datagridview显示行号

添加datagridview的RowPostPaint事件。

private void dataGridView1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)        {            var grid = sender as DataGridView;            var rowIdx = (e.RowIndex + 1).ToString();            var centerFormat = new StringFormat()            {                // right alignment might actually make more sense for numbers                  Alignment = StringAlignment.Center,                LineAlignment = StringAlignment.Center            };            var headerBounds = new Rectangle(e.RowBounds.Left, e.RowBounds.Top, grid.RowHeadersWidth, e.RowBounds.Height);            e.Graphics.DrawString(rowIdx, this.Font, SystemBrushes.ControlText, headerBounds, centerFormat);        }