沒有想到好的方法，這是最笨的方法，對datatable的逐行進(jìn)行匯總。???????

?????DataTable ddt = new DataTable();
???????????? for (int i = 0; i < dt.Rows.Count; i++)
??????????? {
??????????????? string ConnectStrings = dt.Rows[i]["DB_UU_Boat"].ToString();
??????????????? DataTable dtrows = gs.GetLostCountDetail(ConnectStrings, dayNum);
??????????????? ddt.Merge(dtrows);//合并表格
??????????? }
??????????? DataView dv = ddt.DefaultView;
??????????? dv.Sort = "visitTime";//排序，按照字段visitTime進(jìn)行排序
??????????? ddt = dv.ToTable();//保存排序后的table
??????????? DataTable dtds = ddt.Clone();//新建一個結(jié)構(gòu)相同的表格，用來存放結(jié)果
??????????? string ssc = "";
??????????? for (int i = 0; i < dv.Count; i++)
??????????? {
??????????????? if (ssc == ddt.Rows[i]["visitTime"].ToString())//如果是重復(fù)的，則跳過！
??????????????? {
??????????????????? continue;
??????????????? }
??????????????? string sB = ddt.Compute("Sum(D_count)", "visitTime=" + ddt.Rows[i]["visitTime"].ToString()).ToString();//根據(jù)相同的visitTime來匯總D_count
??????????????? ssc = ddt.Rows[i]["visitTime"].ToString();
??????????????? DataRow dtro = dtds.NewRow();//新建一個datarow，來承接匯總后的數(shù)據(jù)
??????????????? dtro[0] = sB;
??????????????? dtro[1] = ssc;
??????????????? dtds.Rows.Add(dtro);//把得到新數(shù)據(jù)添加到新表中
??????????? }

轉(zhuǎn)載于:https://www.cnblogs.com/hanyihua99/archive/2009/06/24/1510014.html

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