C # Add a text watermark

Using the itextsharp to add a PDF watermark, because it is the interface dynamically generated PDF, so the use is all the form of memory flow, and the watermark is tiled is. Itextsharp version is 5.5

1 /// <summary>2         ///add an oblique watermark3         /// </summary>4         /// <param name= "Pdfstream" >PDF file Stream</param>5         /// <param name= "Watermarkname" >Watermark String</param>6         /// <param name= "width" >Page Width</param>7         /// <param name= "height" >page Height</param>8          PublicMemoryStream Setwatermark (MemoryStream pdfstream,stringWatermarkname,floatWidthfloatheight)9         {Ten             Try One             { A                 intFontSize = -;//Set Font size -                 intspan = +;//Set Vertical Displacement -MemoryStream OutStream =NewMemoryStream (); thePdfreader Pdfreader =NewPdfreader (pdfstream); -Pdfstamper Pdfstamper =NewPdfstamper (Pdfreader, outstream); -PdfStamper.Writer.CloseStream =false; -                 intTotal = Pdfreader.numberofpages +1; + pdfcontentbyte content; -Basefont font = Basefont.createfont (@"C:\WINDOWS\Fonts\STCAIYUN. TTF", Basefont.identity_h, basefont.embedded);//Chinese Cloud Font +Pdfgstate GS =Newpdfgstate (); AGs. Fillopacity =0.15f;//Transparency at                 intWatermarknamelenth =watermarkname.length; -                 CharC; -                 intRise =0; -                 stringSpanstring =" ";//Horizontal Displacement -                  for(inti =1; I < total; i++) -                 { inRise = Watermarknamelenth *span; -Content = Pdfstamper.getovercontent (i);//Add a watermark above the content to                                                            //content = pdfstamper.getundercontent (i);//Add a watermark underneath the content + content. Setgstate (GS); - content. Begintext (); the content. Setcolorfill (basecolor.green); * content. Setfontandsize (font, fontSize); $                     intHeightnumbert = (int) Math.ceiling (decimal) Height/(decimal) rise);//the number of vertical repetitions, into the pitchPanax Notoginseng                     intPanlewith = (fontSize + span) *Watermarknamelenth; -                     intWidthnumber = (int) Math.ceiling (decimal) Width/(decimal) panlewith);//number of horizontal repetitions the                     +                     //set watermark text font tilt start A                      for(intW =0; W < Widthnumber; w++) the                     { +                          for(inth =1; H <= Heightnumbert; h++) -                         { $                             intYleng = rise *h; $Content. Settextmatrix (w * panlewith, Yleng);//x, Y sets the absolute left of the watermark to start with the lower left corner as the start of the X, Y axis -                              for(intK =0; K < Watermarknamelenth; k++) -                             { theContent. Settextrise (Yleng);//added at the specified y-axis value -c =Watermarkname[k];WuyiContent. Showtext (c +spanstring); theYleng-=span; -                             } Wu                         } -                     } About content. Endtext (); $                 } -                 if(Pdfstamper! =NULL) - pdfstamper.close (); -  A                 if(Pdfreader! =NULL) + pdfreader.close (); the  -                 returnOutStream; $             } the             Catch(Exception ex) the             { the                 Throwex; the             } -}

C # Add a text watermark