C# winform datagridview rowheader 添加行标题的方法

        #region 写行号事件
        //在DataGridView控件上选择RowPostPaint事件
        private void dgvJointList_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
        {
            ((DataGridView)sender).fillRowHeaderIndex(e);
        }
        #endregion

        #region DataGridView的RowPostPaint事件中使用的添加行标题的公用方法
        /// 

        /// DataGridView的RowPostPaint事件中使用的添加行标题的公用方法
        /// 
        /// DataGridView名
        /// DataGridViewRowPostPaintEventArgs事件名
        public static void fillRowHeaderIndex(this DataGridView dgv, DataGridViewRowPostPaintEventArgs e)
        {
            Rectangle rectangle = new Rectangle
            (
                e.RowBounds.Location.X,
                e.RowBounds.Location.Y,
                dgv.RowHeadersWidth - 4,
                e.RowBounds.Height
            );
            TextRenderer.DrawText
            (
                e.Graphics,
                (e.RowIndex + 1).ToString(),
                dgv.RowHeadersDefaultCellStyle.Font,
                rectangle,
                dgv.RowHeadersDefaultCellStyle.ForeColor,
                TextFormatFlags.VerticalCenter | TextFormatFlags.Right
            );
        }
        #endregion