WinForm DataGridView 显示行号

private void dataGridView1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)

{

Rectangle rectangle = new Rectangle(e.RowBounds.Location.X,

e.RowBounds.Location.Y,

dataGridView1.RowHeadersWidth,

e.RowBounds.Height);

TextRenderer.DrawText(e.Graphics, (e.RowIndex + 1).ToString(),

dataGridView1.RowHeadersDefaultCellStyle.Font,

rectangle,

dataGridView1.RowHeadersDefaultCellStyle.ForeColor,

TextFormatFlags.VerticalCenter | TextFormatFlags.Right);

}