DataGridView 表头显示序号

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       private void dgvResult_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
       {
            // 设置表头宽度
            SizeF strSizeF = e.Graphics.MeasureString((e.RowIndex + 1).ToString(),this.dgvResult.RowHeadersDefaultCellStyle.Font);
            if (strSizeF.Width + 20 > this.dgvResult.RowHeadersWidth)
                this.dgvResult.RowHeadersWidth = 20 + (int)strSizeF.Width;
            // 表头显示序号
            SolidBrush b = new SolidBrush(this.dgvResult.RowHeadersDefaultCellStyle.ForeColor);
            e.Graphics.DrawString(
                (e.RowIndex + 1).ToString(System.Globalization.CultureInfo.CurrentUICulture),
                this.dgvResult.DefaultCellStyle.Font,
                b,
                e.RowBounds.Location.X + 10,
                e.RowBounds.Location.Y + 4);
        }