using System;

using Unity;

​

public class Program

{

    public static void Main()

    {

        var calendarSerivce = UnityConfig.Container.Resolve<ICalendarService>();

        Console.WriteLine($"Price: {calendarSerivce.GetPrice(DateTime.Today, DateTime.Today.AddDays(5))}");

        // Output:

        // 

        // Price: 600.00

    }

}

​

#region Unity

public static class UnityConfig

{

    private static Lazy<IUnityContainer> _container = new Lazy<IUnityContainer>(() => ConfigureContainer());

    public static IUnityContainer Container => _container.Value;

    private static IUnityContainer ConfigureContainer()

    {

        var container = new UnityContainer();

        container.RegisterType<IPriceService, PriceService>();

        container.RegisterType<ICalendarService, CalendarService>();

        return container;

    }

}

​

#endregion

​

#region Interfaces

​

public interface IPriceService

{

    decimal GetUplift(decimal rate, decimal uplift);

}

​

public interface ICalendarService

{

    decimal GetPrice(DateTime startDate, DateTime endDate);

}

​

#endregion

​

#region Services

public class PriceService : IPriceService

{

    private readonly ICalendarService _calendarService;

​

    public PriceService(ICalendarService calendarService)

    {

        _calendarService = calendarService;

    }

​

    public decimal GetUplift(decimal rate, decimal uplift)

    {

        return rate * (uplift / 100M);

    }

}

​

public class CalendarService : ICalendarService

{

    private readonly IPriceService _priceService;

​

    public CalendarService(IPriceService priceService)

    {

        _priceService = priceService;

    }

​

    public decimal GetPrice(DateTime startDate, DateTime endDate)

    {

        var rate = (decimal)(endDate - startDate).TotalDays * 100.0M;

        return rate + _priceService.GetUplift(rate, 20.0M);

    }

}

​

#endregion