zip类
public class ZipClass
    {
        /**//// <summary>
        /// 压缩方法
        /// </summary>
        /// <param name="strPath">要压缩文件夹</param>
        /// <param name="strFileName">生成的文件名</param>
        /// <param name="PassWord">密码</param>
        /// <returns>1 成功 -1输入的压缩文件夹为空 -2 输入的压缩文件夹目录不存在！</returns>
        public static int Zip(string strPath, string strFileName, string PassWord)
        {
            if (!String.IsNullOrEmpty(strPath))
            {
                //throw new Exception("输入的压缩文件夹为空");
                return -1;
            }
            if (!Directory.Exists(strPath))
            {
                //throw new Exception("输入的压缩文件夹目录不存在！");
                return -2;
            }
            if (!File.Exists(strFileName))
            {
                File.Create(strFileName);
            }
            ZipOutputStream zip = new ZipOutputStream(File.Create(strFileName));
            if (!string.IsNullOrEmpty(PassWord))
                zip.Password = PassWord;
            IList<FileInfo> list = new List<FileInfo>();
            GetFileList(strPath, list);
            try
            {
                byte[] buffer = new byte[2048];
                int count = 0;
                foreach (FileInfo fi in list)
                {
                    count = 0;
                    using (FileStream fs = File.OpenRead(fi.FullName))
                    {
                        ZipEntry entry = new ZipEntry(fi.FullName.Substring(strPath.Length + 1));
                        entry.DateTime = fi.LastWriteTime;
                        entry.Size = fs.Length;
                        zip.PutNextEntry(entry);
                        while ((count = fs.Read(buffer, 0, 2048)) > 0)
                        {
                            zip.Write(buffer, 0, count);
                        }
                    }
                }
            }
            catch
            {
                throw;
            }
            finally
            {
                zip.Finish();
                zip.Close();
            }
            return 1;
        }
        private static void GetFileList(string strPath, IList<FileInfo> list)
        {
            DirectoryInfo di = new DirectoryInfo(strPath);
            foreach (DirectoryInfo di1 in di.GetDirectories())
            {
                GetFileList(di1.FullName, list);
            }
            foreach (FileInfo fi in di.GetFiles())
            {
                list.Add(fi);
            }
        }
        /**//// <summary>
        /// 解压缩文件
        /// </summary>
        /// <param name="strFileName">压缩文件</param>
        /// <param name="strPath">目标目录</param>
        /// <param name="PassWord">密码</param>
        /// <returns>1 成功 -1输入的压缩文件夹为空 -2 输入的解压缩文件夹目录不存在！-3 文件不存在</returns>
        public static int UnZip(string strFileName, string strPath, string PassWord)
        {
            if (!String.IsNullOrEmpty(strPath))
            {
                //throw new Exception("输入的压缩文件夹为空");
                return -1;
            }
            if (!Directory.Exists(strPath))
            {
                //throw new Exception("输入的压缩文件夹目录不存在！");
                return -2;
            }
            if (!File.Exists(strFileName))
            {
                //throw new Exception("文件：" + strFileName + "不存在!");
                return -3;
            }
            ZipEntry entry;
            ZipInputStream zis = null;
            try
            {
                zis = new ZipInputStream(File.Open(strFileName, FileMode.Open));
                if (!string.IsNullOrEmpty(PassWord))
                    zis.Password = PassWord;
                byte[] buffer = new byte[2048];
                int count = 0;
                while ((entry = zis.GetNextEntry()) != null)
                {
                    CreateDirList(entry.Name, strPath);
                    string strPath1 = strPath + "\\" + entry.Name;
                    using (FileStream streamWriter = File.Create(strPath1))
                    {
                        while ((count = zis.Read(buffer, 0, 2048)) > 0)
                        {
                            streamWriter.Write(buffer, 0, count);
                        }
                    }
                    File.SetLastWriteTime(strPath1, entry.DateTime);
                }
            }
            catch
            {
                throw;
            }
            finally
            {
                if (zis != null)
                    zis.Close();
            }
            return 1;
        }
        private static void CreateDirList(string filename, string basePath)
        {
            string dirName = basePath;
            string[] dirlevelname = filename.Split('\\');
            for (int i = 0; i < dirlevelname.Length - 1; i++)
            {
                dirName += "\\" + dirlevelname[i];
                if (Directory.Exists(dirName))
                {
                    continue;
                }
                Directory.CreateDirectory(dirName);
            }
        }
    }