C#实现的文件压缩和解压缩类

本文实例讲述了C#实现的文件压缩和解压缩类。分享给大家供大家参考。具体分析如下：

这个C#代码包含了几个类，封装了文件压缩和解压缩常用的方法，包括直接通过代码进行压缩，也有调用winrar对文件进行压缩的

using System;
using System.IO;
using System.Diagnostics;
using Microsoft.Win32;
using ICSharpCode.SharpZipLib.Checksums;
using ICSharpCode.SharpZipLib.Zip;
///压缩、解压缩类
namespace DotNet.Utilities
{
  public class SharpZip
  {
    public SharpZip()
    { }
    /// <summary>
    /// 压缩
    /// </summary> 
    /// <param name="filename"> 压缩后的文件名(包含物理路径)</param>
    /// <param name="directory">待压缩的文件夹(包含物理路径)</param>
    public static void PackFiles(string filename, string directory)
    {
      try
      {
        FastZip fz = new FastZip();
        fz.CreateEmptyDirectories = true;
        fz.CreateZip(filename, directory, true, "");
        fz = null;
      }
      catch (Exception)
      {
        throw;
      }
    }
    /// <summary>
    /// 解压缩
    /// </summary>
    /// <param name="file">待解压文件名(包含物理路径)</param>
    /// <param name="dir"> 解压到哪个目录中(包含物理路径)</param>
    public static bool UnpackFiles(string file, string dir)
    {
      try
      {
        if (!Directory.Exists(dir))
        {
          Directory.CreateDirectory(dir);
        }
        ZipInputStream s = new ZipInputStream(File.OpenRead(file));
        ZipEntry theEntry;
        while ((theEntry = s.GetNextEntry()) != null)
        {
          string directoryName = Path.GetDirectoryName(theEntry.Name);
          string fileName = Path.GetFileName(theEntry.Name);
          if (directoryName != String.Empty)
          {
            Directory.CreateDirectory(dir + directoryName);
          }
          if (fileName != String.Empty)
          {
            FileStream streamWriter = File.Create(dir + theEntry.Name);
            int size = 2048;
            byte[] data = new byte[2048];
            while (true)
            {
              size = s.Read(data, 0, data.Length);
              if (size > 0)
              {
                streamWriter.Write(data, 0, size);
              }
              else
              {
                break;
              }
            }
            streamWriter.Close();
          }
        }
        s.Close();
        return true;
      }
      catch (Exception)
      {
        throw;
      }
    }
  }
  public class ClassZip
  {
    #region 私有方法
    /// <summary>
    /// 递归压缩文件夹方法
    /// </summary>
    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
      {
        entry = new ZipEntry(Path.Combine(ParentFolderName, Path.GetFileName(FolderToZip) + "/"));
        s.PutNextEntry(entry);
        s.Flush();
        filenames = Directory.GetFiles(FolderToZip);
        foreach (string file in filenames)
        {
          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;
    }
    /// <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>
    private static bool ZipFileDictory(string FolderToZip, string ZipedFile, int level)
    {
      bool res;
      if (!Directory.Exists(FolderToZip))
      {
        return false;
      }
      ZipOutputStream s = new ZipOutputStream(File.Create(ZipedFile));
      s.SetLevel(level);
      res = ZipFileDictory(FolderToZip, s, "");
      s.Finish();
      s.Close();
      return res;
    }
    /// <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>
    private static bool ZipFile(string FileToZip, string ZipedFile, int level)
    {
      if (!File.Exists(FileToZip))
      {
        throw new System.IO.FileNotFoundException("指定要压缩的文件: " + FileToZip + " 不存在!");
      }
      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);
        ZipEntry = new ZipEntry(Path.GetFileName(FileToZip));
        ZipStream.PutNextEntry(ZipEntry);
        ZipStream.SetLevel(level);

