C# 利用ICSharpCode.SharpZipLib 压缩和解压文件

public class SharpZipHelper
    {
       /// <summary>
        /// 压缩率：0-9
       /// </summary> 
        private int compressionLevel = 5;
        private byte[] buffer = new byte[2048];
         
        /// <summary>
        /// 压缩文件
        /// </summary>
        /// <param name="fileToZip">要压缩的文件路径</param>
        /// <param name="zipedFile">压缩后的文件路径</param>
        public void ZipFile(string fileToZip, string zipedFile)
        {
            if (!File.Exists(fileToZip))
            {
                throw new FileNotFoundException("The specified file " + fileToZip + " could not be found.");
            }

            using (ZipOutputStream zipStream = new ZipOutputStream(File.Create(zipedFile)))
            {
                string fileName = Path.GetFileName(fileToZip);
                ZipEntry zipEntry = new ZipEntry(fileName);
                zipStream.PutNextEntry(zipEntry);
                zipStream.SetLevel(compressionLevel);

                using (FileStream streamToZip = new FileStream(fileToZip, FileMode.Open, FileAccess.Read))
                { 
                    while (true)
                    {
                        int size = streamToZip.Read(buffer, 0, buffer.Length);
                        if (size < 1)
                            break;
                        zipStream.Write(buffer, 0, size);
                    }
                }
            }
        }

        /// <summary>
        /// 压缩文件夹
        /// </summary>
        /// <param name="directoryToZip">要压缩的文件夹路径</param>
        /// <param name="zipedDirectory">压缩或的文件夹路径</param>
        public void ZipDerctory(string directoryToZip, string zipedFileName)
        {
            using (ZipOutputStream zipStream = new ZipOutputStream(File.Create(zipedFileName)))
            {
                ArrayList fileList = GetFileList(directoryToZip);
                int directoryNameLength = (Directory.GetParent(directoryToZip)).ToString().Length;

                zipStream.SetLevel(compressionLevel);
                ZipEntry zipEntry = null;
                FileStream fileStream = null;

                foreach (string fileName in fileList)
                {
                    zipEntry = new ZipEntry(fileName.Remove(0, directoryNameLength));
                    zipStream.PutNextEntry(zipEntry); 
                    if (!fileName.EndsWith(@"/"))
                    {
                        fileStream = File.OpenRead(fileName);
                       
                        while (true)
                        {
                            int readCount = fileStream.Read(buffer, 0, buffer.Length);
                            if (readCount < 1)
                                break;
                            zipStream.Write(buffer, 0, readCount); 
                        }
                    }
                }
            }
        }
           
        /// <summary>
        /// 得到文件下的所有文件
        /// </summary>
        /// <param name="directory">文件夹路径</param>
        /// <returns></returns>
        private ArrayList GetFileList(string directory)
        {
            ArrayList fileList = new ArrayList();
            bool isEmpty = true;
            foreach (string file in Directory.GetFiles(directory))
            {
                fileList.Add(file);
                isEmpty = false;
            }
            if (isEmpty)
            {
                if (Directory.GetDirectories(directory).Length == 0)
                {
                    fileList.Add(directory + @"/");
                }
            }
            foreach (string dirs in Directory.GetDirectories(directory))
            {
                foreach (object obj in GetFileList(dirs))
                {
                    fileList.Add(obj);
                }
            }
            return fileList;
        }
         
        /// <summary>
        /// 解压缩文件
        /// </summary>
        /// <param name="zipFilePath">压缩文件路径和文件名 eg:D:\aa.zip</param>
        /// <param name="unZipFilePatah">解压缩文件存放路径 eg:D:\aa\</param>
        public void UnZipFile(string zipFilePath, string unZipFilePatah)
        {
            //如果目录不存在则创建
            if (!Directory.Exists(unZipFilePatah))
                Directory.CreateDirectory(unZipFilePatah);
            using (ZipInputStream zipStream = new ZipInputStream(File.OpenRead(zipFilePath)))
            {
                ZipEntry zipEntry = null;
                while ((zipEntry=zipStream.GetNextEntry()) != null)
                {
                    string fileName = Path.GetFileName(zipEntry.Name);
                    if (!string.IsNullOrEmpty(fileName))
                    {
                        if (zipEntry.CompressedSize == 0)
                            break;
                        using (FileStream stream = File.Create(unZipFilePatah + fileName))
                        {
                            while (true)
                            {
                                int size = zipStream.Read(buffer, 0, buffer.Length);
                                if (size > 0)
                                {
                                    stream.Write(buffer, 0, size);
                                }
                                else
                                {
                                    break;
                                }
                            }
                        }
                    }
                }
            }
        }

        /// <summary>
        /// 解压缩目录
        /// </summary>
        /// <param name="zipDirectoryPath">压缩目录路径 eg:D:\aaa.zip</param>
        /// <param name="unZipDirecotyPath">解压缩目录路径 eg:D:\aaaa\</param>
        public void UnZipDirectory(string zipDirectoryPath, string unZipDirecotyPath)
        {
            //如果目录不存在则创建
            if (!Directory.Exists(unZipDirecotyPath))
                Directory.CreateDirectory(unZipDirecotyPath);
            using (ZipInputStream zipStream = new ZipInputStream(File.OpenRead(zipDirectoryPath)))
            {
                ZipEntry zipEntry = null;
                while ((zipEntry = zipStream.GetNextEntry())!= null)
                {
                    string directoryName = Path.GetDirectoryName(zipEntry.Name);
                    string fileName = Path.GetFileName(zipEntry.Name);
                    directoryName = unZipDirecotyPath + directoryName;
                    if (!string.IsNullOrEmpty(directoryName))
                    {
                        Directory.CreateDirectory(directoryName);
                    } 
                    if (!string.IsNullOrEmpty(fileName))
                    {
                        if (zipEntry.CompressedSize == 0)
                            break;
                        if (zipEntry.IsDirectory)
                        {
                            directoryName = Path.GetDirectoryName(unZipDirecotyPath + zipEntry.Name);
                            Directory.CreateDirectory(directoryName);
                        }

                        using (FileStream stream = File.Create(unZipDirecotyPath + zipEntry.Name))
                        {
                            while (true)
                            {
                                int size = zipStream.Read(buffer, 0, buffer.Length);
                                if (size > 0)
                                {
                                    stream.Write(buffer, 0, size);
                                }
                                else
                                {
                                    break;
                                }
                            }
                        }
                    }
                }
            }
        }
    } 

 转载来源：http://blog.csdn.net/venus0314/article/details/1280610