依赖注入 HTTPModule

发布于 2024-07-11 23:20:41 字数 843 浏览 9 评论 0原文

Google/MyBrain 让我失望了。如果不使用框架（我永远不会超越我的同事），鉴于您（程序员）无法控制创建实例，如何将依赖项注入到 HTTPModule 中？

我们是否要修改自定义 web.config 部分 + 反射，或者是否有一些我没有看到的更干净的东西？

例如使用 Karl Seguin 的示例模块作为基础，并假设实现了 ILogger。 .Net 2.0 fwiw

public class ErrorModule : IHttpModule
{
    private ILogger injectedLogger; //how to set this?

    public void Init(HttpApplication application)
    {
        application.Error += (new EventHandler(this.application_Error));
    }

    public void Dispose() { /* required by IHttpModule */ }

    private void application_Error(object sender, EventArgs e)
    {
        this.injectedLogger.doStuff(e.ExceptionObject as Exception);
    }
}

正是这样的事情让我意识到我是多么鄙视 MSDN。

原文

Google/MyBrain are failing me. Without using a framework (which I'll never get past my colleagues), how do you inject a dependency into an HTTPModule given that you (the programmer) are not in control of creating the instance?

Are we into hacking up custom web.config sections + reflection or is there something cleaner I'm not seeing?

e.g. using Karl Seguin's example module as a base, and assuming the implementation of an ILogger. .Net 2.0 fwiw

public class ErrorModule : IHttpModule
{
    private ILogger injectedLogger; //how to set this?

    public void Init(HttpApplication application)
    {
        application.Error += (new EventHandler(this.application_Error));
    }

    public void Dispose() { /* required by IHttpModule */ }

    private void application_Error(object sender, EventArgs e)
    {
        this.injectedLogger.doStuff(e.ExceptionObject as Exception);
    }
}

It's things like this make me realise how much I despise MSDN.

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风筝在阴天搁浅。 2024-07-18 23:20:41

我偶然发现了一个程序化的解决方案。完全消除 web.config 引用，如果您小心生命周期，您可以将模块添加到 global.asax 中。

在global.asax中添加：

public static ErrorModule myErrorModule;

public override void Init()
{
    base.Init();
    myErrorModule = new ErrorModule(new LogImplementer());
    myErrorModule.Init(this);
}

其中“LogImplementer”实现了ILogger，只需向httpmodule添加一个构造函数即可：

public ErrorModule(ILogger injected)
{
    this.Logger = injected;
}

有一些健康警告。您必须非常小心在 global.asax 中执行此操作的位置（我很确定 Init() 是正确的，但我不确定）并且该模块不会添加到只读 HttpApplication.Modules 集合中。除此之外，效果很好。

I've stumbled on a programatic solution. Eliminating web.config references entirely, you can add a module into global.asax if you're careful with the life-cycle.

In global.asax add:

public static ErrorModule myErrorModule;

public override void Init()
{
    base.Init();
    myErrorModule = new ErrorModule(new LogImplementer());
    myErrorModule.Init(this);
}

where "LogImplementer" implements ILogger, and just add a constructor to the httpmodule:

public ErrorModule(ILogger injected)
{
    this.Logger = injected;
}

There are some health warnings. You have to be really careful about where you do this int he global.asax (I'm pretty sure that Init() is right, but I'm not certain) and the module isn't added to the readonly HttpApplication.Modules collection. Other than that, works beautifully.

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