MVC4: Compilation Error The type 'System.Data.Objects.DataClasses.EntityObject' is defined in an assembly that is not referenced

Question

The following line of code is throwing the following error when i try to load the page:

CS0012: The type 'System.Data.Objects.DataClasses.EntityObject' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.

@Html.DropDownListFor(model => model.Courses.Id, Model.CourseList)

In MVC3, I remember fixing this easily by adding the following line in the web.config file:

<add assembly="System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />

However in MVC4 you cannot use the tag anymore, so I'm not sure how I can resolve it. Any help is greatly appreciated.

Project -> references -> right-click -> add reference

Casey
– Casey

2014-07-25 18:31:30 +00:00
Commented Jul 25, 2014 at 18:31 — Casey
– Casey, Commented Jul 25, 2014 at 18:31

GomuGomuZoro · Accepted Answer · 2014-07-25 18:38:47Z

8

nvm, I was wrong you have to open up the tag and add the tag yourself.

Solution:

<compilation debug="true" targetFramework="4.0">
  <assemblies>
      <add assembly="System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
    </assemblies>
  </compilation>

answered Jul 25, 2014 at 18:38

GomuGomuZoro

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olif · Accepted Answer · 2014-07-25 18:31:32Z

1

Add a reference to Entity Framework in your MVC project. That should fix the issue.

answered Jul 25, 2014 at 18:31

olif

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Nibedita Panda · Accepted Answer · 2014-12-15 10:21:31Z

1

This solution has worked for me:

<compilation debug="true" targetFramework="4.5"> <assemblies> <add assembly="System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" /> </assemblies>

answered Dec 15, 2014 at 10:21

Nibedita Panda

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dellyjm · Accepted Answer · 2016-06-01 23:27:26Z

0

Load User Profile in the Application Pool Advance Settings.

This approach solved this for me.

answered Jun 1, 2016 at 23:27

dellyjm

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