SignalR 2.0使用Ninject注入接口

我有以下简单的Hub类来列出使用注入用户服务的用户.使用NinjectSignalRDependencyResolver的启动类.非常简单的客户端脚本.

毂

[HubName("dashboardHub")]
public class DashboardHub : Hub
{
    private readonly IUserService _users;

    public DashboardHub(IUserService users)
    {
        _users = users;
    }

    public void Initialize()
    {
        var users = _users.ListUsers();

        Clients.All.UpdateStatus(users);
    }
}

startup.cs

  var kernel = new StandardKernel();
  var resolver = new NinjectSignalRDependencyResolver(kernel);

  var config = new HubConfiguration()
  {
        Resolver = resolver,
  };

  app.MapSignalR(config);

NinjectSignalRDependencyResolver

public class NinjectSignalRDependencyResolver : DefaultDependencyResolver
{
    private readonly IKernel _kernel;

    public NinjectSignalRDependencyResolver(IKernel kernel)
    {
        _kernel = kernel;
    }

    public override object GetService(Type serviceType)
    {
        return _kernel.TryGet(serviceType) ?? base.GetService(serviceType);
    }

    public override IEnumerable