using System;

using System.Collections.Generic;

using System.Linq;

​

public class Vehicle

{

}

​

public class Car : Vehicle

{

​

}

​

public class Program

{

    public static void Main()

    {

        List<Car> cars = new List<Car>();

        // How would you call ProcessVehicles on your list of cars?

        ProcessVehicles(cars.Select(car => car as Vehicle).ToList());

        // How would you change ProcessVehicles if you could?

        ProcessVehiclesIEnumerable(cars);

        ProcessVehiclesGeneric(cars);

    }

    private static void ProcessVehicles(List<Vehicle> vehicles) { Console.WriteLine("ProcessVehicles called successfully."); }

    private static void ProcessVehiclesIEnumerable(IEnumerable<Vehicle> vehicles) { Console.WriteLine("ProcessVehiclesIEnumerable called successfully."); }

​

    private static void ProcessVehiclesGeneric<T>(List<T> vehicles) where T : Vehicle { Console.WriteLine("ProcessVehiclesGeneric called successfully."); }

}