如何使用C＃水印Pdf文件，下面是用于图像上的水印的代码，而不是我不想在Pdf文件上制作水印。请建议解决方案 [英] How To Watermark Pdf File Using C#?,Below Is The Code Used For Watermark On Image,Instead Of That I Wan't To Make Watermark On Pdf File.Please Suggest Solutions

问题描述

位图original_image =新位图（FileUpload1.FileContent）;

string sWaterMark =（string）s1;

int fontsize =（（ori​​ginal_image.Width * 2）/（sWaterMark.Length * 3））;

int x = original_image.Width / 2;

int y = original_image.Height * 9/20;

StringFormat drawFormat = new StringFormat（）;

drawFormat.Alignment = StringAlignment.Center;

drawFormat.FormatFlags = StringFormatFlags.NoWrap;

Graphics graphic = Graphics.FromImage（original_image）;

graphic.DrawString（ sWaterMark，new Font（Verdana，fontsize，FontStyle.Bold），新的SolidBrush（Color.FromArgb（80,255,255,255）），x，y，drawFormat）;

original_image。保存（MapPath（〜/+ newfolder +\\） + FileUpload1.FileName）;

if（original_image！= null）original_image.Dispose（）;

if（graphic！= null）graphic.Dispose（）;

解决方案

您需要第三方dll，例如 pdfsharp [< a href =http://pdfsharp.com/PDFsharp/target =_ blanktitle =New Window> ^ ]或 iTextSharp [ ^ ]为pdf添加水印

Bitmap original_image = new Bitmap(FileUpload1.FileContent);
string sWaterMark = (string)s1;
int fontsize = ((original_image.Width * 2) / (sWaterMark.Length * 3));
int x = original_image.Width / 2;
int y = original_image.Height * 9 / 20;
StringFormat drawFormat = new StringFormat();
drawFormat.Alignment = StringAlignment.Center;
drawFormat.FormatFlags = StringFormatFlags.NoWrap;
Graphics graphic = Graphics.FromImage(original_image);
graphic.DrawString(sWaterMark, new Font("Verdana", fontsize, FontStyle.Bold), new SolidBrush(Color.FromArgb(80, 255, 255, 255)), x, y, drawFormat);
original_image.Save(MapPath("~/" + newfolder + "\\") + FileUpload1.FileName);
if (original_image != null) original_image.Dispose();
if (graphic != null) graphic.Dispose();

解决方案

You'll need a 3rd party dll,such as pdfsharp[^] or iTextSharp[^] to watermark a pdf

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