C# /.NET压缩解压文件夹及文件夹里面的子文件、文件夹

最近做一个项目需要压缩，解压文件夹及文件夹里面的子文件夹、文件，在网上找了许多资料，有两种实例：
实例一：

#region 压缩文件
        /// 递归压缩文件夹方法 
        private bool ZipFileDictory(string FolderToZip, ZipOutputStream s, string ParentFolderName)
        {
            bool res = true;
            string[] folders, filenames;
            ZipEntry entry = null;
            FileStream fs = null;
            Crc32 crc = new Crc32();

            try
            {

                //创建当前文件夹
                entry = new ZipEntry(Path.Combine(ParentFolderName, Path.GetFileName(FolderToZip) + "/")); //加上 “/” 才会当成是文件夹创建
                s.PutNextEntry(entry);
                s.Flush();


                //先压缩文件，再递归压缩文件夹 
                filenames = Directory.GetFiles(FolderToZip);
                foreach (string file in filenames)
                {
                    //打开压缩文件
                    fs = File.OpenRead(file);

                    byte[] buffer = new byte[fs.Length];
                    fs.Read(buffer, 0, buffer.Length);
                    entry = new ZipEntry(Path.Combine(ParentFolderName, Path.GetFileName(FolderToZip) + "/" + Path.GetFileName(file)));

                    entry.DateTime = DateTime.Now;
                    entry.Size = fs.Length;
                    fs.Close();

                    crc.Reset();
                    crc.Update(buffer);

                    entry.Crc = crc.Value;

                    s.PutNextEntry(entry);

                    s.Write(buffer, 0, buffer.Length);
                }
            }
            catch
            {
                res = false;
            }
            finally
            {
                if (fs != null)
                {
                    fs.Close();
                    fs = null;
                }
                if (entry != null)
                {
                    entry = null;
                }
                GC.Collect();
                GC.Collect(1);
            }


            folders = Directory.GetDirectories(FolderToZip);
            foreach (string folder in folders)
            {
                if (!ZipFileDictory(folder, s, Path.Combine(ParentFolderName, Path.GetFileName(FolderToZip))))
                {
                    return false;
                }
            }

            return res;
        }

        /// <summary>
        /// 压缩目录
        /// </summary>
        /// <param name="FolderToZip">待压缩的文件夹，全路径格式</param>
        /// <param name="ZipedFile">压缩后的文件名，全路径格式</param>
        /// <param name="Password"></param>
        /// <returns></returns>
        private bool ZipFileDictory(string FolderToZip, string ZipedFile, String Password)
        {
            bool res;
            if (!Directory.Exists(FolderToZip))
            {
                return false;
            }

            ZipOutputStream s = new ZipOutputStream(File.Create(ZipedFile));
            s.SetLevel(6);
            s.Password = Password;

            res = ZipFileDictory(FolderToZip, s, "");

            s.Finish();
            s.Close();

            return res;
        }

        /// <summary>
        /// 压缩文件
        /// </summary>
        /// <param name="FileToZip">要进行压缩的文件名</param>
        /// <param name="ZipedFile">压缩后生成的压缩文件名</param>
        /// <param name="Password"></param>
        /// <returns></returns>
        private bool ZipFile(string FileToZip, string ZipedFile, String Password)
        {
            //如果文件没有找到，则报错
            if (!File.Exists(FileToZip))
            {
                throw new System.IO.FileNotFoundException("指定要压缩的文件: " + FileToZip + " 不存在!");
            }
            //FileStream fs = null;
            FileStream ZipFile = null;
            ZipOutputStream ZipStream = null;
            ZipEntry ZipEntry = null;

            bool res = true;
            try
            {
                ZipFile = File.OpenRead(FileToZip);
                byte[] buffer = new byte[ZipFile.Length];
                ZipFile.Read(buffer, 0, buffer.Length);
                ZipFile.Close();

