.net从服务端下载文件（可以断点续传）

public void DownFile(string guid)
        {
            var fileTransfer = new FileTransfer();
            var directoryPath = Path.Combine(InitInfo.Config_GarbagePath, "FileImport", guid);
            fileTransfer.ChunkTransfer(System.Web.HttpContext.Current, GetDownFilePath(directoryPath));
            HttpContext.Response.Flush();

            //删除临时文件
            //   Utility.DeleteDirectory(directoryPath);
        }
public void DownFile(string guid)