WindsorControllerActivator.cs

using Castle.MicroKernel.Lifestyle;
using Castle.Windsor;
using System;
using System.Net.Http;
using System.Web.Http.Controllers;
using System.Web.Http.Dispatcher;
using Library.Api.Web;

namespace Library.Api.Windsor
{
    public class WindsorControllerActivator : IHttpControllerActivator
    {
        private readonly IWindsorContainer container;

        public WindsorControllerActivator(IWindsorContainer container)
        {
            this.container = container;
        }

        public IHttpController Create(
            HttpRequestMessage request,
            HttpControllerDescriptor controllerDescriptor,
            Type controllerType)
        {
            var scope = container.BeginScope();
            SetHttpRequestMessage(request);

            var controller = (IHttpController) container.Resolve(controllerType);
            request.RegisterForDispose(new Release(scope, () => container.Release(controller)));

            return controller;
        }

        private void SetHttpRequestMessage(HttpRequestMessage request)
        {
            var context = container.Resolve<OwinContextProvider>();
            context.Current = request.GetOwinContext();
        }

        private class Release : IDisposable
        {
            private readonly IDisposable scope;
            private readonly Action release;

            public Release(IDisposable scope, Action release)
            {
                this.scope = scope;
                this.release = release;
            }

            public void Dispose()
            {
                scope.Dispose();
                release();
            }
        }
    }
}