Viewbag.Title error: One or more types required to compile a dynamic expression cannot be found. Are you missing a reference?

Question

I have an ASP.NET MVC 5 web application. In every .cshtml view file i get the following error for Viewbag: One or more types required to compile a dynamic expre

Answer 1

I hope this will help someone. Works for me in VS 2013 with asp.net MVC 5 and .NET 4.6.1

Readding Microsoft.CSharp did not fix the problem. Also, adding System.Core to system.web/compilation/assemblies/ at web.config did not fix too.

I overcame this only this adding System.Web.Mvc to system.web/compilation/assemblies/ section:

<compilation debug="true" targetFramework="4.6.1">
  <assemblies>
      <add assembly="System.Web.Mvc, Version=5.2.3.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
  </assemblies>
</compilation>

Rebuilded the solution and red line disappeared.

Answer 2

Add the following to Application_Start() method in global.asax

ViewEngines.Engines.Add(new RazorViewEngine());

Answer 3

For reference Microsoft.CSharp, change the value of property Copy Local from False to True.

Answer 4

This happened to me after I made a code change on the cshtml page with a syntax error. After correcting the syntax error, the errors persisted. So, I closed the cshtml and re-compiled... success. I reopened the cshtml and the errors were no longer there.

Answer 5

I do not have this problem when running VS 2012 as administrator.

Otherwise, what worked for me:

1. in root web config have added as recommended reference to correct assembly as child of compilation node <system.web> <compilation debug="true" targetFramework="4.5"> <assemblies> <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" /> </assemblies></compilation> </system.web>

2. set copy local = true properties for System.Core and Microsoft.CSharp