（转载）C#压缩解压zip 文件

转载之：

C#压缩解压zip 文件 - 大气象 - 博客园
http://www.cnblogs.com/greatverve/archive/2011/12/27/csharp-zip.html

C# 从服务器下载文件代码 - iWantyous - 博客园

http://www.cnblogs.com/Warmsunshine/archive/2011/03/05/1971521.html

C#中关于zip压缩解压帮助类的封装

http://www.cnblogs.com/Bonker/archive/2012/12/25/2831970.html

    首先需要在项目里引用SharpZipLib.dll。然后修改其中的关于压缩和解压缩的类。实现源码如下： 

 /// <summary>
 /// 压缩文件
 /// </summary>
using System;
using System.IO;
using ICSharpCode.SharpZipLib.Checksums;
using ICSharpCode.SharpZipLib.Zip;
using ICSharpCode.SharpZipLib.GZip;
namespace Compression
{
 public class ZipClass
 {
 
  public void ZipFile(string FileToZip, string ZipedFile ,int CompressionLevel, int BlockSize)
  {
   //如果文件没有找到，则报错
   if (! System.IO.File.Exists(FileToZip)) 
   {
    throw new System.IO.FileNotFoundException("The specified file " + FileToZip + " could not be found. Zipping aborderd");
   }
  
   System.IO.FileStream StreamToZip = new System.IO.FileStream(FileToZip,System.IO.FileMode.Open , System.IO.FileAccess.Read);
   System.IO.FileStream ZipFile = System.IO.File.Create(ZipedFile);
   ZipOutputStream ZipStream = new ZipOutputStream(ZipFile);
   ZipEntry ZipEntry = new ZipEntry("ZippedFile");
   ZipStream.PutNextEntry(ZipEntry);
   ZipStream.SetLevel(CompressionLevel);
   byte[] buffer = new byte[BlockSize];
   System.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;
    }
   } 
   catch(System.Exception ex)
   {
    throw ex;
   }
   ZipStream.Finish();
   ZipStream.Close();
   StreamToZip.Close();
  }
 
  public void ZipFileMain(string[] args)
  {
   string[] filenames = Directory.GetFiles(args[0]);
  
   Crc32 crc = new Crc32();
   ZipOutputStream s = new ZipOutputStream(File.Create(args[1]));
  
   s.SetLevel(6); // 0 - store only to 9 - means best compression
  
   foreach (string file in filenames) 
   {
    //打开压缩文件
    FileStream fs = File.OpenRead(file);
   
    byte[] buffer = new byte[fs.Length];
    fs.Read(buffer, 0, buffer.Length);
    ZipEntry entry = new ZipEntry(file);
   
    entry.DateTime = DateTime.Now;
   
    // set Size and the crc, because the information
    // about the size and crc should be stored in the header
    // if it is not set it is automatically written in the footer.
    // (in this case size == crc == -1 in the header)
    // Some ZIP programs have problems with zip files that don't store
    // the size and crc in the header.
    entry.Size = fs.Length;
    fs.Close();
   
    crc.Reset();
    crc.Update(buffer);
   
    entry.Crc  = crc.Value;
   
    s.PutNextEntry(entry);
   
    s.Write(buffer, 0, buffer.Length);
   
   }
  
   s.Finish();
   s.Close();
  }
 }
}
现在再来看看解压文件类的源码
 /// <summary>
 /// 解压文件
 /// </summary>
using System;
using System.Text;
using System.Collections;
using System.IO;
using System.Diagnostics;
using System.Runtime.Serialization.Formatters.Binary;
using System.Data;
using ICSharpCode.SharpZipLib.BZip2;
using ICSharpCode.SharpZipLib.Zip;
using ICSharpCode.SharpZipLib.Zip.Compression;
using ICSharpCode.SharpZipLib.Zip.Compression.Streams;
using ICSharpCode.SharpZipLib.GZip;
namespace DeCompression
{
 public class UnZipClass
 {   
  public void UnZip(string[] args)
  {
   ZipInputStream s = new ZipInputStream(File.OpenRead(args[0]));
  
