Ninject问题MVC3用RavenDB会话结合常数 [英] Ninject problem binding to constant value in MVC3 with a RavenDB session

问题描述

我已经看到了很多与ASP.NET MVC配置Ninject不同的方式，但执行似乎与MVC框架的每个版本略有变化。我试图注入RavenDB会话进入我的仓库。以下是我有这几乎工作。

I've seen a lot of different ways of configuring Ninject with ASP.NET MVC, but the implementation seems to change slightly with each release of the MVC framework. I'm trying to inject a RavenDB session into my repository. Here is what I have that's almost working.

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);
    }
}

当它试图解决IDocumentSession，我碰到下面的错误。

When it tries to resolve IDocumentSession, I get the following error.

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

这是如何使IDocumentSession决心？任何想法

Any ideas on how to make the IDocumentSession resolve?

推荐答案

ToConstant（MvcApplication.CurrentSession）在应用程序启动评估。你想要的是延迟评估 ToMethod（CTX =＆GT; MvcApplication.CurrentSession）

ToConstant(MvcApplication.CurrentSession) is evaluated at application start. What you want is delayed evaluation ToMethod(ctx => MvcApplication.CurrentSession)

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