一个DataTable的行列转换代码

来源：互联网发布：知乎专栏打不开编辑：程序博客网时间：2024/05/12 15:45

public static void Main()
        {
            DataTable dt = new DataTable();
            dt.Columns.Add("name");
            dt.Columns.Add("type");
            dt.Columns.Add("relt");

            for (int i = 0; i < 4; i++)
            {
                DataRow dr = dt.NewRow();
                dr["name"] = "name" + i;
                dr["type"] = "type" + i;
                dr["relt"] = "relt" + i;

                dt.Rows.Add(dr);
            }

            DisplayTable(dt);

            Console.WriteLine("/r/n =====> 进行行列转换 /r/n");

            DisplayTable(ColumnToRow(dt, 0));

            Console.ReadLine();
        }

        public static DataTable ColumnToRow(DataTable src_dt, int columnIndex) //columnIndex 用来当作新列名的列
        {
            DataTable dt = new DataTable();
            dt.Columns.Add(src_dt.Columns[columnIndex].ColumnName);

            foreach (DataRow dr in src_dt.Rows)
                dt.Columns.Add(dr[columnIndex].ToString());

            int n = src_dt.Columns.Count;
            for (int i = 0; i < n; i++)
            {
                if (i == columnIndex) continue; //如果是被当作列名的列,则跳过

                DataRow new_dr = dt.NewRow();
                string columnName = src_dt.Columns[i].ColumnName;
                new_dr[0] = columnName;

                foreach (DataRow dr in src_dt.Rows)
                {
                    string newColumnName = dr[columnIndex].ToString();
                    new_dr[newColumnName] = dr[columnName];
                }

                dt.Rows.Add(new_dr);
            }

            return dt;
        }

name type relt
name0 type0 relt0
name1 type1 relt1
name2 type2 relt2
name3 type3 relt3

=====> 进行行列转换

name name0 name1 name2 name3
type type0 type1 type2 type3
relt relt0 relt1 relt2 relt3