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copied!<p>As far as I understand, the <strong>PerWebRequestLifestyle</strong> requires an <a href="http://msdn.microsoft.com/en-us/library/System.Web.IHttpModule%28v=vs.110%29.aspx" rel="nofollow">IHttpModule</a> so that it can piggy-back off the <a href="http://msdn.microsoft.com/en-us/library/system.web.ihttpmodule.init%28v=vs.110%29.aspx" rel="nofollow">init method</a> and the <a href="http://msdn.microsoft.com/en-us/library/system.web.httpapplication_events%28v=vs.110%29.aspx" rel="nofollow">HttpApplication events</a> such as <code>BeginRequest</code>.</p> <p>The reason why everything seems to be working is because the module has been initialised and so the PerWebRequestLifestyle is functioning normally.</p> <p>But why is that the case if you didn't include the registration module? <strong>I suspect that it is a legacy instruction and that the container will attempt a registration on its own</strong>, but this isn't documented explicitly.</p> <p>If we take a peek inside CastleWindsor we find something called <code>Castle.MicroKernel.Lifestyle.PerWebRequestLifestyleModuleRegistration</code>. It has this method:</p> <pre><code>public static void Run() { Type type = Type.GetType("Microsoft.Web.Infrastructure.DynamicModuleHelper.DynamicModuleUtility, Microsoft.Web.Infrastructure, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35", false); if (type == null) { return; } MethodInfo method = type.GetMethod("RegisterModule", BindingFlags.Static | BindingFlags.Public); if (method == null) { return; } object[] objArray = new object[] { typeof(PerWebRequestLifestyleModule) }; method.Invoke(null, objArray); } </code></pre> <p>What is <code>DynamicModuleUtility</code>? A quick search reveals a page written by <a href="http://odetocode.com/about/scott-allen" rel="nofollow">K. Scott Allen</a> called <a href="http://odetocode.com/blogs/scott/archive/2011/02/28/dynamicmoduleutility.aspx" rel="nofollow">DynamicModuleUtility</a>.</p> <blockquote> <p>The DynamicModuleUtility will let you install an HTTP module into the ASP.NET pipeline without making any changes to web.config file.</p> </blockquote> <p>This is only my speculation as to what's going on. You'd have to ask the creators of Castle Windsor for details on exactly how things are working.</p>

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