如何在ASP.NET中使用Autofac MVC 4注入HttpContextBase [英] How to inject HttpContextBase using Autofac in ASP.NET MVC 4

问题描述

我使用 ASP.MVC 4 和 Autofac 。

我已经注册在我的的global.asax.cs 文件以下内容：

I have registered the following in my global.asax.cs file:

ContainerBuilder builder = new ContainerBuilder();

builder.Register(c => c.Resolve<HttpContextBase>().Request)
     .As<HttpRequestBase>()
     .InstancePerHttpRequest();
builder.Register(c => c.Resolve<HttpContextBase>().Response)
     .As<HttpResponseBase>()
     .InstancePerHttpRequest();
builder.Register(c => c.Resolve<HttpContextBase>().Server)
     .As<HttpServerUtilityBase>()
     .InstancePerHttpRequest();
builder.Register(c => c.Resolve<HttpContextBase>().Session)
     .As<HttpSessionStateBase>()
     .InstancePerHttpRequest();

builder.RegisterControllers(Assembly.GetExecutingAssembly());

builder.RegisterType<WebWorkContext>().As<IWorkContext>().InstancePerHttpRequest();

在我家的控制器我有这个（只是用于测试）：

In my Home controller I have this (just for testing purposes):

private readonly HttpContextBase httpContext;

public HomeController(HttpContextBase httpContext)
{
     this.httpContext = httpContext;
}

我用完全相同的code与ASP.NET MVC 3项目，它工作得很好。现在，在这个项目中我得到的错误。不知道为什么？那我得到的错误是：

I used the exact same code with an ASP.NET MVC 3 project and it worked fine. Now in this project I am getting errors. Not sure why? The error that I am getting is:

与类型'MyProject.Web.Controllers.HomeController'Autofac.Core.Activators.Reflection.DefaultConstructorFinder'发现的建设者都不能在可用的服务和参数调用：无法解析参数'系统。 Web.HttpContextBase HttpContext的虚空.ctor（System.Web.HttpContextBase）''构造。在Autofac.Core.Activators.Reflection.ReflectionActivator.ActivateInstance在Autofac.Core.Resolving.InstanceLookup.Activate（IEnumerable的 1参数）在Autofac（IComponentContext背景下，IEnumerable的 1参数） .Core.Resolving.InstanceLookup.Execute（）在Autofac.Core.Resolving.ResolveOperation.GetOrCreateInstance（ISharingLifetimeScope currentOperationScope，IComponentRegistration登记的IEnumerable 1参数）在Autofac.Core.Resolving.InstanceLookup.ResolveComponent（IComponentRegistration注册，IEnumerable的 1参数）在Autofac.Core.Registration.ExternalRegistrySource＆LT;

None of the constructors found with 'Autofac.Core.Activators.Reflection.DefaultConstructorFinder' on type 'MyProject.Web.Controllers.HomeController' can be invoked with the available services and parameters: Cannot resolve parameter 'System.Web.HttpContextBase httpContext' of constructor 'Void .ctor(System.Web.HttpContextBase)'. at Autofac.Core.Activators.Reflection.ReflectionActivator.ActivateInstance(IComponentContext context, IEnumerable1 parameters) at Autofac.Core.Resolving.InstanceLookup.Activate(IEnumerable1 parameters) at Autofac.Core.Resolving.InstanceLookup.Execute() at Autofac.Core.Resolving.ResolveOperation.GetOrCreateInstance(ISharingLifetimeScope currentOperationScope, IComponentRegistration registration, IEnumerable1 parameters) at Autofac.Core.Resolving.InstanceLookup.ResolveComponent(IComponentRegistration registration, IEnumerable1 parameters) at Autofac.Core.Registration.ExternalRegistrySource.<

我也不太清楚为什么这是不行的？我是否需要在ASP.NET 4做不同的事情呢？

I'm not too sure why this won't work? Do I need to do things differently in ASP.NET 4?

我有一个单独的项目中，我也想注入 HttpContextBase ，我得到同样的错误。

I have a separate project in which I also want to inject HttpContextBase and I am getting the same error.

推荐答案

感谢 nemesv 。

我最终取代：

builder.Register(c => c.Resolve<HttpContextBase>().Request)
     .As<HttpRequestBase>()
     .InstancePerHttpRequest();
builder.Register(c => c.Resolve<HttpContextBase>().Response)
     .As<HttpResponseBase>()
     .InstancePerHttpRequest();
builder.Register(c => c.Resolve<HttpContextBase>().Server)
     .As<HttpServerUtilityBase>()
     .InstancePerHttpRequest();
builder.Register(c => c.Resolve<HttpContextBase>().Session)
     .As<HttpSessionStateBase>()
     .InstancePerHttpRequest();

...还有：

builder.RegisterModule(new AutofacWebTypesModule());

现在的工作。不知道什么区别不过是模块中的code长得一模一样的矿井上方。

It works now. Not sure what the difference is but the code in the module looks exactly the same as mine above.

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