when I run a query in EF, the DbContext in it automatically caches the data that it retrieves from the database using query. In some cases it is helpful but I need to to hit database and get in which data changes outside the context. So I did some researches and I saw I need to refresh my dbcontext. I tried it bu it gives following error. How to fix this error?

The refresh attempt has failed because an unexpected entity was returned by the data source.

using (var ctx = new MyDbContext()){
..
var objContext = ((IObjectContextAdapter)ctx).ObjectContext;
var refreshEntities = ctx.ChangeTracker.Entries().Select(x => x.Entity).ToList();
objContext.Refresh(RefreshMode.StoreWins, refreshEntities);
..
}

Context;

 public MyDbContext() : base(OraConnection(), true) { }
             public DbSet<Books> Book{ get; set; }
             public DbSet<Libraries> Library{ get; set; }