DataSet 动态添加列

 public DataSet GetNewId(List<string> IdArr)

        {

            DataSet ds = new DataSet();

            DataTable newtb = new DataTable();

            DataColumn column = new DataColumn("cnt", typeof(string));//新增列

            newtb.Columns.Add(column);

            for (int i = ; i < IdArr.Count; i++)

            {

                StringBuilder sbSql = new StringBuilder();

                sbSql.Append("insert into y (PatientID,PathologyNumber,PatientState,Classification,HospitalOfDelivery,DepartmentOfDelivery,"+

                               " Remark8,CliMedicalID,MedicalClass,ImageCheck,ControlType from  y where id='" + IdArr[i] + "'; SELECT @@IDENTITY as id");

                 object o = DbHelperMySQL.GetSingle(sbSql.ToString());

                 if (o!=null)

                 {

                     DataRow newRow = newtb.NewRow();

                     newRow["cnt"] = o.ToString();

                     newtb.Rows.Add(newRow);

                 }

            }

            ds.Tables.Add(newtb);

            return ds;

        }