autofac-依赖注入到IHttpModule中 [英] autofac - dependency injection into IHttpModule

问题描述

在IIS 7.5上使用autofac 3.0的新MVC 4 Web应用程序.如何将依赖项注入IHttpModule?

New MVC 4 web application using autofac 3.0 on IIS 7.5. How do I inject a dependency into an IHttpModule?

我尝试了构造函数注入，结果是:

I tried constructor injection which resulted in:

找不到类型为'AnonymousIdentityModule'的构造函数

Constructor on type 'AnonymousIdentityModule' not found

因此，似乎内部组件要求HTTP模块使用无参数的构造函数.我也尝试过属性注入，但是实际上没有注入依赖.

So it seems the internals require a parameterless constructor for http modules. I also tried property injection too but that resulted in no dependency actually being injected.

注册

builder.RegisterType<AnonymousIdentityModule>().As<IHttpModule>().PropertiesAutowired().InstancePerHttpRequest();

IHttpModule代码

public class AnonymousIdentityModule : IHttpModule
{
    private readonly IServiceManager _serviceManager;

    // this causes "constructor not found" exception 
    public AnonymousIdentityModule(IServiceManager serviceManager)
    {
        _serviceManager = serviceManager;
    }

    // never assigned by autofac
    public IServiceManager ServiceManager
    {
        get { return _serviceManager; }
        set { _serviceManager = value; }
    }
    ...
}

web.config

  <system.webServer>
    <validation validateIntegratedModeConfiguration="false" />
    <modules>
      <add name="AnonymousIdentityModule" type="AnonymousIdentityModule" />
    </modules>
  </system.webServer>

我发现了这个旧的 文章 与温莎有关，但在autofac中却看不到它.

I found this old article related to Windsor but did not see an equivalent in autofac.

推荐答案

查看以下SO问题:以及Phil Haack的这篇文章:

and this post by Phil Haack: http://haacked.com/archive/2011/06/02/dependency-injection-with-asp-net-httpmodules.aspx

他们俩都在谈论通过创建另一个HttpModule来初始化DI来为HttpModules提供DI.如果需要的话，PH还提供了他的HttpModuleMagic的nuget包:

They both talk about providing DI to HttpModules by creating another HttpModule to initialize them. And PH has provided a nuget package of his HttpModuleMagic if you want it:

PM> Install-Package HttpModuleMagic

但是因为HttpModules仅在它们是一种单例之后才创建，并且您的依赖项也必须是一个单例(或更确切地说，是一个实例).

But because HttpModules are only created once they are a kind of singleton, and your dependency also has to be a singleton (or rather, a single instance).

因此，如果您需要每个请求的依赖项，请查看此帖子:

So, if you need a per-request dependency, check out this post: http://blog.sapiensworks.com/post/2013/03/18/Http-Module-Dependecy-Injection-with-Autofac-Gotcha.aspx

这着眼于在需要时使用Factory函数检索适当范围的依赖项.

This looks at using a Factory function to retrieve a properly scoped dependency when needed.

这篇关于autofac-依赖注入到IHttpModule中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！