Switch Expression - Pattern Matching

using System;

//Only available in C# 8.0. Using .NET Core 3.1

namespace switchStatementExample
{

    public class Program
    {
        public static void Main()
        {
            var tollCalc = new TollCalculator();

            var car = new Car();
            var bus = new Bus();
            var taxi = new Taxi();

            Console.WriteLine($"The standard toll for a car is {tollCalc.CalculateToll(car)}");
            Console.WriteLine($"The standard toll for a bus is {tollCalc.CalculateToll(bus)}");
            Console.WriteLine($"The standard toll for a taxi is {tollCalc.CalculateToll(taxi)}");
        }
    }

    // Create new classes for different types of vehicles

    public class Car
    {
        public int passengers {get; set;}
    }

    public class Bus
    {
        public int passengers {get; set;}
    }

    public class Taxi
    {
        public int passengers {get; set;}
    }

    // Class to calculate the toll based on the type of object beign used.

    public class TollCalculator
    {
        public decimal CalculateToll(object vehicle) =>
            vehicle switch
            {
                Car c => 2.00m,
                Bus b => 10.00m,
                Taxi t => 4.00m,
                { } => throw new ArgumentException(message: "Not a known vehicle type", paramName: nameof(vehicle)),
                null => throw new ArgumentNullException(nameof(vehicle))
            };
    }
}