.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 == ).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; }