datarow[]转换成datatable

DataTable dt;//不为空的DataTable

DataRow[] rows=dt.Select(" c_user_name ='123456' ");//获取datarow[]类型

现需要将查询出来的datarow[]类型再次转换为DataTable时，可以用到下面方法：

/// <summary>

        /// datarow[]转换成datatable

        /// </summary>

        /// <param name="rows"></param>

        /// <returns></returns>

        public DataTable ToDataTable(DataRow[] rows)

        {

            if (rows == null || rows.Length == 0) return null;

            DataTable tmp = rows[0].Table.Clone();  // 复制DataRow的表结构  

            foreach (DataRow row in rows)

            {

                tmp.Rows.Add(row.ItemArray);  // 将DataRow添加到DataTable中 

            }

            return tmp;

        }

 

把一个表的DataRow[]转换为另外的datatable（小技巧）

DataTable dt1 = new DataTable();
        dt1.Columns.Add("a");
        for (int i = 0; i < 10; i++)
        {
            DataRow dr1 = dt1.NewRow();
            dr1["a"] = "1";
            dt1.Rows.Add(dr1);
        }

        DataRow[] drw = dt1.Select("a =" + "1");
        DataTable dt2 = new DataTable();
        dt2 = dt1.Clone();
        foreach (DataRow Drr in drw)
        {
            DataRow dr2 = dt2.NewRow();//如果在此直接用dt2.Rows.Add(Drr)会报错，因为Drr的引用现在为dt1所用
            dr2.ItemArray = Drr.ItemArray;
            dt2.Rows.Add(dr2);
        }