public void AttachExample()
{
Console.WriteLine("Attach Example");
Department department1 = new Department();
department1.Name = "Production";
Department department2 = new Department();
department2.DepartmentID = 10;
department2.Name = "Finance";
using (EFCoreContext db = new EFCoreContext())
{
Console.WriteLine("Status Before Attach department1 " + db.Entry(department1).State.ToString()); //Detached
Console.WriteLine("Status Before Attach department2 " + db.Entry(department2).State.ToString()); //Detached
db.Attach(department1);
db.Attach(department2);
Console.WriteLine("Status After Attach department1 " + db.Entry(department1).State.ToString()); //Added
Console.WriteLine("Status After Attach department2 " + db.Entry(department1).State.ToString()); //Unchanged
db.Entry(department1).State = EntityState.Detached;
Console.WriteLine("Status After Detach department1 " + db.Entry(department1).State.ToString()); //Added
}
Console.WriteLine("Press any key to continue ");
Console.ReadKey();
}