/// <summary>      /// 得到指定的輸入流的ZIP壓縮流對象【原有流對象不會改變】      /// </summary>      /// <param name="sourceStream"></param>      /// <returns></returns>      public static Stream ZipCompress(Stream sourceStream, string entryName = "zip")      {        MemoryStream compressedStream = new MemoryStream();        if (sourceStream != null)        {          long sourceOldPosition = 0;          try          {            sourceOldPosition = sourceStream.Position;            sourceStream.Position = 0;            using (ZipFile zip = new ZipFile())            {              zip.AddEntry(entryName, sourceStream);              zip.Save(compressedStream);              compressedStream.Position = 0;            }          }          catch          {          }          finally          {            try            {              sourceStream.Position = sourceOldPosition;            }            catch            {            }          }        }        return compressedStream;      }

/// <summary>      /// 得到指定的字節數組的ZIP解壓流對象      /// 當前方法僅適用于只有一個壓縮文件的壓縮包，即方法內只取壓縮包中的第一個壓縮文件      /// </summary>      /// <param name="sourceStream"></param>      /// <returns></returns>      public static Stream ZipDecompress(byte[] data)      {        Stream decompressedStream = new MemoryStream();        if (data != null)        {          try          {            MemoryStream dataStream = new MemoryStream(data);            using (ZipFile zip = ZipFile.Read(dataStream))            {              if (zip.Entries.Count > 0)              {                zip.Entries.First().Extract(decompressedStream);                // Extract方法中會操作ms，后續使用時必須先將Stream位置歸零，否則會導致后續讀取不到任何數據                // 返回該Stream對象之前進行一次位置歸零動作                decompressedStream.Position = 0;              }            }          }          catch          {          }        }        return decompressedStream;      }

/// <summary>      /// 壓縮ZIP文件      /// 支持多文件和多目錄，或是多文件和多目錄一起壓縮      /// </summary>      /// <param name="list">待壓縮的文件或目錄集合</param>      /// <param name="strZipName">壓縮后的文件名</param>      /// <param name="IsDirStruct">是否按目錄結構壓縮</param>      /// <returns>成功：true/失敗：false</returns>      public static bool CompressMulti(List<string> list, string strZipName, bool IsDirStruct)      {        try        {          using (ZipFile zip = new ZipFile(Encoding.Default))//設置編碼，解決壓縮文件時中文亂碼          {            foreach (string path in list)            {              string fileName = Path.GetFileName(path);//取目錄名稱              //如果是目錄              if (Directory.Exists(path))              {                if (IsDirStruct)//按目錄結構壓縮                {                  zip.AddDirectory(path, fileName);                }                else//目錄下的文件都壓縮到Zip的根目錄                {                  zip.AddDirectory(path);                }              }              if (File.Exists(path))//如果是文件              {                zip.AddFile(path,"imges");              }            }            zip.Save(strZipName);//壓縮            return true;          }        }        catch (Exception)        {          return false;        }      }

/// <summary>      /// 解壓ZIP文件      /// </summary>      /// <param name="strZipPath">待解壓的ZIP文件</param>      /// <param name="strUnZipPath">解壓的目錄</param>      /// <param name="overWrite">是否覆蓋</param>      /// <returns>成功：true/失敗：false</returns>      public static bool Decompression(string strZipPath, string strUnZipPath, bool overWrite)      {        try        {          ReadOptions options = new ReadOptions();          options.Encoding = Encoding.Default;//設置編碼，解決解壓文件時中文亂碼          using (ZipFile zip = ZipFile.Read(strZipPath, options))          {            foreach (ZipEntry entry in zip)            {              if (string.IsNullOrEmpty(strUnZipPath))              {                strUnZipPath = strZipPath.Split('.').First();              }              if (overWrite)              {                entry.Extract(strUnZipPath, ExtractExistingFileAction.OverwriteSilently);//解壓文件，如果已存在就覆蓋              }              else              {                entry.Extract(strUnZipPath, ExtractExistingFileAction.DoNotOverwrite);//解壓文件，如果已存在不覆蓋              }            }            return true;          }        }        catch (Exception)        {          return false;        }      }