public void UnZip(string zipFilePath, string unZipDir)

//-------------------------------------------------------------------------------------
// All Rights Reserved , Copyright (C) 2016 , ZTO , Ltd .
//-------------------------------------------------------------------------------------

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;

namespace ZTO.PicTest.Utilities
{
  using ICSharpCode.SharpZipLib.Checksums;
  using ICSharpCode.SharpZipLib.Zip;

  /// <summary>
  /// Zip压缩帮助类
  ///
  /// 修改纪录
  ///
  ///    2015-09-16 版本：1.0 YangHengLian 创建主键，注意命名空间的排序。
  ///   2016-5-7 YangHengLian增加了可以支持多个文件或者多个文件夹打包成一个zip文件
  /// 
  /// 版本：1.0
  ///
  /// <author>
  ///    <name>YangHengLian</name>
  ///    <date>2015-09-16</date>
  /// </author>
  /// </summary>
  public class ZipHelper
  {
    /// <summary>
    /// 压缩文件夹
    /// </summary>
    /// <param name=\"dirToZip\"></param>
    /// <param name=\"zipedFileName\"></param>
    /// <param name=\"compressionLevel\">压缩率0（无压缩）9（压缩率最高）</param>
    public void ZipDir(string dirToZip, string zipedFileName, int compressionLevel = 9)
    {
      if (Path.GetExtension(zipedFileName) != \".zip\")
      {
        zipedFileName = zipedFileName + \".zip\";
      }
      using (var zipoutputstream = new ZipOutputStream(File.Create(zipedFileName)))
      {
        zipoutputstream.SetLevel(compressionLevel);
        Crc32 crc = new Crc32();
        Hashtable fileList = GetAllFies(dirToZip);
        foreach (DictionaryEntry item in fileList)
        {
          FileStream fs = new FileStream(item.Key.ToString(), FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
          byte[] buffer = new byte[fs.Length];
          fs.Read(buffer, 0, buffer.Length);
          // ZipEntry entry = new ZipEntry(item.Key.ToString().Substring(dirToZip.Length + 1));
          ZipEntry entry = new ZipEntry(Path.GetFileName(item.Key.ToString()))
                   {
                     DateTime = (DateTime) item.Value,
                     Size = fs.Length
                   };
          fs.Close();
          crc.Reset();
          crc.Update(buffer);
          entry.Crc = crc.Value;
          zipoutputstream.PutNextEntry(entry);
          zipoutputstream.Write(buffer, 0, buffer.Length);
        }
      }
    }

    /// <summary> 
    /// 获取所有文件 
    /// </summary> 
    /// <returns></returns> 
    public Hashtable GetAllFies(string dir)
    {
      Hashtable filesList = new Hashtable();
      DirectoryInfo fileDire = new DirectoryInfo(dir);
      if (!fileDire.Exists)
      {
        throw new FileNotFoundException(\"目录:\" + fileDire.FullName + \"没有找到!\");
      }

      GetAllDirFiles(fileDire, filesList);
      GetAllDirsFiles(fileDire.GetDirectories(), filesList);
      return filesList;
    }

    /// <summary> 
    /// 获取一个文件夹下的所有文件夹里的文件 
    /// </summary> 
    /// <param name=\"dirs\"></param> 
    /// <param name=\"filesList\"></param> 
    public void GetAllDirsFiles(IEnumerable<DirectoryInfo> dirs, Hashtable filesList)
    {
      foreach (DirectoryInfo dir in dirs)
      {
        foreach (FileInfo file in dir.GetFiles(\"*.*\"))
        {
          filesList.Add(file.FullName, file.LastWriteTime);
        }
        GetAllDirsFiles(dir.GetDirectories(), filesList);
      }
    }

    /// <summary> 
    /// 获取一个文件夹下的文件 
    /// </summary> 
    /// <param name=\"dir\">目录名称</param>
    /// <param name=\"filesList\">文件列表HastTable</param> 
    public static void GetAllDirFiles(DirectoryInfo dir, Hashtable filesList)
    {
      foreach (FileInfo file in dir.GetFiles(\"*.*\"))
      {
        filesList.Add(file.FullName, file.LastWriteTime);
      }
    }

