AddAsync(driveItem) does not return

问题

The .AddAsync(driveItem) in the following code never returns. Could anyone shed some light on this?

IPublicClientApplication publicClientApplication = PublicClientApplicationBuilder
    .Create(App.ClientId)
    .Build();

DeviceCodeProvider authProvider = new DeviceCodeProvider(
    publicClientApplication,
    new string[] { "Files.ReadWrite.All" });

GraphServiceClient graphClient = new GraphServiceClient(authProvider);
DriveItem driveItem = new DriveItem
{
    Name = "Foo",
    Folder = new Folder { },
    AdditionalData = new Dictionary<string, object>()
    { { "@microsoft.graph.conflictBehavior", "fail" }
    }
};
await graphClient
    .Me
    .Drive
    .Root
    .Children
    .Request()
    .AddAsync(driveItem);

[Edit 1]

I have tried folder names other than "Foo", tried names of existing or non-existing folders to no avail.

I also tried "rename" instead of "fail" for "@microsoft.graph.conflictBehavior" to no avail.

I also tried without AdditionalData to no avail.
[Edit 2] I decided to wait for the method to return for a while (more than 10 minutes), and it finally threw an exception:

Code: generalException Message: An error occurred sending the request.

Source "Microsoft.Graph.Core"

  at Microsoft.Graph.HttpProvider.<SendRequestAsync>d__19.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.Graph.HttpProvider.<SendAsync>d__18.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.Graph.BaseRequest.<SendRequestAsync>d__35.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.Graph.BaseRequest.<SendAsync>d__31`1.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()

Inner Exception:

Code: generalException Message: Unexpected exception occured while authenticating the request.

   at Microsoft.Graph.Auth.DeviceCodeProvider.<GetNewAccessTokenAsync>d__14.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.Graph.Auth.DeviceCodeProvider.<AuthenticateRequestAsync>d__13.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.Graph.AuthenticationHandler.<SendAsync>d__16.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Net.Http.HttpClient.<FinishSendAsyncBuffered>d__62.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.Graph.HttpProvider.<SendRequestAsync>d__19.MoveNext()

[Edit 3]

The following code has exactly the same problem:

IDriveItemChildrenCollectionPage children = await graphClient.Me.Drive.Root.Children
    .Request()
    .GetAsync();

This looks like a general problem for the Graph SDK.

[Edit 4]

I played the app registration of Azure Active Directory, and got the following most inner exception:

AADSTS70000: The provided value for the input parameter 'device_code' is not valid.
Trace ID: 7067d5e9-d811-49ed-9b8b-7a0b9a0c4c00
Correlation ID: a4faa514-debc-47dc-8ef3-0b9853949e28
Timestamp: 2020-01-11 06:47:36Z

Again, I have to wait for more than 10 minutes for the exception to be thrown.

[Edit 5] Not sure why exactly the same calls using Microsoft.Toolkit.Graph.Controls work perfectly.

await provider.Graph.Me.Drive.Root.Children
.Request()
.AddAsync(driveItem);

回答1:

I'm not sure why this isn't returning, but Camera Roll is one of the special folders (and therefore a reserved folder name). There are a small number of these that get automatically generated either when the Drive is provisioned or when a specific service connects for the first time (i.e. "Camera Roll" is created by the OneDrive app):

• Documents
• Photos
• Camera Roll
• App Root
• Music

In order to retrieve the Camera Roll folder, you request it by it's "id":

GET /me/drive/special/cameraroll

来源：https://stackoverflow.com/questions/59686896/addasyncdriveitem-does-not-return