Antes de configurar a pergunta, você deve saber que recebi meu código atual desta página:http://www.strathweb.com/2012/05/using-ninject-with-the-latest-asp-net-web-api-source/

Eu estou tentando usar o ASP.NET Web API e Ninject no meu aplicativo usando um adaptador IDependencyResolver encontrado no site acima.

Eu criei todo o código como ele mostra no site e funciona, mas quando eu carrego meu appication meus controladores regulares falham e mostram este erro:

[MissingMethodException: No parameterless constructor defined for this object.]
[InvalidOperationException: An error occurred when trying to create a controller of type 'AccountManager.Controllers.HomeController'...

Então, parece que eu posso usar Ninject com controladores regulares ou controladores de API da Web, mas não ambos. :(

Aqui está o meu código:

NinjectResolver.cs

public class NinjectResolver : NinjectScope, IDependencyResolver
{
    private IKernel _kernel;

    public NinjectResolver(IKernel kernel)
        : base(kernel)
    {
        _kernel = kernel;
    }

    public IDependencyScope BeginScope()
    {
        return new NinjectScope(_kernel.BeginBlock());
    }
}

NinjectScope.cs

public class NinjectScope : IDependencyScope
{
    protected IResolutionRoot resolutionRoot;

    public NinjectScope(IResolutionRoot kernel)
    {
        resolutionRoot = kernel;
    }

    public object GetService(Type serviceType)
    {
        IRequest request = resolutionRoot.CreateRequest(serviceType, null, new Parameter[0], true, true);
        return resolutionRoot.Resolve(request).SingleOrDefault();
    }

    public IEnumerable<object> GetServices(Type serviceType)
    {
        IRequest request = resolutionRoot.CreateRequest(serviceType, null, new Parameter[0], true, true);
        return resolutionRoot.Resolve(request).ToList();
    }

    public void Dispose()
    {
        IDisposable disposable = (IDisposable)resolutionRoot;
        if (disposable != null) disposable.Dispose();
        resolutionRoot = null;
    }
}

Global.asax.cs

public class MvcApplication : System.Web.HttpApplication
{
    private void SetupDependencyInjection()
    {
        //create Ninject DI Kernel
        IKernel kernel = new StandardKernel();

        //register services with Ninject DI container
        RegisterServices(kernel);

        //tell asp.net mvc to use our Ninject DI Container
        GlobalConfiguration.Configuration.DependencyResolver = new NinjectResolver(kernel);
    }
}

AccountingController.cs

public class AccountingController : ApiController
{
    private ICustomerService _customerService;

    public AccountingController(ICustomerService service)
    {
        _customerService = service;
    }

    // GET /api/<controller>/5
    public string Get(int id)
    {
        return "value";
    }
}