C# DataGridView 在最左侧显示行号方法

代码：

        private void dataGridView1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)

        {

            DataGridView dgv = sender as DataGridView;

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

                                                e.RowBounds.Location.Y,

                                                dgv.RowHeadersWidth - ,

                                                e.RowBounds.Height);

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

                                    dgv.RowHeadersDefaultCellStyle.Font,

                                    rectangle,

                                    dgv.RowHeadersDefaultCellStyle.ForeColor,

                                    TextFormatFlags.VerticalCenter | TextFormatFlags.Right);

        }

效果：