c# 如何給 dataGridView里添加一個自增長列(列名為序號)

System.Data.DataTable table = new DataTable();
                System.Data.DataColumn column = new DataColumn();

                column.ColumnName = "序號";
                column.AutoIncrement = true;
                column.AutoIncrementSeed = 1;
                column.AutoIncrementStep = 1;

                table.Columns.Add(column);
                table.Merge(ds.Tables[0]);

                datagridview1.DataSource = table;
                datagridview1.Columns["序號"].DisplayIndex = 0;//調整列順序
復制過來的，希望對你有幫助，c# 支持 隱式的轉換，你也可以用Convert 來轉換類型

你也可以使用：
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {        if (e.Row.RowIndex >= 0)
        {          
            e.Row.Cells[0].Text = Convert.ToString(e.Row.DataItemIndex + 1);
        }
}