C#实现Zip压缩解压实例

本文只列举一个压缩帮助类，使用的是有要添加一个dll引用ICSharpCode.SharpZipLib.dll【下载地址】。

这个类压缩格式是ZIP的，文件后缀写成 .zip。如果用这个类来解压rar格式的压缩文件时会报错。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using ICSharpCode.SharpZipLib;
using ICSharpCode.SharpZipLib.Zip;
using ICSharpCode.SharpZipLib.Checksums;

namespace CLeopardZip
{
/// <summary>
/// 适用与ZIP压缩
/// </summary>
public class ZipHelper
{
#region 压缩

/// <summary>
/// 递归压缩文件夹的内部方法
/// </summary>
/// <param name="folderToZip">要压缩的文件夹路径</param>
/// <param name="zipStream">压缩输出流</param>
/// <param name="parentFolderName">此文件夹的上级文件夹</param>
/// <returns></returns>
private static bool ZipDirectory(string folderToZip, ZipOutputStream zipStream, string parentFolderName)
{
bool result = true;
string[] folders, files;
ZipEntry ent = null;
FileStream fs = null;
Crc32 crc = new Crc32();

try
{
ent = new ZipEntry(Path.Combine(parentFolderName, Path.GetFileName(folderToZip) + "/"));
zipStream.PutNextEntry(ent);
zipStream.Flush();

files = Directory.GetFiles(folderToZip);
foreach (string file in files)
{
fs = File.OpenRead(file);

byte[] buffer = new byte[fs.Length];
fs.Read(buffer, 0, buffer.Length);
ent = new ZipEntry(Path.Combine(parentFolderName, Path.GetFileName(folderToZip) + "/" + Path.GetFileName(file)));
ent.DateTime = DateTime.Now;
ent.Size = fs.Length;

fs.Close();

crc.Reset();
crc.Update(buffer);

ent.Crc = crc.Value;
zipStream.PutNextEntry(ent);
zipStream.Write(buffer, 0, buffer.Length);
}

}
catch
{
result = false;
}
finally
{
if (fs != null)
{
fs.Close();
fs.Dispose();
}
if (ent != null)
{
ent = null;
}
GC.Collect();
GC.Collect(1);
}

folders = Directory.GetDirectories(folderToZip);
foreach (string folder in folders)
if (!ZipDirectory(folder, zipStream, folderToZip))
return false;

return result;
}

/// <summary>
/// 压缩文件夹
/// </summary>
/// <param name="folderToZip">要压缩的文件夹路径</param>
/// <param name="zipedFile">压缩文件完整路径</param>
/// <param name="password">密码</param>
/// <returns>是否压缩成功</returns>
public static bool ZipDirectory(string folderToZip, string zipedFile, string password)
{
bool result = false;
if (!Directory.Exists(folderToZip))
return result;

ZipOutputStream zipStream = new ZipOutputStream(File.Create(zipedFile));
zipStream.SetLevel(6);
if (!string.IsNullOrEmpty(password)) zipStream.Password = password;

result = ZipDirectory(folderToZip, zipStream, "");

zipStream.Finish();
zipStream.Close();

return result;
}

/// <summary>
/// 压缩文件夹
/// </summary>
/// <param name="folderToZip">要压缩的文件夹路径</param>
/// <param name="zipedFile">压缩文件完整路径</param>
/// <returns>是否压缩成功</returns>
public static bool ZipDirectory(string folderToZip, string zipedFile)
{
bool result = ZipDirectory(folderToZip, zipedFile, null);
return result;
}

/// <summary>
/// 压缩文件
/// </summary>
/// <param name="fileToZip">要压缩的文件全名</param>
/// <param name="zipedFile">压缩后的文件名</param>
/// <param name="password">密码</param>
/// <returns>压缩结果</returns>
public static bool ZipFile(string fileToZip, string zipedFile, string password)
{
bool result = true;
ZipOutputStream zipStream = null;
FileStream fs = null;
ZipEntry ent = null;

if (!File.Exists(fileToZip))
return false;

try
{
fs = File.OpenRead(fileToZip);
byte[] buffer = new byte[fs.Length];
fs.Read(buffer, 0, buffer.Length);
fs.Close();

fs = File.Create(zipedFile);
zipStream = new ZipOutputStream(fs);
if (!string.IsNullOrEmpty(password)) zipStream.Password = password;
ent = new ZipEntry(Path.GetFileName(fileToZip));
zipStream.PutNextEntry(ent);
zipStream.SetLevel(6);

zipStream.Write(buffer, 0, buffer.Length);

