public static void MainX()
{
var emp = new Employee();
emp.SetSalary(-1000); //этот метод вызовет runtime exception.
//emp.Salary = -1000; //обращаться к Salary можно только изнутри класса Employee.
//Console.WriteLine(emp.Salary); //так делать тоже нельзя. Как же получить это значение?
}
public static void MainX()
{
Client client = new Client();
Person person = new Person();
Employee employee = new Employee();
Console.WriteLine(client is Person);
Console.WriteLine(person is Person);
Console.WriteLine(client is Client);
Console.WriteLine(person is Client);
Console.WriteLine(employee is Client);
Person clientAsPerson = client;
Console.WriteLine(clientAsPerson is Client);
Client correctClient1 = clientAsPerson as Client;
Client correctClient2 = (Client)clientAsPerson;
Client incorrentClient1 = person as Client; // = null
Client incorrectClient2 = (Client)person; //выкинет исключение, т.к. person не является Client
//Client incorrectClient3 = (Client)employee; // синтаксически невозможно
}