Question

public class BaseController : Controller
{
    [Inject]
    public IUnitOfWork UnitOfWork { get; set; }
    private readonly ISomeService _someService ;

    public BaseController(ISomeService someService)
    {
        _someService = someService;
    }

    public void Contacts()
    {
        contacts = _someService .GetById(1);
        ViewBag.someThing = contacts; //Add whatever
    }

    public BaseController()
    {

    }
}

当我在someService中发送:base时，我可以从中获取数据。但是，我不想将someService从AboutController等每个控制器发送到BaseController并写入太多代码。

public class HomeController : BaseController
{

    private readonly ISomeService someService;

    public HomeController(ISomeService someService) : base(someService)
    {
        _someService = someService;
    }
}

public class AboutController : BaseController
{
    private readonly IAboutService _aboutService;
    public AboutController (IAboutService aboutService) 
    {
        _aboutService = aboutService;
    }
}

所以在AboutController视图中我仍然希望获得someService的数据而不将参数发送到BaseController

Answer 1

简短的回答将分为两种情况：

如果您想使用基本控制器中的ISomeService，您必须通过基本构造函数传递该服务，如下所示：

public class AboutController : BaseController
{
     private readonly IAboutService _aboutService;
     public AboutController (IAboutService aboutService, ISomeService someService)  : base(someService)
     {
         _aboutService = aboutService;
     }
}

如果您不想使用该服务，请使用默认的基本构造函数，否则如果您尝试访问它，它将为null：

public class AboutController : BaseController
{
   private readonly IAboutService _aboutService;
   public AboutController (IAboutService aboutService)  : base()
   {
       _aboutService = aboutService;
    }
}

您处于第一个场景中，因此需要通过构造函数传递它才能初始化它！

但是如果你想打破模式，你会选择其他方式将服务注入基础控制器：

首先使用自动属性：

例如：

public ISomeService SomeService { get; set;}

另一种方法是使用DependecyResolver来获取服务的实例，但这会“破坏”某种方式的DI模式，这将使测试等更难。但如果你选择这样做，这里是代码为此：

  public class BaseController : Controller
  {
     [Inject]
     public IUnitOfWork UnitOfWork { get; set; }
     private readonly ISomeService _someService ;

     public BaseController(ISomeService someService)
     {
         _someService = someService;
     }

     public void Contacts()
     {
         contacts = _someService .GetById(1);
         ViewBag.someThing = contacts; //Add whatever
     }

     public BaseController()
     {
          _someService = DependencyResolver.Current.GetService<ISomeService >();
     }
}

有关详细信息，请参阅此问题here

BaseController的重载构造函数没有被执行？

1 个答案: