在工作中遇到需要用到压缩和解压文件的技术,于是在网上找了很多相关资料和demo,发现有很多不能直接使用,有很多问题,压缩出来的要么是空文件,要门是损坏文件,甚至有些直接编译不通过。综合了多位大牛的资料,我整理测试了一个压缩/解压的类文件,分享给大家。亲测可用~~~~
这里需要添加一个dll引用ICSharpCode.SharpZipLib.dll,点这里下载
需要注意的是:这个类只能操作ZIP格式的压缩文件,操作rar格式会有这样的报错:Wrong Local header signature: 0x21726152
1、下载解压
2、引用SharpZipLib.dll到项目中,在项目中点击项目右键-->添加引用-->浏览,找到刚解压的ICSharpCode.SharpZipLib.dll-->确认。
3、增加命名空间的引用。
<pre name="code" class="csharp"><span style="font-size:18px;">#region 命名空间的引用
using ICSharpCode.SharpZipLib;
using ICSharpCode.SharpZipLib.Zip;
using ICSharpCode.SharpZipLib.Checksums;
using System.IO;
#endregion</span>
下面是类文件内容
<span style="font-size:18px;">public static class DealZip
{
#region 压缩
#region 公开压缩方法
/// <summary>
/// 压缩文件或文件夹 ----带密码
/// </summary>
/// <param name="fileToZip">要压缩的路径-文件夹或者文件</param>
/// <param name="zipedFile">压缩后的文件名</param>
/// <param name="password">密码</param>
/// <param name="errorOut">如果失败返回失败信息</param>
/// <returns>压缩结果</returns>
public static bool Zip(string fileToZip, string zipedFile, string password, ref string errorOut)
{
bool result = false;
try
{
if (Directory.Exists(fileToZip))
result = ZipDirectory(fileToZip, zipedFile, password);
else if (File.Exists(fileToZip))
result = ZipFile(fileToZip, zipedFile, password);
}
catch (Exception ex)
{
errorOut = ex.Message;
}
return result;
}
/// <summary>
/// 压缩文件或文件夹 ----无密码
/// </summary>
/// <param name="fileToZip">要压缩的路径-文件夹或者文件</param>
/// <param name="zipedFile">压缩后的文件名</param>
/// <param name="errorOut">如果失败返回失败信息</param>
/// <returns>压缩结果</returns>
public static bool Zip(string fileToZip, string zipedFile, ref string errorOut)
{
bool result = false;
try
{
if (Directory.Exists(fileToZip))
result = ZipDirectory(fileToZip, zipedFile, null);
else if (File.Exists(fileToZip))
result = ZipFile(fileToZip, zipedFile, null);
}
catch (Exception ex)
{
errorOut = ex.Message;
}
return result;
}
#endregion
#region 内部处理方法
/// <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>
private 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 (Exception ex)
{
result = false;
throw ex;
}
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>
/// 压缩文件夹
/// </summary>
/// <param name="strFile">带压缩的文件夹目录</param>
/// <param name="strZip">压缩后的文件名</param>
/// <param name="password">压缩密码</param>
/// <returns>是否压缩成功</returns>
private static bool ZipDirectory(string strFile, string strZip, string password)
{
bool result = false;
if (!Directory.Exists(strFile)) return false;
if (strFile[strFile.Length - 1] != Path.DirectorySeparatorChar)
strFile += Path.DirectorySeparatorChar;
ZipOutputStream s = new ZipOutputStream(File.Create(strZip));
s.SetLevel(6); // 0 - store only to 9 - means best compression
if (!string.IsNullOrEmpty(password)) s.Password = password;
try
{
result = zip(strFile, s, strFile);
}
catch (Exception ex)
{
throw ex;
}
finally
{
s.Finish();
s.Close();
}
return result;
}
/// <summary>
/// 压缩文件夹内部方法
/// </summary>
/// <param name="strFile"></param>
/// <param name="s"></param>
/// <param name="staticFile"></param>
/// <returns></returns>
private static bool zip(string strFile, ZipOutputStream s, string staticFile)
{
bool result = true;
if (strFile[strFile.Length - 1] != Path.DirectorySeparatorChar) strFile += Path.DirectorySeparatorChar;
Crc32 crc = new Crc32();
try
{
string[] filenames = Directory.GetFileSystemEntries(strFile);
foreach (string file in filenames)
{
if (Directory.Exists(file))
{
