將數個檔案依指定名稱zip後,response回page讓client下載

    protected void BtnSave_Click(object sender, EventArgs e)
    {
      MemoryStream ms = FEDIClientFacade.FEDISetupToExcel(this, DropDownList1.SelectedValue);
      string txtFEDIName = "金融EDI交易量統計表" + (DateTime.Now.Year - 1911).ToString("000") + DateTime.Now.Month.ToString("00") + ".xls";

      MemoryStream msCust = FEDIClientFacade.FEDISetupCustomerToExcel(this, DropDownList1.SelectedValue);
      string txtFEDINameCust = "金融EDI客戶統計表" + (DateTime.Now.Year - 1911).ToString("000") + DateTime.Now.Month.ToString("00") + ".xls";

      bool isSuccess = Utility.DoStreamZipPopUpDownload(this, new Stream[2] { ms, msCust }, 
                            new string[] { txtFEDIName, txtFEDINameCust }, "金融EDI統計表.zip");
      if (!isSuccess)
        ClientScript.RegisterStartupScript(this.GetType(), "NG", "<script>alert('報表產生失敗!')</script>");       
    }

//-----------------------------------------------------------------------------//

    /// 

    /// 將Stream依指定路徑與檔名存檔
    /// 
    /// Stream
    /// 檔案完整路徑與檔名
    public static void SaveStreamToFile(Stream stream, string filePathName)
    {
      string nPath = filePathName.Substring(0, filePathName.IndexOf(filePathName.Split('\\')[filePathName.Split('\\').Length - 1]));
      if (!Directory.Exists(nPath))
        Directory.CreateDirectory(nPath);
      System.IO.File.WriteAllBytes(filePathName, StreamToByteArray(stream));
    }

    /// 

    /// 將Stream轉為Byte[]
    /// 
    /// Stream
    /// Byte[]
    public static byte[] StreamToByteArray(Stream stream)
    {
      long FileSize = stream.Length;
      byte[] Buffer = new byte[FileSize];
      stream.Read(Buffer, 0, (int)FileSize);
      stream.Close();
      return Buffer;
    } 


    /// 

    /// 將數個檔案依指定名稱zip後,response回page讓client下載
    /// 
    /// popup之page
    /// 各檔案完整路徑+名稱
    /// zip檔案之名稱
    /// 
    public static bool DoZipPopUpDownload(System.Web.UI.Page page, string[] files, string zipname)
    {
      try
      {
        //建立暫存資料夾
        string zipTempPath = "~/zipTemp/" + new Random().Next().ToString() + "/";
        string zipTempPathOrg = zipTempPath + "org/";
        if (!Directory.Exists(page.Server.MapPath(zipTempPathOrg)))
          Directory.CreateDirectory(page.Server.MapPath(zipTempPathOrg));

        //將檔案複製至暫存資料夾
        foreach (string file in files)
        {
          string filename = file.Split('\\')[file.Split('\\').Length - 1];
          //string filename = file.Substring(0, file.IndexOf(file.Split('\\')[file.Split('\\').Length - 1]));
          File.Copy(file, page.Server.MapPath(zipTempPathOrg + filename));
        }

        //建立zip壓縮檔
        ICSharpCode.SharpZipLib.Zip.FastZip fz = new ICSharpCode.SharpZipLib.Zip.FastZip();
        fz.CreateZip(page.Server.MapPath(zipTempPath + zipname), page.Server.MapPath(zipTempPathOrg), true, "");

        //Response下載zip檔
        byte[] zip = File.ReadAllBytes(page.Server.MapPath(zipTempPath + zipname));
       page.Response.AddHeader("content-disposition", string.Format("attachment; filename={0}", page.Server.UrlPathEncode(zipname)));
        page.Response.BinaryWrite(zip);

        //清空檔案與暫存檔
        Directory.Delete(page.Server.MapPath(zipTempPath), true);
        return true;
      }
      catch
      {
        return false;
      }
    }


    /// 

    /// 將數個資料Stream依指定名稱zip後,response回page讓client下載
    /// 
    /// popup之page
    /// 各檔案資料Stream
    /// 對應各檔案Stream之檔案名稱
    /// zip檔案之名稱
    /// 
    public static bool DoStreamZipPopUpDownload(System.Web.UI.Page page, Stream[] streams,string[] filenames, string zipname)
    {
      try
      {
        //建立暫存資料夾
        string zipTempPath = "~/zipTemp/" + new Random().Next().ToString() + "/";
        if (!Directory.Exists(page.Server.MapPath(zipTempPath)))
          Directory.CreateDirectory(page.Server.MapPath(zipTempPath));

        if (streams.Length == filenames.Length)
        {
          string[] files = new string[streams.Length];
          //資料寫入暫存
          for (int i = 0; i < streams.Length; i++)
          {
            SaveStreamToFile(streams[i], page.Server.MapPath(zipTempPath + filenames[i]));
            files[i] = page.Server.MapPath(zipTempPath + filenames[i]);
          }

          //製作popup zip download
          bool isSuccess = DoZipPopUpDownload(page, files, zipname);

          //清空暫存
          Directory.Delete(zipTempPath, true);
          return isSuccess;
        }
        else
        {
          return false;
        }

      }
      catch 
      {
        return false;
      }
    }