.Net 取树形结构的数据

最近遇到了无限层级数据要读取的问题，所有就写了个。

根据当前所有父级，查询出子级内容

private void GetTypeOfWorkforTree(out List<TypeOfWorkDto> workParent, out List<TypeOfWorkDto[]> workList)
        {
            var workData = _typeOfWorkAppService.GetAllTypeOfWorkForTree().Result;//数据库的数据
            workParent = workData.Where(p => p.Parent == null).ToList();

            workList = new List<TypeOfWorkDto[]>();
            for (var item=0;item<workParent.Count();item++)//工头
            {
                var count = new List<TypeOfWorkDto>();
                count.Add(workParent[item]);
                for (var i = 0; i < count.Count(); i++)//工头下面的种类
                {
　　　　　　　　　　　　//查询子级
                    var resultCount = workData.Where(x => x.ParentId == count[i].Id).ToList();
                    foreach (var u in resultCount)
                    {
                            count.Add(u);
                    }
                }
                workList.Add(count.ToArray());//合并类别
            }
        }