   ZipEntry theEntry;
   while ((theEntry = s.GetNextEntry()) != null) 
   {
   
          string directoryName = Path.GetDirectoryName(args[1]);
    string fileName      = Path.GetFileName(theEntry.Name);
   
    //生成解压目录
    Directory.CreateDirectory(directoryName);
   
    if (fileName != String.Empty) 
    {   
     //解压文件到指定的目录
     FileStream streamWriter = File.Create(args[1]+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();
  }
 }
}
    有了压缩和解压缩的类以后，就要在窗体里调用了。怎么？是新手，不会调用？Ok,接着往下看如何在窗体里调用。
    首先在窗体里放置两个命令按钮（不要告诉我你不会放啊~），然后编写以下源码
/// <summary>
 /// 调用源码
 /// </summary>
      private void button2_Click_1(object sender, System.EventArgs e)
  {
   string []FileProperties=new string[2];
   FileProperties[0]="C:\unzipped\";//待压缩文件目录
   FileProperties[1]="C:\zip\a.zip";  //压缩后的目标文件
   ZipClass Zc=new ZipClass();
   Zc.ZipFileMain(FileProperties);
  }
     private void button2_Click(object sender, System.EventArgs e)
  {
   string []FileProperties=new string[2];
   FileProperties[0]="C:\zip\test.zip";//待解压的文件
   FileProperties[1]="C:\unzipped\";//解压后放置的目标目录
   UnZipClass UnZc=new UnZipClass();
   UnZc.UnZip(FileProperties);
  }

------------------------------------------------------------------------------------------------------------------

 /// <summary>
 /// 压缩文件
 /// </summary>
using System;
using System.IO;
using ICSharpCode.SharpZipLib.Checksums;
using ICSharpCode.SharpZipLib.Zip;
using ICSharpCode.SharpZipLib.GZip;
namespace Compression
{
 public class ZipClass
 {
 
  public void ZipFile(string FileToZip, string ZipedFile ,int CompressionLevel, int BlockSize)
  {
   //如果文件没有找到，则报错
   if (! System.IO.File.Exists(FileToZip)) 
   {
    throw new System.IO.FileNotFoundException("The specified file " + FileToZip + " could not be found. Zipping aborderd");
   }
  
   System.IO.FileStream StreamToZip = new System.IO.FileStream(FileToZip,System.IO.FileMode.Open , System.IO.FileAccess.Read);
   System.IO.FileStream ZipFile = System.IO.File.Create(ZipedFile);
   ZipOutputStream ZipStream = new ZipOutputStream(ZipFile);
   ZipEntry ZipEntry = new ZipEntry("ZippedFile");
   ZipStream.PutNextEntry(ZipEntry);
   ZipStream.SetLevel(CompressionLevel);
   byte[] buffer = new byte[BlockSize];
   System.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;
    }
   } 
   catch(System.Exception ex)
   {
    throw ex;
   }
   ZipStream.Finish();
   ZipStream.Close();
   StreamToZip.Close();
  }
 
  public void ZipFileMain(string[] args)
  {
   string[] filenames = Directory.GetFiles(args[0]);
  
   Crc32 crc = new Crc32();
   ZipOutputStream s = new ZipOutputStream(File.Create(args[1]));
  
   s.SetLevel(6); // 0 - store only to 9 - means best compression
  
   foreach (string file in filenames) 
   {
    //打开压缩文件
    FileStream fs = File.OpenRead(file);
   
    byte[] buffer = new byte[fs.Length];
    fs.Read(buffer, 0, buffer.Length);
    ZipEntry entry = new ZipEntry(file);
   
    entry.DateTime = DateTime.Now;
   
    // set Size and the crc, because the information
    // about the size and crc should be stored in the header
    // if it is not set it is automatically written in the footer.
    // (in this case size == crc == -1 in the header)
    // Some ZIP programs have problems with zip files that don't store
    // the size and crc in the header.
    entry.Size = fs.Length;
    fs.Close();
   
    crc.Reset();
    crc.Update(buffer);
   
    entry.Crc  = crc.Value;
   
    s.PutNextEntry(entry);
   
    s.Write(buffer, 0, buffer.Length);
   
