WTM

    public class City : TopBasePoco,ITreeData<City>
    {
        [Display(Name = "名称")]
        [Required(ErrorMessage = "名称是必填项")]
        public string Name { get; set; }

        public List<City> Children { get; set; }

        [Display(Name = "父级")]
        public City Parent { get; set; }

        [Display(Name = "父级")]
        public Guid? ParentId { get; set; }

        [NotMapped]
        public string Sheng { get; set; }
        [NotMapped]
        public string Shi { get; set; }
        [NotMapped]
        public string Qu { get; set; }
    }