自己在做WINFORM小玩意的時候需要在datagridview上顯示行号，上網搜尋一下，找到如下代碼，不錯，先記錄下來了。
在RowPostPaint事件中畫出來
// 繪制行号
private void gvdata_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
{
try
{
Rectangle rectangle = new Rectangle(e.RowBounds.Location.X,
Convert.ToInt32(e.RowBounds.Location.Y + (e.RowBounds.Height - gvdata.RowHeadersDefaultCellStyle.Font.Size) / 2),
gvdata.RowHeadersWidth - 4, e.RowBounds.Height);
TextRenderer.DrawText(e.Graphics, (e.RowIndex + 1).ToString(),
gvdata.RowHeadersDefaultCellStyle.Font, rectangle, gvdata.RowHeadersDefaultCellStyle.ForeColor,
TextFormatFlags.Right);
}
catch (Exception ex)
Console.Write("dgv1_RowPostPaint：" + ex.Message);
}
效果如圖：