程序集需要添加的引用是：ICSharpCode.SharpZipLib.dll

使用实例：

            //执行压缩            ClsZip.Zip(downZipPath, sourceTopPath, 1, "", allFilePath);//执行下载            ctrlDcAllGrxx.download(downZipPath, true);

压缩文件的类ClsZip：

   public class ClsZip

    {/// <summary>/// 生成压缩文件/// </summary>/// <param name="strZipPath">生成的zip文件的路径,包括文件名</param>/// <param name="strSourceTopDirectoryPath">要压缩的源文件的上级目录</param>/// <param name="intZipLevel">T压缩等级</param>/// <param name="strPassword">压缩包解压密码,不设密码""</param>/// <param name="filesOrDirectoriesPaths">源文件路径</param>/// <returns></returns>        public static bool Zip(string strZipPath, string strSourceTopDirectoryPath, int intZipLevel, string strPassword, 

List<string> filesOrDirectoriesPaths)        {try            {                List<string> AllFilesPath = new List<string>();if (filesOrDirectoriesPaths.Count > 0) // get all files path                {for (int i = 0; i < filesOrDirectoriesPaths.Count; i++)                    {if (File.Exists(filesOrDirectoriesPaths[i]))                        {                            AllFilesPath.Add(filesOrDirectoriesPaths[i]);                        }else if (Directory.Exists(filesOrDirectoriesPaths[i]))                        {                            GetDirectoryFiles(filesOrDirectoriesPaths[i], AllFilesPath);                        }                    }                }if (AllFilesPath.Count > 0)                {                    ZipOutputStream zipOutputStream = new ZipOutputStream(File.Create(strZipPath));                    zipOutputStream.SetLevel(intZipLevel);                    zipOutputStream.Password = strPassword;for (int i = 0; i < AllFilesPath.Count; i++)                    {string strFile = AllFilesPath[i].ToString();try                        {if (strFile.Substring(strFile.Length - 1) == "") //folder                            {string strFileName = strFile.Replace(strSourceTopDirectoryPath, "");if (strFileName.StartsWith(""))                                {                                    strFileName = strFileName.Substring(1);                                }                                ZipEntry entry = new ZipEntry(strFileName);                                entry.DateTime = DateTime.Now;                                zipOutputStream.PutNextEntry(entry);                            }else //file                            {                                FileStream fs = File.OpenRead(strFile);byte[] buffer = new byte[fs.Length];                                fs.Read(buffer, 0, buffer.Length);string strFileName = strFile.Replace(strSourceTopDirectoryPath, "");if (strFileName.StartsWith(""))                                {                                    strFileName = strFileName.Substring(0);                                }                                ZipEntry entry = new ZipEntry(strFileName);                                entry.DateTime = DateTime.Now;                                zipOutputStream.PutNextEntry(entry);                                zipOutputStream.Write(buffer, 0, buffer.Length);                                fs.Close();                                fs.Dispose();                            }                        }catch                        {continue;                        }                    }                    zipOutputStream.Finish();                    zipOutputStream.Close();return true;                }else                {return false;                }            }catch            {return false;            }        }/// <summary>/// Gets the directory files./// </summary>/// <param name="strParentDirectoryPath">源文件路径</param>/// <param name="AllFilesPath">所有文件路径</param>        public static void GetDirectoryFiles(string strParentDirectoryPath, List<string> AllFilesPath)        {string[] files = Directory.GetFiles(strParentDirectoryPath);for (int i = 0; i < files.Length; i++)            {                AllFilesPath.Add(files[i]);            }string[] directorys = Directory.GetDirectories(strParentDirectoryPath);for (int i = 0; i < directorys.Length; i++)            {                GetDirectoryFiles(directorys[i], AllFilesPath);            }if (files.Length == 0 && directorys.Length == 0) //empty folder            {                AllFilesPath.Add(strParentDirectoryPath);            }        }

    }

参考：

 ZipOutputStream类（1）

如果要完成一个文件或文件夹的压缩，则要使用ZipOutputStream类。ZipOutputStream是OutputStream的子类，常用操作方法如表所示。

ZipOutputStream类的常用方法