C#压缩解压zip 文件

首先需要在项目里引用SharpZipLib.dll。(http://www.icsharpcode.net)

示例一

/// <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