Reputation: 135

ASP.NET MVC4 WebAPI EntityFramework exception

I am trying to create a webapi controller, within a site. it is a template controller, nothing changed from what visual studio has inserted.

The code is within an MVC4 site, which runs completely without any errors, however, when I call webapi controller, I am receiving this error:

Could not load file or assembly 'EntityFramework, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The system cannot find the file specified.

I have uninstalled EntityFramework nuget package, and when I search in entire solution, it is not found in any file, however, I am repeatedly receiving this error.

Any clues what might be a possible solution to this?

Upvotes: 3

Answers (8)

user941029

Reputation: 1

In my case, since I was using .NET 4.0 I had to revert back to EntityFramework 4.1 after my uprade to VS2012 (needed for a different project).

Running in the Package Manager Console in VS 2010 this command:

PM> Install-Package EntityFramework -Version 4.1.10715.0

Upvotes: 0

SushiGuy

Reputation: 1637

Removing the web.config dependentAssembly lines for EntityFramework fixed it for my project.

Screenshot of web.config code - dependentAssembly - EntityFramework

Upvotes: 0

Katie Kilian

Reputation: 6983

Try opening the .csproj file for your project in a text editor such as Notepad and searching for the phrase "EntityFramework". If it turns up hits, that may give you a clue as to what that problem is.

Upvotes: 0

smartcaveman

Reputation: 42276

Try deleting the obj and bin folders for each project then rebuilding the application. This has helped me fix the same problem on more than one occasion.

Upvotes: 0

Szilard Muzsi

Reputation: 1901

it is a template controller, nothing changed from what visual studio has inserted.

Entity Framework might be a dependency because of these templates. Some of the templates will generate DataControllers, which require EF. If you read carefully, you will see in the text displayed by the template: "Generate ...., using Entity Framework"

If that is not the case, and you have simple ApiControllers, and you've uninstalled EF, double-check your packages.config file, to make sure that there is no reference to Entity Framework there either.

Upvotes: 0

Josh Schultz

Reputation: 8190

Try adding the following to your web.config file:

  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="EntityFramework" publicKeyToken="b77a5c561934e089" />
        <bindingRedirect oldVersion="0.0.0.0-4.3.1.0" newVersion="4.3.1.0" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>

Upvotes: 1

s33sharp_94

Reputation: 111

I had the same problem.

All things were working and then just started to give a 404 for all web api requests.

I have tried everything .. the only thing that resolved my issue was to add a reference of EF 4.1.0.0 to my project and also to add it to Web.config.

It strange because nowhere in my solution im using or referencing EF.

I didnt have 4.1 version and I downloaded it from here http://www.microsoft.com/en-us/download/details.aspx?id=26825

I found why EF 4.1 is listed as dependency. The error came only when i wanted to publish the site. And what i did is only to Add Deployable Dependecies and check ASP.NET MVC, because the host server didn't have MVC 4 installed. When i looked on _bin_deployableAssemblies folder

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