public static void Main()
{
var context = new ATMEntities();
var requiredAmount = 200M;
WithdrawMoneyExtended(context, requiredAmount);
}
public static void WithdrawMoney(string cardNumber, string pinNumber, decimal money)
{
using (var context = new ATMEntities())
{
using (var dbContextTransaction = context.Database.BeginTransaction(IsolationLevel.RepeatableRead))
{
try
{
if (CheckIsValid(context, cardNumber, pinNumber))
{
if (CheckIsHasMoney(context, cardNumber, money))
{
var currentEntity = context.CardAccounts.First(c => c.CardNumber == cardNumber && c.CardPIN == pinNumber);
currentEntity.CardCach = currentEntity.CardCach - money;
context.SaveChanges();
Console.WriteLine("You have got your money!Amount after withdraw {0}!", currentEntity.CardCach);
}
}
dbContextTransaction.Commit();
}
catch (Exception e)
{
dbContextTransaction.Rollback();
Console.WriteLine("Transaction cancled!\nError occured: {0}", e.Message);
}
}
}
}
private static bool CheckIsHasMoney(ATMEntities context, string cardNumber, decimal money)
{
var currentEntity = context.CardAccounts.First(c => c.CardNumber == cardNumber);
if (currentEntity.CardCach >= money)
{
return(true);
}
throw new Exception("You do not have enough money!");
}
private static bool CheckIsValid(ATMEntities context, string cardNumber, string pinNumber)
{
try
{
var currentEntity = context.CardAccounts.First(c => c.CardNumber == cardNumber && c.CardPIN == pinNumber);
}
catch (Exception)
{
throw new Exception("You're entering a wrong card number or PIN!");
}
return(true);
}
private static void WithdrawMoneyExtended(ATMEntities context, decimal amount)
{
using (var dbContextTransaction = context.Database.BeginTransaction())
{
try
{
var account = context.CardAccounts.First();
if (account.CardNumber.Length != 10)
{
throw new InvalidOperationException("Card Number is invalid");
}
if (account.CardPIN.Length != 4)
{
throw new InvalidOperationException("Card PIN is invalid");
}
if (account.CardCash < amount)
{
throw new InvalidOperationException("Not enough money in the account.");
}
account.CardCash = account.CardCash - amount;
var transactionHistory = new TransactionHistory
{
CardNumber = account.CardNumber,
TransactionDate = DateTime.Now,
Amount = amount
};
context.TransactionHistories.Add(transactionHistory);
context.SaveChanges();
dbContextTransaction.Commit();
Console.WriteLine("Withdraw was successful.");
}
catch (InvalidOperationException ioe)
{
Console.WriteLine(ioe.Message);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
}