   }
  
   s.Finish();
   s.Close();
  }
 }
}
现在再来看看解压文件类的源码
 /// <summary>
 /// 解压文件
 /// </summary>
using System;
using System.Text;
using System.Collections;
using System.IO;
using System.Diagnostics;
using System.Runtime.Serialization.Formatters.Binary;
using System.Data;
using ICSharpCode.SharpZipLib.BZip2;
using ICSharpCode.SharpZipLib.Zip;
using ICSharpCode.SharpZipLib.Zip.Compression;
using ICSharpCode.SharpZipLib.Zip.Compression.Streams;
using ICSharpCode.SharpZipLib.GZip;
namespace DeCompression
{
 public class UnZipClass
 {   
  public void UnZip(string[] args)
  {
   ZipInputStream s = new ZipInputStream(File.OpenRead(args[0]));
  
   ZipEntry theEntry;
   while ((theEntry = s.GetNextEntry()) != null) 
   {
   
          string directoryName = Path.GetDirectoryName(args[1]);
    string fileName      = Path.GetFileName(theEntry.Name);
   
    //生成解压目录
    Directory.CreateDirectory(directoryName);
   
    if (fileName != String.Empty) 
    {   
     //解压文件到指定的目录
     FileStream streamWriter = File.Create(args[1]+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();
  }
 }
}
    有了压缩和解压缩的类以后，就要在窗体里调用了。怎么？是新手，不会调用？Ok,接着往下看如何在窗体里调用。
    首先在窗体里放置两个命令按钮（不要告诉我你不会放啊~），然后编写以下源码
/// <summary>
 /// 调用源码
 /// </summary>
      private void button2_Click_1(object sender, System.EventArgs e)
  {
   string []FileProperties=new string[2];
   FileProperties[0]="C:\unzipped\";//待压缩文件目录
   FileProperties[1]="C:\zip\a.zip";  //压缩后的目标文件
   ZipClass Zc=new ZipClass();
   Zc.ZipFileMain(FileProperties);
  }
     private void button2_Click(object sender, System.EventArgs e)
  {
   string []FileProperties=new string[2];
   FileProperties[0]="C:\zip\test.zip";//待解压的文件
   FileProperties[1]="C:\unzipped\";//解压后放置的目标目录
   UnZipClass UnZc=new UnZipClass();
   UnZc.UnZip(FileProperties);
  }

示例二：

/// <summary>
/// Zip 压缩文件
/// </summary>
public class Zip
{
    public Zip()
    {
        
    }
    #region 加压方法
    /// <summary>
    /// 功能：压缩文件（暂时只压缩文件夹下一级目录中的文件，文件夹及其子级被忽略）
    /// </summary>
    /// <param name="dirPath">被压缩的文件夹夹路径</param>
    /// <param name="zipFilePath">生成压缩文件的路径，为空则默认与被压缩文件夹同一级目录，名称为：文件夹名+.zip</param>
    /// <param name="err">出错信息</param>
    /// <returns>是否压缩成功</returns>
    public static bool ZipFile(string dirPath, string zipFilePath, out string err)
    {
        err = "";
        if (dirPath == string.Empty)
        {
            err = "要压缩的文件夹不能为空！";
            return false;
        }
        if (!Directory.Exists(dirPath))
        {
            err = "要压缩的文件夹不存在！";
            return false;
        }
        //压缩文件名为空时使用文件夹名＋.zip
        if (zipFilePath == string.Empty)
        {
            if (dirPath.EndsWith("//"))
            {
                dirPath = dirPath.Substring(0, dirPath.Length - 1);
            }
            zipFilePath = dirPath + ".zip";
        }

