Updating to RAZOR 3.0 in MVC 4

Hi:

I've taken the basic MVC 4 Internet package and done an update for all Nuget packages.  When I try to launch the app, I get the following error:

[A]System.Web.WebPages.Razor.Configuration.HostSection cannot be cast to [B]System.Web.WebPages.Razor.Configuration.HostSection. Type A originates from 'System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' in the context 'Default' at location 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.WebPages.Razor\v4.0_2.0.0.0__31bf3856ad364e35\System.Web.WebPages.Razor.dll'. Type B originates from 'System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' in the context 'Default' at location 'C:\Users\rbs\AppData\Local\Temp\Temporary ASP.NET Files\root\ddc954c1\d11f66f6\assembly\dl3\d2c56f64\60106b14_22dece01\System.Web.WebPages.Razor.dll'.

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Any help on how to fix this greatly appreciated.

RBS
RBSAsked:
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Dustin HopkinsConnect With a Mentor Senior Web DeveloperCommented:
Hi,
Check your root web.config assemblyBinding section. Make sure that it contains the updated versions for "System.Web.WebPages.Razor" and "System.Web.Mvc". Make sure that they exist and that the versions are correct. Should be 3.0 and 5.0. As of now the code should look like the code below. BTW, the public key tokens won't change between versions.

<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
  <dependentAssembly>
        <assemblyIdentity name="System.Web.WebPages.Razor"
            publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0"/>
  </dependentAssembly>

  <dependentAssembly>
    <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
    <bindingRedirect oldVersion="1.0.0.0-5.0.0.0" newVersion="5.0.0.0" />
  </dependentAssembly>
</assemblyBinding>

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Hope this helps,
Dustin
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RBSAuthor Commented:
Thanks Dustin - that helped.  I had to also update the web config in my views section to reference the new razor version.  Also, I was wondering - The program seems to have loaded Entity Framework 6 - though I changed it to 5 as per instructions and it seems to work.  Am I using version 5 of EF or is this something about assembly binding that I don't understand.

Thanks,
RBS
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Dustin HopkinsSenior Web DeveloperCommented:
RBS, the assemblyBindings I referenced were for System.Web.Mvc and System.Web.WebPages.Razor.

Then EF6 Setting should be towards the top in configSections and be referencing 6.0.0.0. See below:
<configSections>
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>

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So far as the pages section in the Views Web.Config, you should just be able to change them to reference MVC 5.0. This is because even though you started a MVC 4 project when you updated through NuGet you actually made it an MVC 5.0 project.
Here is the updated code in the Views Web.config
 <pages
        validateRequest="false"
        pageParserFilterType="System.Web.Mvc.ViewTypeParserFilter, System.Web.Mvc, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"
        pageBaseType="System.Web.Mvc.ViewPage, System.Web.Mvc, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"
        userControlBaseType="System.Web.Mvc.ViewUserControl, System.Web.Mvc, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
      <controls>
        <add assembly="System.Web.Mvc, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" namespace="System.Web.Mvc" tagPrefix="mvc" />
      </controls>
    </pages>

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Notice the only change I made was to set all the versions to 5.0. These changes made the OOB solution work. I hope this helps you.

Dustin
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Dustin HopkinsSenior Web DeveloperCommented:
I know you're probably beyond this by now, but I just found tutorial on asp.net for upgrading MVC4 applications to MVC5.

You can migrate a VS 2012 project using this tutorial without problems, but there is no design time support for Razor 3 in VS2012 because of  changes in the way VS loads the razor engine.

You can edit razor pages in VS2012, but it will be a plain HTML editor.

How to upgrade an MVC4 project to MVC5


Hope this helps,
Dustin
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RBSAuthor Commented:
Dustin:

Thanks so much for your help.  Very informative and useful.

Regards,
RBS
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