无限级分类查找节点的所有子级和父级

无限级分类数据表：

SQL代码:
create table t_power(
        id int not null IDENTITY(1,1) PRIMARY KEY,      --权限ID
        ParentId int not null default(0),               --父级ID
        Depath int not null default(0),         --级数
        [Name] varchar(100) default('') not null,                            --名称
        IsMenu int not null default(0),                      ---是否为菜单项
        )
go
查找节点的所有子级:

C#代码:
/// 
        /// 获取子级 返回子级
        /// 
        /// 父级id
        ///子级列表
        public static void GetChild(int parentId,ref IList powerlist )
        {
                        string strsql = "select * from t_power where ParentId=" + parentId.ToString();
            using (SqlDataReader dr = sql.ExecuteReader(strsql))
            {
                if (!dr.HasRows)
                    return;
                while (dr.Read())
                {
                    PInfop = new PInfo();
                    p.Id = Convert.ToInt32(dr["id"]); ;
                    p.ParentId = Convert.ToInt32(dr["ParentId"]);
                    p.Depath = Convert.ToInt32(dr["Depath"]);
                    p.Name = dr["Name"].ToString();
                    p.IsMenu = Convert.ToInt32(dr["IsMenu"]);
                    powerlist.Add(p);
                    GetChild(Convert.ToInt32(dr["id"]), ref powerlist);
                }
            }
        }查找所有父级：


C#代码:
 /// 
        /// 获取所有祖先
        /// 
        /// 当前ID
        /// 列表
        public static IList GetParentPower(int powerid) {
            IList  powerList = new List();
                       string strsql = @"
                declare @tempTable TABLE
                (
                 [id] int,
                 ParentId int,
                 Depath int,
                 [Name] varchar(100),
                 IsMenu int,
                 Url varchar(200)
                )

                declare @oldId int
                declare @ID int
                set @ID={0}
                set @oldId=@ID
                while(@ID>0)
                begin
                    select @ID=ParentId from t_power where ID=@ID;
                        if @oldId=@ID
                                break
                        if(@ID>0)
                        begin
                    insert into @tempTable select * from t_power where ID=@ID;
                        end
                end
                select * from @tempTable order by id asc
            ";
            strsql = string.Format(strsql, powerid);
            using (SqlDataReader dr = sql.ExecuteReader(strsql))
            {
                while (dr.Read())
                {
                    PowerInfo p = new PowerInfo();
                    p.Id = Convert.ToInt32(dr["id"]); ;
                    p.ParentId = Convert.ToInt32(dr["ParentId"]);
                    p.Depath = Convert.ToInt32(dr["Depath"]);
                    p.Name = dr["Name"].ToString();
                    p.IsMenu = Convert.ToInt32(dr["IsMenu"]);
                    powerList.Add(p);
                }
            }
            return powerList;
        }
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