在datatable中添加一序号列

http://topic.csdn.net/t/20050324/09/3876414.html

int colLength = dt.Rows.Count;
            int rowLength = dt.Columns.Count;
            DataRow[] newRows = new DataRow[rowLength];
            DataTable subDT = new DataTable();
           
            for (int i = 0; i < colLength; i++)
            {
                subDT.Columns.Add();
                for (int j = 0; j < rowLength; j++)
                {
                    
                    if (newRows[j] == null) newRows[j] = subDT.NewRow();
                    newRows[j][i] = dt.Rows[i][j];

                }
            }
            foreach (DataRow row in newRows)
            {
                subDT.Rows.Add(row);
            }
            DataRow dr = subDT.NewRow();   
       dr[0]="aaa";   
       dr[1]="bbb";
       subDT.Rows.Add(dr);


            GridView3.DataSource = subDT;
            GridView3.DataBind();