Constructor Injection Large Example

ConstructoInjectionr.cs

using System;
using System.Linq;
namespace DI
{
    class Program
    {
        static void Main(string[] args)
        {
            var manager = new OrderManager(
            new OrderAccessor(), new EmailAccessor());
            manager.SendNotification(1);
        }
    }
    class Order
    {
        public int Id { get; set; }
        public decimal Total { get; set; }
    }
    interface IOrderAccessor
    {
        Order Find(int id);
    }
    interface IEmailAccessor
    {
        void SendEmail(Order order);
    }
    interface IOrderManager
    {
        void SendNotification(int id);
    }
    class OrderAccessor : IOrderAccessor
    {
        static Order[] Orders = new Order[] { new Order() { Id = 1, Total = 100.00M } };
        public Order Find(int id)
        {
            return Orders.First(o => o.Id == id);
        }
    }
    class EmailAccessor : IEmailAccessor
    {
        public void SendEmail(Order order)
        {
            Console.WriteLine($"ID={order.Id}");
        }
    }
    class OrderManager : IOrderManager
    {
        IOrderAccessor OrderAccessor { get; set; }
        IEmailAccessor EmailAccessor { get; set; }
        public OrderManager(IOrderAccessor orderAccessor, IEmailAccessor emailAccessor)
        {
            OrderAccessor = orderAccessor;
            EmailAccessor = emailAccessor;
        }
        public void SendNotification(int id)
        {
            var order = OrderAccessor.Find(id);
            EmailAccessor.SendEmail(order);
        }
    }
}