注入的WebAPI UrlHelper到使用Autofac服务 [英] Inject WebAPI UrlHelper into service using Autofac

问题描述

我在我的WebAPI项目中使用由几个控制器的服务。该服务需要生成URL，因此最好是将通过构造函数的参数获得 UrlHelper 。

I have a service used by a few controllers in my WebAPI project. The service needs to generate URLs, so ideally it would get a UrlHelper via a constructor parameter.

public class MyService
{
    public MyService(UrlHelper urlHelper) { ... }
}

我使用Autofac作为我IoC容器。我怎样才能在容器中注册 UrlHelper ？它需要一个的Htt prequestMessage ，我无法弄清楚如何获得当前的消息。

I'm using Autofac as my IoC container. How can I register UrlHelper in the container? It needs a HttpRequestMessage and I can't figure out how to get the "current" message.

推荐答案

使用 RegisterHtt prequestMessage 方法注册当前请求，那么你也可以注册登记网址帮手，像这样：

Use the RegisterHttpRequestMessage method to register the current request and then you can register also register the URL helper like so:

public static IContainer SetupContainer(HttpConfiguration config)
{
    var containerBuilder = new ContainerBuilder();

    // Register your Web API.
    containerBuilder.RegisterApiControllers(Assembly.GetExecutingAssembly());
    containerBuilder.RegisterHttpRequestMessage(config);
    containerBuilder.Register(x => new UrlHelper(x.Resolve<HttpRequestMessage>()));  
    containerBuilder.RegisterWebApiFilterProvider(config);
    containerBuilder.RegisterWebApiModelBinderProvider();

    // Register your other types...

    var container = containerBuilder.Build();

    // Set the dependency resolver to be Autofac.
    config.DependencyResolver = new AutofacWebApiDependencyResolver(container);

    return container;
}

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