C# DataSet操作

DataSet添加新列

DataSet ds = jhPhotoAlbum.GetList("JH5='" + key + "'");
ds.Tables[0].Columns.Add("count", typeof(System.String));
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
 {
      ds.Tables[0].Rows[i]["count"] = "11";
 }

 Dataset 获取前10行

          DataSet ds = jhJiFenRecord.GetList("JH1='" + openid + "' and JH6='" + key + "'  order by AddTime desc");
          DataTable mydt = ds.Tables[0];
          if (mydt.Rows.Count > 10)
           {
               DataTable dt = new DataTable();
               dt = ds.Tables[0].Clone();
               for (int i = 0; i < 10; i++)
               {
                   dt.Rows.Add(mydt.Rows[i].ItemArray);
               }
                    mydt = dt;
           }