한 걸음 한 걸음 IOC

class Program
{
    static void Main(string[] args)
    {
        var shop=new Shop();
        shop.Add();
        shop.Delete();
        Console.ReadKey();
    }
}
class Shop
{
    readonly Log4NetServices _logServices;

    public Shop()
    {
        _logServices = new Log4NetServices();
    }

    public void Add()
    {
        _logServices.Write("    ");
    }

    public void Delete()
    {
        _logServices.Write("    ");
    }
}

의지하다

부어 넣다

class Program
{
    static void Main(string[] args)
    {
        var shop=new Shop(new Log4NetServices());
        shop.Add();
        shop.Delete();
        shop=new Shop(new FileLogServices());
        shop.Add();
        shop.Delete();
        Console.ReadKey();
    }
}
class Shop
{
    readonly ILogServices _logServices;

    public Shop(ILogServices logServices)
    {
        _logServices = logServices;
    }

    public void Add()
    {
        _logServices.Write("    ");
    }

    public void Delete()
    {
        _logServices.Write("    ");
    }
}

IOC

class Program
{
    static void Main(string[] args)
    {
        var serviceCollection = new ServiceCollection();
        serviceCollection.AddSingleton();
        var serviceProvider = serviceCollection.BuildServiceProvider();
        var logServices = serviceProvider.GetService();
        var shop = new Shop(logServices);
        shop.Add();
        shop.Delete();
        Console.ReadKey();
    }
}