System.Threading.Tasks.TaskCanceledException on DisposeAsync

[alphamax]

Hello,

Thanks for your support, our live production raise errors on a given part of the code :

System.Threading.Tasks.TaskCanceledException: A task was canceled.
   at Microsoft.JSInterop.JSRuntime.InvokeAsync[TValue](Int64 targetInstanceId, String identifier, Object[] args)
   at Toolbelt.Blazor.FileDropZone.FileDropZone.RunAsync[TJSObject,TResult](TJSObject jSObject, Func`2 action, TResult defaultValue)
   at Toolbelt.Blazor.FileDropZone.FileDropZone.RunAndDisposeAsync[TJSObject,TResult](TJSObject jSObject, Func`2 action, TResult defaultValue)
   at Toolbelt.Blazor.FileDropZone.FileDropZone.DisposeAsync()
   at Microsoft.AspNetCore.Components.RenderTree.Renderer.<ProcessDisposalQueueInExistingBatch>g__GetHandledAsynchronousDisposalErrorsTask|87_0(Task result)

Do you have any idea to "correct" this pattern ?

Thanks,

Regards,

[jsakamoto]

Hi @alphamax,
Thank you for your report.
Unfortunately, I’m not sure why this exception is occurring. Do you have any additional information, such as when the exception was thrown or what user action triggered it? It would be very helpful if you could provide a sample project that reproduces the issue.

[alphamax]

Thanks for your quick reply 🙏🏻
On our side, it is in our production environment.
In fact I think it is when a user is "closing" the page or when a context is lost. But our server gets this exception.
I admit I did not had this error in dev, due to high quality link between Server & Client (Blazor Server Interactive mode).

[jsakamoto]

Thank you for your reply.

I would really like to fix this problem. But unfortunately, I cannot reproduce the same behavior on my side now, even though you provided me with information. So it will take me a long time to investigate and resolve it.

On the other hand, I still do not understand clearly why the TaskCanceledException happens. Because of that, I think it could be risky to just catch and ignore the exception without knowing the real reason.

Also, I have some other tasks that I need to focus on first, actually. So, if possible, I would like to put off working on this issue for a while.

Can I ask how serious this problem is for you? If it is urgent, one possible workaround is to fork this project and create your own custom version that catches and ignores the TaskCanceledException on your own decision.

What do you think about my opinion above?