.net list转树状结构

主要的方法

       /// <summary>
        /// 转化成树结构
        /// </summary>
        /// <param name="menuList">菜单的平级list</param>
        /// <returns></returns>
        private List<AbpMenuModel> GetTreeParent(List<AbpMenuDto> menuList)
        {
            var dic = new Dictionary<long, AbpMenuModel>(menuList.Count);
            foreach (var chapter in menuList)
            {
                dic.Add(chapter.Id, new AbpMenuModel { Id = chapter.Id, Title = chapter.Title, Path = chapter.Path, ParentId = chapter.ParentId, Icon = chapter.Icon });
            }
            foreach (var chapter in dic.Values)
            {
                if (dic.ContainsKey(chapter.ParentId.Value))
                {
                    if (dic[chapter.ParentId.Value].Children == null)
                    {
                        dic[chapter.ParentId.Value].Children = new List<AbpMenuModel>();

                    }
                    dic[chapter.ParentId.Value].Children.Add(chapter);
                }
            }
            return dic.Values.Where(t => t.ParentId == 0).ToList();
        }

转换前的类

    [AutoMapTo(typeof(AbpMenuDto))]
    public class AbpMenuDto : EntityDto<long>
    {
        /// <summary>
        /// 路径
        /// </summary>
        public string Path { get; set; }
        /// <summary>
        /// 菜单名
        /// </summary>
        public string Title { get; set; }
        /// <summary>
        /// 图标
        /// </summary>
        public string Icon { get; set; }

        /// <summary>
        /// 父级ID
        /// </summary>
        public long? ParentId { get; set; }
        /// <summary>
        /// 类型  菜单（menu） 还是  元素(doc)(按钮等)
        /// </summary>
        public string Type { get; set; }
        /// <summary>
        ///  doc时 的父级下唯一代码
        /// </summary>
        public string Code { get; set; }

        /// <summary>
        ///  doc时 的名称
        /// </summary>
        public string Name { get; set; }
    }

转换后的类

 public class AbpMenuModel : EntityDto<long>
    {
        /// <summary>
        /// 路径
        /// </summary>
        public string Path { get; set; }
        /// <summary>
        /// 菜单名
        /// </summary>
        public string Title { get; set; }
        /// <summary>
        /// 图标
        /// </summary>
        public string Icon { get; set; }

        /// <summary>
        /// 父级ID
        /// </summary>
        public long? ParentId { get; set; }
        /// <summary>
        /// 类型  菜单（menu） 还是  元素(doc)(按钮等)
        /// </summary>
        public string Type { get; set; }
        /// <summary>
        ///  doc时 的父级下唯一代码
        /// </summary>
        public string Code { get; set; }

        /// <summary>
        ///  doc时 的名称
        /// </summary>
        public string Name { get; set; }

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