                ZipFile = File.Create(ZipedFile);
                ZipStream = new ZipOutputStream(ZipFile);
                ZipStream.Password = Password;
                ZipEntry = new ZipEntry(Path.GetFileName(FileToZip));
                ZipStream.PutNextEntry(ZipEntry);
                ZipStream.SetLevel(6);

                ZipStream.Write(buffer, 0, buffer.Length);
            }
            catch
            {
                res = false;
            }
            finally
            {
                if (ZipEntry != null)
                {
                    ZipEntry = null;
                }
                if (ZipStream != null)
                {
                    ZipStream.Finish();
                    ZipStream.Close();
                }
                if (ZipFile != null)
                {
                    ZipFile.Close();
                    ZipFile = null;
                }
                GC.Collect();
                GC.Collect(1);
            }

            return res;
        }

        /// <summary>
        /// 压缩文件 和 文件夹
        /// </summary>
        /// <param name="FileToZip">待压缩的文件或文件夹，全路径格式</param>
        /// <param name="ZipedFile">压缩后生成的压缩文件名，全路径格式</param>
        /// <param name="Password"></param>
        /// <returns></returns>
        private bool Zip(String FileToZip, String ZipedFile, String Password)
        {
            if (Directory.Exists(FileToZip))
            {
                return ZipFileDictory(FileToZip, ZipedFile, Password);
            }
            else if (File.Exists(FileToZip))
            {
                return ZipFile(FileToZip, ZipedFile, Password);
            }
            else
            {
                return false;
            }
        }
        #endregion

        #region 解压文件
        /// <summary>
        /// 解压功能(解压压缩文件到指定目录)
        /// </summary>
        /// <param name="FileToUpZip">待解压的文件</param>
        /// <param name="ZipedFolder">指定解压目标目录</param>
        /// <param name="Password"></param>
        private void UnZip(string FileToUpZip, string ZipedFolder, string Password)
        {
            if (!File.Exists(FileToUpZip))
            {
                return;
            }

            if (!Directory.Exists(ZipedFolder))
            {
                Directory.CreateDirectory(ZipedFolder);
            }

            ZipInputStream s = null;
            ZipEntry theEntry = null;

            string fileName;
            FileStream streamWriter = null;
            try
            {
                s = new ZipInputStream(File.OpenRead(FileToUpZip));
                s.Password = Password;
                while ((theEntry = s.GetNextEntry()) != null)
                {
                    if (theEntry.Name != String.Empty)
                    {
                        fileName = Path.Combine(ZipedFolder, theEntry.Name);
                        /**/
                        ///判断文件路径是否是文件夹
                        if (fileName.EndsWith("/") || fileName.EndsWith("\\"))
                        {
                            Directory.CreateDirectory(fileName);
                            continue;
                        }

                        streamWriter = File.Create(fileName);
                        int size = 2048;
                        byte[] data = new byte[2048];
                        while (true)
                        {
                            size = s.Read(data, 0, data.Length);
                            if (size > 0)
                            {
                                streamWriter.Write(data, 0, size);
                            }
                            else
                            {
                                break;
                            }
                        }
                    }
                }
            }
            finally
            {
                if (streamWriter != null)
                {
                    streamWriter.Close();
                    streamWriter = null;
                }
                if (theEntry != null)
                {
                    theEntry = null;
                }
                if (s != null)
                {
                    s.Close();
                    s = null;
                }
                GC.Collect();
                GC.Collect(1);
            }
        }
        #endregion

实例二：

#region 压缩文件方法二
        public void ZipFilenew(string strFileFolder, string strZip)
        {
            if (strFileFolder[strFileFolder.Length - 1] != Path.DirectorySeparatorChar)
                strFileFolder += Path.DirectorySeparatorChar;
            ZipOutputStream s = new ZipOutputStream(File.Create(strZip));
            s.SetLevel(6); // 0 - store only to 9 - means best compression
            zip(strFileFolder, strZip, s);
            s.Finish();
            s.Close();
        }

        private void zip(string strFile, string StoreFile, ZipOutputStream s)
        {
            if (strFile[strFile.Length - 1] != Path.DirectorySeparatorChar)
                strFile += Path.DirectorySeparatorChar;
            Crc32 crc = new Crc32();
            string[] filenames = Directory.GetFileSystemEntries(strFile);
            foreach (string file in filenames)
            {
                if (Directory.Exists(file))
                {
                    zip(file, StoreFile, s);

