请教winform开发中有没有服务器文件边生成边下载的

if (filelist != null)
                {
                    foreach (var file in filelist)
                    {
                        string strFileName = file;                        long page = BLL.Files.GetFilePageCount(Serial, GUID, strFileName);                        string destFileName = string.Format(@"" + FolderPathName + "" + strFileName + "");
                        if (System.IO.File.Exists(destFileName))
                        {
                            System.IO.File.Delete(destFileName);
                        }
                        using (FileStream fs = File.Open(destFileName, FileMode.OpenOrCreate, FileAccess.Write))
                        {
                            for (int i = 0; i < page; i++)
                            {
                                byte[] buffer = new byte[1024 * 64];
                                buffer = BLL.Files.GetData(Serial, GUID, strFileName, i);
                                fs.Write(buffer, 0, buffer.Length);                                int Percent = i / int.Parse(page.ToString()) * 100;                            }
                            fs.Flush();
                            fs.Close();
                        }
                    }
抓取数据流生成文件。 string fileName = "a.zip";//客户端保存的文件名
            //string filePath = Server.MapPath("DownLoad/one.txt");//路径
            System.IO.FileInfo fileinfo = new System.IO.FileInfo(filepath);
            if (fileinfo.Exists == true)
            {
                const long ChunkSize = 102400;//100k每次读取文件，只读取100k，这样可以缓解服务器的压力
                byte[] buffer = new byte[ChunkSize];
                Response.Clear();
                System.IO.FileStream iStream = System.IO.File.OpenRead(filepath);
                long dataLengthToRead = iStream.Length;//获取下载的文件总大小
                Response.ContentType = "application/octet-stream";
                Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(fileName));
                while (dataLengthToRead > 0 && Response.IsClientConnected)
                {
                    int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//读取的大小
                    Response.OutputStream.Write(buffer, 0, lengthRead);
                    Response.Flush();
                    dataLengthToRead = dataLengthToRead - lengthRead;
                }
                Response.Close();
            }文件下载代码。中间还有一个生成压缩包的代码，感觉用处不大，就不贴了。