MVC4 Azure Publishing Error - Could not load file or assembly 'System.Web.Razor'

Question

The project runs fine locally, its only when published I get the following error:

Could not load file or assembly 'System.Web.Razor' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

Having spent the last few hours googling the problem seems to be that a nuget package I added to the project references razor 1 and overwrote my razor 2 dll. I've tried copying the razor 2.0.0.0 dll into refernces instead of 1 but the error persists. This is where the conflict is shown in the detailed build output:

There was a conflict between "System.Web.Razor, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" and "System.Web.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35".
1>      "System.Web.Razor, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" was chosen because it was primary and "System.Web.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" was not.
1>      References which depend on "System.Web.Razor, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" [C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET Web Pages\v1.0\Assemblies\System.Web.Razor.dll].
1>          C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET Web Pages\v1.0\Assemblies\System.Web.Razor.dll
1>            Project file item includes which caused reference "C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET Web Pages\v1.0\Assemblies\System.Web.Razor.dll".
1>              System.Web.Razor, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL
1>      References which depend on "System.Web.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" [C:\Users\Jack\SkyDrive\LessonUp.Current\packages\RazorEngine.3.0.8\lib\net40\System.Web.Razor.dll].
1>          C:\Users\Jack\SkyDrive\LessonUp.Current\packages\Microsoft.AspNet.WebPages.2.0.20710.0\lib\net40\System.Web.WebPages.Razor.dll
1>            Project file item includes which caused reference "C:\Users\Jack\SkyDrive\LessonUp.Current\packages\Microsoft.AspNet.WebPages.2.0.20710.0\lib\net40\System.Web.WebPages.Razor.dll".
1>              System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL 
1>              Recaptcha

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From there it continues to list other packages depending on razor 2.

The packages I added to the project were: Recaptcha, Recaptcha.mvcModel and Postal.
Does anyone have an idea what steps I can take to resolve this?
Let me know if there is any more information I can give that might lead to a solution.

Answer 1

Make sure the 2.0 dll is referenced and copy local = true, then try adding an assembly binding redirect in the web.config:

<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
  <dependentAssembly>
    <assemblyIdentity name="System.Web.Razor" publicKeyToken="31bf3856ad364e35" />
    <bindingRedirect oldVersion="1.0.0.0-2.0.0.0" newVersion="2.0.0.0" />
  </dependentAssembly>
</assemblyBinding?

Answer 2

I had the same problem with Postal 0.8.0 in a MVC4 project. When you install Postal with NuGet it replaces System.Web.Razor 2.0 with System.Web.Razor 1.0. I had to delete the reference to System.Web.Razor 1.0 and then added back in System.Web.Razor 2.0. You have to additionally set Copy Local to True in the Properties for System.Web.Razor and the of course rebuild the project. Once I did that VS2012 copied the System.Web.Razor.dll to the deployed bin directory and the problem cleared.

Postal also adds these dependency's to the web.config. I removed them and it still works properly.

<dependentAssembly>
    <assemblyIdentity name="System.Web.Razor" publicKeyToken="31bf3856ad364e35" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-1.0.0.0" newVersion="2.0.0.0" />
</dependentAssembly>
<dependentAssembly>
    <assemblyIdentity name="WebGrease" publicKeyToken="31bf3856ad364e35" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-1.3.0.0" newVersion="1.3.0.0" />
</dependentAssembly>
<dependentAssembly>
    <assemblyIdentity name="RazorEngine" publicKeyToken="9ee697374c7e744a" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-3.0.8.0" newVersion="3.0.8.0" />
</dependentAssembly>