最近要做一个项目涉及到C#中压缩与解压缩的问题的解决方法,大家分享。这里主要解决文件夹包含文件夹的解压缩问题。）下载SharpZipLib.dll,在http://www.icsharpcode.net/OpenSource/SharpZipLib/Download.aspx中有最新免费版本,“Assemblies for .NET 1.1, .NET 2.0, .NET CF 1.0, .NET CF 2.0： Download [297 KB] ”点击Download可以下载,解压后里边有好多文件夹,因为不同的版本,我用的FW2.0。）引用SharpZipLib.dll,在项目中点击项目右键-->添加引用-->浏览,找到要添加的DLL-->确认）改写了文件压缩和解压缩的两个类,新建两个类名字为ZipFloClass.cs,UnZipFloClass.cs压缩文件夹源码如下using System;using System.Data;using System.Configuration;using System.Web;using System.Web.Security;using System.Web.UI;using System.IO;using ICSharpCode.SharpZipLib.Checksums;using ICSharpCode.SharpZipLib.Zip;using ICSharpCode.SharpZipLib.GZip;////// ZipFloClass 的摘要说明///public class ZipFloClass{    public void ZipFile(string strFile, string strZip)    {        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        zip(strFile, s, strFile);        s.Finish();        s.Close();    }    private void zip(string strFile, ZipOutputStream s, string staticFile)    {        if (strFile[strFile.Length - 1] != Path.DirectorySeparatorChar) strFile += Path.DirectorySeparatorChar;        Crc32 crc = new Crc32();        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);            }        }    }}解压文件夹using System;using System.Data;using System.Web;using System.Text;using System.Collections;using System.IO;using System.Diagnostics;using System.Runtime.Serialization.Formatters.Binary;using ICSharpCode.SharpZipLib.BZip2;using ICSharpCode.SharpZipLib.Zip;using ICSharpCode.SharpZipLib.Zip.Compression;using ICSharpCode.SharpZipLib.Zip.Compression.Streams;using ICSharpCode.SharpZipLib.GZip;using ICSharpCode.SharpZipLib.Checksums;////// UnZipFloClass 的摘要说明///public class UnZipFloClass{    public string unZipFile(string TargetFile, string fileDir)    {        string rootFile = " ";        try        {            //读取压缩文件(zip文件),准备解压缩            ZipInputStream s = new ZipInputStream(File.OpenRead(TargetFile.Trim()));            ZipEntry theEntry;            string path = fileDir;                               //解压出来的文件保存的路径            string rootDir = " ";                                    //根目录下的第一个子文件夹的名称            while ((theEntry = s.GetNextEntry()) != null)            {                rootDir = Path.GetDirectoryName(theEntry.Name);                                          //得到根目录下的第一级子文件夹的名称                if (rootDir.IndexOf("\\") >= 0)                {                    rootDir = rootDir.Substring(0, rootDir.IndexOf("\\") + 1);                }                string dir = Path.GetDirectoryName(theEntry.Name);                                    //根目录下的第一级子文件夹的下的文件夹的名称                string fileName = Path.GetFileName(theEntry.Name);                                    //根目录下的文件名称                if (dir != " " )                                                                            //创建根目录下的子文件夹,不限制级别                {                    if (!Directory.Exists(fileDir + "\\" + dir))                    {                        path = fileDir + "\\" + dir;                                                                        //在指定的路径创建文件夹                        Directory.CreateDirectory(path);                    }                }                else if (dir == " " && fileName != "")                                                                  //根目录下的文件                {                    path = fileDir;                    rootFile = fileName;                }                else if (dir != " " && fileName != "")                                                                  //根目录下的第一级子文件夹下的文件                {                    if (dir.IndexOf("\\") > 0)                                                                                    //指定文件保存的路径                    {                        path = fileDir + "\\" + dir;                    }                }                if (dir == rootDir)                                                                                                      //判断是不是需要保存在根目录下的文件                {                    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 = http://www.mamicode.com/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();            return rootFile;        }        catch (Exception ex)        {            return "1; " + ex.Message;        }    }   }

 /// <summary>        /// 压缩        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void button1_Click(object sender, EventArgs e)        {            string[] FileProperties = new string[2];            FileProperties[0] = "D:\\Debug\\";//待压缩文件目录            //Debug2=>目录必须存在(可以改进程序)            FileProperties[1] = "D:\\Debug2\\a.zip";  //压缩后的目标文件            ZipFloClass Zc = new ZipFloClass();            Zc.ZipFile(FileProperties[0], FileProperties[1]);        }        /// <summary>        /// 解压        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void button2_Click(object sender, EventArgs e)        {            string[] FileProperties = new string[2];            FileProperties[0] = "D:\\Debug2\\a.zip";//待解压的文件            //=>Debug3目录可以不用存在            FileProperties[1] = "D:\\Debug3\\";//解压后放置的目标目录            UnZipFloClass UnZc = new UnZipFloClass();            UnZc.unZipFile(FileProperties[0], FileProperties[1]);        }