title: System.Web.Mvc 5.2.2.0 vs. 5.2.3.0 versioning issue with aspnet_compiler
body: <p>I have problems when turning on compilation of views in Visual Studio. I have a fairly standard ASP.NET MVC 5 application, with a lot of references. I reference System.Web.Mvc 5.2.3.0 (latest as of now), but the compilation seems to have problems with v. 5.2.2.0 vs 5.2.3.0. The excellent tool AsmSpy (<a href="https://github.com/mikehadlow/AsmSpy" rel="noreferrer">https://github.com/mikehadlow/AsmSpy</a>) tells me which assemblies reference which version of System.Web.Mvc:</p>
  
  <pre><code>Reference: System.Web.Mvc
     5.1.0.0 by Autofac.Integration.Mvc
     5.0.0.0 by Glimpse.Mvc5
     5.0.0.0 by Microsoft.Web.Mvc
     3.0.0.0 by Mindscape.Raygun4Net.Mvc
     5.2.3.0 by Myrepo.Web.Common
     5.2.3.0 by MyApp
     5.2.2.0 by Thinktecture.IdentityModel.Owin.ResourceAuthorization.Mvc
  </code></pre>
  
  <p>So, the guilty one is Thinktecture.IdentityModel.Owin.ResourceAuthorization.Mvc. But, I have added an Assembly binding redirect to the root web.config of the app, like this:</p>
  
  <pre><code>  &lt;runtime&gt;
      &lt;assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"&gt;
      &lt;!-- lots more --&gt;
        &lt;dependentAssembly&gt;
          &lt;assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" /&gt;
          &lt;bindingRedirect oldVersion="0.0.0.0-5.2.3.0" newVersion="5.2.3.0" /&gt;
        &lt;/dependentAssembly&gt;
        &lt;!-- lots more --&gt;
      &lt;/assemblyBinding&gt;
    &lt;/runtime&gt;
  </code></pre>
  
  <p>In an effort to try to get to the bottom of the problem, I have turned on Diagnostic build logging, which spits out north of 260,000 lines of log, including:</p>
  
  <pre><code>16&gt;  Unified primary reference "System.Web.Mvc, Version=5.2.3.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35". (TaskId:183)
  16&gt;      Using this version instead of original version "5.1.0.0" in "C:\Users\ErikBrandstadmoen\Source\Repos\myrepo\packages\Autofac.Mvc5.3.3.4\lib\net45\Autofac.Integration.Mvc.dll" because of a binding redirect entry in the file "obj\Debug\MyWeb.csproj.App.config". (TaskId:183)
  16&gt;      Using this version instead of original version "5.0.0.0" in "C:\Users\ErikBrandstadmoen\Source\Repos\myrepo\packages\Glimpse.Mvc5.1.5.3\lib\net45\Glimpse.Mvc5.dll" because of a binding redirect entry in the file "obj\Debug\MyWeb.csproj.App.config". (TaskId:183)
  16&gt;      Using this version instead of original version "3.0.0.0" in "C:\Users\ErikBrandstadmoen\Source\Repos\myrepo\packages\Mindscape.Raygun4Net.Mvc.5.1.0\lib\net40\Mindscape.Raygun4Net.Mvc.dll" because of a binding redirect entry in the file "obj\Debug\MyWeb.csproj.App.config". (TaskId:183)
  16&gt;      Using this version instead of original version "5.2.2.0" in "C:\Users\ErikBrandstadmoen\Source\Repos\myrepo\packages\Thinktecture.IdentityModel.Owin.ResourceAuthorization.Mvc.2.0.0\lib\net45\Thinktecture.IdentityModel.Owin.ResourceAuthorization.Mvc.dll" because of a binding redirect entry in the file "obj\Debug\MyWeb.csproj.App.config". (TaskId:183)
  16&gt;      Using this version instead of original version "5.0.0.0" in "C:\Users\ErikBrandstadmoen\Source\Repos\myrepo\Web\Common\bin\Debug\Microsoft.Web.Mvc.dll" because of a binding redirect entry in the file "obj\Debug\MyWeb.csproj.App.config". (TaskId:183)
  16&gt;      Resolved file path is "C:\Users\ErikBrandstadmoen\Source\Repos\myrepo\packages\Microsoft.AspNet.Mvc.5.2.3\lib\net45\System.Web.Mvc.dll". (TaskId:183)
  16&gt;      Reference found at search path location "{HintPathFromItem}". (TaskId:183)
  16&gt;          For SearchPath "{CandidateAssemblyFiles}". (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.Agent.AttributeFilter.dll", but its name "NewRelic.Agent.AttributeFilter" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.Agent.Configuration.dll", but its name "NewRelic.Agent.Configuration" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.Agent.Core.dll", but its name "NewRelic.Agent.Core" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.Agent.LabelsService.dll", but its name "NewRelic.Agent.LabelsService" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.Agent.LazyMap.dll", but its name "NewRelic.Agent.LazyMap" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.Collections.dll", but its name "NewRelic.Collections" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.Core.dll", but its name "NewRelic.Core" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.Dispatchers.dll", but its name "NewRelic.Dispatchers" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.Memoization.dll", but its name "NewRelic.Memoization" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.Providers.CallStack.AsyncLocal.dll", but its name "NewRelic.Providers.CallStack.AsyncLocal" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.Providers.TransactionContext.Asp.dll", but its name "NewRelic.Providers.TransactionContext.Asp" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.Providers.TransactionContext.Default.dll", but its name "NewRelic.Providers.TransactionContext.Default" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.Providers.TransactionContext.Wcf3.dll", but its name "NewRelic.Providers.TransactionContext.Wcf3" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.Providers.Wrapper.Asp35.dll", but its name "NewRelic.Providers.Wrapper.Asp35" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.Providers.Wrapper.HttpClient.dll", but its name "NewRelic.Providers.Wrapper.HttpClient" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.Providers.Wrapper.MongoDb.dll", but its name "NewRelic.Providers.Wrapper.MongoDb" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.Providers.Wrapper.Mvc3.dll", but its name "NewRelic.Providers.Wrapper.Mvc3" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.Providers.Wrapper.NServiceBus.dll", but its name "NewRelic.Providers.Wrapper.NServiceBus" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.Providers.Wrapper.Wcf3.dll", but its name "NewRelic.Providers.Wrapper.Wcf3" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.Providers.Wrapper.WebApi1.dll", but its name "NewRelic.Providers.Wrapper.WebApi1" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.Providers.Wrapper.WebApi2.dll", but its name "NewRelic.Providers.Wrapper.WebApi2" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.Providers.Wrapper.WebOptimization.dll", but its name "NewRelic.Providers.Wrapper.WebOptimization" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.Providers.Wrapper.WebServices.dll", but its name "NewRelic.Providers.Wrapper.WebServices" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.Reflection.dll", but its name "NewRelic.Reflection" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.SystemExtensions.dll", but its name "NewRelic.SystemExtensions" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.SystemInterfaces.dll", but its name "NewRelic.SystemInterfaces" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.Testing.Assertions.dll", but its name "NewRelic.Testing.Assertions" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.Trie.dll", but its name "NewRelic.Trie" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.TypeInstantiation.dll", but its name "NewRelic.TypeInstantiation" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\Extensions\NewRelic.WeakActions.dll", but its name "NewRelic.WeakActions" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\NewRelic.Agent.Core.dll", but its name "NewRelic.Agent.Core" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\NewRelic.Agent.Extensions.dll", but its name "NewRelic.Agent.Extensions" didn't match. (TaskId:183)
  16&gt;          Considered "newrelic\NewRelic.Profiler.dll", but its name "NewRelic.Profiler" didn't match. (TaskId:183)
  16&gt;      Found related file "C:\Users\ErikBrandstadmoen\Source\Repos\myrepo\packages\Microsoft.AspNet.Mvc.5.2.3\lib\net45\System.Web.Mvc.xml". (TaskId:183)
  16&gt;      The ImageRuntimeVersion for this reference is "v4.0.30319". (TaskId:183)
  </code></pre>
  
