using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.IO;using ICSharpCode.SharpZipLib.Zip;using ICSharpCode.SharpZipLib.Checksums;using System.Security.Cryptography;namespace zip壓縮與解壓{ public class ZipHelper {  /// <summary>  /// 壓縮單個文件  /// </summary>  /// <param name="fileToZip">需壓縮的文件名</param>  /// <param name="zipFile">壓縮后的文件名（文件名都是絕對路徑）</param>  /// <param name="level">壓縮等級（0-9）</param>  /// <param name="password">壓縮密碼（解壓是需要的密碼）</param>  public static void ZipFile(string fileToZip, string zipFile, int level = 5, string password = "123")  {   if (!File.Exists(fileToZip))    throw new FileNotFoundException("壓縮文件" + fileToZip + "不存在");   using (FileStream fs = File.OpenRead(fileToZip))   {    fs.Position = 0;//設置流的起始位置    byte[] buffer = new byte[(int)fs.Length];    fs.Read(buffer, 0, buffer.Length);//讀取的時候設置Position，寫入的時候不需要設置    fs.Close();    using (FileStream zfstram = File.Create(zipFile))    {     using (ZipOutputStream zipstream = new ZipOutputStream(zfstram))     {      zipstream.Password = md5(password);//設置屬性的時候在PutNextEntry函數之前      zipstream.SetLevel(level);      string fileName = fileToZip.Substring(fileToZip.LastIndexOf('//') + 1);      ZipEntry entry = new ZipEntry(fileName);      zipstream.PutNextEntry(entry);      zipstream.Write(buffer, 0, buffer.Length);     }    }   }  }  /// <summary>  /// 壓縮多個文件目錄  /// </summary>  /// <param name="dirname">需要壓縮的目錄</param>  /// <param name="zipFile">壓縮后的文件名</param>  /// <param name="level">壓縮等級</param>  /// <param name="password">密碼</param>  public static void ZipDir(string dirname, string zipFile, int level = 5, string password = "123")  {   ZipOutputStream zos = new ZipOutputStream(File.Create(zipFile));   zos.Password = md5(password);   zos.SetLevel(level);   addZipEntry(dirname, zos, dirname);   zos.Finish();   zos.Close();  }  /// <summary>  /// 往壓縮文件里面添加Entry  /// </summary>  /// <param name="PathStr">文件路徑</param>  /// <param name="zos">ZipOutputStream</param>  /// <param name="BaseDirName">基礎目錄</param>  private static void addZipEntry(string PathStr, ZipOutputStream zos, string BaseDirName)  {   DirectoryInfo dir = new DirectoryInfo(PathStr);   foreach (FileSystemInfo item in dir.GetFileSystemInfos())   {    if ((item.Attributes & FileAttributes.Directory) == FileAttributes.Directory)//如果是文件夾繼續遞歸    {     addZipEntry(item.FullName, zos, BaseDirName);    }    else    {     FileInfo f_item = (FileInfo)item;     using (FileStream fs = f_item.OpenRead())     {      byte[] buffer = new byte[(int)fs.Length];      fs.Position = 0;      fs.Read(buffer, 0, buffer.Length);      fs.Close();      ZipEntry z_entry = new ZipEntry(item.FullName.Replace(BaseDirName, ""));      zos.PutNextEntry(z_entry);      zos.Write(buffer, 0, buffer.Length);     }    }   }  }  /// <summary>  /// 解壓多個文件目錄  /// </summary>  /// <param name="zfile">壓縮文件絕對路徑</param>  /// <param name="dirname">解壓文件目錄</param>  /// <param name="password">密碼</param>  public static void UnZip(string zfile, string dirname, string password)  {   if (!Directory.Exists(dirname)) Directory.CreateDirectory(dirname);   using (ZipInputStream zis = new ZipInputStream(File.OpenRead(zfile)))   {    zis.Password = md5(password);    ZipEntry entry;    while ((entry = zis.GetNextEntry()) != null)    {     var strArr = entry.Name.Split('//');//這邊判斷壓縮文件里面是否存在目錄，存在的話先創建目錄后繼續解壓     if (strArr.Length > 2)        Directory.CreateDirectory(dirname + @"/" + strArr[1]);     using (FileStream dir_fs = File.Create(dirname + entry.Name))     {      int size = 1024 * 2;      byte[] buffer = new byte[size];      while (true)      {       size = zis.Read(buffer, 0, buffer.Length);       if (size > 0)        dir_fs.Write(buffer, 0, size);       else        break;      }     }    }   }  }  private static string md5(string pwd)  {   var res = "";   MD5 md = MD5.Create();   byte[] s = md.ComputeHash(Encoding.Default.GetBytes(pwd));   for (int i = 0; i < s.Length; i++)    res = res + s[i].ToString("X");   return res;  } }}

static void Main(string[] args)  {   var str = @"/學籍導入模板.xls";   //var arr=str.Split('//');   var filePath = @"D:/程序文件/VS2010學習/StudyProgram/zip壓縮與解壓/File/學籍導入模板.xls";   //ZipHelper.ZipFile(filePath, @"D:/程序文件/VS2010學習/StudyProgram/zip壓縮與解壓/File/test.zip", 6, "123");   var dirPath = @"D:/程序文件/VS2010學習/StudyProgram/zip壓縮與解壓";   //ZipHelper.ZipDir(dirPath + @"/File", dirPath + @"/File.zip", 6, "huage");   ZipHelper.UnZip(dirPath + @"/File.zip", dirPath + @"/test", "huage");   Console.ReadKey();  }