zip(file, s, staticFile);
}
else // 否则直接压缩文件
{
//打开压缩文件
FileStream fs = File.OpenRead(file);
byte[] buffer = new byte[fs.Length];
fs.Read(buffer, 0, buffer.Length);
string tempfile = file.Substring(staticFile.LastIndexOf("\\") + 1);
ZipEntry entry = new ZipEntry(tempfile);
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 (Exception ex)
{
result = false;
throw ex;
}
return result;
}
#endregion
#endregion
#region 解压
#region 公开解压方法
/// <summary>
/// 解压功能(解压压缩文件到指定目录)---->不需要密码
/// </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="errorOut">如果失败返回失败信息</param>
/// <returns>解压结果</returns>
public static bool UPZipFile(string fileToUnZip, string zipedFolder, ref string errorOut)
{
bool result = false;
try
{
result = UPZipFileByPassword(fileToUnZip, zipedFolder, null);
}
catch (Exception ex)
{
errorOut = ex.Message;
}
return result;
}
/// <summary>
/// 解压功能(解压压缩文件到指定目录)---->需要密码
/// </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>
/// <param name="errorOut">如果失败返回失败信息</param>
/// <returns>解压结果</returns>
public static bool UPZipFile(string fileToUnZip, string zipedFolder, string password, ref string errorOut)
{
bool result = false;
try
{
result = UPZipFileByPassword(fileToUnZip, zipedFolder, password);
}
catch (Exception ex)
{
errorOut = ex.Message;
}
return result;
}
#endregion
#region 内部处理方法
/// <summary>
/// 解压功能 内部处理方法
/// </summary>
/// <param name="TargetFile">待解压的文件</param>
/// <param name="fileDir">指定解压目标目录</param>
/// <param name="password">密码</param>
/// <returns>成功返回true</returns>
private static bool UPZipFileByPassword(string TargetFile, string fileDir, string password)
{
bool rootFile = true;
try
{
//读取压缩文件(zip文件),准备解压缩
ZipInputStream zipStream = new ZipInputStream(File.OpenRead(TargetFile.Trim()));
ZipEntry theEntry;
string path = fileDir;
string rootDir = " ";
if (!string.IsNullOrEmpty(password)) zipStream.Password = password;
while ((theEntry = zipStream.GetNextEntry()) != null)
{
rootDir = Path.GetDirectoryName(theEntry.Name);
if (rootDir.IndexOf("\\") >= 0)
{
rootDir = rootDir.Substring(0, rootDir.IndexOf("\\") + 1);
}
string dir = Path.GetDirectoryName(theEntry.Name);
string fileName = Path.GetFileName(theEntry.Name);
if (dir != " ")
{
if (!Directory.Exists(fileDir + "\\" + dir))
{
path = fileDir + "\\" + dir;
Directory.CreateDirectory(path);
}
}
else if (dir == " " && fileName != "")
{
path = fileDir;
}
else if (dir != " " && fileName != "")
{
if (dir.IndexOf("\\") > 0)
{
path = fileDir + "\\" + dir;
}
}
if (dir == rootDir)
{
path = fileDir + "\\" + rootDir;
}
//以下为解压缩zip文件的基本步骤
//基本思路就是遍历压缩文件里的所有文件,创建一个相同的文件。
if (fileName != String.Empty)
{
FileStream streamWriter = File.Create(path + "\\" + fileName);
int size = 2048;
byte[] data = new byte[2048];
while (true)
{
size = zipStream.Read(data, 0, data.Length);
if (size > 0)
{
streamWriter.Write(data, 0, size);
}
else
{
break;
}
}
streamWriter.Close();
}
}
if (theEntry != null)
{
theEntry = null;
}
if (zipStream != null)
{
zipStream.Close();
}
}
catch (Exception ex)
{
rootFile = false;
throw ex;
}
finally
{
GC.Collect();
GC.Collect(1);
}
return rootFile;
}
#endregion
#endregion
}</span>
类文件下载: DealZip
参考文章:http://www.cnblogs.com/sunyaling/archive/2009/04/13/1434602.html
http://blog.youkuaiyun.com/cleopard/article/details/42156393

本文介绍如何在C#中使用ICSharpCode.SharpZipLib库进行ZIP文件的压缩和解压操作,包括下载DLL、添加引用及使用示例。亲测有效。
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