SharpZipLib 压缩ZIP导出

    　　　　  var uploadSectionDir = Path.Combine("Upload", "QQ", DateTime.Now.ToString("yyyyMMdd"));
             string uploadDir = Path.Combine(HttpRuntime.AppDomainAppPath, uploadSectionDir);
             if (!Directory.Exists(uploadDir))
             {
                 Directory.CreateDirectory(uploadDir);
             }
             string fileName ="test.zip";
             string filePath = Path.Combine(uploadDir, fileName);

             //生成的压缩文件为test.zip
             using (FileStream fsOut = System.IO.File.Create(filePath))
             {
                 //ZipOutputStream类的构造函数需要一个流，文件流、内存流都可以，压缩后的内容会写入到这个流中。
                 using (ZipOutputStream zipStream = new ZipOutputStream(fsOut))
                 {
                     MemoryStream ws = new AirBillBLL().ExportToExcel(ladingNoList);
                     string entryName = string.Concat(string.Format("{0:yyyyMMddHHmmssffff}", DateTime.Now), ".xls");
                     ZipEntry newEntry = new ZipEntry(entryName);
                     newEntry.DateTime = DateTime.Now;
                     newEntry.Size = ws.Length;

                     //把压缩项的信息添加到ZipOutputStream中。
                     zipStream.PutNextEntry(newEntry);
                     byte[] buffer = new byte[];
                     //把需要压缩文件以文件流的方式复制到ZipOutputStream中。

                     StreamUtils.Copy(ws, zipStream, buffer);

                     zipStream.CloseEntry();
                     zipStream.IsStreamOwner = false;
                     zipStream.Finish();
                     zipStream.Close();
                 }
             }
35             return File(filePath, "application/x-zip-compressed", string.Concat(string.Format("{0:yyyyMMddHHmmssffff}", DateTime.Now), ".zip"));