static void Main(string[] args)
{
#region DelegatesEvents
MathService service = new MathService();
new List <IMathPerformService> {
new LogginService(), new NotificationService()
}.ForEach(serv => service.MathPerformed1 += serv.OnMathPerformed);
// service.MathPerformed += OnOutBountEvent;
service.MathPerformed1 += (sender, e) => //is the same as = delegate(object sender, MathPerformedEventArgs args){
{
System.Console.WriteLine($"Calculation RESULT {e.MathResult}");
};
service.AddNumbers(4, 5);
service.MathPerformed2 += (res) =>
{
System.Console.WriteLine($"Calculation RESULT {res}");
};
service.CalculateNumbers2(3, 3, (val1, val2) => val1 + val2); //(val1, val2) => {return val1 + val2;}); 2.1
#endregion
#region Covariance and Contravariance
IBank <DepositAccount> depositBank = new Bank <DepositAccount>();
Account acc1 = depositBank.CreateAccount(34);
IBank <Account> ordinaryBank = new Bank <DepositAccount>();
Account acc2 = ordinaryBank.CreateAccount(45);
#endregion
System.Console.ReadLine();
}