C#使用ICSharpCode.SharpZipLib.dll进行文件的压缩与解压功能

下面给大家介绍c#使用icsharpcode.sharpziplib.dll进行文件的压缩与解压功能，具体代码如下所示：

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压缩与解压
{
 public class ziphelper
 {
  /// <summary>
  /// 压缩单个文件
  /// </summary>
  /// <param name="filetozip">需压缩的文件名</param>
  /// <param name="zipfile">压缩后的文件名（文件名都是绝对路径）</param>
  /// <param name="level">压缩等级（0-9）</param>
  /// <param name="password">压缩密码（解压是需要的密码）</param>
  public static void zipfile(string filetozip, string zipfile, int level = 5, string password = "123")
  {
   if (!file.exists(filetozip))
    throw new filenotfoundexception("压缩文件" + filetozip + "不存在");
   using (filestream fs = file.openread(filetozip))
   {
    fs.position = 0;//设置流的起始位置
    byte[] buffer = new byte[(int)fs.length];
    fs.read(buffer, 0, buffer.length);//读取的时候设置position，写入的时候不需要设置
    fs.close();
    using (filestream zfstram = file.create(zipfile))
    {
     using (zipoutputstream zipstream = new zipoutputstream(zfstram))
     {
      zipstream.password = md5(password);//设置属性的时候在putnextentry函数之前
      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>
  /// 压缩多个文件目录
  /// </summary>
  /// <param name="dirname">需要压缩的目录</param>
  /// <param name="zipfile">压缩后的文件名</param>
  /// <param name="level">压缩等级</param>
  /// <param name="password">密码</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>
  /// 往压缩文件里面添加entry
  /// </summary>
  /// <param name="pathstr">文件路径</param>
  /// <param name="zos">zipoutputstream</param>
  /// <param name="basedirname">基础目录</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)//如果是文件夹继续递归
    {
     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>
  /// 解压多个文件目录
  /// </summary>
  /// <param name="zfile">压缩文件绝对路径</param>
  /// <param name="dirname">解压文件目录</param>
  /// <param name="password">密码</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('\\');//这边判断压缩文件里面是否存在目录，存在的话先创建目录后继续解压
     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;
  }
 }
}

调用函数如下:

static void main(string[] args)
  {
   var str = @"\学籍导入模板.xls";
   //var arr=str.split('\\');
   var filepath = @"d:\程序文件\vs2010学习\studyprogram\zip压缩与解压\file\学籍导入模板.xls";
   //ziphelper.zipfile(filepath, @"d:\程序文件\vs2010学习\studyprogram\zip压缩与解压\file\test.zip", 6, "123");
   var dirpath = @"d:\程序文件\vs2010学习\studyprogram\zip压缩与解压";
   //ziphelper.zipdir(dirpath + @"\file", dirpath + @"\file.zip", 6, "huage");
   ziphelper.unzip(dirpath + @"\file.zip", dirpath + @"\test", "huage");
   console.readkey();
  }

效果图如下：

总结

以上所述是小编给大家介绍的c#使用icsharpcode.sharpziplib.dll进行文件的压缩与解压功能，希望对大家有所帮助