C#/.Net文件打包下载

 Dictionary<string, Stream> streams = new Dictionary<string, Stream> ();
 Stream streamWriter = null;

//将所有文件流在循环中加进，根据自己情况来写

　　　　streamWriter = File.Open(filePath, FileMode.Open);
　　　　streams.Add(strName, streamWriter);

 //下面可以直接复制粘贴
  MemoryStream ms = new MemoryStream();
  ms = PackageManyZip(streams);
  byte[] bytes = new byte[(int)ms.Length];
  ms.Read(bytes, 0, bytes.Length);
  ms.Close();
  Response.ContentType = "application/octet-stream";
  //通知浏览器下载文件而不是打开
  Response.AddHeader("Content-Disposition", "attachment;  filename=" + HttpUtility.UrlEncode("打包文档.zip", System.Text.Encoding.UTF8));
  Response.BinaryWrite(bytes);
  Response.Flush();

 /// <summary>
     /// 将多个流进行zip压缩，返回压缩后的流
     /// </summary>
     /// <param name="streams">key：文件名；value：文件名对应的要压缩的流</param>
     /// <returns>压缩后的流</returns>
    static MemoryStream PackageManyZip(Dictionary<string, Stream> streams)
    {
        byte[] buffer = new byte[6500];
        MemoryStream returnStream = new MemoryStream();
        var zipMs = new MemoryStream();
        using (ZipOutputStream zipStream = new ZipOutputStream(zipMs))
        {
            zipStream.SetLevel(9);
            foreach (var kv in streams)
            {
                string fileName = kv.Key;
                using (var streamInput = kv.Value)
                {
                    zipStream.PutNextEntry(new ZipEntry(fileName));
                    while (true)
                    {
                        var readCount = streamInput.Read(buffer, 0, buffer.Length);
                        if (readCount > 0)
                        {
                            zipStream.Write(buffer, 0, readCount);
                        }
                        else
                        {
                            break;
                        }
                    }
                    zipStream.Flush();
                }
            }
            zipStream.Finish();
            zipMs.Position = 0;
            zipMs.CopyTo(returnStream, 5600);
        }
        returnStream.Position = 0;
        return returnStream;
    }