static void Main(string[] args)
{
var atmContext = new ApplicationDbContext();
atmContext.Database.Initialize(true);
PrintAllCards();
using (atmContext)
{
// for invalid data try with different pin, cardNumber and moneyToWithdraw to use that nothing happens
int pin = 1111;
int cardNumber = 1234567890;
decimal moneyToWithdraw = 200M;
if (WithdrawMoney(pin, cardNumber, moneyToWithdraw, atmContext))
{
Console.WriteLine("\nMoney withdrawn\n");
}
else
{
Console.WriteLine("\nCan not withdraw money.\n");
}
}
PrintAllCards();
}
public static bool WithdrawMoney(int pin, int cardNumber, decimal moneyToWithdraw, ApplicationDbContext context)
{
var transactionScope = new TransactionScope(
TransactionScopeOption.RequiresNew,
new TransactionOptions()
{
IsolationLevel = (System.Transactions.IsolationLevel) IsolationLevel.RepeatableRead
});
using (transactionScope)
{
var card = context.CardAccounts.FirstOrDefault(c => c.CardNumber == cardNumber);
var isPinValid = card != null && card.CardPin == pin;
var isAmountValid = card.CardCash >= moneyToWithdraw;
if (isAmountValid && isPinValid )
{
card.CardCash -= moneyToWithdraw;
transactionScope.Complete();
}
else
{
return false;
}
}
AddTransactionToHistory(cardNumber, moneyToWithdraw, context);
context.SaveChanges();
return true;
}
private static void AddTransactionToHistory(int cardNumber, decimal moneyToWithdraw, ApplicationDbContext context)
{
var transactionScope = new TransactionScope(
TransactionScopeOption.RequiresNew,
new TransactionOptions()
{
IsolationLevel = (System.Transactions.IsolationLevel) IsolationLevel.RepeatableRead
});
using (transactionScope)
{
context.TransactionHistories.Add(new TransactionHistory()
{
TransactionDate = DateTime.Now,
Ammount = moneyToWithdraw,
CardNumber = cardNumber
});
transactionScope.Complete();
}
}
private static void PrintAllCards()
{
using (var context = new ApplicationDbContext())
{
foreach (var card in context.CardAccounts)
{
Console.WriteLine("ID:{0} -> Money: {1}", card.Id, card.CardCash);
}
}
}