}
catch
{
result = false;
}
finally
{
if (zipStream != null)
{
zipStream.Finish();
zipStream.Close();
}
if (ent != null)
{
ent = null;
}
if (fs != null)
{
fs.Close();
fs.Dispose();
}
}
GC.Collect();
GC.Collect(1);

return result;
}

/// <summary>
/// 压缩文件
/// </summary>
/// <param name="fileToZip">要压缩的文件全名</param>
/// <param name="zipedFile">压缩后的文件名</param>
/// <returns>压缩结果</returns>
public static bool ZipFile(string fileToZip, string zipedFile)
{
bool result = ZipFile(fileToZip, zipedFile, null);
return result;
}

/// <summary>
/// 压缩文件或文件夹
/// </summary>
/// <param name="fileToZip">要压缩的路径</param>
/// <param name="zipedFile">压缩后的文件名</param>
/// <param name="password">密码</param>
/// <returns>压缩结果</returns>
public static bool Zip(string fileToZip, string zipedFile, string password)
{
bool result = false;
if (Directory.Exists(fileToZip))
result = ZipDirectory(fileToZip, zipedFile, password);
else if (File.Exists(fileToZip))
result = ZipFile(fileToZip, zipedFile, password);

return result;
}

/// <summary>
/// 压缩文件或文件夹
/// </summary>
/// <param name="fileToZip">要压缩的路径</param>
/// <param name="zipedFile">压缩后的文件名</param>
/// <returns>压缩结果</returns>
public static bool Zip(string fileToZip, string zipedFile)
{
bool result = Zip(fileToZip, zipedFile, null);
return result;

}

#endregion

#region 解压

/// <summary>
/// 解压功能(解压压缩文件到指定目录)
/// </summary>
/// <param name="fileToUnZip">待解压的文件</param>
/// <param name="zipedFolder">指定解压目标目录</param>
/// <param name="password">密码</param>
/// <returns>解压结果</returns>
public static bool UnZip(string fileToUnZip, string zipedFolder, string password)
{
bool result = true;
FileStream fs = null;
ZipInputStream zipStream = null;
ZipEntry ent = null;
string fileName;

if (!File.Exists(fileToUnZip))
return false;

if (!Directory.Exists(zipedFolder))
Directory.CreateDirectory(zipedFolder);

try
{
zipStream = new ZipInputStream(File.OpenRead(fileToUnZip));
if (!string.IsNullOrEmpty(password)) zipStream.Password = password;
while ((ent = zipStream.GetNextEntry()) != null)
{
if (!string.IsNullOrEmpty(ent.Name))
{
fileName = Path.Combine(zipedFolder, ent.Name);
fileName = fileName.Replace('/', '\\');//change by Mr.HopeGi

int index = ent.Name.LastIndexOf('/');
if (index != -1 || fileName.EndsWith("\\"))
{
string tmpDir = (index != -1 ? fileName.Substring(0, fileName.LastIndexOf('\\')) : fileName) + "\\";
if (!Directory.Exists(tmpDir))
{
Directory.CreateDirectory(tmpDir);
}
if (tmpDir == fileName)
{
continue;
}
}

fs = File.Create(fileName);
int size = 2048;
byte[] data = new byte[size];
while (true)
{
size = zipStream.Read(data, 0, data.Length);
if (size > 0)
fs.Write(data, 0, data.Length);
else
break;
}
}
}
}
catch
{
result = false;
}
finally
{
if (fs != null)
{
fs.Close();
fs.Dispose();
}
if (zipStream != null)
{
zipStream.Close();
zipStream.Dispose();
}
if (ent != null)
{
ent = null;
}
GC.Collect();
GC.Collect(1);
}
return result;
}

/// <summary>
/// 解压功能(解压压缩文件到指定目录)
/// </summary>
/// <param name="fileToUnZip">待解压的文件</param>
/// <param name="zipedFolder">指定解压目标目录</param>
/// <returns>解压结果</returns>
public static bool UnZip(string fileToUnZip, string zipedFolder)
{
bool result = UnZip(fileToUnZip, zipedFolder, null);
return result;
}

#endregion
}
}

View Code

这个不同于之前用的zip压缩类，压缩后文件不会乱码。

补充：UnZip方法修复，解决压缩包内包含文件夹，可能没有优先创建文件夹，从而报错【未能找到路径“”的一部分。】