Ninject.Web.PageBase still resulting in null reference to injected dependency

Posted by Ted on Stack Overflow See other posts from Stack Overflow or by Ted
Published on 2010-03-01T18:41:10Z Indexed on 2010/03/17 20:41 UTC
Read the original article Hit count: 583

Filed under:
|
|

I have an ASP.NET 3.5 WebForms application using Ninject 2.0. However, attempting to use the Ninject.Web extension to provide injection into System.Web.UI.Page, I'm getting a null reference to my injected dependency even though if I switch to using a service locator to provide the reference (using Ninject), there's no issue.

My configuration (dumbed down for simplicity):

public partial class Default : PageBase // which is Ninject.Web.PageBase
{
    [Inject]
    public IClubRepository Repository { get; set; }

    protected void Page_Load(object sender, EventArgs e)
    {
        var something = Repository.GetById(1); // results in null reference exception.
    }
 }

... //global.asax.cs

public class Global : Ninject.Web.NinjectHttpApplication
{
    /// <summary>
    /// Creates a Ninject kernel that will be used to inject objects.
    /// </summary>
    /// <returns>
    /// The created kernel.
    /// </returns>
    protected override IKernel CreateKernel()
    {
        IKernel kernel =
        new StandardKernel(new MyModule());
        return kernel;

    }

..

...

public class MyModule : NinjectModule
{
    public override void Load()
    {
        Bind<IClubRepository>().To<ClubRepository>();
        //...
    }
}

Getting the IClubRepository concrete instance via a service locator works fine (uses same "MyModule"). I.e.

  private readonly IClubRepository _repository = Core.Infrastructure.IoC.TypeResolver.Get<IClubRepository>();

What am I missing?

[Update] Finally got back to this, and it works in Classic Pipeline mode, but not Integrated. Is the classic pipeline a requirement?

[Update 2] Wiring up my OnePerRequestModule was the problem (which had removed in above example for clarity):

    protected override IKernel CreateKernel()
    {
        var module = new OnePerRequestModule();
        module.Init(this);

        IKernel kernel = new StandardKernel(new MyModule());

        return kernel;
    }

...needs to be:

    protected override IKernel CreateKernel()
    {
        IKernel kernel = new StandardKernel(new MyModule());

        var module = new OnePerRequestModule();
        module.Init(this);

        return kernel;
    }

Thus explaining why I was getting a null reference exception under integrated pipeline (to a Ninject injected dependency, or just a page load for a page inheriting from Ninject.Web.PageBase - whatever came first).

© Stack Overflow or respective owner

Related posts about ninject

Related posts about asp.net-webforms