        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
    /// <summary>
    /// 压缩
    /// </summary>
    /// <param name="FileToZip">待压缩的文件目录</param>
    /// <param name="ZipedFile">生成的目标文件</param>
    /// <param name="level">6</param>
    public static bool Zip(String FileToZip, String ZipedFile, int level)
    {
      if (Directory.Exists(FileToZip))
      {
        return ZipFileDictory(FileToZip, ZipedFile, level);
      }
      else if (File.Exists(FileToZip))
      {
        return ZipFile(FileToZip, ZipedFile, level);
      }
      else
      {
        return false;
      }
    }
    /// <summary>
    /// 解压
    /// </summary>
    /// <param name="FileToUpZip">待解压的文件</param>
    /// <param name="ZipedFolder">解压目标存放目录</param>
    public static void UnZip(string FileToUpZip, string ZipedFolder)
    {
      if (!File.Exists(FileToUpZip))
      {
        return;
      }
      if (!Directory.Exists(ZipedFolder))
      {
        Directory.CreateDirectory(ZipedFolder);
      }
      ZipInputStream s = null;
      ZipEntry theEntry = null;
      string fileName;
      FileStream streamWriter = null;
      try
      {
        s = new ZipInputStream(File.OpenRead(FileToUpZip));
        while ((theEntry = s.GetNextEntry()) != null)
        {
          if (theEntry.Name != String.Empty)
          {
            fileName = Path.Combine(ZipedFolder, theEntry.Name);
            if (fileName.EndsWith("/") || fileName.EndsWith("\\"))
            {
              Directory.CreateDirectory(fileName);
              continue;
            }
            streamWriter = File.Create(fileName);
            int size = 2048;
            byte[] data = new byte[2048];
            while (true)
            {
              size = s.Read(data, 0, data.Length);
              if (size > 0)
              {
                streamWriter.Write(data, 0, size);
              }
              else
              {
                break;
              }
            }
          }
        }
      }
      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);
      }
    }
  }
  public class ZipHelper
  {
    #region 私有变量
    String the_rar;
    RegistryKey the_Reg;
    Object the_Obj;
    String the_Info;
    ProcessStartInfo the_StartInfo;
    Process the_Process;
    #endregion
    /// <summary>
    /// 压缩
    /// </summary>
    /// <param name="zipname">要解压的文件名</param>
    /// <param name="zippath">要压缩的文件目录</param>
    /// <param name="dirpath">初始目录</param>
    public void EnZip(string zipname, string zippath, string dirpath)
    {
      try
      {
        the_Reg = Registry.ClassesRoot.OpenSubKey(@"Applications\WinRAR.exe\Shell\Open\Command");
        the_Obj = the_Reg.GetValue("");
        the_rar = the_Obj.ToString();
        the_Reg.Close();
        the_rar = the_rar.Substring(1, the_rar.Length - 7);
        the_Info = " a  " + zipname + " " + zippath;
        the_StartInfo = new ProcessStartInfo();
        the_StartInfo.FileName = the_rar;
        the_StartInfo.Arguments = the_Info;
        the_StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
        the_StartInfo.WorkingDirectory = dirpath;
        the_Process = new Process();
        the_Process.StartInfo = the_StartInfo;
        the_Process.Start();
      }
      catch (Exception ex)
      {
        throw new Exception(ex.Message);
      }
    }
    /// <summary>
    /// 解压缩
    /// </summary>
    /// <param name="zipname">要解压的文件名</param>
    /// <param name="zippath">要解压的文件路径</param>
    public void DeZip(string zipname, string zippath)
    {
      try
      {
        the_Reg = Registry.ClassesRoot.OpenSubKey(@"Applications\WinRar.exe\Shell\Open\Command");
        the_Obj = the_Reg.GetValue("");
        the_rar = the_Obj.ToString();
        the_Reg.Close();
        the_rar = the_rar.Substring(1, the_rar.Length - 7);
        the_Info = " X " + zipname + " " + zippath;
        the_StartInfo = new ProcessStartInfo();
        the_StartInfo.FileName = the_rar;
        the_StartInfo.Arguments = the_Info;
        the_StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
        the_Process = new Process();
        the_Process.StartInfo = the_StartInfo;
        the_Process.Start();
      }
      catch (Exception ex)
      {
        throw new Exception(ex.Message);
      }
    }
  }
}

希望本文所述对大家的C#程序设计有所帮助。