SPlist按PID层级顺序导入datatable

public static System.Data.DataTable GetDataTable( int parentId, SPList list ,System.Data.DataTable dt, int ceng)

        {

            SPQuery query = new SPQuery();

            query.Query = @"<Where>

                          <Eq>

                             <FieldRef Name='PID' />

                             <Value Type='Number'>" + parentId.ToString() + @"</Value>

                          </Eq>

                       </Where>" ;

            SPListItemCollection items=  list.GetItems(query);

            foreach (SPListItem item in items)

            {

                string id = item.ID.ToString();

                string taskName = ceng.ToString()+"#" +item["TaskNmae"].ToString();

                string assignedTo = "DFDSFD" ;

                    //item["AssignedTo"].ToString().Substring(item["AssignedTo"].ToString().LastIndexOf("#") + 1);

                string status = item["Status" ].ToString();

                string pID = item["PID" ].ToString();

                dt.Rows.Add(id,taskName, assignedTo, status, pID);

                dt=GetDataTable(item.ID, list, dt,ceng+1);

            }

            return dt;

        }



PID默认为0，层默认为1