SharpZipLib 压缩文档下载

using ICSharpCode.SharpZipLib.Zip;

  Response.Clear();

  Response.ClearContent();

  Response.ClearHeaders();

//创建压缩输出流

  ZipOutputStream zos = null;

//创建内存流

  MemoryStream ms = null;

  Response.ContentType = "application/octet-stream";   Response.AddHeader("Content-Disposition", "attachment; filename=" + fileName + ".zip");

  ms = new MemoryStream();

//关联压缩流和内存流

  zos = new ZipOutputStream(ms);

    string strEntryName = fileName + ".pdf";

//创建压缩的对象实体放入压缩流，可循环创建

 foreach (string file in filenames)

   　 {

        ZipEntry entry = new ZipEntry(Path.GetFileName(file));

       entry.DateTime = DateTime.Now;

        zos.PutNextEntry(entry);

       using (FileStream fs = File.OpenRead(file))

       {

          int sourceBytes;

           do

              {

                sourceBytes = fs.Read(buffer, 0, buffer.Length);

                zos.Write(buffer, 0, sourceBytes);

              } while (sourceBytes > 0);

         }

     }

   zos.Finish();

   zos.Close();

   Response.BinaryWrite(ms.ToArray());

   Response.End();