        try
        {
            string[] filenames = Directory.GetFiles(dirPath);
            using (ZipOutputStream s = new ZipOutputStream(File.Create(zipFilePath)))
            {
                s.SetLevel(9);
                byte[] buffer = new byte[4096];
                foreach (string file in filenames)
                {
                    ZipEntry entry = new ZipEntry(Path.GetFileName(file));
                    entry.DateTime = DateTime.Now;
                    s.PutNextEntry(entry);
                    using (FileStream fs = File.OpenRead(file))
                    {
                        int sourceBytes;
                        do
                        {
                            sourceBytes = fs.Read(buffer, 0, buffer.Length);
                            s.Write(buffer, 0, sourceBytes);
                        } while (sourceBytes > 0);
                    }
                }
                s.Finish();
                s.Close();
            }
        }
        catch (Exception ex)
        {
            err = ex.Message;
            return false;
        }
        return true;
    }
    #endregion 

    #region 解压
    /// <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>
    /// <param name="err">出错信息</param>
    /// <returns>解压是否成功</returns>
    public static bool UnZipFile(string zipFilePath, string unZipDir, out string err)
    {
        err = "";
        if (zipFilePath == string.Empty)
        {
            err = "压缩文件不能为空！";
            return false;
        }
        if (!File.Exists(zipFilePath))
        {
            err = "压缩文件不存在！";
            return false;
        }
        //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);

        try
        {
            using (ZipInputStream 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 (directoryName.Length > 0)
                    {
                        Directory.CreateDirectory(unZipDir + directoryName);
                    }
                    if (!directoryName.EndsWith("//"))
                        directoryName += "//";
                    if (fileName != String.Empty)
                    {
                        using (FileStream streamWriter = File.Create(unZipDir + 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;
                                }
                            }
                        }
                    }
                }//while
            }
        }
        catch (Exception ex)
        {
            err = ex.Message;
            return false;
        }
        return true;
    }//解压结束
    #endregion

事例源码：http://files.cnblogs.com/greatverve/SharpZipLib_0860_Bin.zip

------------------------------------------------------------------------------------------------------------ 

C#自带源码：http://files.cnblogs.com/greatverve/Compress.rar
------------------------------------------------------------------------------------------------------------

System.IO.Compression 命名空间  
 注意：此命名空间在 .NET Framework 2.0 版中是新增的。 
System.IO.Compression 命名空间包含提供基本的流压缩和解压缩服务的类。 
(downmoon原作)
  类                               说明 
 DeflateStream         提供用于使用 Deflate 算法压缩和解压缩流的方法和属性。 
 GZipStream             提供用于压缩和解压缩流的方法和属性。 
  枚举                         说明 
 CompressionMode 指定是否压缩或解压缩基础流。 

下面以 GZipStream  为例说明 


注意：此类在 .NET Framework 2.0 版中是新增的。 

提供用于压缩和解压缩流的方法和属性。 
命名空间:System.IO.Compression
程序集:System（在 system.dll 中）
语法
Visual Basic（声明） 
Public Class GZipStream
    Inherits Stream
 Visual Basic（用法） 
Dim instance As GZipStream
 
C# 
public class GZipStream : Stream
 
C++ 
public ref class GZipStream : public Stream
 
J# 
public class GZipStream extends Stream
 
JScript 
public class GZipStream extends Stream
 

备注
此 类表示 GZip 数据格式，它使用无损压缩和解压缩文件的行业标准算法。这种格式包括一个检测数据损坏的循环冗余校验值。GZip 数据格式使用的算法与 DeflateStream 类的算法相同，但它可以扩展以使用其他压缩格式。这种格式可以通过不涉及专利使用权的方式轻松实现。gzip 的格式可以从 RFC 1952“GZIP file format specification 4.3（GZIP 文件格式规范 4.3）GZIP file format specification 4.3（GZIP 文件格式规范 4.3）”中获得。此类不能用于压缩大于 4 GB 的文件。

