一、使用ICSharpCode.SharpZipLib.dll；

下载地址

http://www.icsharpcode.net/OpenSource/SharpZipLib/Download.aspx

二、基于（ICSharpCode.SharpZipLib.dll）的文件压缩方法，类文件

压缩文件

using System; using System.IO; using System.Collections; using ICSharpCode.SharpZipLib.Checksums; using ICSharpCode.SharpZipLib.Zip; namespace FileCompress { /// <summary> /// 功能：压缩文件 /// creator chaodongwang 2009-11-11 /// </summary> public class ZipClass { /// <summary> /// 压缩单个文件 /// </summary> /// <param name="FileToZip">被压缩的文件名称(包含文件路径)</param> /// <param name="ZipedFile">压缩后的文件名称(包含文件路径)</param> /// <param name="CompressionLevel">压缩率0（无压缩）-9（压缩率最高）</param> /// <param name="BlockSize">缓存大小</param> public void ZipFile(string FileToZip, string ZipedFile, int CompressionLevel) { //如果文件没有找到，则报错 if (!System.IO.File.Exists(FileToZip)) { throw new System.IO.FileNotFoundException("文件：" + FileToZip + "没有找到！"); } if (ZipedFile == string.Empty) { ZipedFile = Path.GetFileNameWithoutExtens<wbr>ion(FileToZip) + ".zip"; } if (Path.GetExtension(ZipedFile) != ".zip") { ZipedFile = ZipedFile + ".zip"; } 如果指定位置目录不存在，创建该目录 //string zipedDir = ZipedFile.Substring(0,ZipedFile.LastIndexOf("/")); //if (!Directory.Exists(zipedDir)) // Directory.CreateDirectory(zipedDir); //被压缩文件名称 string filename = FileToZip.Substring(FileToZip.LastIndexOf('//') + 1); 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(filename); ZipStream.PutNextEntry(ZipEntry); ZipStream.SetLevel(CompressionLevel); byte[] buffer = new byte[2048]; 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; } finally { ZipStream.Finish(); ZipStream.Close(); StreamToZip.Close(); } } /// <summary> /// 压缩文件夹的方法 /// </summary> public void ZipDir(string DirToZip, string ZipedFile, int CompressionLevel) { //压缩文件为空时默认与压缩文件夹同一级目录 if (ZipedFile == string.Empty) { ZipedFile = DirToZip.Substring(DirToZip.LastIndexOf("/") + 1); ZipedFile = DirToZip.Substring(0, DirToZip.LastIndexOf("/")) +"/"+ ZipedFile+".zip"; } if (Path.GetExtension(ZipedFile) != ".zip") { ZipedFile = ZipedFile + ".zip"; } using (ZipOutputStream zipoutputstream = new ZipOutputStream(File.Create(ZipedFile))) { zipoutputstream.SetLevel(CompressionLevel); Crc32 crc = new Crc32(); Hashtable fileList = getAllFies(DirToZip); foreach (DictionaryEntry item in fileList) { FileStream fs = File.OpenRead(item.Key.ToString()); byte[] buffer = new byte[fs.Length]; fs.Read(buffer, 0, buffer.Length); ZipEntry entry = new ZipEntry(item.Key.ToString().Substring(DirToZip.Length + 1)); entry.DateTime = (DateTime)item.Value; entry.Size = fs.Length; fs.Close(); crc.Reset(); crc.Update(buffer); entry.Crc = crc.Value; zipoutputstream.PutNextEntry(entry); zipoutputstream.Write(buffer, 0, buffer.Length); } } } /// <summary> /// 获取所有文件 /// </summary> /// <returns></returns> private Hashtable getAllFies(string dir) { Hashtable FilesList = new Hashtable(); DirectoryInfo fileDire = new DirectoryInfo(dir); if (!fileDire.Exists) { throw new System.IO.FileNotFoundException("目录:" + fileDire.FullName + "没有找到!"); } this.getAllDirFiles(fileDire, FilesList); this.getAllDirsFiles(fileDire.GetDirectories(), FilesList); return FilesList; } /// <summary> /// 获取一个文件夹下的所有文件夹里的文件 /// </summary> /// <param name="dirs"></param> /// <param name="filesList"></param> private void getAllDirsFiles(DirectoryInfo[] dirs, Hashtable filesList) { foreach (DirectoryInfo dir in dirs) { foreach (FileInfo file in dir.GetFiles("*.*")) { filesList.Add(file.FullName, file.LastWriteTime); } this.getAllDirsFiles(dir.GetDirectories(), filesList); } } /// <summary> /// 获取一个文件夹下的文件 /// </summary> /// <param name="strDirName">目录名称</param> /// <param name="filesList">文件列表HastTable</param> private void getAllDirFiles(DirectoryInfo dir, Hashtable filesList) { foreach (FileInfo file in dir.GetFiles("*.*")) { filesList.Add(file.FullName, file.LastWriteTime); } } } }

解压文件