C# 字符串。格式未与固定宽度对齐

这是我为订单打印收据的功能，打印工作正常，但我的问题是打印未生成对齐的记录。我已经附加了一个屏幕截图的输出在底部请告诉我，我这样做，使输出良好

private void PrintReceipt(object sender, PrintPageEventArgs e)
    {
        //Graphics g = this.CreateGraphics();
        Graphics graphic = e.Graphics;
        Font font = new Font("Courier", 8);
        Font Heading = new Font("Courier", 10);
        float fontHeight = font.GetHeight();
        int startX = 10;
        int startY = 10;
        int offset = 40;

        int receipt_w = 400;
        //int receipt_h = 0;

        string company_name = "Welcome to Arslan Medicose";
        string company_address = "Kohenoor One Jaranwala road faisalbad";
        string company_phone = "Phone:+9233898937";

        string developer_str = "Developed by: virk";
        string developer_contact = "Phone:+923338989937";

        string underLine = "-------------------------------------------------------------------------------------------------------";


        SizeF size = graphic.MeasureString(company_name, Heading);
        graphic.DrawString(company_name, Heading, new SolidBrush(Color.Black), (receipt_w - size.Width) / 2, startY);

        //offset = offset + (int)fontHeight + 5;
        size = graphic.MeasureString(company_address, Heading);
        graphic.DrawString(company_address, font, new SolidBrush(Color.Black), (receipt_w - size.Width) / 2, startY + offset);

        offset = offset + (int)fontHeight + 5;

        size = graphic.MeasureString(company_phone, Heading);
        graphic.DrawString(company_phone, font, new SolidBrush(Color.Black), (receipt_w - size.Width) / 2, startY + offset);

        offset = offset + (int)fontHeight + 5;

        graphic.DrawString(underLine, font, new SolidBrush(Color.Black), startX, startY + offset);

        offset = offset + (int)fontHeight + 5;

        int total_rows = cart_pro_gv.RowCount;
        int recs = 1;

        foreach (DataGridViewRow row in cart_pro_gv.Rows) {

            if (recs < total_rows)
            {
                string pn = (null != row.Cells[1].Value) ? row.Cells[1].Value.ToString().Trim() : String.Empty;
                string pq = (null != row.Cells[2].Value) ? row.Cells[2].Value.ToString().Trim() : String.Empty;
                string pp = (null != row.Cells[3].Value) ? row.Cells[3].Value.ToString().Trim() : String.Empty;
                string ppt = (null != row.Cells[4].Value) ? row.Cells[4].Value.ToString().Trim() : String.Empty;


                string pline = string.Format("{0,-40}|{1,-15}|{2,-15}|{3,-15}", pn, pq, pp, ppt);
                //string pline = string.Format("{0}|{1}|{2}|{3}", pn.PadRight(30), pq.PadRight(30), pp.PadRight(30), ppt.PadRight(30));

                /*int padding = 3;
                int maxCol0width = pn.Length;
                int maxCol1width = pq.Length;
                int maxCol2width = pp.Length;
                int maxCol3width = ppt.Length;

                string fmt0 = "{0,-" + (maxCol0width + padding) + "}";
                string fmt1 = "{1,-" + (maxCol1width + padding) + "}";
                string fmt2 = "{2,-" + (maxCol2width + padding) + "}";
                string fmt3 = "{3,-" + (maxCol3width + padding) + "}";

                string fmt = fmt0 + fmt1 + fmt2 + fmt3;

                string pline = string.Format(fmt, pn, pq, pp, ppt);*/


                graphic.DrawString(pline, font, Brushes.Black, startX, startY + offset);
                offset = offset + (int)fontHeight + 5;
            }
            recs++;
        }

       // offset = offset + (int)fontHeight + 5;

        graphic.DrawString(underLine, font, Brushes.Black , startX, startY + offset);

        offset = offset + 10;
        string total_paying = "Net Total: " + cart_total_label.Text;
        graphic.DrawString(total_paying, font, new SolidBrush(Color.Black), startX, startY + offset);
    }

下面是我得到的输出：

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对齐问题是由左侧字符串的长度变化引起的。请注意，Perasilamole字符串是最短的字符串，因此数字最左边。我不太清楚你的代码是如何工作的，但也许你可以根据药物名称的长度改变药物名称后的空格数？我本来打算建议使用String.PadRight，但看起来你已经尝试过了。你在使用它时遇到了什么问题？马克，我很困惑它到底发生了什么，为什么它会采用这种观点。我理解，只是想找出你为什么注释掉String.PadRight行。如果您知道字段的长度，并且像您一样使用单间距字体，那么应该可以使用。显示的字体不是Courier，也不是单间距字体。