'ObjectContext' vs 'DbContext' in Entity Framework

From ObjectContext VS DBContext.

Dbcontext can be defined as a lightweight version of the ObjectContext or we can say Dbcontext is a wrapper of ObjectContext and exposes only the common features that are really required in programming. We can also get a reference to the ObjectContext from then DbContext to use those features that are only supported in ObjectContext.

The following code could help to get an ObjectContext Object from an existing DbContext Object.

public class EntityDBContext: DbContext, IObjectContextAdapter
{
   ObjectContext IObjectContextAdapter.ObjectContext
   {
        get
        {
              var objectContext = (this as IObjectContextAdapter)
              if(objectContext != null)
                return (this as IObjectContextAdapter).ObjectContext;
              else
                return null;
        }
   }
}

Finally, DbContext is not a replacement of ObjectContext, but it is a simple alternative that builds on ObjectContext.

We can cast a DBContext to type ObjectContext

public class MyContext: DbContext
{
    public DbSet<Blog> Blogs { get; set; }
   //other dbsets, ctor etc.

    public ObjectContext ObjectContext()
    {
        return (this as IObjectContextAdapter).ObjectContext;
    }
}