How to use Ninject bootstrapper in WebApi OwinHost Startup?

Question

I am migrating from IIS WebAPI to OwinHost. Utilizing the latest pre-release versions of nuget packages, I successfully used instructions here:

https://github.com/ninje

Answer 1

Create the kernel manually and then make UseNinjectMiddleware use the same one instead of creating another.

public void Configuration(IAppBuilder app)
{
  var kernel = CreateKernel()

  var config = new HttpConfiguration();
  config.MapHttpAttributeRoutes();

  // USE kernel here

  app.UseNinjectMiddleware(() => kernel);
  app.UseNinjectWebApi(config);
}

Answer 2

In addition to Olif's post:

1. install-package ninject.extensions.conventions

2. In your startup class add: using Ninject.Extensions.Conventions;

3. Instead of manually binding:

 public static IKernel CreateKernel()
     {
         var kernel = new StandardKernel();
         //Create the bindings
         kernel.Bind<IProductsRepository>().To ProductRepository ();
         return kernel;
     }

You can now do:

kernel.Bind(x =>
                {
                    x.FromThisAssembly()
                    .SelectAllClasses()
                    .BindDefaultInterface();
                });

This will look through your assembly, and do the binding automatically.

Answer 3

Add the following nuget-packages to your application:

1. Install-Package Microsoft.AspNet.WebApi.Owin
2. Install-Package Ninject

If you are using web api version 5.0.0.0 you also need to download the Ninject Resolver class from the repo to avoid compatability issues.

Create a static method that returns a Kernel object

public static class NinjectConfig
{
    public static IKernel CreateKernel()
    {
        var kernel = new StandardKernel();
        //Create the bindings
        kernel.Bind<IProductsRepository>().To<ProductRepository>();
        return kernel;
    }
}

Then you can use ninject in your startup class

public class Startup
{
    public void Configuration(IAppBuilder app)
    {
        var config = new HttpConfiguration();
        config.DependencyResolver = new NinjectResolver(NinjectConfig.CreateKernel());

        config.Routes.MapHttpRoute("default", "api/{controller}/{id}", new { id=RouteParameter.Optional });

        app.UseWebApi(config);
    }
}