目前网上的一些代码有的无法加压空文件夹，有的加压了用rar解不开，这是一点需要改进的。
但如果只需要加压文件夹第一级子目录中的“文件”（不包括文件夹和子目录）的情况，使用这个库是很方便的。而且是正常zip格式。
比.Net提供的GZipStream类强在它可以按照标准zip格式加压多个文件，而GZipStream没有提供加压多个文件的方法，需要自己定义，
这样解压也只有使用自己的程序才可以，通用性方面不如SharpZipLib。
官方链接
using System;
using System.IO;
using ICSharpCode.SharpZipLib.Zip;namespace Chinull
{
/// <summary>
///
/// 利用 ICSharpCode.SharpZipLib（0.85.5.452）进行压缩与解压缩的帮助类
///
/// <example>
/// 使用方法如下：
/// 压缩：
/// SharpZipHelper.ZipFile
/// (
/// "C:\\test\\",
/// new string[] {
/// "bin\\ICSharpCode.SharpZipLib.dll",
/// "bin\\ICSharpCode.SharpZipLib.pdb",
/// "bin\\ICSharpCode.SharpZipLib.xml",
/// "bin\\ziplist.exe",
/// "bin\\ziplist.vshost.exe",
/// "bin\\ziplist.pdb"
/// },
/// "test.zip",
/// 9,
/// "chinull",
/// "测试压缩程序"
/// );
/// 解压缩：
/// SharpZipHelper.UnZipFile("test.zip", "C:\\bin0\\", "chinull");
/// </example>
/// </summary>
public class SharpZipHelper
{
/// <summary>
/// 压缩指定文件生成ZIP文件
/// </summary>
/// <param name="topDirName">顶层文件夹名称</param>
/// <param name="fileNamesToZip">待压缩文件列表</param>
/// <param name="ZipedFileName">ZIP文件</param>
/// <param name="CompressionLevel">压缩比</param>
/// <param name="password">密码</param>
/// <param name="comment">压缩文件注释文字</param>
public static void ZipFile
(
string topDirName,
string[] fileNamesToZip,
string ZipedFileName,
int CompressionLevel,
string password,
string comment
)
{
ZipOutputStream s = new ZipOutputStream(System.IO.File.Open(ZipedFileName, FileMode.Create));
if(password != null && password.Length > 0)
s.Password = password;
if(comment != null && comment.Length >0)
s.SetComment(comment);
s.SetLevel(CompressionLevel); // 0 - means store only to 9 - means best compressionforeach (string file in fileNamesToZip)
{
FileStream fs = File.OpenRead(topDirName + file); //打开待压缩文件
byte[] buffer = new byte[fs.Length];
fs.Read(buffer, 0, buffer.Length); //读取文件流
ZipEntry entry = new ZipEntry(file); //新建实例entry.DateTime = DateTime.Now;
entry.Size = fs.Length;
fs.Close();s.PutNextEntry(entry);
s.Write(buffer, 0, buffer.Length);
}
s.Finish();
s.Close();
}/// <summary>
/// 解压缩ZIP文件到指定文件夹
/// </summary>
/// <param name="zipfileName">ZIP文件</param>
/// <param name="UnZipDir">解压文件夹</param>
/// <param name="password">压缩文件密码</param>
public static void UnZipFile(string zipfileName, string UnZipDir, string password)
{
ZipInputStream s = new ZipInputStream(File.OpenRead(zipfileName));
if (password != null && password.Length > 0)
s.Password = password;
try
{
ZipEntry theEntry;
while ((theEntry = s.GetNextEntry()) != null)
{
string directoryName = Path.GetDirectoryName(UnZipDir);
string pathname = Path.GetDirectoryName(theEntry.Name);
string fileName = Path.GetFileName(theEntry.Name);//生成解压目录
pathname = pathname.Replace(":", "$");//处理压缩时带有盘符的问题
directoryName = directoryName + "\\" + pathname;
Directory.CreateDirectory(directoryName);if (fileName != String.Empty)
{
//解压文件到指定的目录
FileStream streamWriter = File.Create(directoryName + "\\" + fileName);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();
}
catch (Exception eu)
{
throw eu;
}
finally
{
s.Close();
}}
}
}