public WebMailClient(MailAccount mail)
{
this.Account = mail;
Account.Received += Account_Received; //подписка на событие
Account.Received += (s, m) => { Console.WriteLine($"Web-clien {m.Author} {m.Subject}"); }; //подписка на событие лямбда выражением
}
static void Main(string[] args)
{
Console.WriteLine("Дегаты и события");
Operation sum = Sum;//объявление и инициализация переменной типа делегата
Operation div = Div;
Operation an = delegate(int x, int y) { return(x * y); };
Operation lamba = (x, y) => x / y;
Procudure p = () => Console.WriteLine("This is procedure");
//передеча в параметр метода переменной типа делегата
Calculation(5, 4, sum);
Calculation(-5, -4, div);
Console.WriteLine(an(2, 3));
MailAccount account = new MailAccount();
WebMailClient webClient = new WebMailClient(account);
MobileMailClient mobileClient = new MobileMailClient(account);
account.Send(new Message {
Author = "Ivan", Subject = "Test", Body = "Hi!!!"
});
account.Receive(new Message {
Author = "Ivan", Subject = "Re:Test", Body = "Hello!!!"
});
int?age = null;
if (age.HasValue)
{
Console.WriteLine(age.Value);
}
else
{
Console.WriteLine("Value is null");
}
Console.WriteLine(age ?? -9999);
age = 55;
Console.WriteLine(age ?? -9999);
Nullable <int> age2 = null;
}
public MobileMailClient(MailAccount account)
{
this.Account = account;
this.Account.Received += Account_Received; //подписка на событие
this.Account.Sended += Account_Sended; //подписка на событие
}
