基于C#实现PDF文件合并工具

using system;
using system.collections.generic;
using system.componentmodel;
using system.data;
using system.diagnostics;
using system.drawing;
using system.io;
using system.linq;
using system.text;
using system.threading.tasks;
using system.windows.forms;
using itextsharp.text;
using itextsharp.text.pdf;
//using pdfsharp.pdf;
//using pdfsharp.pdf.io;
 
namespace pdfmergeapp
{
    public partial class form1 : form
    {
        public form1()
        {
            initializecomponent();
            btnopendir.enabled = false;
        }
 
        private list<string> pdflist;
        private string outputpdfdir;
 
        private void bntselectdir_click(object sender, eventargs e)
        {
            folderbrowserdialog folderbrowserdialog = new folderbrowserdialog();
            dialogresult dialogresult = folderbrowserdialog.showdialog();
 
            if (dialogresult == dialogresult.ok)
            {
                string selectedfolderpath = folderbrowserdialog.selectedpath;
                //console.writeline("选择的目录是: " + selectedfolderpath);
                txtfiledir.text = selectedfolderpath;
 
                pdflist = directory.getfiles(selectedfolderpath, "*.pdf").tolist();
 
                if (pdflist != null && pdflist.count > 0)
                {
                    pdflist = pdflist.orderby(t => t).tolist();
                }
 
                addpdflist();
            }
        }
 
        private void addpdflist()
        {
            this.listviewworklogs.items.clear();
            int no = 1;
            foreach (var item in pdflist)
            {
                listviewitem lvitem = new listviewitem();
 
                lvitem.forecolor = color.blue;
                lvitem.text = no.tostring();
                lvitem.stateimageindex = 0;
                lvitem.tag = no - 1;
                lvitem.subitems.add(item);
 
                this.listviewworklogs.items.add(lvitem);
                no++;
            }
        }
 
        /// <summary>
        /// 合并多个pdf文件为一个pdf文件
        /// </summary>
        /// <param name="inputfolderpath"></param>
        /// <param name="outputfolderpath"></param>
        /// <param name="outputpdfname"></param>
        public void mergepdfs(string outputfilepath, params string[] inputfilepaths)
        {
            // 获取输入文件夹中所有的pdf文件  
            //string[] inputfiles = directory.getfiles(inputfolderpath, "*.pdf");
 
            // 创建输出pdf文件路径  
            //string outputpdfpath = path.combine(outputfolderpath, outputpdfname);
 
            // 检查新输出文件是否已存在  
            if (file.exists(outputfilepath))
            {
                // 如果已存在，则删除旧文件并创建新文件  
                file.delete(outputfilepath);
            }
 
            // 创建输出pdf文件  
            using (filestream stream = new filestream(outputfilepath, filemode.create))
            {
                document pdfdoc = new document();
                pdfcopy pdf = new pdfcopy(pdfdoc, stream);
                pdfdoc.open();
 
                foreach (string file in inputfilepaths)
                {
                    // 读取每个pdf文件并将其页面添加到输出pdf中  
                    pdfreader reader = new pdfreader(file);
                    int n = reader.numberofpages;
                    for (int i = 1; i <= n; i++)
                    {
                        pdf.addpage(pdf.getimportedpage(reader, i));
                    }
                    reader.close();
                }
 
                if (pdfdoc != null) pdfdoc.close();
                stream.close();
            }
        }
 
        /// <summary>
        /// 合并多个pdf文件为一个pdf文件
        /// </summary>
        /// <param name="inputfolderpath"></param>
        /// <param name="outputfolderpath"></param>
        /// <param name="outputpdfname"></param>
        public void mergepdfs(string inputfolderpath, string outputfolderpath, string outputpdfname)
        {
            // 获取输入文件夹中所有的pdf文件  
            string[] inputfiles = directory.getfiles(inputfolderpath, "*.pdf");
 
