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.htmlC# 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
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);
}
------------------------------------------------------------------------------------------------------------------
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
------------------------------------------------------------------------------------------------------------
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。
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 ( );
}
}
}
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 )：
url:http://greatverve.cnblogs.com/archive/2011/12/26/csharp-zip.html
程序员的网店：http://shop108042866.taobao.com呵呵
凡事以大气象去面对，优秀是一种习惯。
www.cnblogs.com/Bonker/archive/2012/12/25/2831970.htmlhttp://www.cnblogs.com/Bonker/archive/2012/12/25/2831970.html