public abstract class AccountRole //这是继承类型    {        [Key]        public int ID { get; set; }        public bool isDisabled { get; set; }        public string email { get; set; }        public string remark { get; set; }        public string firstName { get; set; }        public string lastName { get; set; }        public string taskss { get; set; }        [ForeignKey("account")]        public int Accounts_id { get; set; }        public virtual Account account { get; set; }        [DatabaseGenerated(DatabaseGeneratedOption.Computed)]        public DateTimeOffset rowCreatedDT { get; set; }        [DatabaseGenerated(DatabaseGeneratedOption.Computed)]        [ConcurrencyCheck]        public byte[] rowVersion { get; set; }        [ForeignKey("rowCreator")]        public int? rowCreatorLoginAccounts_ID { get; set; }        [ForeignKey("rowLastModifiedBy")]        public int? rowLastModifiedByLoginAccounts_ID { get; set; }        public virtual LoginAccount rowCreator { get; set; }        public virtual LoginAccount rowLastModifiedBy { get; set; }    }public class MemberRole : AccountRole //memberROle 继承 accountROle    {        public MemberRole()        {            businessResultComplex = new BusinessResultComplex { };            monthlyTaskComplex = new MonthlyTaskComplex { };        }        public string investorOrIB { get; set; }        public string MT4ID { get; set; }        public string fullName { get; set; }        public DateTime dateOfBirth { get; set; }        public string alternativeEmail { get; set; }        public string contactNumber { get; set; }        public string gender { get; set; }         public BeneficiaryComplex beneficiaryComplex { get; set; } //complex 类型        public AddressComplex addressComplex { get; set; }        public BankComplex bankComplex { get; set; }        public BusinessResultComplex businessResultComplex { get; set; }        public MonthlyTaskComplex monthlyTaskComplex { get; set; }        public DateTimeOffset lastLoginDT { get; set; }  //dateTime原始类型        public DateTime TTDate { get; set; } //date原始类型                        [ForeignKey("currentLevel")]        public int Levels_ID { get; set; }                   public MemberMLMRelationTree MLMRelationTree { get; set; }         public BankBalance bankBalance { get; set; }        public Level currentLevel { get; set; }        public List
     
       historyLogins { get; set; }        public List
      
        historyBankTransactions { get; set; }                 public List
       
         historyLevels { get; set; }        public List
        
          withdrawals { get; set; }         public List
         
           contracts { get; set; }    }　　public class HistoryLogin : RowInfo    {        [Key]        public int ID { get; set; }        [ForeignKey("member")]        public int Members_ID { get; set; }        public MemberRole member { get; set; }    }
         
        
       
      
     

EFDB是sql的结构, 大家都是类型(class), 但是有些时候会有大量重复, 所以会有继承(abstract)

原始类型有 string, int, datetime, date

在类型里可以有其他类型, 如果类型是complex就是一种集合(规范) , list(这是多对多或一对多的关系) , enum