Throw FileNotFoundException when upload file to onedrive

Question

Hi

I use BackgroundUploadAsync to upload picture or video file to onedrive in my store app. Sometimes it works well, but sometimes it doesn't work, this API throw a FileNotFoundException. But the file path is right, why?

Best Regards,

Luke

Answer 1

你好 Luke，

准确来说你的这个问题已经不属于Windows Store App范畴之内，因为是使用的Live的API上传文件的吧。

不过从你的叙述来看，代码应该没有问题，毕竟你说sometimes it works well，这样的话我会比较推荐你去确认以下几个事项：

1，本地文件是否存在，并且有权限访问 （FileNotFound一般都是这里出现）

2，网络是否随时保证畅通

3，OneDrive上是否有足够的空间上传

或者你的程序里面还有提示其他什么样的信息么，当然你也可以监测一下当出现问题时候的系统环境如何，是否有文件存在之类的。

--James

---

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Answer 2

Thanks, James

可以确定的是，本地文件是存在的，并且有访问权限，OneDrive也有足够的空间上传，网络方面也比较畅通

抛出的异常信息如下：

System.IO.FileNotFoundException was caught

  HResult=-2147024894

  Message=The system cannot find the file specified. (HRESULT からの例外:0x80070002)

  Source=mscorlib

  StackTrace:

       at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

       at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

       at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()

       at Microsoft.Live.LiveUploadOperation.<ExecuteAsync>d__4.MoveNext()

    --- End of stack trace from previous location where exception was thrown ---

       at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

       at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

       at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()

       at FileUploadDownload.MainPage.<btnSelectUploadFile_Click>d__f.MoveNext()

  InnerException:

所以我推测有可能是上传的API读取传入的文件后，又创建了一个缓存文件，对缓存文件的操作出现了问题，或者这个异常其实指的是OneDrive上的文件找不到？

Best Regards,

Luke

Answer 3

Hi Luke,

不好意思，我也不清楚这个API内部是怎么运行的，你可以贴一段代码让我看看吗？是否有用到异步之类的？我认为你还可以测试一下不同大小的文件，比如说小于某个值的必然会成功，大于某个值的要看机器性能之类的。

--James

---

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Answer 4

Hi, James

关于不同的文件的问题，我也有测试，看起来与文件大小、类型等没有什么关系。

非常抱歉，我本想贴一段代码，但提示超出字符数了。

我使用MS放在Github上的sample code测试，这个问题依然会概率性的出现，代码地址如下：

https://github.com/liveservices/LiveSDK-for-Windows/blob/master/src/WinStore/Samples/Windows/XAML/FileUploadDownload/MainPage.xaml.cs

非常感谢您的关注

Best Regards,

Luke

Answer 5

你好 Luke，

尝试吧Try Catch去掉看看具体错误出现在哪里？下面这段代码是Try部分的，可能出现问题的就在加黑的部分。

                string folderPath = this.tbuploadUrl.Text;
                var picker = new FileOpenPicker
                {
                    ViewMode = PickerViewMode.Thumbnail,
                    SuggestedStartLocation = PickerLocationId.PicturesLibrary
                };


                picker.FileTypeFilter.Add("*");
                StorageFile file = await picker.PickSingleFileAsync();
                if (file != null)
                {
                    this.fileName = file.Name;
                    this.progressBar.Value = 0;
                    var progressHandler = new Progress<LiveOperationProgress>(
                        (progress) => { this.progressBar.Value = progress.ProgressPercentage; });


                    this.ShowProgress();
                    this.cts = new CancellationTokenSource();


                    LiveUploadOperation operation = await this.liveClient.CreateBackgroundUploadAsync(
                        folderPath, 
                        file.Name, 
                        file, 
                        OverwriteOption.Rename);
                    LiveOperationResult result = await operation.StartAsync(
                        this.cts.Token, 
                        progressHandler);


                    dynamic fileData = result.Result;
                    string downloadUrl = fileData.id + "/content";
                    this.tbdownloadUrl.Text = downloadUrl;


                    this.ShowMessage("Upload completed");
                }

--James

---

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Answer 6

Hi, James

错误出现在这里

 LiveOperationResult result = await operation.StartAsync(
                        this.cts.Token, 
                        progressHandler);

异常信息和之前贴出来的是一样的

Best Regards,

Luke