C# DataGridView中 显示行号

        private void dgvData_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
        {
            Color color = dgvData.RowHeadersDefaultCellStyle.ForeColor;
            if (dgvData.Rows[e.RowIndex].Selected)
                color = dgvData.RowHeadersDefaultCellStyle.SelectionForeColor;
            else
                color = dgvData.RowHeadersDefaultCellStyle.ForeColor;

            using (SolidBrush b = new SolidBrush(color))
            {
                e.Graphics.DrawString((e.RowIndex + 1).ToString(), e.InheritedRowStyle.Font, b, e.RowBounds.Location.X + 10, e.RowBounds.Location.Y + 6);
            }
        }