遍历文件夹及其子文件夹下的.pdf文件，并解压文件夹下所有的压缩包

  List<PDFPATH> pdfpath = new List<PDFPATH>();
        List<string> ziplist = new List<string>();
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            FolderBrowserDialog dialog = new FolderBrowserDialog();
            dialog.Description = "请选择文件路径";
            if (dialog.ShowDialog() == DialogResult.OK)
            {
                string foldPath = dialog.SelectedPath;
                ListFilesZIPandRaR(new DirectoryInfo(foldPath));
                foreach (string p in ziplist)
                {
                    UnpackFile(p, p.Substring(0,p.LastIndexOf('\\')));
                }

                ListFilesPDF(new DirectoryInfo(foldPath));
                dataGridView1.DataSource = pdfpath;
            }

        }
        /// <summary>
        /// 获取文件夹及其子文件夹下的所有pdf
        /// </summary>
        /// <param name="info"></param>
        public void  ListFilesPDF(FileSystemInfo info)
        {

            if (!info.Exists) return;

            DirectoryInfo dir = info as DirectoryInfo;
            //不是目录
            if (dir == null) return;

            FileSystemInfo[] files = dir.GetFileSystemInfos();
            for (int i = 0; i < files.Length; i++)
            {
                FileInfo file = files[i] as FileInfo;
                //是文件
                if (file != null)
                {
                    //Console.WriteLine(file.FullName + "\t " + file.Length);
                    if (file.FullName.Substring(file.FullName.LastIndexOf(".")) == ".pdf")
                    //此处为显示JPG格式，不加IF可遍历所有格式的文件
                    {
                        PDFPATH p = new PDFPATH();
                        p.path = file.FullName;
                        pdfpath.Add(p );
                    }

                }
                //对于子目录，进行递归调用
                else
                {
                    ListFilesPDF(files[i]);
                }

            }

        }

        /// <summary>
        /// 获取文件夹及其子文件夹下的所有ZIP,RaR
        /// </summary>
        /// <param name="info"></param>
        public void ListFilesZIPandRaR(FileSystemInfo info)
        {

            if (!info.Exists) return;

            DirectoryInfo dir = info as DirectoryInfo;
            //不是目录
            if (dir == null) return;

            FileSystemInfo[] files = dir.GetFileSystemInfos();
            for (int i = 0; i < files.Length; i++)
            {
                FileInfo file = files[i] as FileInfo;
                //是文件
                if (file != null)
                {
                    //Console.WriteLine(file.FullName + "\t " + file.Length);
                    if (file.FullName.Substring(file.FullName.LastIndexOf(".")) == ".zip" || file.FullName.Substring(file.FullName.LastIndexOf(".")) == ".rar")
                    //此处为显示JPG格式，不加IF可遍历所有格式的文件
                    {
                        ziplist.Add(file.FullName);
                    }

                }
                //对于子目录，进行递归调用
                else
                {
                    ListFilesZIPandRaR(files[i]);
                }

            }

        }
        #region 解压 文件 zip 格式 rar 格式
        /// <summary>
        ///解压文件
        /// </summary>
        /// <param name="fileFromUnZip">解压前的文件路径（绝对路径）</param>
        /// <param name="fileToUnZip">解压后的文件目录（绝对路径）</param>
        public static void UnpackFile(string fileFromUnZip, string fileToUnZip)
        {

            //获取压缩类型
            string unType = fileFromUnZip.Substring(fileFromUnZip.LastIndexOf(".") + 1, 3).ToLower();
            switch (unType)
            {
                case "rar":
                    UnRar(fileFromUnZip, fileToUnZip);
                    break;
                case "zip":
                    UnZip(fileFromUnZip, fileToUnZip);
                    break;
            }
        }
        //解压rar格式的文件
        private static void UnRar(string fileFromUnZip, string fileToUnZip)
        {
            using (Process Process1 = new Process())// 开启一个进程 执行解压工作
            {
                string ServerDir = @"C:\Program Files (x86)\HaoZip\HaoZip.exe";//rar工具的安装路径   必须要安装 WinRAR     //例于：C:\Program Files (x86)\WinRAR\RAR.exe
                Process1.StartInfo.UseShellExecute = false;
                Process1.StartInfo.RedirectStandardInput = true;
                Process1.StartInfo.RedirectStandardOutput = true;
                Process1.StartInfo.RedirectStandardError = true;
                Process1.StartInfo.CreateNoWindow = true;
                Process1.StartInfo.FileName = ServerDir;
                Process1.StartInfo.Arguments = " x -inul -y " + fileFromUnZip + " " + fileToUnZip;
                Process1.Start();//解压开始
                Process1.WaitForExit();
                Process1.Close();
            }
        }
        // 解压zip 文件
        public static void UnZip(string fileFromUnZip, string fileToUnZip)
        {
            ZipInputStream inputStream = new ZipInputStream(File.OpenRead(fileFromUnZip));
            ZipEntry theEntry;
            while ((theEntry = inputStream.GetNextEntry()) != null)
            {
                fileToUnZip += "/";
                string fileName = Path.GetFileName(theEntry.Name);
                string path = Path.GetDirectoryName(fileToUnZip) + "\\";
                // Directory.CreateDirectory(path);//生成解压目录
                if (fileName != String.Empty)
                {
                    FileStream streamWriter = File.Create(path + fileName);//解压文件到指定的目录
                    int size = 2048;
                    byte[] data = new byte[2048];
                    while (true)
                    {
                        size = inputStream.Read(data, 0, data.Length);
                        if (size > 0)
                        {
                            streamWriter.Write(data, 0, size);
                        }
                        else
                        {
                            break;
                        }
                    }
                    streamWriter.Close();
                }
            }
            inputStream.Close();
        }
        #endregion

        private void Form1_Load(object sender, EventArgs e)
        {

        }

    }
    public class PDFPATH
    {
        public string path { get; set; }
    }