itextsharp 操作合并PDF文件

using System;using System.Collections;using System.ComponentModel;using System.Data;using System.Drawing;using System.Web;using System.Web.SessionState;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.HtmlControls;using System.IO;using System.Net;using System.Text;using iTextSharp.text;using iTextSharp.text.pdf;namespace WebApplication1{/// <summary>/// WebForm5 的摘要说明。/// </summary>public class WebForm5 : System.Web.UI.Page{protected System.Web.UI.WebControls.Button Button1;protected System.Web.UI.WebControls.Button btn;private void Page_Load(object sender, System.EventArgs e){// 在此处放置用户代码以初始化页面}#region Web 窗体设计器生成的代码override protected void OnInit(EventArgs e){//// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。//InitializeComponent();base.OnInit(e);}/// <summary>/// 设计器支持所需的方法 - 不要使用代码编辑器修改/// 此方法的内容。/// </summary>private void InitializeComponent(){    this.btn.Click += new System.EventHandler(this.btn_Click);this.Button1.Click += new System.EventHandler(this.Button1_Click);this.Load += new System.EventHandler(this.Page_Load);}#endregionprivate void btn_Click(object sender, System.EventArgs e){string[] pdflist = new string[3];pdflist[0] = "abc.pdf";pdflist[1] = "Chap0101.pdf";pdflist[2] = "Chap0102.pdf";mergePDFFiles(pdflist,"newpdf1.pdf");}/// <summary>/// 合并pdf文档/// </summary>/// <param name="fileList"></param>/// <param name="outMergeFile"></param>private void mergePDFFiles(string[] fileList,string outMergeFile){try{outMergeFile = Server.MapPath(outMergeFile);PdfReader reader;Document document = new Document();PdfWriter writer = PdfWriter.GetInstance(document,new FileStream(outMergeFile,FileMode.Create));document.Open();PdfContentByte cb = writer.DirectContent;PdfImportedPage newPage;for(int i = 0;i < fileList.Length;i++){     reader = new PdfReader(Server.MapPath(fileList[i]));int iPageNum = reader.NumberOfPages;for(int j=1;j<=iPageNum;j++){document.NewPage();newPage = writer.GetImportedPage(reader,j);cb.AddTemplate(newPage,0,0);      }}document.Close();}catch(Exception de){Response.Write(de.Message);  }}}}