ds.Tables[0].Columns.Add("NewItem"); foreach (DataRow dr in ds.Tables[0].Rows) { dr["NewItem"] = dr["Item1"].ToString()+dr["Item2"]; }
var rows = _dsNotClass.Tables[0].Rows.Count;
                        var k = rows / 3; //除以行数
                        var p = rows % 3; //余数
                        var m = 0;
                        for (int j = 0; j < k; j++)
                        {
                            for (int g = 0; g < 3; g++)
                            {
                                m = g + 3 * j;
                                strXJH += "," + _dsNotClass.Tables[0].Rows[m]["XJH"].ToString();
                            }
                            list_xjh.Add(strXJH);
                            strXJH = "";
                        }
                        if (p != 0)
                        {
                            for (int q = 0; q < p; q++)
                            {
                                m = 3 * k + q;
                                strXJH += "," + _dsNotClass.Tables[0].Rows[m]["XJH"].ToString();
                            }
                            list_xjh.Add(strXJH);
                            strXJH = "";
                        }
没懂,你问什么
DataSet数据集 在这个数据集中如何把两条数据,合并为一条数据添加到集合中