asp.net-mvc - 使用 Unity 错误的 ASP.NET Web API 中的依赖注入(inject)

Question

我正在努力关注 this blog用于使用 Unity 实现依赖注入(inject)，但我在 boostrapper.cs 中遇到错误(我使用 Unity.MVC4 库)。有人可以指出我在这里缺少什么吗？

ERROR: IoCContainer does not appear to implement Microsoft.Practices.ServiceLocation.IServiceLocator. Parameter name: commonServiceLocator

 public static class Bootstrapper
    {
    public static IUnityContainer Initialise()
    {
      var container = BuildUnityContainer();

      DependencyResolver.SetResolver(new UnityDependencyResolver(container));

      // this throws "does not appear to implement Microsoft.Practices.ServiceLocation.IServiceLocator.... error"
      DependencyResolver.SetResolver(new IoCContainer(container)); 

      return container;
    }

    ....
  }

这是 IoCContainer 类

public class ScopeContainer : IDependencyScope
    {
        protected IUnityContainer container;

        public ScopeContainer(IUnityContainer container)
        {
            if (container == null)
            {
                throw new ArgumentNullException("container");
            }
            this.container = container;
        }

        public object GetService(Type serviceType)
        {
            if (container.IsRegistered(serviceType))
            {
                return container.Resolve(serviceType);
            }
            else
            {
                return null;
            }
        }

        public IEnumerable<object> GetServices(Type serviceType)
        {
            if (container.IsRegistered(serviceType))
            {
                return container.ResolveAll(serviceType);
            }
            else
            {
                return new List<object>();
            }
        }

        public void Dispose()
        {
            container.Dispose();
        }
    }

    class IoCContainer : ScopeContainer, IDependencyResolver
    {
        public IoCContainer(IUnityContainer container)
            : base(container)
        {
        }

        public IDependencyScope BeginScope()
        {
            var child = container.CreateChildContainer();
            return new ScopeContainer(child);
        }
    }

额外的!我在 app_start 中调用 Bootstrap ，我不确定它是否正确

protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();

            WebApiConfig.Register(GlobalConfiguration.Configuration);
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);

            Bootstrapper.Initialise();
        }

我也觉得它可能与路由有关，我实际上在配置中添加了经典的 MVC 路由，因为我读到 webapi 和 mvc 使用不同的“激活器”之类的东西

 public static class WebApiConfig
    {
        public static void Register(HttpConfiguration config)
        {
            config.Routes.MapHttpRoute(
                name: "DefaultApi",
                routeTemplate: "api/{controller}/{id}",
                defaults: new { id = RouteParameter.Optional }
            );

            config.Routes.MapHttpRoute(
              name: "RestApi",
              routeTemplate: "api/{controller}/{action}/{id}",
              defaults: new { id = RouteParameter.Optional }
            );

Answer 1

找到答案，好像博客已经过时了，因为我什至不必创建 IoCContainer，因为我只需要安装 Unity.WebAPI 并设置 DependencyResolver到 new Unity.WebApi.UnityDependencyResolver(container);

public static class Bootstrapper
  {
    public static IUnityContainer Initialise()
    {
      var container = BuildUnityContainer();

      DependencyResolver.SetResolver(new UnityDependencyResolver(container));

      GlobalConfiguration.Configuration.DependencyResolver = new Unity.WebApi.UnityDependencyResolver(container);

      return container;
    }

来源:http://netmvc.blogspot.com/2012/04/dependency-injection-in-aspnet-mvc-4.html