                }
                else
                {
                    //打开压缩文件,开始压缩
                    FileStream fs = File.OpenRead(file);
                    byte[] buffer = new byte[fs.Length];
                    fs.Read(buffer, 0, buffer.Length);
                    string tempfile = file.Substring(StoreFile.LastIndexOf("\\") + 1);
                    ZipEntry entry = new ZipEntry(tempfile);
                    entry.DateTime = DateTime.Now;
                    entry.Size = fs.Length;
                    fs.Close();
                    crc.Reset();
                    crc.Update(buffer);
                    entry.Crc = crc.Value;
                    s.PutNextEntry(entry);
                    s.Write(buffer, 0, buffer.Length);
                }
            }
        }
        #endregion

        #region 解压文件方法二
        public string unZipFile(string TargetFile, string fileDir)
        {
            string rootFile = " ";
            try
            {
                //读取压缩文件(zip文件)，准备解压缩
                ZipInputStream s = new ZipInputStream(File.OpenRead(TargetFile.Trim()));
                ZipEntry theEntry;
                string path = fileDir;
                //解压出来的文件保存的路径

                string rootDir = " ";
                //根目录下的第一个子文件夹的名称
                while ((theEntry = s.GetNextEntry()) != null)
                {
                    rootDir = Path.GetDirectoryName(theEntry.Name);
                    //得到根目录下的第一级子文件夹的名称
                    if (rootDir.IndexOf("\\") >= 0)
                    {
                        rootDir = rootDir.Substring(0, rootDir.IndexOf("\\") + 1);
                    }
                    string dir = Path.GetDirectoryName(theEntry.Name);
                    //根目录下的第一级子文件夹的下的文件夹的名称
                    string fileName = Path.GetFileName(theEntry.Name);
                    //根目录下的文件名称
                    if (dir != " ")
                    //创建根目录下的子文件夹,不限制级别
                    {
                        if (!Directory.Exists(fileDir + "\\" + dir))
                        {
                            path = fileDir + "\\" + dir;
                            //在指定的路径创建文件夹
                            Directory.CreateDirectory(path);
                        }
                    }
                    else if (dir == " " && fileName != "")
                    //根目录下的文件
                    {
                        path = fileDir;
                        rootFile = fileName;
                    }
                    else if (dir != " " && fileName != "")
                    //根目录下的第一级子文件夹下的文件
                    {
                        if (dir.IndexOf("\\") > 0)
                        //指定文件保存的路径
                        {
                            path = fileDir + "\\" + dir;
                        }
                    }

                    if (dir == rootDir)
                    //判断是不是需要保存在根目录下的文件
                    {
                        path = fileDir + "\\" + rootDir;
                    }

                    //以下为解压缩zip文件的基本步骤
                    //基本思路就是遍历压缩文件里的所有文件，创建一个相同的文件。
                    if (fileName != String.Empty)
                    {
                        FileStream streamWriter = File.Create(path + "\\" + fileName);

                        int size = 2048;
                        byte[] data = new byte[2048];
                        while (true)
                        {
                            size = s.Read(data, 0, data.Length);
                            if (size > 0)
                            {
                                streamWriter.Write(data, 0, size);
                            }
                            else
                            {
                                break;
                            }
                        }

                        streamWriter.Close();
                    }
                }
                s.Close();

                return rootFile;
            }
            catch (Exception ex)
            {
                return "1; " + ex.Message;
            }

        }
        #endregion

这里有个问题，实例二中的解压文件的时候，如果解压到的路径中存在解压文件中的文件，解压的时候不会覆盖，这点值得注意。
另外压缩解压文件要用到ICSharpCode.SharpZipLib.dll这个dll,网上可以搜到下载地址。