public static void WithdrawMoney(decimal amount, string cardPin, string cardNumber)
{
using (var atmEntities = new ATMEntities())
{
using (var transaction = atmEntities.Database.BeginTransaction())
{
var currentCard = atmEntities.CardAccounts.FirstOrDefault(c => c.CardNumber == cardNumber && c.CardPIN == cardPin);
if (currentCard == null)
{
transaction.Rollback();
throw new ArgumentNullException("There are no Card Account in database with this Pin or card number.");
}
if (currentCard.CardCash < amount)
{
transaction.Rollback();
throw new InvalidOperationException("You don't have enough money.");
}
currentCard.CardCash -= amount;
LogWithdrawalTransaction(cardNumber, amount);
atmEntities.SaveChanges();
transaction.Commit();
Console.WriteLine("Transaction completed.");
}
}
}
private static void LogWithdrawalTransaction(string cardNumber, decimal amount)
{
using (var atmEntities = new ATMEntities())
{
atmEntities.TransactionHistories.Add(
new TransactionHistory { Amount = amount, CardNumber = cardNumber, TransactionDate = DateTime.Now });
atmEntities.SaveChanges();
}
}
static void Main()
{
var context = new ATMEntities();
string cardNumber = String.Empty;
decimal amountToWithdraw = 0;
var accountToWithdraw = context.CardAccounts.Find(1);
var threwException = false;
// Unfinished!
while (true)
{
try
{
Console.WriteLine("Please enter the card number: ");
cardNumber = Console.ReadLine();
Console.WriteLine("Please enter the card PIN: ");
string cardPin = Console.ReadLine();
Console.WriteLine("Please enter the amount to withdraw: ");
amountToWithdraw = decimal.Parse(Console.ReadLine());
if (amountToWithdraw > accountToWithdraw.CardCash || accountToWithdraw.CardCash == null)
{
throw new ArgumentOutOfRangeException(
"You cannot withdraw more cash than what you currently have: " + accountToWithdraw.CardCash);
}
using (var transaction = context.Database.BeginTransaction())
{
}
}
catch (ArgumentOutOfRangeException ex)
{
Console.WriteLine(ex.Message);
threwException = true;
}
if (!threwException)
{
context.TransactionHistories.Add(new TransactionHistory()
{
CardNumber = cardNumber,
Amount = amountToWithdraw,
TransactioDate = DateTime.Now
});
}
}
}
static void Main(string[] args)
{
var account = new CardAccount();
account.CardNumber = "9876543";
account.CardPin = "22222";
decimal transactionMoney = 500;
var tran = new TransactionScope();
using (tran)
{
try
{
var dbCon = new ATMEntities();
var card = (from c in dbCon.CardAccounts
where c.CardNumber == account.CardNumber
select c).FirstOrDefault();
if (card == null)
{
throw new InvalidOperationException(" Current Card does not exist! ");
}
else
{
if (account.CardPin == card.CardPin)
{
if (account.CardCash > 200 && account.CardCash - transactionMoney > 0)
{
account.CardCash -= transactionMoney;
dbCon.CardAccounts.Attach(account);
dbCon.SaveChanges();
}
else
{
throw new ArgumentException("There are not enough money in your card!");
}
}
else
{
throw new ArgumentException("Wrong Pin! Try again!");
}
}
}
catch (Exception ex)
{
Console.WriteLine("Transaction was not completed successfully! " + ex.Message.ToString());
}
}
}