => a.CardNumber == cardNumber && a.CardPIN == cardPin);
if (acc == null)
{
scope.Dispose();
throw new InvalidOperationException("Wrong CardNumber or PIN!");
}
PrintBalance(acc.CardCash);
decimal amount = GetClientInput(acc.CardCash);
if (amount < 0)
{
scope.Dispose();
throw new InvalidOperationException("You cannot withdraw negative amount!");
}
if (acc.CardCash < amount)
{
scope.Dispose();
throw new InvalidOperationException("Insufficient balance!");
}
acc.CardCash -= amount;
db.SaveChanges();
SaveTransactionHistory(cardNumber, amount, db);
PrintBalance(acc.CardCash);
}
scope.Complete();
}
}
private static void SaveTransactionHistory(string cardNumber, decimal amount, ATMdata db)
{
var options = new TransactionOptions
{
IsolationLevel = IsolationLevel.RepeatableRead,
Timeout = new TimeSpan(0, 0, 0, 10)
};
using (var scope = new TransactionScope(TransactionScopeOption.Required, options))
{
db.TransactionLogs.Add(new TransactionLog
{
CardNumber = cardNumber,
TransactionDate = DateTime.Now,
Amount = amount
});
db.SaveChanges();
scope.Complete();
}
}