            // 创建输出pdf文件路径  
            string outputpdfpath = path.combine(outputfolderpath, outputpdfname);
 
            outputpdfpath.createdirectorybypath();
 
            // 创建输出pdf文件  
            using (filestream stream = new filestream(outputpdfpath, filemode.create))
            {
                document pdfdoc = new document();
                pdfcopy pdf = new pdfcopy(pdfdoc, stream);
                pdfdoc.open();
 
                foreach (string file in inputfiles)
                {
                    // 读取每个pdf文件并将其页面添加到输出pdf中  
                    pdfreader reader = new pdfreader(file);
                    int n = reader.numberofpages;
                    for (int i = 1; i <= n; i++)
                    {
                        pdf.addpage(pdf.getimportedpage(reader, i));
                    }
                    reader.close();
                }
 
                if (pdfdoc != null) pdfdoc.close();
                stream.close();
            }
 
            string newoutputpdfpath = path.combine(outputfolderpath, "allpdf_merged.pdf");
            //string newoutputpdfpath = path.combine(outputfolderpath, outputpdfname);
 
            // 检查新输出文件是否已存在  
            if (file.exists(newoutputpdfpath))
            {
                // 如果已存在，则删除旧文件并创建新文件  
                file.delete(newoutputpdfpath);
            }
 
            // 重命名输出pdf文件  
            file.move(outputpdfpath, newoutputpdfpath);
        }
 
        /// <summary>
        /// 合并多个pdf文件为一个pdf文件
        /// </summary>
        /// <param name="inputfolderpath"></param>
        /// <param name="outputfolderpath"></param>
        /// <param name="outputpdfname"></param>
        public bool mergepdfs(string outputfolderpath, string outputpdfname)
        {
            var isok = false;
            try
            {
                // 获取输入文件夹中所有的pdf文件  
                //string[] inputfiles = directory.getfiles(inputfolderpath, "*.pdf");
 
                // 创建输出pdf文件路径  
                string outputpdfpath = path.combine(outputfolderpath, outputpdfname);
 
                outputpdfpath.createdirectorybypath();
 
                // 创建输出pdf文件  
                using (filestream stream = new filestream(outputpdfpath, filemode.create))
                {
                    document pdfdoc = new document();
                    pdfcopy pdf = new pdfcopy(pdfdoc, stream);
                    pdfdoc.open();
 
                    foreach (string file in pdflist)
                    {
                        // 读取每个pdf文件并将其页面添加到输出pdf中  
                        pdfreader reader = new pdfreader(file);
                        int n = reader.numberofpages;
                        for (int i = 1; i <= n; i++)
                        {
                            pdf.addpage(pdf.getimportedpage(reader, i));
                        }
                        reader.close();
                    }
 
                    if (pdfdoc != null) pdfdoc.close();
                    stream.close();
                }
 
                string newoutputpdfpath = path.combine(outputfolderpath, "allpdf_merged.pdf");
                //string newoutputpdfpath = path.combine(outputfolderpath, outputpdfname);
 
                // 检查新输出文件是否已存在  
                if (file.exists(newoutputpdfpath))
                {
                    // 如果已存在，则删除旧文件并创建新文件  
                    file.delete(newoutputpdfpath);
                }
 
                // 重命名输出pdf文件  
                file.move(outputpdfpath, newoutputpdfpath);
                isok = true;
            }
            catch (exception ex)
            {
                messagebox.show("合并异常:" + ex.message);
            }
            return isok;
        }
 
        private void btnmergepdf_click(object sender, eventargs e)
        {
            if (pdflist != null && pdflist.count > 0)
            {
                var outputfilepath = txtfiledir.text + "\\mergepdf_" + datetime.now.tostring("yyyymmddhhmmss") + ".pdf";
                //mergepdfs(outputfilepath, pdflist.toarray());
 
