话不多说，在RowPostPaint事件中写入下面代码：
private void dataGridView1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
{
DataGridView dgv = (DataGridView)sender;
SolidBrush b = new SolidBrush(dgv.RowHeadersDefaultCellStyle.ForeColor);
e.Graphics.DrawString((e.RowIndex + 1).ToString(System.Globalization.CultureInfo.CurrentUICulture), dgv.DefaultCellStyle.Font, b,
e.RowBounds.Location.X + 20, e.RowBounds.Location.Y + 4);
}
效果：
image.png
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