/// <summary>
/// 压缩和解压文件
/// </summary>
public class ZipClass
{/// <summary>/// 所有文件缓存/// </summary>List<string> files = new List<string>();/// <summary>/// 所有空目录缓存/// </summary>List<string> paths = new List<string>();/// <summary>/// 压缩单个文件/// </summary>/// <param name="fileToZip">要压缩的文件</param>/// <param name="zipedFile">压缩后的文件全名</param>/// <param name="compressionLevel">压缩程度，范围0-9，数值越大，压缩程序越高</param>/// <param name="blockSize">分块大小</param>public void ZipFile(string fileToZip, string zipedFile, int compressionLevel, int blockSize){if (!System.IO.File.Exists(fileToZip))//如果文件没有找到，则报错
        {throw new FileNotFoundException("The specified file " + fileToZip + " could not be found. Zipping aborderd");}FileStream streamToZip = new FileStream(fileToZip, FileMode.Open, FileAccess.Read);FileStream zipFile = File.Create(zipedFile);ZipOutputStream zipStream = new ZipOutputStream(zipFile);ZipEntry zipEntry = new ZipEntry(fileToZip);zipStream.PutNextEntry(zipEntry);zipStream.SetLevel(compressionLevel);byte[] buffer = new byte[blockSize];int 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 (Exception ex){GC.Collect();throw ex;}zipStream.Finish();zipStream.Close();streamToZip.Close();GC.Collect();}/// <summary>/// 压缩目录（包括子目录及所有文件）/// </summary>/// <param name="rootPath">要压缩的根目录</param>/// <param name="destinationPath">保存路径</param>/// <param name="compressLevel">压缩程度，范围0-9，数值越大，压缩程序越高</param>public void ZipFileFromDirectory(string rootPath, string destinationPath, int compressLevel){GetAllDirectories(rootPath);/* while (rootPath.LastIndexOf("\\") + 1 == rootPath.Length)//检查路径是否以"\"结尾{rootPath = rootPath.Substring(0, rootPath.Length - 1);//如果是则去掉末尾的"\"}*///string rootMark = rootPath.Substring(0, rootPath.LastIndexOf("\\") + 1);//得到当前路径的位置，以备压缩时将所压缩内容转变成相对路径。string rootMark = rootPath + "\\";//得到当前路径的位置，以备压缩时将所压缩内容转变成相对路径。Crc32 crc = new Crc32();ZipOutputStream outPutStream = new ZipOutputStream(File.Create(destinationPath));outPutStream.SetLevel(compressLevel); // 0 - store only to 9 - means best compressionforeach (string file in files){FileStream fileStream = File.OpenRead(file);//打开压缩文件byte[] buffer = new byte[fileStream.Length];fileStream.Read(buffer, 0, buffer.Length);ZipEntry entry = new ZipEntry(file.Replace(rootMark, string.Empty));entry.DateTime = DateTime.Now;// set Size and the crc, because the information// about the size and crc should be stored in the header// if it is not set it is automatically written in the footer.// (in this case size == crc == -1 in the header)// Some ZIP programs have problems with zip files that don't store// the size and crc in the header.entry.Size = fileStream.Length;fileStream.Close();crc.Reset();crc.Update(buffer);entry.Crc = crc.Value;outPutStream.PutNextEntry(entry);outPutStream.Write(buffer, 0, buffer.Length);}this.files.Clear();foreach (string emptyPath in paths){ZipEntry entry = new ZipEntry(emptyPath.Replace(rootMark, string.Empty) + "/");outPutStream.PutNextEntry(entry);}this.paths.Clear();outPutStream.Finish();outPutStream.Close();GC.Collect();}/// <summary>/// 取得目录下所有文件及文件夹，分别存入files及paths/// </summary>/// <param name="rootPath">根目录</param>private void GetAllDirectories(string rootPath){string[] subPaths = Directory.GetDirectories(rootPath);//得到所有子目录foreach (string path in subPaths){GetAllDirectories(path);//对每一个字目录做与根目录相同的操作：即找到子目录并将当前目录的文件名存入List
        }string[] files = Directory.GetFiles(rootPath);foreach (string file in files){this.files.Add(file);//将当前目录中的所有文件全名存入文件List
        }if (subPaths.Length == files.Length && files.Length == 0)//如果是空目录
        {this.paths.Add(rootPath);//记录空目录
        }}/// <summary>/// 解压缩文件(压缩文件中含有子目录)/// </summary>/// <param name="zipfilepath">待解压缩的文件路径</param>/// <param name="unzippath">解压缩到指定目录</param>/// <returns>解压后的文件列表</returns>public List<string> UnZip(string zipfilepath, string unzippath){//解压出来的文件列表List<string> unzipFiles = new List<string>();//检查输出目录是否以“\\”结尾if (unzippath.EndsWith("\\") == false || unzippath.EndsWith(":\\") == false){unzippath += "\\";}ZipInputStream s = new ZipInputStream(File.OpenRead(zipfilepath));ZipEntry theEntry;while ((theEntry = s.GetNextEntry()) != null){string directoryName = Path.GetDirectoryName(unzippath);string fileName = Path.GetFileName(theEntry.Name);//生成解压目录【用户解压到硬盘根目录时，不需要创建】if (!string.IsNullOrEmpty(directoryName)){Directory.CreateDirectory(directoryName);}if (fileName != String.Empty){//如果文件的压缩后大小为0那么说明这个文件是空的,因此不需要进行读出写入if (theEntry.CompressedSize == 0)break;//解压文件到指定的目录directoryName = Path.GetDirectoryName(unzippath + theEntry.Name);//建立下面的目录和子目录
                Directory.CreateDirectory(directoryName);//记录导出的文件unzipFiles.Add(unzippath + theEntry.Name);FileStream streamWriter = File.Create(unzippath + theEntry.Name);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();GC.Collect();return unzipFiles;}
}