EF Code First教程-02 约定配置

    public class Phone
    {
        [Key] //主键
        public int Id { get; set; }

        [Required] //不能为空
        [MinLength(2),MaxLength(20)]  //最小长度2，最大长度20
        public string Name { get; set; }

        [StringLength(50)]  //字符串长度为50
        public string Number { get; set; }
        public DateTime CreateDate { get; set; }
        public bool IsValid { get; set; }
        public string Carrieroperator { get; set; }
    }