PdfOperator/FrmMerge.cs

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using Spire.Pdf;
using System;
using System.Collections.Generic;
using System.IO;
using System.Windows.Forms;

namespace PdfOperator
{
    public partial class FrmMerge : Form
    {
        public FrmMerge()
        {
            InitializeComponent();
        }

        /// <summary>
        /// 选择要合并的PDF
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog openFiles = new OpenFileDialog();
            openFiles.Multiselect = true;
            openFiles.Filter = "pdf文件|*.pdf";
            if (openFiles.ShowDialog() == DialogResult.OK)
            {
                string[] filenames = openFiles.FileNames;
                Array.Sort(filenames);
                foreach (string filename in filenames)
                {
                    lstBoxFileList.Items.Add(filename);
                }
            }

        }

        /// <summary>
        /// 选择保存路径
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnSavePath_Click(object sender, EventArgs e)
        {
            if (lstBoxFileList.Items.Count < 1)
            {
                MessageBox.Show("请添加要合并的pdf文件！");
                return;
            }
            SaveFileDialog saveFile = new SaveFileDialog();
            saveFile.Title = "选择保存文件路径";
            saveFile.Filter = "pdf文件|.*pdf";
            saveFile.DefaultExt = ".pdf";
            saveFile.FileName = "合并的PDF1.pdf";
            if (saveFile.ShowDialog() == DialogResult.OK)
            {
                txtSavePath.Text = saveFile.FileName;
            }
        }