PROSAGA码农传奇-IDataAPI-Autofac：类型“ MyController”没有默认的构造函数

我有一个使用另一个REST Api客户端的Web Api应用程序。我将REST API客户端包装到服务中。
<pre><code>myproj / services / PostDataService.cs

public interface IPostDataService
 {
 Task<IList<Post>> GetAllPosts();
 }

public class PostDataService : IPostDataService
    {
        private static IDataAPI NewDataAPIClient()
        {
            var client = new DataAPI(new Uri(ConfigurationManager.AppSettings["dataapi.url"]));
            return client;
        }

public async Task<IList<Post>> GetAllPosts()
 {
 using (var client = NewDataAPIClient())
 {
 var result = await client.Post.GetAllWithOperationResponseAsync();
 return (IList<Post>) result.Response.Content;
 }
 }
 }
 ....
</code></pre>我正在使用AutoFac并将服务注入到控制器中
<pre><code>myproj / controllers / PostController.cs

public class PostController : ApiController
    {
        private readonly IPostDataService _postDataService;

public PostController(IPostDataService postDataService)
        {
            _postDataService = postDataService;
        }

public async Task<IEnumerable<Post>> Get()
 {
 return await _postDataService.GetAllPosts();
 }
 }
</code></pre>但我收到此错误。尝试创建类型为“ PostController”的控制器时发生错误。确保控制器具有无参数的公共构造函数。这是我的Global.asax.cs
<pre><code>public class WebApiApplication : System.Web.HttpApplication
 {
 protected void Application_Start()
 {
 ContainerConfig.Configure();
 GlobalConfiguration.Configure(WebApiConfig.Register);
 }
 }

public static class ContainerConfig
    {
        private static IContainer _container;

public static IContainer GetContainer()
        {
            if (_container != null)
                return _container;

var builder = new ContainerBuilder();

builder.RegisterType<PostDataService>()
 .AsSelf()
 .InstancePerLifetimeScope()
 .AsImplementedInterfaces();

_container = builder.Build();

return _container;
        }

public static IContainer Configure()
        {
            var container = GetContainer();

var webApiResolver = new AutofacWebApiDependencyResolver(container);
            GlobalConfiguration.Configuration.DependencyResolver = webApiResolver;

return container;
 }
</code></pre>有人可以发现我在这里缺少的东西吗？谢谢