designPattern/DesignPattern/State-VendingMachineExample/DispenseChangeState.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace State_VendingMachineExample
{
    internal class DispenseChangeState : VMState
    {
        public DispenseChangeState(VendingMachine context)
        {
            vendingMachine = context;
        }

        public override void AddMoney(decimal money)
        {
            throw new ApplicationException();
        }

        public override void ReturnChange(decimal money)
        {
            // Return charge here
            if (vendingMachine.Money > 0)
            {
                Console.WriteLine($"Return charge ${money}");
                vendingMachine.Money -= money;
            }

            vendingMachine.State = vendingMachine.ReadyState;
        }

        public override void SelectItem(int itemId)
        {
            throw new ApplicationException();
        }
    }
}