                var outputpdfname = "mergepdf_" + datetime.now.tostring("yyyymmddhhmmss") + ".pdf";
                var outputpdfnameall = txtfiledir.text + "\\mergepdf\\" + outputpdfname;
                outputpdfdir = txtfiledir.text + "\\mergepdf";
                //mergepdfs(txtfiledir.text, txtfiledir.text+ "\\mergepdf", outputpdfname);
                var isok = mergepdfs(outputpdfdir, outputpdfname);
                if (isok)
                {
                    lblresult.text = "合并完成。输出文件目录:" + outputpdfnameall;
                    btnopendir.enabled = true;
                    messagebox.show("合并完成");
                }                
            }
            else
            {
                messagebox.show("你没有要合并的pdf文件");
            }
        }
 
        private void btnopendir_click(object sender, eventargs e)
        {
            if (!string.isnullorempty(outputpdfdir))
            {
                opendirectory(outputpdfdir);
            }
            else
            {
                messagebox.show("合并文件没有生成");
            }
        }
 
        static void opendirectory(string path)
        {
            processstartinfo startinfo = new processstartinfo
            {
                arguments = path,
                filename = "explorer.exe"
            };
 
            process.start(startinfo);
        }
 
        private void listviewworklogs_itemcheck(object sender, itemcheckeventargs e)
        {
            var listviewitem = sender as listviewitem;
            var index = listviewitem.tag;
            var a = 0;
        }
 
        private int selectindex;
        private int newindex;
        //private string selectfilename;
 
        private void listviewworklogs_selectedindexchanged(object sender, eventargs e)
        {
            if (listviewworklogs.selecteditems.count > 0)
            {
                var listviewitem = listviewworklogs.selecteditems[0];
                selectindex = (int)listviewitem.tag;
                newindex = selectindex;
            }
        }
 
        
        private void btnmoveup_click(object sender, eventargs e)
        {
            if (pdflist != null && pdflist.count > 0)
            {
                newindex--;
                if (newindex >= 0 && newindex < pdflist.count)
                {
                    var selectfilename = pdflist[selectindex];
                    pdflist[selectindex] = pdflist[newindex];
                    pdflist[newindex] = selectfilename;
                    selectindex = newindex;
 
                    addpdflist();
                }
                else
                {
                    newindex = 0;
                }
            }
        }
 
        private void btnmovedown_click(object sender, eventargs e)
        {
            if (pdflist != null && pdflist.count > 0)
            {
                newindex++;
                if (newindex < pdflist.count)
                {
                    var selectfilename = pdflist[selectindex];
                    pdflist[selectindex] = pdflist[newindex];
                    pdflist[newindex] = selectfilename;
                    selectindex = newindex;
 
                    addpdflist();
                }
                else
                {
                    newindex = pdflist.count - 1;
                }
            }
        }
    }
}

 
namespace pdfmergeapp
{
    partial class form1
    {
        /// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private system.componentmodel.icontainer components = null;
 
        /// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
        protected override void dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.dispose();
            }
            base.dispose(disposing);
        }
 
