解决datatable中DataRow不能复制到另一个DataTable中

        public static DataTable InitDgvProcessWorker()
        {
            ArrayList list=new ArrayList();
            DataTable dt = new DataTable();
            string str=      "select WorkerNO as 工号,[Name] as 姓名,DutyContent as 职  责,[Group]                      
                                as 组名,upperson as 上层 " +   " from UserInfo where [Group]='工序生产人员'  ";
            string Sqlstr =DbHelper.DbHelperSQL.DataQuery(str).Tables[0];
            dt = DbHelper.DbHelperSQL.DataQuery(Sqlstr).Tables[0];
            DataTable ResultTable = dt.Copy();
            ResultTable.Clear();
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                   string upperson= dt.Rows[i]["上层"].ToString();
                   if (upperson.Contains(this.Name))
                    {
                        ResultTable.ImportRow(dt.Rows[i]);//把
                    }
            }
            ResultTable.Columns.Remove("上层");
            return  ResultTable;

        }