今天遇到个问题，需要根据DataTable的两列来分组汇总数量，上网找了下资料，很快就找到大神已经帮忙解决了:-D，在此记下，以便查看~~

DataTable dataTable1 = new DataTable("BlogUser");            dataTable1.Columns.Add(new DataColumn("批号", typeof(String)));            dataTable1.Columns.Add(new DataColumn("类型", typeof(String)));            dataTable1.Columns.Add(new DataColumn("数量", typeof(Int32)));            dataTable1.Rows.Add(new Object[] { "0001", "A", 100 });            dataTable1.Rows.Add(new Object[] { "0002", "B", 200 });            dataTable1.Rows.Add(new Object[] { "0001", "B", 300 });            dataTable1.Rows.Add(new Object[] { "0002", "B", 400 });            dataTable1.Rows.Add(new Object[] { "0003", "A", 500 });            DataView dv = dataTable1.DefaultView;            DataTable dataTable2 = dv.ToTable(true, new string[] { "批号", "类型" });            String s = "";            for (int i = 0; i < dataTable2.Rows.Count; i++)            {                String pc = dataTable2.Rows[i][0].ToString(),                    type = dataTable2.Rows[i][1].ToString();                s += pc + "," + type + "=" + dataTable1.Compute("Sum(数量)", "批号='" + pc                    + "' AND 类型='" + type + "'").ToString() + Environment.NewLine;            }            Console.WriteLine(s);