给继承者的说明 当从 GZipStream 继承时，必须重写下列成员：CanSeek、CanWrite 和 CanRead。 


下面提供 一个完整的压缩与解压类(downmoon原作 )：

 

class clsZip
    {
        public void CompressFile ( string sourceFile, string destinationFile )
        {
            // make sure the source file is there
            if ( File.Exists ( sourceFile ) == false )
                throw new FileNotFoundException ( );

            // Create the streams and byte arrays needed
            byte[] buffer = null;
            FileStream sourceStream = null;
            FileStream destinationStream = null;
            GZipStream compressedStream = null;

            try
            {
                // Read the bytes from the source file into a byte array
                sourceStream = new FileStream ( sourceFile, FileMode.Open, FileAccess.Read, FileShare.Read );

                // Read the source stream values into the buffer
                buffer = new byte[sourceStream.Length];
                int checkCounter = sourceStream.Read ( buffer, 0, buffer.Length );

                if ( checkCounter != buffer.Length )
                {
                    throw new ApplicationException ( );
                }

                // Open the FileStream to write to
                destinationStream = new FileStream ( destinationFile, FileMode.OpenOrCreate, FileAccess.Write );

                // Create a compression stream pointing to the destiantion stream
                compressedStream = new GZipStream ( destinationStream, CompressionMode.Compress, true );

                // Now write the compressed data to the destination file
                compressedStream.Write ( buffer, 0, buffer.Length );
            }
            catch ( ApplicationException ex )
            {
                MessageBox.Show ( ex.Message, "压缩文件时发生错误：", MessageBoxButtons.OK, MessageBoxIcon.Error );
            }
            finally
            {
                // Make sure we allways close all streams
                if ( sourceStream != null )
                    sourceStream.Close ( );

                if ( compressedStream != null )
                    compressedStream.Close ( );

                if ( destinationStream != null )
                    destinationStream.Close ( );
            }
        }

        public void DecompressFile ( string sourceFile, string destinationFile )
        {
            // make sure the source file is there
            if ( File.Exists ( sourceFile ) == false )
                throw new FileNotFoundException ( );

            // Create the streams and byte arrays needed
            FileStream sourceStream = null;
            FileStream destinationStream = null;
            GZipStream decompressedStream = null;
            byte[] quartetBuffer = null;

            try
            {
                // Read in the compressed source stream
                sourceStream = new FileStream ( sourceFile, FileMode.Open );

                // Create a compression stream pointing to the destiantion stream
                decompressedStream = new GZipStream ( sourceStream, CompressionMode.Decompress, true );

                // Read the footer to determine the length of the destiantion file
                quartetBuffer = new byte[4];
                int position = (int)sourceStream.Length - 4;
                sourceStream.Position = position;
                sourceStream.Read ( quartetBuffer, 0, 4 );
                sourceStream.Position = 0;
                int checkLength = BitConverter.ToInt32 ( quartetBuffer, 0 );

                byte[] buffer = new byte[checkLength + 100];

                int offset = 0;
                int total = 0;

                // Read the compressed data into the buffer
                while ( true )
                {
                    int bytesRead = decompressedStream.Read ( buffer, offset, 100 );

                    if ( bytesRead == 0 )
                        break;

                    offset += bytesRead;
                    total += bytesRead;
                }

                // Now write everything to the destination file
                destinationStream = new FileStream ( destinationFile, FileMode.Create );
                destinationStream.Write ( buffer, 0, total );

                // and flush everyhting to clean out the buffer
                destinationStream.Flush ( );
            }
            catch ( ApplicationException ex )
            {
                MessageBox.Show(ex.Message, "解压文件时发生错误：", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            finally
            {
                // Make sure we allways close all streams
                if ( sourceStream != null )
                    sourceStream.Close ( );

                if ( decompressedStream != null )
                    decompressedStream.Close ( );

                if ( destinationStream != null )
                    destinationStream.Close ( );
            }

        }
    }

url:http://greatverve.cnblogs.com/archive/2011/12/26/csharp-zip.html

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www.cnblogs.com/Bonker/archive/2012/12/25/2831970.htmlhttp://www.cnblogs.com/Bonker/archive/2012/12/25/2831970.html