    /// <summary> 
    /// 功能：解压zip格式的文件。 
    /// </summary> 
    /// <param name=\"zipFilePath\">压缩文件路径</param> 
    /// <param name=\"unZipDir\">解压文件存放路径,为空时默认与压缩文件同一级目录下，跟压缩文件同名的文件夹</param> 
    /// <returns>解压是否成功</returns> 
    public void UnZip(string zipFilePath, string unZipDir)
    {
      if (zipFilePath == string.Empty)
      {
        throw new Exception(\"压缩文件不能为空！\");
      }
      if (!File.Exists(zipFilePath))
      {
        throw new FileNotFoundException(\"压缩文件不存在！\");
      }
      //解压文件夹为空时默认与压缩文件同一级目录下，跟压缩文件同名的文件夹 
      if (unZipDir == string.Empty)
        unZipDir = zipFilePath.Replace(Path.GetFileName(zipFilePath), Path.GetFileNameWithoutExtension(zipFilePath));
      if (!unZipDir.EndsWith(\"/\"))
        unZipDir += \"/\";
      if (!Directory.Exists(unZipDir))
        Directory.CreateDirectory(unZipDir);

      using (var s = new ZipInputStream(File.OpenRead(zipFilePath)))
      {

        ZipEntry theEntry;
        while ((theEntry = s.GetNextEntry()) != null)
        {
          string directoryName = Path.GetDirectoryName(theEntry.Name);
          string fileName = Path.GetFileName(theEntry.Name);
          if (!string.IsNullOrEmpty(directoryName))
          {
            Directory.CreateDirectory(unZipDir + directoryName);
          }
          if (directoryName != null && !directoryName.EndsWith(\"/\"))
          {
          }
          if (fileName != String.Empty)
          {
            using (FileStream streamWriter = File.Create(unZipDir + theEntry.Name))
            {

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

    /// <summary>
    /// 压缩单个文件
    /// </summary>
    /// <param name=\"filePath\">被压缩的文件名称(包含文件路径)，文件的全路径</param>
    /// <param name=\"zipedFileName\">压缩后的文件名称(包含文件路径)，保存的文件名称</param>
    /// <param name=\"compressionLevel\">压缩率0（无压缩）到 9（压缩率最高）</param>
    public void ZipFile(string filePath, string zipedFileName, int compressionLevel = 9)
    {
      // 如果文件没有找到，则报错 
      if (!File.Exists(filePath))
      {
        throw new FileNotFoundException(\"文件：\" + filePath + \"没有找到！\");
      }
      // 如果压缩后名字为空就默认使用源文件名称作为压缩文件名称
      if (string.IsNullOrEmpty(zipedFileName))
      {
        string oldValue = Path.GetFileName(filePath);
        if (oldValue != null)
        {
          zipedFileName = filePath.Replace(oldValue, \"\") + Path.GetFileNameWithoutExtension(filePath) + \".zip\";
        }
      }
      // 如果压缩后的文件名称后缀名不是zip，就是加上zip，防止是一个乱码文件
      if (Path.GetExtension(zipedFileName) != \".zip\")
      {
        zipedFileName = zipedFileName + \".zip\";
      }
      // 如果指定位置目录不存在，创建该目录 C:\\Users\\yhl\\Desktop\\大汉三通
      string zipedDir = zipedFileName.Substring(0, zipedFileName.LastIndexOf(\"\\\\\", StringComparison.Ordinal));
      if (!Directory.Exists(zipedDir))
      {
        Directory.CreateDirectory(zipedDir);
      }
      // 被压缩文件名称
      string filename = filePath.Substring(filePath.LastIndexOf(\"\\\\\", StringComparison.Ordinal) + 1);
      var streamToZip = new FileStream(filePath, FileMode.Open, FileAccess.Read);
      var zipFile = File.Create(zipedFileName);
      var zipStream = new ZipOutputStream(zipFile);
      var zipEntry = new ZipEntry(filename);
      zipStream.PutNextEntry(zipEntry);
      zipStream.SetLevel(compressionLevel);
      var buffer = new byte[2048];
      Int32 size = streamToZip.Read(buffer, 0, buffer.Length);
      zipStream.Write(buffer, 0, size);
      try
      {
        while (size < streamToZip.Length)
        {
          int sizeRead = streamToZip.Read(buffer, 0, buffer.Length);
          zipStream.Write(buffer, 0, sizeRead);
          size += sizeRead;
        }
      }
      finally
      {
        zipStream.Finish();
        zipStream.Close();
        streamToZip.Close();
      }
    }

