Question

我是Dependency Injeection的新手，并使用“Unity Mvc”作为我的DI容器。我有一个ProductRepository类，它使用我的dbContext类来获取数据，但是我想注册我的dbContext。这就是我的......

Partial Public Class websolutionsEntities
    Inherits DbContext
' Code for dbContext Class

' This is my Repo, which I want to fix
Public Class productsRepository
    Implements IProductRepository

    ' This line below I want to avoid, I dont want to rely on my dbContext for all repo's

    Private _db As websolutionsEntities = New websolutionsEntities()

这是我的Unity Bootstrap：

Private Shared Function BuildUnityContainer() As IUnityContainer
    Dim container = New UnityContainer()

    ' register all your components with the container here
    ' e.g. container.RegisterType<ITestService, TestService>();       
    container.RegisterType(Of IProductRepository, productsRepository)()


    Return container

End Function

我需要做什么，所以在我的回购中我可以避免创建dbContect类的新实例？

Answer 1

将用C＃语法回答，好吗？

为您的上下文创建一个界面：

public interface IWebSolutionEntities
{
}

public class WebSolutionEntities : IWebSolutionEntities
{
   ...
}

并将一个构造函数添加到存储库，这取决于此接口：

public class ProductsRepository : IProductsRepository
{
    private IWebSolutionEntities _db;

    public ProductsRepository(IWebSolutionEntities db)
    {
        _db = db;
    }
}

控制器依赖于存储库接口：

public class ProductsController : Controller
{
    private IProductsRepository _productsRepository;

    public ProductsController(IProductsRepository _productsRepository)
    {
        productsRepository = _productsRepository;
    }
}

然后，您需要在global.asax中注册依赖项解析器：

protected void Application_Start()
{
    DependencyResolver.SetResolver(new UnityDependencyResolver(UnityBootstrap.BuildUnityContainer()));
}

之后，UnityDependencyResolver实例将创建控制器。

DbContext类的依赖注入

1 个答案: