【转】【C#】ZIP、RAR 压缩与解压缩-程序员宅基地

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 = 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;
        }
    }   
}

调用：

/// <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]);
        }

 ICSharpCode.SharpZipLib.dll下载 

原文地址：http://www.cnblogs.com/zfanlong1314/p/4202695.html

PS.补充RAR解压 2018-8-18
SharpCompress的C#框架被开源，您可以在搜索引擎中找到SharpCompress框架的开源代码，它支持：rar 7zip, zip, tar, tzip和bzip2格式的压缩和解压，下面的示例直接从rar格式文件读取并解压文件。

using (Stream stream = File.OpenRead(@"C:\Code\sharpcompress.rar"))
            {
                var reader = ReaderFactory.Open(stream);
                while (reader.MoveToNextEntry())
                {
                    if (!reader.Entry.IsDirectory)
                    {
                        reader.WriteEntryToDirectory(@"C:\temp");
                    }
                }
            }