Ninject, WebAPI 2 Dependency injection not working - dependency-injection

Question

I am trying to integrate Ninject in my WebAPI 2 project but I am getting following error:
{
"message": "An error has occurred.",
"exceptionMessage": "An error occurred when trying to create a controller of type 'BrandController'. Make sure that the controller has a parameterless public constructor.",
"exceptionType": "System.InvalidOperationException",
"stackTrace": " at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType)\r\n at System.Web.Http.Controllers.HttpControllerDescriptor.CreateController(HttpRequestMessage request)\r\n at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext()",
"innerException": {
"message": "An error has occurred.",
"exceptionMessage": "Type 'ADAS.GoTango.WebApi.Controllers.BrandController' does not have a default constructor",
"exceptionType": "System.ArgumentException",
"stackTrace": " at System.Linq.Expressions.Expression.New(Type type)\r\n at System.Web.Http.Internal.TypeActivator.Create[TBase](Type instanceType)\r\n at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.GetInstanceOrActivator(HttpRequestMessage request, Type controllerType, Func`1& activator)\r\n at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType)"
}
}
My package config is:
<package id="Ninject" version="3.2.2.0" targetFramework="net45" />
<package id="Ninject.Web.Common" version="3.2.3.0" targetFramework="net45" />
<package id="Ninject.Web.Common.WebHost" version="3.2.3.0" targetFramework="net45" />
<package id="Ninject.Web.WebApi" version="3.2.4.0" targetFramework="net45" />
<package id="Ninject.Web.WebApi.WebHost" version="3.2.4.0" targetFramework="net45" />
<package id="Ninject.WebApi.DependencyResolver" version="0.1.4758.24814" targetFramework="net45" />
My code :
public class BrandController : BaseApiController
{
readonly BrandsBusiness _brandsBusiness;
public BrandController(BrandsBusiness brandsBusiness)
{
_brandsBusiness = brandsBusiness;
}
//public BrandController()
//{
// _brandsBusiness = new BrandsBusiness(new BrandEfStore());
//}
public IHttpActionResult Get()
{
try
{
var allActiveBrands = _brandsBusiness.GetAllActiveBrands();
return Ok(allActiveBrands);
}
catch (Exception exception)
{
Logger.Error(exception);
return InternalServerError();
}
}
}
and NinjectWebCommon.cs file is
/// <summary>
/// Creates the kernel that will manage your application.
/// </summary>
/// <returns>The created kernel.</returns>
private static IKernel CreateKernel()
{
var kernel = new StandardKernel();
try
{
kernel.Bind<Func<IKernel>>().ToMethod(ctx => () => new Bootstrapper().Kernel);
kernel.Bind<IHttpModule>().To<HttpApplicationInitializationHttpModule>();
GlobalConfiguration.Configuration.DependencyResolver = new NinjectDependencyResolver(kernel);
RegisterServices(kernel);
return kernel;
}
catch
{
kernel.Dispose();
throw;
}
}
/// <summary>
/// Load your modules or register your services here!
/// </summary>
/// <param name="kernel">The kernel.</param>
private static void RegisterServices(IKernel kernel)
{
var configuration = new HttpConfiguration();
kernel.Bind<DefaultModelValidatorProviders>().ToConstant(new DefaultModelValidatorProviders(configuration.Services.GetServices(typeof(ModelValidatorProvider)).Cast<ModelValidatorProvider>()));
kernel.Bind<BrandsBusiness>().ToSelf().InRequestScope();
kernel.Bind<IBrandManagement>().To<BrandEfStore>().InRequestScope();
}
I have alredy tried :
Parameterless constructor error with Ninject bindings in .NET Web Api 2.1
Ninject.ActivationException thrown only on first web request (WebAPI 2, OWIN 3, Ninject 3)
but none of them worked.

Answer 1

While I don't know Ninject, I'd imagine that you'll need to make sure that the CreateKernel method is called. You'd normally add an Application_Start method in your global.asax.
You may need to make the CreateKernel method internal or public in order to be able to call if from there.