//DataTable数据添加             Hashtable ht = new Hashtable();             DataTable dt = new DataTable();             DataColumn dc = new DataColumn("id");             dt.Columns.Add(dc);             dc = new DataColumn("name");             dt.Columns.Add(dc);             dc = new DataColumn("values");             dt.Columns.Add(dc);             DataRow dr = dt.NewRow();             dr["id"] = 1;             dr["name"] = "张三";             dr["values"] = "A";             dt.Rows.Add(dr);             dr = dt.NewRow();             dr["id"] = 2;             dr["name"] = "李四";             dr["values"] = "B";             dt.Rows.Add(dr);             dr = dt.NewRow();             dr["id"] = 3;             dr["name"] = "张三";             dr["values"] = "C";             dt.Rows.Add(dr);             dataGridView1.DataSource = dt;             //合并             for (int i = 0; i < dt.Rows.Count; i++ )             {                 if (ht.ContainsKey(dt.Rows[i]["name"]))                 {                     //获取行索引                     int index = (int)ht[dt.Rows[i]["name"]];                     //获取最近一次的值(对应values)                     string str = (string)dt.Rows[index]["values"];                     //拼接                     dt.Rows[index]["values"] = str + "|" + dt.Rows[i]["values"];                     //删除重复行                     dt.Rows.RemoveAt(i);                     //调整索引减1                     i--;                 }                 else                 {                     //保存名称以及行索引                     ht.Add(dt.Rows[i]["name"], i);                 } }