你如何使用AutoFac和OWIN进行依赖注入？

Question

这适用于MVC5和新管道.我无法在任何地方找到一个好的例子.

public static void ConfigureIoc(IAppBuilder app)
{
    var builder = new ContainerBuilder();
    builder.RegisterControllers(typeof(WebApiApplication).Assembly);
    builder.RegisterApiControllers(typeof(WebApiApplication).Assembly);
    builder.RegisterType<SecurityService().AsImplementedInterfaces().InstancePerApiRequest().InstancePerHttpRequest();

    var container = builder.Build();
    app.UseAutofacContainer(container);
}

上面的代码没有注入.在尝试切换到OWIN管道之前,这很好用.在OWIN上找不到关于DI的任何信息.

Answer 1

更新:有一个官方的Autofac OWIN nuget包和一个包含一些文档的页面.

原文:
有,解决了国际奥委会和OWIN集成称为问题项目DotNetDoodle.Owin.Dependencies可通过的NuGet.基本上Owin.Dependencies是进入OWIN管道的IoC容器适配器.

示例启动代码如下所示:

public class Startup
{
    public void Configuration(IAppBuilder app)
    {
        IContainer container = RegisterServices();
        HttpConfiguration config = new HttpConfiguration();
        config.Routes.MapHttpRoute("DefaultHttpRoute", "api/{controller}");

        app.UseAutofacContainer(container)
           .Use<RandomTextMiddleware>()
           .UseWebApiWithContainer(config);
    }

    public IContainer RegisterServices()
    {
        ContainerBuilder builder = new ContainerBuilder();

        builder.RegisterApiControllers(Assembly.GetExecutingAssembly());
        builder.RegisterOwinApplicationContainer();

        builder.RegisterType<Repository>()
               .As<IRepository>()
               .InstancePerLifetimeScope();

        return builder.Build();
    }
}

哪里RandomTextMiddleware是实现OwinMiddleware从Microsoft.Owin类.

"在OwinMiddleware类的Invoke方法将在每个请求被调用,我们可以决定,判决是否处理请求,将请求传递给下一个中间件或者做两个.invoke方法得到一个IOwinContext实例,我们可以得到的通过IOwinContext实例的每请求依赖范围."

示例代码RandomTextMiddleware如下:

public class RandomTextMiddleware : OwinMiddleware
{
    public RandomTextMiddleware(OwinMiddleware next)
        : base(next)
    {
    }

    public override async Task Invoke(IOwinContext context)
    {
        IServiceProvider requestContainer = context.Environment.GetRequestContainer();
        IRepository repository = requestContainer.GetService(typeof(IRepository)) as IRepository;

        if (context.Request.Path == "/random")
        {
            await context.Response.WriteAsync(repository.GetRandomText());
        }
        else
        {
            context.Response.Headers.Add("X-Random-Sentence", new[] { repository.GetRandomText() });
            await Next.Invoke(context);
        }
    }
}

有关更多信息,请查看原始文章.