使用Unity错误的ASP.NET Web API中的依赖注入

Question

我试图按照这个博客来实现与Unity的依赖注入,但我在boostrapper.cs中遇到错误(我使用Unity.MVC4库).有人能指出我在这里缺少什么吗？

错误:IoCContainer似乎没有实现Microsoft.Practices.ServiceLocation.IServiceLocator.参数名称: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!我在app_start中调用了bootrapper,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();
        }

我也有一种感觉,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"东西或类似的东西

 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

找到了答案,似乎博客已经过时,因为我甚至不必创建IoCContainer,因为我只需要安装Unity.WebAPI并设置DependencyResolver为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;
    }

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