使用C#生成PDF文件流的代码案例分享

public byte[] DocCreate(System.Drawing.Image image, List<TreeNodes> list)

    {

      MemoryStream file = new MemoryStream();

      string fileName = string.Empty;

      Rectangle page = PageSize.A4;

      float y = page.Height;

      Document document = new Document(page, 15, 15, 30, 30);

      float docWidth = page.Width - 15 * 2;

      float docHeight = page.Height - document.BottomMargin - document.TopMargin;

      PdfWriter writer = PdfWriter.GetInstance(document, file);

      writer.CloseStream = false;

      writer.Open();

      PdfContentByte cb = writer.DirectContent;

      document.Open();

      //标题

      Paragraph title = new Paragraph(new Chunk("标题", titleFont));

      title.Alignment = Element.ALIGN_CENTER;

      document.Add(title);

      //图片

      iTextSharp.text.Image img = iTextSharp.text.Image.GetInstance(image, ImageFormat.Png);

      float widthSzie = (page.Width - 30) / img.Width;

      if (widthSzie < 1)

      {

        img.ScalePercent(widthSzie * 100);

      }

      document.Add(img);

      //文献出处

      Paragraph p2 = new Paragraph(new Chunk("出处", paragraphFont));

      p2.IndentationLeft = indentationLeft;

      document.Add(p2);

      InitData(list);//初始化业务数据

      CreateSteps(list, document, list.FirstOrDefault(it => it.PID == 0));//添加业务数据

      ////添加印章

      //iTextSharp.text.Image whyz = iTextSharp.text.Image.GetInstance(whyzPath);

      //whyz.ScalePercent(50);

      //whyz.PaddingTop = 100;

      //whyz.Alignment = Element.ALIGN_RIGHT;

      //document.Add(whyz);

      //添加日期

      Paragraph createtime = new Paragraph(new Chunk(DateTime.Now.ToLongDateString().ToString(), bodyFont));

      createtime.Alignment = Element.ALIGN_RIGHT;

      //createtime.SpacingBefore = -80;

      createtime.PaddingTop = 200;

      document.Add(createtime);

      document.Close();

      file.Position = 0;

      MemoryStream newfile = SetWaterMark(file, "水印内容", docWidth, docHeight);//添加水印，见另外一篇博客

      newfile.Position = 0;//重置流指针位置

      byte[] bytes = new byte[newfile.Length];

      newfile.Read(bytes, 0, bytes.Length);

      return bytes;

    }