protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Entity<Account>().HasRequired(b => b.User).WithMany(a => a.Accounts).WillCascadeOnDelete(true);
            base.OnModelCreating(modelBuilder);
        }

 public class User
    {
        [Key]
        [DisplayName("用户编号")]
        public string UserCode { get; set; }
        [DisplayName("用户账号")]
        public string UserAccount { get; set; }
        [DisplayName("用户密码")]
        public string Password { get; set; }
        public  List<Account> Accounts { get; set; }
    }

 public class Account
    {
        [Key]
        public int Id { get; set; }
        [DisplayName("编码")]
        public string UserCode { get; set; }

        [DisplayName("输入者")]
        public string Inputer { get; set; }
        public virtual User User { get; set; }
    }