Ninject + “Error loading Ninject component ICache”

Question

I\'ve just installed the new Ninject.MVC3 from NuGet and trying to make it work in my asp.net mvc 3 app, however I get this weird error now and then when surfing my site:

Answer 1

Looks like its a bug according to this thread, and that they are working on a fix...

Answer 2

Fixed in 2.2.1.0

See http://www.planetgeek.ch/2011/03/01/ninject-2-2-1-0-and-ninject-mvc3-2-2-1-0-released/ for more information.

Answer 3

Like previously mentioned it does look like a bug.
One option is to simply implement a singleton extension method yourself:

public static class NinjectSingletonExtension
{
    public static CustomSingletonKernelModel<T> SingletonBind<T>(this IKernel i_KernelInstance)
    {
        return new CustomSingletonKernelModel<T>(i_KernelInstance);
    }
}

public class CustomSingletonKernelModel<T>
{
    private const string k_ConstantInjectionName = "Implementation";
    private readonly IKernel _kernel;
    private static object padlock = new Object();

    private T _concreteInstance;


    public CustomSingletonKernelModel(IKernel i_KernelInstance)
    {
        this._kernel = i_KernelInstance;
    }

    public IBindingInNamedWithOrOnSyntax<T> To<TImplement>(TImplement i_Constant = null) where TImplement : class, T
    {
        _kernel.Bind<T>().To<TImplement>().Named(k_ConstantInjectionName);
        var toReturn =
            _kernel.Bind<T>().ToMethod(x =>
                                       {
                                           if (i_Constant != null)
                                           {
                                               return i_Constant;
                                           }

                                           if (_concreteInstance == null)
                                           {
                                               lock (padlock)
                                               {
                                                   if (_concreteInstance == null)
                                                   {
                                                       _concreteInstance = _kernel.Get<T>(k_ConstantInjectionName);
                                                   }
                                               }
                                           }


                                           return _concreteInstance;
                                       }).When(x => true);

        return toReturn;
    }
}

And then simply use:

i_Kernel.SingletonBind<T>().To<TImplement>();

Rather then

i_Kernel.Bind<T>().To<TImplement>().InSingletonScope();