C#解压或压缩文件夹

最近要做一个项目涉及到C#中压缩与解压缩的问题的解决方法，大家分享。
这里主要解决文件夹包含文件夹的解压缩问题。
1）下载SharpZipLib.dll，在http://www.icsharpcode.net/OpenSource/SharpZipLib/Download.aspx中有最新免费版本，“Assemblies for .NET 1.1, .NET 2.0, .NET CF 1.0, .NET CF 2.0: Download [297 KB] ”点击Download可以下载，解压后里边有好多文件夹，因为不同的版本，我用的FW2.0。
2）引用SharpZipLib.dll，在项目中点击项目右键-->添加引用-->浏览，找到要添加的DLL-->确认

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using ICSharpCode.SharpZipLib;
using ICSharpCode.SharpZipLib.Checksums;
using ICSharpCode.SharpZipLib.Zip;

/*
 * http://www.icsharpcode.net/OpenSource/SharpZipLib/ 下载ICSharpCode.SharpZipLib
* 解压缩
* 该程序压缩和解压配合才能使用
* 普通用 Winrar 压缩的文件该解压不能通过
*/
namespace ZipApplication
{

    #region ZipClass

    /// <summary>
    /// 压缩类
    /// </summary>
    public class ZipClass
    {

        #region ZipFileDictory

        /// <summary>
        /// 递归压缩文件夹方法
        /// </summary>
        /// <param name="FolderToZip"></param>
        /// <param name="s"></param>
        /// <param name="ParentFolderName"></param>
        private static 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;
        }

        #endregion


        #region ZipFileDictory

        /// <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>
        /// <returns></returns>
        private static 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);
            if(!string.IsNullOrEmpty(Password.Trim()))
                s.Password = Password.Trim();
            res = ZipFileDictory(FolderToZip, s, "");
            s.Finish();
            s.Close();
            return res;
        }

        #endregion

        #region ZipFile

        /// <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>
        /// <returns></returns>
        private static 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);
                if(!string.IsNullOrEmpty(Password.Trim()))
                    ZipStream.Password = Password.Trim();
                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;
        }

        #endregion

        #region Zip

        /// <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">压缩密码</param>
        /// <returns></returns>
        public static 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;
            }
        }

        /// <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>
        /// <returns></returns>
        public static bool Zip(string FileToZip, string ZipedFile)
        {
            return Zip(FileToZip, ZipedFile, "");
        }

        #endregion
    }

    #endregion


    #region UnZipClass

    /// <summary>
    ///  解压类
    /// </summary>
    public class UnZipClass
    {

        #region UnZip

        /// <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">指定解压密码</param>
        public static void UnZip(string FileToUpZip, string ZipedFolder, string Password)
        {
            if (!File.Exists(FileToUpZip))
                return;

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


            using (ZipInputStream s = new ZipInputStream(File.OpenRead(FileToUpZip)))
            {

                if (!string.IsNullOrEmpty(Password.Trim()))
                    s.Password = Password.Trim();

                ZipEntry theEntry;

                int size = 2048;
                long fszie;
                int byteLenght;
                

                while ((theEntry = s.GetNextEntry()) != null)
                {
                    
                    System.Windows.Forms.MessageBox.Show(s.Length.ToString());
                    //Console.WriteLine(theEntry.Name);

                    string directoryName = Path.GetDirectoryName(theEntry.Name);
                    string fileName = Path.GetFileName(theEntry.Name);

                    // create directory
                    if (directoryName.Length > 0)
                    {
                        Directory.CreateDirectory(directoryName);
                    }

                    if (fileName != String.Empty)
                    {
                        fszie = theEntry.Size;
                        using (FileStream streamWriter = File.Create(theEntry.Name))
                        {
                            while (fszie > 0)
                            {
                                if (fszie > (long)size)
                                    byteLenght = size;
                                else
                                    byteLenght = Convert.ToInt32(fszie);
                                fszie = fszie - size;
                                byte[] data = new byte[byteLenght];
                                s.Read(data, 0, byteLenght);
                                streamWriter.Write(data, 0, byteLenght);
                            }
                        }
                    }
                }
            }



            //ZipInputStream s = null;
            //ZipEntry theEntry = null;

            //string fileName;
            //FileStream streamWriter = null;
            //try
            //{
            //    s = new ZipInputStream(File.OpenRead(FileToUpZip));
            //    if (!string.IsNullOrEmpty(Password.Trim()))
            //        s.Password = Password.Trim();

            //    int size = 2048;
            //    long fszie;
            //    int byteLenght;

                

            //    while ((theEntry = s.GetNextEntry()) != null)
            //    {
            //        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);
            //        fszie = theEntry.Size;
            //        if (fszie > 0)
            //        {
            //            while (fszie > 0)
            //            {
            //                if (fszie > (long)size)
            //                    byteLenght = size;
            //                else
            //                    byteLenght = Convert.ToInt32(fszie);
            //                fszie = fszie - size;
            //                byte[] data = new byte[byteLenght];
            //                s.Read(data, 0, byteLenght);
            //                streamWriter.Write(data, 0, byteLenght);
            //            }
            //        }
            //    }
            //}
            //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);
            //}
        }


        /// <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>
        public static void UnZip(string FileToUpZip, string ZipedFolder)
        {
            UnZip(FileToUpZip, ZipedFolder, "");
        }

        #endregion

    }

    #endregion

}