using System;

 using System.Collections.Generic;

 using System.Data;

 using System.Diagnostics;

 using System.IO;

 using System.Linq;

 using System.Web;

 using iTextSharp.text;

 using iTextSharp.text.pdf;

 using iTextSharp.text.html;

 using iTextSharp.text.xml;

 using System.Configuration;

 namespace WorkFlow

 {

     public class ReportHelper

     {

         public static string  ConvertToPDF(string content)

         {

             string s = string.Empty;

             string sPwd = string.Empty;

             StringReader sr = new StringReader(content);

             //定义一个Document，并设置页面大小为A4，竖向

             Document document = new Document(PageSize.A4);

             string sMapPath = HttpContext.Current.Server.MapPath(GetWebMailKeyValue()) + @"\";

             string sFileName = "Report" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".pdf";

             try

             {

                 DirectoryInfo info = new DirectoryInfo(sMapPath);

                 if (!info.Exists)

                 {

                     info.Create();

                 }

                 PdfWriter writer = PdfWriter.GetInstance(document, new FileStream(sMapPath + sFileName, FileMode.Create));

                 #region 载入亚洲字体资源，无此操作的话，不能显示包括中文、日文、韩文等内容

                 BaseFont.AddToResourceSearch("iTextAsian.dll");

                 BaseFont.AddToResourceSearch("iTextAsianCmaps.dll");

                 BaseFont bf = BaseFont.CreateFont("C:/WINDOWS/Fonts/SIMYOU.TTF", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);

                 #endregion

                 //生成水印

                 writer.PageEvent = new PdfEventHanler("@JTSJMZT", bf);

                 //处理密码

                 if (string.IsNullOrEmpty(sPwd))

                 {

                     Random r = new Random();

                     sPwd = r.Next(, ).ToString();

                 }

                 //将密码存入数据库

                 //sPwd

                 //加密

                 writer.SetEncryption(PdfWriter.STRENGTH128BITS, sPwd, null, PdfWriter.AllowPrinting);

                 //打开document

                 document.Open();

                 //写入一个段落, Paragraph

                 //List<IElement> htmlarraylist = iTextSharp.text.html.simpleparser.HTMLWorker.ParseToList(sr, null).ToArray().ToList<IElement>();

                 //for (int k = 0; k < htmlarraylist.Count; k++)

                 //    document.Add(htmlarraylist[k]);

                 //Paragraph mypara = new Paragraph();

                 //document.Add(mypara);

                 document.Add(new Paragraph(content, new Font(bf, )));

                 //关闭document

                 document.Close();

                 s = sFileName;

                 //打开PDF，看效果

                 //Process.Start(s);

                 //Blob Storage

                 //var location = AppDomain.CurrentDomain.BaseDirectory;

                 //uploadPath = location + "/";

                 //doc.Save(uploadPath + sFileName);

                 //BlobClient.AddBlob(DANCode1Config.EmailFileContainer, "MailExportAttachment1/" + sFileName, uploadPath, sFileName);

                 //uploadPath = GetWebMailURL() + "MailExportAttachment1/" + sFileName;

                 //s = "{\"message\":true,\"value\":\"" + s + "\"}";

             }

             catch (Exception ex)

             {

                 s= ex.Message;

             }

             return s;

         }

         public static string GetWebMailURL()

         {

             string s = ConfigurationManager.AppSettings["MailBlobStorage"].ToString();

             return s;

         }

         public static string GetWebMailKeyValue()

         {

             string s = ConfigurationManager.AppSettings["PDFExport"].ToString();

             return s;

         }

     }

     internal class PdfEventHanler : PdfPageEventHelper

     {

         string m_WatermaskText;

         BaseFont m_WatermaskTextFont;

         /// <summary>

         ///

         /// </summary>

         /// <param name="watermaskText">水印文字的内容</param>

         /// <param name="watermaskTextFont">水印文字的字体</param>

         public PdfEventHanler(string watermaskText,

      BaseFont watermaskTextFont)

         {

             m_WatermaskText = watermaskText;

             m_WatermaskTextFont = watermaskTextFont;

         }

         /// <summary>

         /// 在Page End事件中，添加页面水印，此事件在每页均会发生

         /// </summary>

         /// <param name="writer"></param>

         /// <param name="document"></param>

         public override void OnEndPage(PdfWriter writer,

     Document document)

         {

             PdfGState gstate = new PdfGState();

             gstate.FillOpacity = 0.2f; //设置灰度和透明度

             gstate.StrokeOpacity = 0.2f;

             //水印内容，必须放置在底层

             PdfContentByte wm = writer.DirectContentUnder;

             wm.SaveState();

             wm.SetGState(gstate);

             #region 给页面添加文字水印

             wm.SetFontAndSize(m_WatermaskTextFont, );

             wm.BeginText();

             wm.ShowTextAligned(Element.ALIGN_CENTER, m_WatermaskText,

     document.PageSize.Width / , document.PageSize.Height / , -35f);

             wm.EndText();

             #endregion

             wm.RestoreState();

             base.OnEndPage(writer, document);

         }

     }

 }