Microsoft Graph API - An error occurred sending the request on reading file

Question

I m trying to read a file from OneDrive using official SDK and a code from OneDrive API Browser Sample as follows.

var stream = await graphClient.Drives[drive.Id].Items[item.Id].Content.Request().GetAsync();

Where drive.Id and item.Id are valid IDs retrieved by previous successful calls to Graph.

I receive the following error.

An error occurred sending the request. Microsoft.Graph.ServiceException at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)

Another time I got more detailed exception.

at Microsoft.Graph.HttpProvider.d__21.MoveNext() at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.Graph.HttpProvider.d__20.MoveNext() at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.Graph.HttpProvider.d__19.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.Graph.BaseRequest.d__36.MoveNext() at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.Graph.BaseRequest.d__34.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()

How can I resolve this issue?

I ve spent a lot of time and started to suspect throttling. But it was hard to decide exactly. Then I gave up and put it aside for 3 days. After a pause, I retried very same code and it worked perfectly. I assume it was throttling. — Boris Zinchenko
– Boris Zinchenko, Commented Oct 3, 2021 at 15:53

Shweta · Accepted Answer · 2021-10-01 07:07:08Z

1

Try this -

// get reference to stream of file in OneDrive
GraphServiceClient graphClient = GetAuthenticatedGraphClient(...);
var fileStream = graphClient.Drives[drive.Id].Items[fileId]
                                     .Content
                                     .Request()
                                     .GetAsync()
                                     .Result;

var currentFolder = System.IO.Directory.GetCurrentDirectory();
var driveItemPath = Path.Combine(currentFolder, "proposal.docx");

// save stream to the local file
var driveItemFile = System.IO.File.Create(driveItemPath);
fileStream.Seek(0, SeekOrigin.Begin);
fileStream.CopyTo(driveItemFile);

answered Oct 1, 2021 at 7:07

Shweta

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1 Comment

Boris Zinchenko Over a year ago

Thank you for the suggestion, @Shweta. Funny enough, I started from this. But had request errors. Then I thought that it is due to sync call and rewrote code async. It failed also. I ve spent a lot of time and started to suspect throttling. But it was hard to decide exactly. Then I gave up and put it aside for 3 days. After a pause, I retried very same code and it worked perfectly. I assume it was throttling. I do not mark your suggestion as answer. Your code is correct. My code is also correct. Throttling seems real reason.

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