C# 壓縮和解壓縮

話不多說，直接上代碼，最後有重要說明！！！哦對了，用的是ICSharpCode.SharpZipLib.Zip; 這個東西

壓縮：

先聲明個全局變量吧：

 //附件打包的變量
 ZipOutputStream zos = null;

下面就是壓縮的代碼了：

  #region 壓縮附件的相關
        protected void btnFile_Click(object sender, EventArgs e)
        {
            dlZipDir();
            dla.Style.Remove("display");
        }
        protected void dlZipDir()
        {
            MemoryStream ms = null;
            Response.ContentType = "application/octet-stream";
            strFileName = HttpUtility.UrlEncode(strFileName).Replace('+', ' ');
            Response.AddHeader("Content-Disposition", "attachment; filename=" + strFileName + ".zip");
            ms = new MemoryStream();
            zos = new ZipOutputStream(ms);
            //加密
            zos.Password = encrypt("1qaz@WSX");
            addZipEntry();
            zos.Finish();
            zos.Close();
            Response.Clear();
            Response.BinaryWrite(ms.ToArray());
            Response.End();
       
        }

        protected void addZipEntry()
        {
            DataTable dt = new DataTable();
            dt = getAccessory();
            string folder = Server.MapPath("Data\\Temp");
            //FileInfo[] files = new FileInfo[dt.Rows.Count];
            List<FileInfo> list = new List<FileInfo>();
            GZipResult r = new GZipResult();
            int num = 0;
            if (dt.Rows.Count > 0)
            {
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    string path = dt.Rows[i]["Fjlj"].ToString();
                    //string xh = dt.Rows[i]["Xh"].ToString();
                    string servpath = ConfigurationManager.AppSettings["Fjlj"] + path;
                    if (File.Exists(servpath))
                    {
                        FileInfo file = new FileInfo(servpath);
                        FileStream fs = File.OpenRead(file.FullName);
                        byte[] buffer = new byte[fs.Length];
                        fs.Read(buffer, 0, buffer.Length);
                        string _strFjlj = dt.Rows[i]["Fjlj"].ToString();
                        string strEntryName = _strFjlj.Substring(_strFjlj.Length - 40);
                        ZipEntry entry = new ZipEntry(strEntryName);
                        zos.PutNextEntry(entry);
                        zos.Write(buffer, 0, buffer.Length);
                        fs.Close();

                       

                    }
                }
             
            }
   

        }
        /// <summary>
        /// 獲取所有附件的DataTable1
        /// </summary>
        /// <returns></returns>
        private DataTable getAccessory()
        {
            DataTable dt = new DataTable();
            BLL.Sys_Xxfj xxfjBll = new BLL.Sys_Xxfj();
            dt = xxfjBll.getAccessory();
            return dt;
        }

還有MD5加密的方法

   #region "MD5加密"
        /// <summary>
        ///32位 MD5加密
        /// </summary>
        /// <param name="str">加密字符</param>
        /// <returns></returns>
        public static string encrypt(string str)
        {
            string cl = str;
            string pwd = "";
            MD5 md5 = MD5.Create();
            byte[] s = md5.ComputeHash(Encoding.UTF8.GetBytes(cl));
            for (int i = 0; i < s.Length; i++)
            {
                pwd = pwd + s[i].ToString("X");
            }
            return pwd;
        }
        #endregion

下面是解壓縮的“

 /// <summary>    
        /// 解壓縮文件    
        /// </summary>    
        /// <param name="GzipFile">壓縮包文件名</param>    
        /// <param name="targetPath">解壓縮目標路徑</param>           
        public static void Decompress(string GzipFile, string targetPath)
        {
            //string directoryName = Path.GetDirectoryName(targetPath + "//") + "//";    
            string directoryName = targetPath;
            if (!Directory.Exists(directoryName))
            {
                Directory.CreateDirectory(directoryName);//生成解壓目錄    
            }
            string CurrentDirectory = directoryName;
            byte[] data = new byte[2048];
            int size = 2048;
            ZipEntry theEntry = null;
            using (ZipInputStream s = new ZipInputStream(File.OpenRead(GzipFile)))
            {
                //解密
                s.Password = encrypt("1qaz@WSX");
                while ((theEntry = s.GetNextEntry()) != null)
                {
                    if (theEntry.IsDirectory)
                    {// 該結點是目錄    
                        if (!Directory.Exists(CurrentDirectory + theEntry.Name)) Directory.CreateDirectory(CurrentDirectory + theEntry.Name);
                    }
                    else
                    {
                        if (theEntry.Name != String.Empty)
                        {
                            //  檢查多級目錄是否存在  
                            if (theEntry.Name.Contains("//"))
                            {
                                string parentDirPath = theEntry.Name.Remove(theEntry.Name.LastIndexOf("//") + 1);
                                if (!Directory.Exists(parentDirPath))
                                {
                                    Directory.CreateDirectory(CurrentDirectory + parentDirPath);
                                }
                            }

                            //解壓文件到指定的目錄    
                            using (FileStream streamWriter = File.Create(CurrentDirectory + "\\" + theEntry.Name))
                            {
                                while (true)
                                {
                                    size = s.Read(data, 0, data.Length);
                                    if (size <= 0) break;
                                    streamWriter.Write(data, 0, size);
                                }
                                streamWriter.Close();
                            }
                        }
                    }
                }
                s.Close();
            }
        }

最後的說明就是：這個壓縮方法是將文件流到內存中，如果文件過大 有可能造成程序崩掉，反正我是崩掉了。。。