  <p>BUT, still, when I compile the views using aspnet_compiler.exe, it complains. And no matter where I put an assembly binding redirect (Applications's root Web.config, Web.config in Views folder), aspnet_compiler.exe doesn't want to respect it. And, it doesn't seem possible to get aspnet_compiler.exe to output anything about what it's actually doing (no log verbosity level settings...)</p>
  
  <p>All I get when compiling the views, is a lot of warnings regarding version 5.2.2.0 vs version 5.2.3.0 of System.Web.Mvc:</p>
  
  <pre><code>16&gt;ASPNETCOMPILER : warning CS1702: Assuming assembly reference 'System.Web.Mvc, Version=5.2.2.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' matches 'System.Web.Mvc, Version=5.2.3.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35', you may need to supply runtime policy
  16&gt;ASPNETCOMPILER : warning CS1702: Assuming assembly reference 'System.Web.Mvc, Version=5.2.2.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' matches 'System.Web.Mvc, Version=5.2.3.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35', you may need to supply runtime policy
  16&gt;ASPNETCOMPILER : warning CS1702: Assuming assembly reference 'System.Web.Mvc, Version=5.2.2.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' matches 'System.Web.Mvc, Version=5.2.3.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35', you may need to supply runtime policy
  (lots of more lines)
  
  16&gt;Done executing task "AspNetCompiler". (TaskId:234)
  16&gt;Done building target "MvcBuildViews" in project "MyWeb.csproj".: (TargetId:376)
  16&gt;Target "Build: (TargetId:377)" in file "C:\Program Files (x86)\MSBuild\14.0\bin\Microsoft.Common.CurrentVersion.targets" from project "C:\Users\ErikBrandstadmoen\Source\Repos\myrepo\Web\MyWeb\MyWeb.csproj" (target "Rebuild" depends on it):
  16&gt;Done building target "Build" in project "MyWeb.csproj".: (TargetId:377)
  16&gt;Target "AfterRebuild: (TargetId:378)" in file "C:\Program Files (x86)\MSBuild\14.0\bin\Microsoft.Common.CurrentVersion.targets" from project "C:\Users\ErikBrandstadmoen\Source\Repos\myrepo\Web\MyWeb\MyWeb.csproj" (target "Rebuild" depends on it):
  16&gt;Done building target "AfterRebuild" in project "MyWeb.csproj".: (TargetId:378)
  16&gt;Target "Rebuild: (TargetId:379)" in file "C:\Program Files (x86)\MSBuild\14.0\bin\Microsoft.Common.CurrentVersion.targets" from project "C:\Users\ErikBrandstadmoen\Source\Repos\myrepo\Web\MyWeb\MyWeb.csproj" (entry point):
  16&gt;Done building target "Rebuild" in project "MyWeb.csproj".: (TargetId:379)
  </code></pre>
  
  <p>Does anyone have any clues on where to continue troubleshooting? I can of course just ignore the CS1702 warning, but I feel that's like driving with my eyes half closed. Any help is appreciated.</p>