        #region windows 窗体设计器生成的代码
 
        /// <summary>
        /// 设计器支持所需的方法 - 不要修改
        /// 使用代码编辑器修改此方法的内容。
        /// </summary>
        private void initializecomponent()
        {
            this.label1 = new system.windows.forms.label();
            this.txtfiledir = new system.windows.forms.textbox();
            this.button1 = new system.windows.forms.button();
            this.bntselectdir = new system.windows.forms.button();
            this.btnmergepdf = new system.windows.forms.button();
            this.groupbox1 = new system.windows.forms.groupbox();
            this.listviewworklogs = new system.windows.forms.listview();
            this.columnheader1 = ((system.windows.forms.columnheader)(new system.windows.forms.columnheader()));
            this.columnheader2 = ((system.windows.forms.columnheader)(new system.windows.forms.columnheader()));
            this.groupbox2 = new system.windows.forms.groupbox();
            this.lblresult = new system.windows.forms.label();
            this.btnopendir = new system.windows.forms.button();
            this.btnmoveup = new system.windows.forms.button();
            this.btnmovedown = new system.windows.forms.button();
            this.groupbox1.suspendlayout();
            this.groupbox2.suspendlayout();
            this.suspendlayout();
            // 
            // label1
            // 
            this.label1.autosize = true;
            this.label1.location = new system.drawing.point(12, 9);
            this.label1.name = "label1";
            this.label1.size = new system.drawing.size(75, 15);
            this.label1.tabindex = 0;
            this.label1.text = "选择目录:";
            // 
            // txtfiledir
            // 
            this.txtfiledir.location = new system.drawing.point(90, 6);
            this.txtfiledir.name = "txtfiledir";
            this.txtfiledir.readonly = true;
            this.txtfiledir.size = new system.drawing.size(491, 25);
            this.txtfiledir.tabindex = 1;
            // 
            // button1
            // 
            this.button1.location = new system.drawing.point(120, 141);
            this.button1.name = "button1";
            this.button1.size = new system.drawing.size(8, 8);
            this.button1.tabindex = 2;
            this.button1.text = "button1";
            this.button1.usevisualstylebackcolor = true;
            // 
            // bntselectdir
            // 
            this.bntselectdir.location = new system.drawing.point(600, 6);
            this.bntselectdir.name = "bntselectdir";
            this.bntselectdir.size = new system.drawing.size(118, 35);
            this.bntselectdir.tabindex = 3;
            this.bntselectdir.text = "选择目录";
            this.bntselectdir.usevisualstylebackcolor = true;
            this.bntselectdir.click += new system.eventhandler(this.bntselectdir_click);
            // 
            // btnmergepdf
            // 
            this.btnmergepdf.location = new system.drawing.point(724, 7);
            this.btnmergepdf.name = "btnmergepdf";
            this.btnmergepdf.size = new system.drawing.size(94, 32);
            this.btnmergepdf.tabindex = 3;
            this.btnmergepdf.text = "合并pdf";
            this.btnmergepdf.usevisualstylebackcolor = true;
            this.btnmergepdf.click += new system.eventhandler(this.btnmergepdf_click);
            // 
            // groupbox1
            // 
            this.groupbox1.controls.add(this.listviewworklogs);
            this.groupbox1.location = new system.drawing.point(15, 49);
            this.groupbox1.name = "groupbox1";
            this.groupbox1.size = new system.drawing.size(764, 589);
            this.groupbox1.tabindex = 4;
            this.groupbox1.tabstop = false;
            this.groupbox1.text = "文件列表";
            // 
            // listviewworklogs
            // 
            this.listviewworklogs.backcolor = system.drawing.systemcolors.inactivecaption;
            this.listviewworklogs.columns.addrange(new system.windows.forms.columnheader[] {
            this.columnheader1,
            this.columnheader2});
            this.listviewworklogs.dock = system.windows.forms.dockstyle.fill;
            this.listviewworklogs.fullrowselect = true;
            this.listviewworklogs.gridlines = true;
            this.listviewworklogs.headerstyle = system.windows.forms.columnheaderstyle.nonclickable;
            this.listviewworklogs.hideselection = false;
            this.listviewworklogs.imemode = system.windows.forms.imemode.nocontrol;
            this.listviewworklogs.labelwrap = false;
            this.listviewworklogs.location = new system.drawing.point(3, 21);
            this.listviewworklogs.multiselect = false;
            this.listviewworklogs.name = "listviewworklogs";
            this.listviewworklogs.size = new system.drawing.size(758, 565);
