问题描述:

I have a new project created using Visual Studio 2013 with an ADO.NET Entity Data Model (EF6).

Now I have to use some Dynamic Data function (like access to MetaTable object), so I add this code:

MetaModel model = new MetaModel();

model.RegisterContext(() =>

{

return ((System.Data.Entity.Infrastructure.IObjectContextAdapter)new KiwiJuiceEntities()).ObjectContext;

}, new ContextConfiguration() { ScaffoldAllTables = true });

but I've got this error:

Type of context 'System.Data.Entity.Core.Objects.ObjectContext' is not supported

Note that the project have the reference updated to EF6 (system.data.entity.core)

网友答案:

A new preview of Dynamic Data Provider and EntityDataSource control for EF6 has been released. Please check this out, it worked for me.

http://blogs.msdn.com/b/webdev/archive/2014/01/30/announcing-preview-of-dynamic-data-provider-and-entitydatasource-control-for-entity-framework-6.aspx#

To register the provider:

MetaModel model = new MetaModel();
model.RegisterContext(
    new Microsoft.AspNet.DynamicData.ModelProviders.EFDataModelProvider(
       () => new KiwiJuiceEntities()
    ),
    new ContextConfiguration() { ScaffoldAllTables = true }
);     
网友答案:

DynamicData do no support EntityFramework 6 yet so downgrading to EF 5 'solve' the problem.

网友答案:

Yes.

EF 6 does not have System.Data.Objects.ObjectContext. EF 6 has moved some types, including ObjectContext, from System.Data.Entity.dll into EntityFramework.dll, and changed their namespaces. The fact that you get this error suggests you haven't attempted to recompile your application, you've simply replaced EntityFramework.dll and hoped for the best. That won't work. You need to update your code to work with EF 6: you need to remove your references to System.Data.Entity.dll, and update your code to refer to the new types.

It just might be possible for the reference to the IObjectContextAdapter.ObjectContext property to be in some library you're using, but most likely it'll be in your own code. The error message (in the part you didn't include in your question) should tell you where it is coming from.

References:

  • EF 6 System.Data.Objects.ObjectContext Error
  • http://msdn.microsoft.com/en-US/data/dn469466
  • http://support.microsoft.com/kb/2816241
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