在 Google 云端硬盘上的恢复式上传中出现问题

Question

我正在尝试在Google驱动器上上传大文件，执行可恢复上传。

这是代码流

第 1 步：使用云端硬盘服务在 Google 云端硬盘上创建文件并启动可恢复上传会话 使用放置请求

    String fileID = _DriveService.Files.Insert(googleFileBody).Execute().Id;
    //Initiating resumable upload session
    String UploadUrl = null;
    String _putUrl = "https://www.googleapis.com/upload/drive/v2/files/" + fileID  + "?uploadType=resumable";  
    HttpWebRequest httpRequest =  (HttpWebRequest)WebRequest.Create(_putUrl);    
    httpRequest.Headers["Authorization"] = "Bearer " + AccessToken;
    httpRequest.Method = "PUT";
    requestStream = httpRequest.GetRequestStream();
    _webResponse = (HttpWebResponse)httpRequest.GetResponse();
    if (_webResponse.StatusCode == HttpStatusCode.OK)
     {
         //Getting response OK
           UploadUrl = _webResponse.Headers["Location"].ToString();          
     }

第 2 步：使用 UploadUrl 上传区块。字节数组是 256kb 的倍数，并且对每个块的调用都在循环中

    private void AppendFileData(byte[] chunk)
    {
      try
        {
          HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(UploadUrl);
          httpRequest.ContentLength = chunk.Length;
          httpRequest.Headers["Content-Range"] = "bytes " + startOffset + "-" + endOffset+ "/" + sourceFileSize;
          httpRequest.ContentType= MimeType;
          httpRequest.Method = "PUT";
         MemoryStream stream =new MemoryStream(chunk);
          using (System.IO.Stream requestStream = httpRequest.GetRequestStream())
                    {
                        stream.CopyTo(requestStream);
                        requestStream.Flush();
                        requestStream.Close();
                    }
          HttpWebResponse httpResponse = (HttpWebResponse)(httpRequest.GetResponse()); // Throws exception as 
          //System.Net.WebException: The remote server returned an error: (308) Resume Incomplete.
         //at System.Net.HttpWebRequest.GetResponse()
         // There is no data getting appended to file
        // Still executing the append for remaining chunks
        }
      catch(System.Net.WebException ex)
        {
        }
    }

对于我最后一个不是 256KB 倍数的块，我收到错误

System.Net.WebException： 远程服务器返回错误： (400( 错误请求。 at System.Net.HttpWebRequest.GetResponse((

我在这段代码中做错了什么？请指教。提前致谢

马尤雷什。

Answer 1

尝试检查最后一个块是否传递了正确的大小，而不是本论坛中所述的整个数组。Ali在该论坛上表示，"一个潜在的问题是：如果你发送的字节数组在最后一个请求中是半空的(即缓冲区的读取小于块大小(。下面是可恢复上传的示例实现。希望这有帮助。