为 DataGridView 控件添加行号

虽然好像不经常用到，不过还是记下来防止以后用到

        /// <summary>

        /// 为 DataGridView 控件添加行号

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        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 + ).ToString("d2"),

                datagridview1.RowHeadersDefaultCellStyle.Font,

                rectangle,

                datagridview1.RowHeadersDefaultCellStyle.ForeColor,

                TextFormatFlags.VerticalCenter | TextFormatFlags.Right);

        }