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地鐵應用程序的後臺傳輸（上載器）進度給了我一秒內100％以上的文件大於1MB，如下所示：地鐵應用程序的後臺傳輸（上載器）進度問題
*Running: c5593753-d155-425a-8e25-6b1f90bbff85
Progress: c5593753-d155-425a-8e25-6b1f90bbff85, Status: Running
- Sent bytes: 131072 of 1310245 (10%), Received bytes: 0 of 0
Progress: c5593753-d155-425a-8e25-6b1f90bbff85, Status: Running
- Sent bytes: 1310245 of 1310245 (100%), Received bytes: 0 of 0*
因此，我的進度條也顯示出100％，即課程wrong.Now，有時上傳完成後，我得到如下：
*Progress: c5593753-d155-425a-8e25-6b1f90bbff85, Status: Completed
- Sent bytes: 1310245 of 1310245 (100%), Received bytes: 49 of 49
Completed: c5593753-d155-425a-8e25-6b1f90bbff85, Status Code: 200
- Response updated; Header count: 9*
所以在某種意義上向上裝載機工作但再次這個錯誤導致該文件沒有完成100％，實際上，我已經測試了一個10 MB的文件，是起訴仍然是一樣的。100％和「完成」狀態的進度只有在3分鐘後纔會發生。
我使用的是相同的上傳示例，http://code.msdn.microsoft.com/windowsapps/Background-Transfer-Sample-d7833f61。
是我所使用的代碼如下：
private async void StartUpload_Click(object sender, RoutedEventArgs e)
{
if (ApplicationView.Value == ApplicationViewState.Snapped && !ApplicationView.TryUnsnap())
{
rootPage.NotifyUser("File picker cannot be opened in snapped mode. Please unsnap first.", NotifyType.ErrorMessage);
return;
}
FileOpenPicker picker = new FileOpenPicker();
picker.FileTypeFilter.Add("*");
StorageFile file = await picker.PickSingleFileAsync();
Uri uri;
string uploadFileURl = "https://dummy.com/Link1/Link2";
if (!Uri.TryCreate(uploadFileURl, UriKind.RelativeOrAbsolute, out uri))
{
rootPage.NotifyUser("Invalid URI.", NotifyType.ErrorMessage);
return;
}
if (file == null)
{
rootPage.NotifyUser("No file selected.", NotifyType.ErrorMessage);
return;
}
BackgroundUploader uploader = new BackgroundUploader();
uploader.Method = "POST";
uploader.SetRequestHeader("uid", "[email protected]");
uploader.SetRequestHeader("pwd","test");
uploader.SetRequestHeader("file_name", file.Name);
uploader.SetRequestHeader("p", "/");
//just hard coding the particular file size for sample here
Int64 size = 221390;
uploader.SetRequestHeader("file_size", size.ToString());
UploadOperation upload = uploader.CreateUpload(uri, file);
// Attach progress and completion handlers.
await HandleUploadAsync(upload, true);
}
private async Task HandleUploadAsync(UploadOperation upload, bool start)
{
try
{
LogStatus("Running: " + upload.Guid, NotifyType.StatusMessage);
Progress<UploadOperation> progressCallback = new Progress<UploadOperation>(UploadProgress);
if (start)
{
// Start the upload and attach a progress handler.
await upload.StartAsync().AsTask(cts.Token,progressCallback);
}
else
{
// The upload was already running when the application started, re-attach the progress handler.
await upload.AttachAsync().AsTask(cts.Token, progressCallback);
}
ResponseInformation response = upload.GetResponseInformation();
LogStatus(String.Format("Completed: {0}, Status Code: {1}", upload.Guid, response.StatusCode),
NotifyType.StatusMessage);
}
catch (TaskCanceledException)
{
LogStatus("Canceled: " + upload.Guid, NotifyType.StatusMessage);
}
catch (Exception ex)
{
throw;
}
}
private void UploadProgress(UploadOperation upload)
{
MarshalLog(String.Format("Progress: {0}, Status: {1}", upload.Guid, upload.Progress.Status));
BackgroundUploadProgress progress = upload.Progress;
double percentSent = 100;
if (progress.TotalBytesToSend > 0)
{
percentSent = progress.BytesSent * 100/progress.TotalBytesToSend;
}
//MarshalLog(String.Format(" - Sent bytes: {0} of {1} ({2}%)",
// progress.BytesSent, progress.TotalBytesToSend, percentSent));
MarshalLog(String.Format(" - Sent bytes: {0} of {1} ({2}%), Received bytes: {3} of {4}",
progress.BytesSent, progress.TotalBytesToSend, percentSent,
progress.BytesReceived, progress.TotalBytesToReceive));
if (progress.HasRestarted)
{
MarshalLog(" - Upload restarted");
}
if (progress.HasResponseChanged)
{
// We've received new response headers from the server.
MarshalLog(" - Response updated; Header count: " + upload.GetResponseInformation().Headers.Count);
// If you want to stream the response data this is a good time to start.
// upload.GetResultStreamAt(0);
}
}