    /// <summary> 
    /// 压缩单个文件 
    /// </summary> 
    /// <param name=\"fileToZip\">要进行压缩的文件名，全路径</param> 
    /// <param name=\"zipedFile\">压缩后生成的压缩文件名,全路径</param> 
    public void ZipFile(string fileToZip, string zipedFile)
    {
      // 如果文件没有找到，则报错 
      if (!File.Exists(fileToZip))
      {
        throw new FileNotFoundException(\"指定要压缩的文件: \" + fileToZip + \" 不存在!\");
      }
      using (FileStream fileStream = File.OpenRead(fileToZip))
      {
        byte[] buffer = new byte[fileStream.Length];
        fileStream.Read(buffer, 0, buffer.Length);
        fileStream.Close();
        using (FileStream zipFile = File.Create(zipedFile))
        {
          using (ZipOutputStream zipOutputStream = new ZipOutputStream(zipFile))
          {
            // string fileName = fileToZip.Substring(fileToZip.LastIndexOf(\"\\\\\") + 1);
            string fileName = Path.GetFileName(fileToZip);
            var zipEntry = new ZipEntry(fileName)
            {
              DateTime = DateTime.Now,
              IsUnicodeText = true
            };
            zipOutputStream.PutNextEntry(zipEntry);
            zipOutputStream.SetLevel(5);
            zipOutputStream.Write(buffer, 0, buffer.Length);
            zipOutputStream.Finish();
            zipOutputStream.Close();
          }
        }
      }
    }

    /// <summary>
    /// 压缩多个目录或文件
    /// </summary>
    /// <param name=\"folderOrFileList\">待压缩的文件夹或者文件，全路径格式,是一个集合</param>
    /// <param name=\"zipedFile\">压缩后的文件名，全路径格式</param>
    /// <param name=\"password\">压宿密码</param>
    /// <returns></returns>
    public bool ZipManyFilesOrDictorys(IEnumerable<string> folderOrFileList, string zipedFile, string password)
    {
      bool res = true;
      using (var s = new ZipOutputStream(File.Create(zipedFile)))
      {
        s.SetLevel(6);
        if (!string.IsNullOrEmpty(password))
        {
          s.Password = password;
        }
        foreach (string fileOrDir in folderOrFileList)
        {
          //是文件夹
          if (Directory.Exists(fileOrDir))
          {
            res = ZipFileDictory(fileOrDir, s, \"\");
          }
          else
          {
            //文件
            res = ZipFileWithStream(fileOrDir, s);
          }
        }
        s.Finish();
        s.Close();
        return res;
      }
    }

    /// <summary>
    /// 带压缩流压缩单个文件
    /// </summary>
    /// <param name=\"fileToZip\">要进行压缩的文件名</param>
    /// <param name=\"zipStream\"></param>
    /// <returns></returns>
    private bool ZipFileWithStream(string fileToZip, ZipOutputStream zipStream)
    {
      //如果文件没有找到，则报错
      if (!File.Exists(fileToZip))
      {
        throw new FileNotFoundException(\"指定要压缩的文件: \" + fileToZip + \" 不存在!\");
      }
      //FileStream fs = null;
      FileStream zipFile = 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();
        zipEntry = new ZipEntry(Path.GetFileName(fileToZip));
        zipStream.PutNextEntry(zipEntry);
        zipStream.Write(buffer, 0, buffer.Length);
      }
      catch
      {
        res = false;
      }
      finally
      {
        if (zipEntry != null)
        {
        }

        if (zipFile != null)
        {
          zipFile.Close();
        }
        GC.Collect();
        GC.Collect(1);
      }
      return res;

    }

    /// <summary>
    /// 递归压缩文件夹方法
    /// </summary>
    /// <param name=\"folderToZip\"></param>
    /// <param name=\"s\"></param>
    /// <param name=\"parentFolderName\"></param>
    private bool ZipFileDictory(string folderToZip, ZipOutputStream s, string parentFolderName)
    {
      bool res = true;
      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
        var 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();
        }
        if (entry != null)
        {
        }
        GC.Collect();
        GC.Collect(1);
      }
      var folders = Directory.GetDirectories(folderToZip);
      foreach (string folder in folders)
      {
        if (!ZipFileDictory(folder, s, Path.Combine(parentFolderName, Path.GetFileName(folderToZip))))
        {
          return false;
        }
      }
      return res;
    }
  }
}