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POVirtualPathProvider doesn't (quite) work in production on IIS 7.5
 

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    <p>I have been working on a project that has common bits of functionality, specifically I wanted to share the master file and related images/js/etc. To that end, the master page and its dependent files are all wrapped into a "global" DLL that is utilized by all "subprojects". This all worked great in development, but deployment yielded a surprise which seems to catch a lot of people off guard: <code>VirtualPathProvider</code> doesn't work when precompiled. </p> <p>Now thanks to <a href="http://sunali.com/2008/01/09/virtualpathprovider-in-precompiled-web-sites/" rel="nofollow">this blog post containing a workaround</a> I was able to give another attempt at getting it to work. Regretfully, it still doesn't.</p> <p>I opted to get rid of my <code>Global.asax</code> implementation and went with the blog post's <code>AppInitialize</code> approach:</p> <pre><code>public static class AppStart { public static void AppInitialize() { HostingEnvironment hostingEnvironmentInstance = (HostingEnvironment)typeof(HostingEnvironment).InvokeMember("_theHostingEnvironment", BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.GetField, null, null, null); MethodInfo mi = typeof(HostingEnvironment).GetMethod("RegisterVirtualPathProviderInternal", BindingFlags.NonPublic | BindingFlags.Static); mi.Invoke(hostingEnvironmentInstance, new object[] { new MasterPageProvider() }); } } </code></pre> <p>Since the actual provider works in debug, I won't include it. If you would like to see it, don't hesitate to ask. Just wanted to keep the question as short as possible.</p> <p>The interesting aspect to this whole situation is that production yields no errors about not being able to find the master page. To me, this means the provider <em>is</em> working, but for whatever reason the rest of the resources (js/css/etc) aren't being retrieved from the assembly properly.</p> <p>So my question comes down to this: what are the reasons that this solution would work great in development, but not in production on IIS 7.5?</p> <hr> <p><strong>UPDATE 11/20/2011</strong></p> <p>Tried out David Ebbo's suggestion and had no results unfortunately. My web config looks something like this now:</p> <pre><code>&lt;configuration&gt; &lt;connectionStrings&gt; &lt;clear /&gt; &lt;!-- ... --&gt; &lt;/connectionStrings&gt; &lt;system.web&gt; &lt;pages&gt; &lt;controls&gt; &lt;!-- ... --&gt; &lt;/controls&gt; &lt;/pages&gt; &lt;compilation debug="true" targetFramework="4.0" /&gt; &lt;webServices&gt; &lt;protocols&gt; &lt;add name="HttpGet"/&gt; &lt;add name="HttpPost"/&gt; &lt;/protocols&gt; &lt;/webServices&gt; &lt;/system.web&gt; &lt;system.webServer&gt; &lt;modules runAllManagedModulesForAllRequests="true" /&gt; &lt;/system.webServer&gt; &lt;/configuration&gt; </code></pre> <hr> <p><strong>UPDATE 11/21/2011</strong></p> <p>Just to verify my suspicion that the VirtualPathProvider was actually working, I commented out the third line (<code>mi.Invoke(....</code>) and redeployed the site. As I suspected, it now breaks due to not being able to find the MasterPage file. This issue appears to be related to only static files being delivered through the VPP.</p>
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