c# - 如何解决错误 :the type does not appear to implement microsoft. practices.servicelocation.iservicelocator？

Question

我是 MVC 的新手，我正在关注“Adam Freeman 的 PRO ASP.NET MVC 4”。我目前正在研究它的第 6 章。我正在学习如何使用 MVC 4 中的 Ninject 进行依赖注入(inject)。我已经按照书中的描述创建了应用程序。现在我不明白为什么会出现以下错误:

该类型似乎没有实现 microsoft.practices.servicelocation.iservicelocator

这是我的 Controller 代码:

public class HomeController : Controller
{
    private Product[] products = {
        new Product {Name = "Kayak", Category = "Watersports", Price = 275M},
        new Product {Name = "Lifejacket", Category = "Watersports", Price = 48.95M},
        new Product {Name = "Soccer ball", Category = "Soccer", Price = 19.50M},
        new Product {Name = "Corner flag", Category = "Soccer", Price = 34.95M}
    };
    private IValueCalculator calc;
    public HomeController(IValueCalculator calcParam)
    {
        calc = calcParam;
    }
    public ActionResult Index()
    {
        ShoppingCart cart = new ShoppingCart(calc) { Products = products };
        decimal totalvalue = cart.CalculateProductTotal();
        return View(totalvalue);
    }
}

我创建了一个名为“NinjectDependencyResolver”的类，如下所示:

public class NinjectDependencyResolver : DependencyResolver
{
    private IKernel kernal;

    public NinjectDependencyResolver()
    {
        kernal = new StandardKernel();
        AddBindings();
    }


    public object GetService(Type serviceType)
    {
        return kernal.TryGet(serviceType);
    }

    public IEnumerable<object> GetServices(Type serviceType)
    {
        return kernal.GetAll(serviceType);
    }

    private void AddBindings()
    {
        kernal.Bind<IValueCalculator>().To<LinqValueCalculator>();
    }
}

更改全局文件如下:

public class MvcApplication : System.Web.HttpApplication
{
    protected void Application_Start()
    {
        AreaRegistration.RegisterAllAreas();

        DependencyResolver.SetResolver( new NinjectDependencyResolver());
        WebApiConfig.Register(GlobalConfiguration.Configuration);
        FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
        RouteConfig.RegisterRoutes(RouteTable.Routes);
    }
}

关于“DependencyResolver.SetResolver( new NinjectDependencyResolver());”我收到错误的这一行:

he type EssentialTools.Infrastructure.NinjectDependencyResolver does not appear to implement Microsoft.Practices.ServiceLocation.IServiceLocator.

参数名称:commonServiceLocator

请帮帮我，我该如何解决这个错误。

提前致谢。

Answer 1

一年后，我遇到了同样的问题......感谢pdb的回答，我找到了解决方法。在自定义的 NinjectDependencyResolver 中强制使用 System.Web.Mvc.IDependencyResolver 而不是 System.Web.Http.DependencyResolver 在其他情况下会导致转换问题部分代码需要 System.Web.Http.Dependencies.IDependencyResolver。例如，当您尝试概括自定义 DI 时:

GlobalConfiguration.Configuration.DependencyResolver =
    new NinjectDependencyResolver(kernel)

在我的例子中，我实现了 IDependencyResolver 并且它的工作方式如下:

public class NinjectDependencyResolver
    : NinjectDependencyScope
    , IDependencyResolver
    , System.Web.Mvc.IDependencyResolver