问PDFsharp:如何将下一个文本放在XTextFormatter之后？

EN

 var dy = 13;
 graphics.DrawString("Delivery Location: ", font, XBrushes.Black, new XPoint(20, 111));
 graphics.DrawString(comp_name, font, XBrushes.Black, new XPoint(20, 111+ dy));
 XRect rect = new XRect(20, 124, 200, 34);
 graphics.DrawRectangle(XBrushes.SeaShell, rect);
 tf.DrawString("This is just test. This is just test. This is just test. This is just test.",
 font,
 XBrushes.Black,
 new XRect(rect.X + 5, rect.Y, rect.Width - 5, 34), XStringFormats.TopLeft);
 graphics.DrawString("Phone Number: " + comp_phone1, font, XBrushes.Black, new XPoint(20, 136+ dy));
 graphics.DrawString("GST: " + comp_gst, font, XBrushes.Black, new XPoint(20, 149+ dy));
 graphics.DrawString("PAN: " + comp_pan, font, XBrushes.Black, new XPoint(20, 159+ dy));