使用RavenDB会话将Ninject问题绑定到MVC3中的常量值

Question

我已经看到了许多使用ASP.NET MVC配置Ninject的不同方法,但是随着MVC框架的每个版本的发布,实现似乎都有所改变.我正在尝试将RavenDB会话注入我的存储库.这就是我所拥有的几乎可以工作的东西.

public class MvcApplication : NinjectHttpApplication
{
    ...

    protected override void OnApplicationStarted()
    {
        base.OnApplicationStarted();

        AreaRegistration.RegisterAllAreas();

        RegisterGlobalFilters(GlobalFilters.Filters);
        RegisterRoutes(RouteTable.Routes);
    }

    protected override IKernel CreateKernel()
    {
        return new StandardKernel(new MyNinjectModule());
    }

    public static IDocumentSession CurrentSession
    {
        get { return (IDocumentSession)HttpContext.Current.Items[RavenSessionKey]; }
    }
    ...
}

public class MyNinjectModule : NinjectModule
{
    public override void Load()
    {
        Bind<IUserRepository>().To<UserRepository>();
        Bind<IDocumentSession>().ToConstant(MvcApplication.CurrentSession);
    }
}

当它尝试解析IDocumentSession时,我收到以下错误.

Error activating IDocumentSession using binding from IDocumentSession to constant value
Provider returned null.
Activation path:
  3) Injection of dependency IDocumentSession into parameter documentSession of constructor of type UserRepository

有关如何解决IDocumentSession的任何想法？

Answer 1

ToConstant(MvcApplication.CurrentSession)在申请开始时评估.你想要的是延迟评估ToMethod(ctx => MvcApplication.CurrentSession)