string[] usersToAdd = new string[] { "asd","asdert","gasdff6" };
using (Entities context = new Entities())
{
    foreach (string user in usersToAdd)
    {
        context.AddToUsers(new User { Name = user });
    }
    try
    {
        context.SaveChanges(); //Exception thrown: user 'gasdff6' already exist.
    }
    catch (Exception e)
    {
        //Roll back all changes including the two prevIoUs users.
    }

或者也许这是自动完成的,这意味着如果发生错误,提交更改将被取消,以进行所有更改.
是吗？