Ninject - Error loading Ninject component ICache - asp.net-mvc

Question

I am new to Dependency Injection and currently using Ninject as my DI. I have been playing with a ASP.Net MVC 5 application and have been reading "Pro ASP.NET MVC 5". I have followed the examples in the book on how to set up and use Ninject. Below is the code for my register services:
private static void RegisterServices(IKernel kernel)
{
kernel.Bind<ICustomerRepository>().To<CustomerRepository>();
kernel.Bind<ICustomerUserDataRepository>().To<CustomerUserDataRepository>();
}
As for my controller I have below:
public class CustomerController : Controller
{
private ICustomerRepository customerRepository;
public CustomerController(ICustomerRepository customerRepo)
{
this.customerRepository = customerRepo;
}
// GET: Customer
public ActionResult Index(int Id = 0)
{
Customer customer = customerRepository.GetCustomer(Id).First();
return View(customer);
}
}
This works fine as expected in the book. However, I have been playing around with some other code and wanted to further use Ninject to resolve some dependencies. For example, I am working on a custom helper for one of my Razor views. In the my helper code I have the following:
using (IKernel kernel = new StandardKernel())
{
ICustomerUserDataRepository customerUserDataRepo = kernel.Get<ICustomerUserDataRepository>();
When I run this, it complains that there is no binding defined for ICustomerUserDataRepository. I am assuming this is because I am using a new kernel with no defined bindings. I read that you need to load bindings in kernels through modules. So I made the following:
public class MyBindings : NinjectModule
{
public override void Load()
{
Bind<ICustomerUserDataRepository>().To<CustomerUserDataRepository>();
}
}
I then load the module when setting my kernel below:
using (IKernel kernel = new StandardKernel(new MyBindings()))
{
ICustomerUserDataRepository customerUserDataRepo = kernel.Get<ICustomerUserDataRepository>();
This however causes a "Error loading Ninject component ICache" error message when I execute the application. I would appreciate some help on what I am doing wrong and what I am not understanding. I read that multiple defined kernels can cause this error. Am I not suppose to be using a new kernel in my helper method since one is already being used and binded under RegisterServices()? If so, am I suppose to access that existing kernel in my helper method? Or am I on the right track and need a new kernel loading the specific bindings in my module? Thank you.

Answer 1

Am I not suppose to be using a new kernel in my helper method since one is already being used and binded under RegisterServices()?
correct. you only want one kernel or Composition Root per application. I would suggest that instead of trying to access dependencies in a helper method, that you would create a viewmodel in your Controller (that has access to the dependency) and then pass the viewmodel into your helper method.