public static IAppBuilder UseAutofacMiddleware(this IAppBuilder app, ILifetimeScope container)        {            if (app == null)            {                throw new ArgumentNullException("app");            }            if (container == null)            {                throw new ArgumentNullException("container");            }            return app                .RegisterAutofacLifetimeScopeInjector(container)                .UseAllMiddlewareRegisteredInContainer(container);        }

private static IAppBuilder RegisterAutofacLifetimeScopeInjector(this IAppBuilder app, ILifetimeScope container)        {            app.Use(async (context, next) =>                {                    using (var lifetimeScope = container.BeginLifetimeScope(MatchingScopeLifetimeTags.RequestLifetimeScopeTag,                    b => b.RegisterInstance(context).As
     
      ()))                    {                        context.Set(Constants.OwinLifetimeScopeKey, lifetimeScope);                        await next();                    }                });            app.Properties[InjectorRegisteredKey] = true;            return app;        }
     

 

using System;using Microsoft.Owin;namespace Autofac.Integration.Owin{    /// 
    /// Extension methods for using Autofac within an OWIN context.    /// 
    public static class OwinContextExtensions    {        /// 
        /// Gets the current Autofac lifetime scope from the OWIN context.        /// 
        /// The OWIN context.        /// 
     
      The current lifetime scope.
             /// 
     
              /// Thrown if 
       is 
      .        /// 
             public static ILifetimeScope GetAutofacLifetimeScope(this IOwinContext context)        {            if (context == null)            {                throw new ArgumentNullException("context");            }            return context.Get
     
      (Constants.OwinLifetimeScopeKey);        }    }}