            this.listviewworklogs.tabindex = 2;
            this.listviewworklogs.usecompatiblestateimagebehavior = false;
            this.listviewworklogs.view = system.windows.forms.view.details;
            this.listviewworklogs.itemcheck += new system.windows.forms.itemcheckeventhandler(this.listviewworklogs_itemcheck);
            this.listviewworklogs.selectedindexchanged += new system.eventhandler(this.listviewworklogs_selectedindexchanged);
            // 
            // columnheader1
            // 
            this.columnheader1.text = "序号";
            this.columnheader1.width = 50;
            // 
            // columnheader2
            // 
            this.columnheader2.text = "文件名";
            this.columnheader2.width = 580;
            // 
            // groupbox2
            // 
            this.groupbox2.controls.add(this.lblresult);
            this.groupbox2.controls.add(this.btnopendir);
            this.groupbox2.location = new system.drawing.point(15, 644);
            this.groupbox2.name = "groupbox2";
            this.groupbox2.size = new system.drawing.size(809, 68);
            this.groupbox2.tabindex = 5;
            this.groupbox2.tabstop = false;
            this.groupbox2.text = "合并结果";
            // 
            // lblresult
            // 
            this.lblresult.autosize = true;
            this.lblresult.location = new system.drawing.point(17, 34);
            this.lblresult.name = "lblresult";
            this.lblresult.size = new system.drawing.size(55, 15);
            this.lblresult.tabindex = 0;
            this.lblresult.text = "label2";
            // 
            // btnopendir
            // 
            this.btnopendir.location = new system.drawing.point(709, 24);
            this.btnopendir.name = "btnopendir";
            this.btnopendir.size = new system.drawing.size(94, 32);
            this.btnopendir.tabindex = 3;
            this.btnopendir.text = "查看文件";
            this.btnopendir.usevisualstylebackcolor = true;
            this.btnopendir.click += new system.eventhandler(this.btnopendir_click);
            // 
            // btnmoveup
            // 
            this.btnmoveup.location = new system.drawing.point(785, 141);
            this.btnmoveup.name = "btnmoveup";
            this.btnmoveup.size = new system.drawing.size(33, 42);
            this.btnmoveup.tabindex = 6;
            this.btnmoveup.text = "上移";
            this.btnmoveup.usevisualstylebackcolor = true;
            this.btnmoveup.click += new system.eventhandler(this.btnmoveup_click);
            // 
            // btnmovedown
            // 
            this.btnmovedown.location = new system.drawing.point(785, 224);
            this.btnmovedown.name = "btnmovedown";
            this.btnmovedown.size = new system.drawing.size(33, 42);
            this.btnmovedown.tabindex = 6;
            this.btnmovedown.text = "下移";
            this.btnmovedown.usevisualstylebackcolor = true;
            this.btnmovedown.click += new system.eventhandler(this.btnmovedown_click);
            // 
            // form1
            // 
            this.autoscaledimensions = new system.drawing.sizef(8f, 15f);
            this.autoscalemode = system.windows.forms.autoscalemode.font;
            this.clientsize = new system.drawing.size(836, 724);
            this.controls.add(this.btnmovedown);
            this.controls.add(this.btnmoveup);
            this.controls.add(this.groupbox2);
            this.controls.add(this.groupbox1);
            this.controls.add(this.btnmergepdf);
            this.controls.add(this.bntselectdir);
            this.controls.add(this.button1);
            this.controls.add(this.txtfiledir);
            this.controls.add(this.label1);
            this.name = "form1";
            this.text = "pdf文件合并";
            this.groupbox1.resumelayout(false);
            this.groupbox2.resumelayout(false);
            this.groupbox2.performlayout();
            this.resumelayout(false);
            this.performlayout();
 
        }
 
        #endregion
 
        private system.windows.forms.label label1;
        private system.windows.forms.textbox txtfiledir;
        private system.windows.forms.button button1;
        private system.windows.forms.button bntselectdir;
        private system.windows.forms.button btnmergepdf;
        private system.windows.forms.groupbox groupbox1;
        private system.windows.forms.listview listviewworklogs;
        private system.windows.forms.columnheader columnheader1;
        private system.windows.forms.columnheader columnheader2;
        private system.windows.forms.groupbox groupbox2;
        private system.windows.forms.label lblresult;
        private system.windows.forms.button btnopendir;
        private system.windows.forms.button btnmoveup;
        private system.windows.forms.button btnmovedown;
    }
}