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壓縮幫助類
  ///
  /// 修改紀(jì)錄
  ///
  ///    2015-09-16 版本：1.0 YangHengLian 創(chuàng)建主鍵，注意命名空間的排序。
  ///   2016-5-7 YangHengLian增加了可以支持多個(gè)文件或者多個(gè)文件夾打包成一個(gè)zip文件
  /// 
  /// 版本：1.0
  ///
  /// <author>
  ///    <name>YangHengLian</name>
  ///    <date>2015-09-16</date>
  /// </author>
  /// </summary>
  public class ZipHelper
  {
    /// <summary>
    /// 壓縮文件夾
    /// </summary>
    /// <param name="dirToZip"></param>
    /// <param name="zipedFileName"></param>
    /// <param name="compressionLevel">壓縮率0（無(wú)壓縮）9（壓縮率最高）</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> 
    /// 獲取所有文件 
    /// </summary> 
    /// <returns></returns> 
    public Hashtable GetAllFies(string dir)
    {
      Hashtable filesList = new Hashtable();
      DirectoryInfo fileDire = new DirectoryInfo(dir);
      if (!fileDire.Exists)
      {
        throw new FileNotFoundException("目錄:" + fileDire.FullName + "沒(méi)有找到!");
      }

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

    /// <summary> 
    /// 獲取一個(gè)文件夾下的所有文件夾里的文件 
    /// </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> 
    /// 獲取一個(gè)文件夾下的文件 
    /// </summary> 
    /// <param name="dir">目錄名稱</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：解壓zip格式的文件。 
    /// </summary> 
    /// <param name="zipFilePath">壓縮文件路徑</param> 
    /// <param name="unZipDir">解壓文件存放路徑,為空時(shí)默認(rèn)與壓縮文件同一級(jí)目錄下，跟壓縮文件同名的文件夾</param> 
    /// <returns>解壓是否成功</returns> 
    public void UnZip(string zipFilePath, string unZipDir)
    {
      if (zipFilePath == string.Empty)
      {
        throw new Exception("壓縮文件不能為空！");
      }
      if (!File.Exists(zipFilePath))
      {
        throw new FileNotFoundException("壓縮文件不存在！");
      }
      //解壓文件夾為空時(shí)默認(rèn)與壓縮文件同一級(jí)目錄下，跟壓縮文件同名的文件夾 
      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>
    /// 壓縮單個(gè)文件
    /// </summary>
    /// <param name="filePath">被壓縮的文件名稱(包含文件路徑)，文件的全路徑</param>
    /// <param name="zipedFileName">壓縮后的文件名稱(包含文件路徑)，保存的文件名稱</param>
    /// <param name="compressionLevel">壓縮率0（無(wú)壓縮）到 9（壓縮率最高）</param>
    public void ZipFile(string filePath, string zipedFileName, int compressionLevel = 9)
    {
      // 如果文件沒(méi)有找到，則報(bào)錯(cuò) 
      if (!File.Exists(filePath))
      {
        throw new FileNotFoundException("文件：" + filePath + "沒(méi)有找到！");
      }
      // 如果壓縮后名字為空就默認(rèn)使用源文件名稱作為壓縮文件名稱
      if (string.IsNullOrEmpty(zipedFileName))
      {
        string oldValue = Path.GetFileName(filePath);
        if (oldValue != null)
        {
          zipedFileName = filePath.Replace(oldValue, "") + Path.GetFileNameWithoutExtension(filePath) + ".zip";
        }
      }
      // 如果壓縮后的文件名稱后綴名不是zip，就是加上zip，防止是一個(gè)亂碼文件
      if (Path.GetExtension(zipedFileName) != ".zip")
      {
        zipedFileName = zipedFileName + ".zip";
      }
      // 如果指定位置目錄不存在，創(chuàng)建該目錄 C:\Users\yhl\Desktop\大漢三通
      string zipedDir = zipedFileName.Substring(0, zipedFileName.LastIndexOf("\\", StringComparison.Ordinal));
      if (!Directory.Exists(zipedDir))
      {
        Directory.CreateDirectory(zipedDir);
      }
      // 被壓縮文件名稱
      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> 
    /// 壓縮單個(gè)文件 
    /// </summary> 
    /// <param name="fileToZip">要進(jìn)行壓縮的文件名，全路徑</param> 
    /// <param name="zipedFile">壓縮后生成的壓縮文件名,全路徑</param> 
    public void ZipFile(string fileToZip, string zipedFile)
    {
      // 如果文件沒(méi)有找到，則報(bào)錯(cuò) 
      if (!File.Exists(fileToZip))
      {
        throw new FileNotFoundException("指定要壓縮的文件: " + 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>
    /// 壓縮多個(gè)目錄或文件
    /// </summary>
    /// <param name="folderOrFileList">待壓縮的文件夾或者文件，全路徑格式,是一個(gè)集合</param>
    /// <param name="zipedFile">壓縮后的文件名，全路徑格式</param>
    /// <param name="password">壓宿密碼</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)
        {
          //是文件夾
          if (Directory.Exists(fileOrDir))
          {
            res = ZipFileDictory(fileOrDir, s, "");
          }
          else
          {
            //文件
            res = ZipFileWithStream(fileOrDir, s);
          }
        }
        s.Finish();
        s.Close();
        return res;
      }
    }

    /// <summary>
    /// 帶壓縮流壓縮單個(gè)文件
    /// </summary>
    /// <param name="fileToZip">要進(jìn)行壓縮的文件名</param>
    /// <param name="zipStream"></param>
    /// <returns></returns>
    private bool ZipFileWithStream(string fileToZip, ZipOutputStream zipStream)
    {
      //如果文件沒(méi)有找到，則報(bào)錯(cuò)
      if (!File.Exists(fileToZip))
      {
        throw new FileNotFoundException("指定要壓縮的文件: " + 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>
    /// 遞歸壓縮文件夾方法
    /// </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
      {
        //創(chuàng)建當(dāng)前文件夾
        entry = new ZipEntry(Path.Combine(parentFolderName, Path.GetFileName(folderToZip) + "/")); //加上 “/” 才會(huì)當(dāng)成是文件夾創(chuàng)建
        s.PutNextEntry(entry);
        s.Flush();
        //先壓縮文件，再遞歸壓縮文件夾
        var filenames = Directory.GetFiles(folderToZip);
        foreach (string file in filenames)
        {
          //打開(kāi)壓縮文件
          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;
    }
  }
}