使用Spire的C# merge pdf不编写内容

Question

我有下面的代码来合并不同的文档，并正确地创建一个pdf file.creates文件，但是没有在创建的文件上显示文档内容。它看起来像是创建了页码，但我看不到文档内容，它只是空白。这里错过了什么

private void buttonAdd_Click(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();

            ofd.Filter = "All files (*.docx, *.pdf, *.pptx, *.pdf)| *.docx; *.pdf; *.pptx; *.xlsx";

            ofd.Multiselect = true;

            if (DialogResult.OK == ofd.ShowDialog())

            {

                string[] files = ofd.FileNames;

                listBoxFiles.Items.AddRange(files);

            }
        }

这是文档合并代码

 private void buttonMerge_Click(object sender, EventArgs e)
        {
            //Convert other file formats to PDF file
            string ext = string.Empty;
            foreach (object item in listBoxFiles.Items)
            {
                ext = Path.GetExtension(item.ToString());
                switch (ext)
                {
                    case ".docx":
                        using (MemoryStream ms = new MemoryStream())
                        {
                            Document doc = new Document(item.ToString());
                            doc.SaveToStream(ms, Spire.Doc.FileFormat.PDF);
                            PdfFiles.Add(new PdfDocument(ms));
                        }
                        break;
                    case ".pdf":
                        PdfFiles.Add(new PdfDocument(item.ToString()));
                        break;
                    case ".pptx":
                        using (MemoryStream ms = new MemoryStream())
                        {
                            Presentation ppt = new Presentation(item.ToString(), Spire.Presentation.FileFormat.Auto);
                            ppt.SaveToFile(ms, Spire.Presentation.FileFormat.PDF);
                            PdfFiles.Add(new PdfDocument(ms));
                        }
                        break;
                    case ".xlsx":
                        using (MemoryStream ms = new MemoryStream())
                        {
                            Workbook xls = new Workbook();
                            xls.LoadFromFile(item.ToString());
                            xls.SaveToStream(ms, Spire.Xls.FileFormat.PDF);
                            PdfFiles.Add(new PdfDocument(ms));
                        }
                        break;
                    default:
                        break;
                }
            }
            //Merge the PDF files into one PDF
            PdfDocument newPdf1 = new PdfDocument();
            foreach (PdfDocument doc in PdfFiles)
            {
                newPdf1.AppendPage(doc);
            }
            //Create a new PDF with specified page size, copy the content of merged file to new PDF file
            PdfDocument newPdf2 = new PdfDocument();
            foreach (PdfPageBase page in newPdf1.Pages)
            {
                PdfPageBase newPage = newPdf2.Pages.Add(PdfPageSize.A4, new PdfMargins(0));
                PdfTextLayout loLayout = new PdfTextLayout();
                loLayout.Layout = PdfLayoutType.OnePage;
                page.CreateTemplate().Draw(newPage, new PointF(0, 0), loLayout);
            }
            //Save the destination PDF file
            SaveFileDialog sfd = new SaveFileDialog();
            sfd.Filter = "Pdf files(*.pdf)|*.pdf";
            if (DialogResult.OK == sfd.ShowDialog())
            {
                newPdf2.SaveToFile(sfd.FileName);
            }
        }

Answer 1

您应该使用新的合并方法而不是旧的合并方法。请检查以下代码：

using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Windows.Forms;
using Spire.Doc;
using Spire.Pdf;
using Spire.Pdf.Graphics;
using Spire.Presentation;
using Spire.Xls;

namespace Merge_Office_Files_to_PDF
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
    private void button1_Click(object sender, EventArgs e)
    {
        OpenFileDialog ofd = new OpenFileDialog();

        ofd.Filter = "All files (*.docx, *.pdf, *.pptx, *.pdf)| *.docx; *.pdf; *.pptx; *.xlsx";

        ofd.Multiselect = true;

        if (DialogResult.OK == ofd.ShowDialog())
        {

            string[] files = ofd.FileNames;

            listBox1.Items.AddRange(files);
        }
    }

    private void button2_Click(object sender, EventArgs e)
    {

        string ext = string.Empty;
        List<Stream> filesStreams = new List<Stream>();
        MemoryStream ms1 = new MemoryStream();
        MemoryStream ms2 = new MemoryStream();
        MemoryStream ms3 = new MemoryStream();
        foreach (object item in listBox1.Items)
        {
            ext = Path.GetExtension(item.ToString());
            switch (ext)
            {
                case ".docx":
                    Document doc = new Document(item.ToString());
                    doc.SaveToStream(ms1, Spire.Doc.FileFormat.PDF);
                    filesStreams.Add(ms1);

                    break;
                case ".pdf":
                    filesStreams.Add(File.OpenRead(item.ToString()));
                    break;
                case ".pptx":
                    Presentation ppt = new Presentation(item.ToString(), Spire.Presentation.FileFormat.Auto);
                    ppt.SaveToFile(ms2, Spire.Presentation.FileFormat.PDF);
                    filesStreams.Add(ms2);

                    break;
                case ".xlsx":
                    Workbook xls = new Workbook();
                    xls.LoadFromFile(item.ToString());
                    xls.SaveToStream(ms3, Spire.Xls.FileFormat.PDF);
                    filesStreams.Add(ms3);

                    break;
                default:
                    break;

            }
        }
        string outputFile = "result.pdf";
        PdfDocumentBase result = PdfDocument.MergeFiles(filesStreams.ToArray());
        result.Save(outputFile, Spire.Pdf.FileFormat.PDF);
        ms1.Close();
        ms2.Close();
        ms3.Close();            
    }
}