public Criteria(long? acctNbr, long? applNbr, object[] fetchOptions)
                : base(fetchOptions) //:base继承于父类，初始化父类的构造函数
            {
                this._acctNbr = long.MinValue;
                this._applNbr = long.MinValue;                
                long? CSS0S0000 = acctNbr;//long? css0s0000=构造函数参数


                 //类的字段_acctnbr=构造函数之参数acctnbr
                 //hasvalue及getvalueordefault方法
                this._acctNbr = CSS0S0000.HasValue ? CSS0S0000.GetValueOrDefault() : long.MinValue;
 
                 //在构造函数中同一个局部变量可以进行多次赋值
                 //让css0s0000=构造函数参数applnbr
                CSS0S0000 = applNbr;
                this._applNbr = CSS0S0000.HasValue ? CSS0S0000.GetValueOrDefault() : long.MinValue;                
            }