在Ninject 2中注入HttpContext [英] Injecting HttpContext in Ninject 2

问题描述

在我的asp.net mvc应用程序中，我使用Ninject作为DI框架.

In my asp.net mvc application I'm using Ninject as a DI framework.

我的控制器使用我的HttpAccountService从cookie中获取信息. 为此，我需要HttpAccountService中的HttpContext.Current. 因为这是一个依赖关系，所以我将它通过构造函数注入了它:

My HttpAccountService is used by my controllers to get info from and to cookies. For this I need the HttpContext.Current in the HttpAccountService. As this is a dependency I injected it throught the constructor as such:

kernel.Bind<IAccountService>()
    .To<HttpAccountService>()
    .InRequestScope()
    .WithConstructorArgument("context", HttpContext.Current);

可悲的是，它始终绑定到相同的上下文，这使得在第一个请求完成之后，该上下文变得过时了.

Sadly this always binds to the same context which makes that after the first request finishes this context becomes outdated.

我应该如何正确注入HttpContext?

How should I correctly inject my HttpContext?

推荐答案

WithConstructorArgument具有需要Func<NinjectContext,T>的重载，即，您可以使用:

WithConstructorArgument has an overload that takes a Func<NinjectContext,T>, i.e., you can use:

... .WithConstructorArgument("context", ninjectContext => HttpContext.Current);

它将在请求处理中调用提供的回调" lambda，并在该时间点获得正确的值(与您调用另一个重载并提供在Bind<>时计算得出的常数值相反).

which will call the provided 'callback' lambda within the request processing and obtain the correct value at that point in time [as opposed to you calling the other overload and supplying a constant value which gets computed at Bind<> time].

(如果您不打算模拟上下文，我认为您会考虑内联使用它)

(If you're not trying to Mock the context, I assume you'll consider using it inline)

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