asp.net-mvc-4 - HttpContextBase 是如何向 ninject 注册的？我没有明确绑定它

Question

我在我的 NinjectWebCommon.RegisterServices 方法中为 HttpContextBase 创建了一个绑定，但是当我尝试在我的控制器或服务中引用它时，我收到一条错误消息。

这是绑定：

kernel.Bind<HttpContextBase>().ToMethod(context => new HttpContextWrapper(HttpContext.Current)).InRequestScope();

这是错误消息：

Error activating HttpContextBase
More than one matching bindings are available.
Activation path:
 2) Injection of dependency HttpContextBase into parameter abase of constructor of type HomeController
 1) Request for HomeController

Suggestions:
 1) Ensure that you have defined a binding for HttpContextBase only once.

如果我删除绑定，那么它似乎做了我想要的（解析为 HttpContextWrapper），但我想知道它是如何注册的？

Answer 1

但我想知道这是如何注册的？

查看源代码，MvcModule.cs您的问题将立即得到解答：

this.Kernel.Bind<HttpContext>().ToMethod(ctx => HttpContext.Current).InTransientScope();
this.Kernel.Bind<HttpContextBase>().ToMethod(ctx => new HttpContextWrapper(HttpContext.Current)).InTransientScope();

Answer 2

我看到 Ninject.Web.Common v3.2.3.0 注册的绑定

如果您尝试在单元测试中模拟绑定，则必须先将其删除，如下所示：

// WebCommonNinjectModule loads HttpContextBase. We need to remove it
var httpContextBaseBinding = kernel.GetBindings(typeof(System.Web.HttpContextBase)).FirstOrDefault();
kernel.RemoveBinding(httpContextBaseBinding);
kernel.Bind<System.Web.HttpContextBase>().ToMethod(m => httpContextBaseMock.Object);