using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
public class TransactionEventArgs : EventArgs
{
private int _transactionAmount;
// "Credited": deposit
// "Debited" : withdraw
private string _transactionType;
public TransactionEventArgs(int amt, string type)
{
this._transactionAmount = amt;
this._transactionType = type;
}
public int TranactionAmount
{
get
{
return _transactionAmount;
}
}
public string TranactionType
{
get
{
return _transactionType;
}
}
}
/*like:
public delegate void EventHandler(object sender, EventArgs e);
*/
public delegate void TransactionHandler(object sender, TransactionEventArgs e);
class Account
{
//like:
//public event EventHandler Click;
//
//the TransactionMade event and its TransactionHandler delegate(s)
public event TransactionHandler TransactionMade; // Event Definition
public int BalanceAmount;
public Account(int amount)
{
this.BalanceAmount = amount;
}
//publisher invokes a event
public void Debit(int debitAmount)
{
if (debitAmount < BalanceAmount)
{
BalanceAmount = BalanceAmount - debitAmount;
TransactionEventArgs e = new TransactionEventArgs(debitAmount, "Debited");
OnTransactionMade(e); // Debit transaction made
}
}
public void Credit(int creditAmount)
{
BalanceAmount = BalanceAmount + creditAmount;
TransactionEventArgs e = new TransactionEventArgs(creditAmount, "Credited");
OnTransactionMade(e); // Credit transaction made
}
protected virtual void OnTransactionMade(TransactionEventArgs e)
{
if (TransactionMade != null)
{
TransactionMade(this, e); // Raise the event
}
}
}
class TestMyEvent
{
private static void SendNotification(object sender, TransactionEventArgs e)
{
Console.WriteLine(
"Your Account is {0} for ${1} ",
e.TranactionType,
e.TranactionAmount);
}
private static void Main()
{
Account MyAccount = new Account(10000);
//like: this.button1.Click += new System.EventHandler(this.button1_Click);
//
//note: the += operator of event will subscribe the event append a delegate
MyAccount.TransactionMade += new TransactionHandler(SendNotification);
MyAccount.Credit(500);
Console.WriteLine("Your Current Balance is : " + MyAccount.BalanceAmount);
Console.ReadLine();
}
}
