Inversify 和 Inversify-inject-decorators

这是一个很好的例子，可以让您轻松理解如何反转和反转注入装饰词。

我将按照以下每个步骤改进代码：

第1步：普通课

public class Cart
{
    private readonly IDatabase _db;
    private readonly ILogger _log;
    private readonly IEmailSender _es;

    public Cart()
    {
        _db = new Database();
        _log = new Logger();
        _es = new EmailSender();
    }

    public void Checkout(int orderId, int userId)
    {
        _db.Save(orderId);
        _log.LogInfo("Order has been checkout");
        _es.SendEmail(userId);
    }
}

第 2 步：应用依赖注入

public Cart(IDatabase db, ILogger log, IEmailSender es)
{
        _db = db;
        _log = log;
        _es = es;
 }

 //Dependency Injection simple way
 Cart myCart = new Cart(new Database(),
                   new Logger(), new EmailSender());
 //When you want to change new class. Update here
 myCart = new Cart(new XMLDatabase(),
              new FakeLogger(), new FakeEmailSender());

第 3 步：应用依赖图绑定

//Create each Interface
DIContainer.SetModule<IDatabase, Database>();
DIContainer.SetModule<ILogger, Logger>();
DIContainer.SetModule<IEmailSender, EmailSender>();

DIContainer.SetModule<Cart, Cart>();

//MyCart just need to use it
var myCart = DIContainer.GetModule(); 
public Cart()
    {
        _db = DIContainer.GetModule();
        _log = DIContainer.GetModule();
        _es = DIContainer.GetModule();
    }

//When you want to change some module in Cart. Just need to change in where it define.
DIContainer.SetModule<IDatabase, XMLDatabase>();`

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