datagaridview添加序号

winform表格datagaridview添加序号 

private void dgvBeforeGZ_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
        {
            var dgv = (DataGridView)sender;
            if (dgv.RowHeadersVisible)
            {
                Rectangle rectangle = new Rectangle(e.RowBounds.Left, e.RowBounds.Top, e.RowBounds.Width, e.RowBounds.Height);
                rectangle.Inflate(-3, 0);
                TextRenderer.DrawText(e.Graphics, (e.RowIndex + 1).ToString(), e.InheritedRowStyle.Font, rectangle, e.InheritedRowStyle.ForeColor, TextFormatFlags.Left | TextFormatFlags.VerticalCenter);
            }
        }