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TaskCanceledException on SignalR Hub #2848


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dev1.abp.advantiss created

Hi, I'm getting TaskCanceledException: A task was canceled. on SignalR in OnDisconnectedAsync method. It cancels getting entity from DB. This cause problem, but it don't appears in the log. How resolve?

  • ABP Framework version: v4.3.3
  • UI type: Angular
  • DB provider: MongoDB
  • Tiered (MVC) or Identity Server Separated (Angular): yes
  • Exception message and stack trace: at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification) at Project.SignalR.ProjectSessionHub.OnDisconnectedAsync(Exception exception) in D:\Projects\Project\aspnet-core\src\Project.Application\SignalR\ProjectSessionHub.cs:line 103 at Castle.Proxies.ProjectSessionHubProxy.OnDisconnectedAsync_callback(Exception exception) at Castle.Proxies.Invocations.ProjectSessionHub_OnDisconnectedAsync.InvokeMethodOnTarget() at Castle.DynamicProxy.AbstractInvocation.Proceed() at Castle.DynamicProxy.AbstractInvocation.ProceedInfo.Invoke() at Castle.DynamicProxy.AsyncInterceptorBase.

6 Answer(s)
  • User Avatar
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    maliming created
    Support Team Fullstack Developer

    hi

    Can you use await to call the async method instead of .Result?

  • User Avatar
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    dev1.abp.advantiss created

    hi

    Can you use await to call the async method instead of .Result?

    I try, but the same A task was canceled. Stack trace: at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at MongoDB.Driver.Core.ConnectionPools.ExclusiveConnectionPool.<AcquireConnectionAsync>d__38.MoveNext() at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at MongoDB.Driver.Core.Servers.Server.<GetChannelAsync>d__34.MoveNext() at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at MongoDB.Driver.Core.Operations.RetryableReadContext.<InitializeAsync>d__20.MoveNext() at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at MongoDB.Driver.Core.Operations.RetryableReadContext.<CreateAsync>d__1.MoveNext() at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at MongoDB.Driver.Core.Operations.FindOperation``1.<ExecuteAsync>d__120.MoveNext() at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at MongoDB.Driver.OperationExecutor.<ExecuteReadOperationAsync>d__31.MoveNext() at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at MongoDB.Driver.MongoCollectionImpl1.<ExecuteReadOperationAsync>d__981.MoveNext() at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at MongoDB.Driver.MongoCollectionImpl1.<UsingImplicitSessionAsync>d__1061.MoveNext() at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at MongoDB.Driver.IAsyncCursorSourceExtensions.<FirstOrDefaultAsync>d__51.MoveNext() at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Volo.Abp.Domain.Repositories.MongoDB.MongoDbRepository3.<FindAsync>d__6.MoveNext() at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Volo.Abp.Domain.Repositories.MongoDB.MongoDbRepository3.<GetAsync>d__5.MoveNext() at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter1.GetResult() at Project.Sessions.MongoSessionRepository.<GetAsync>d__6.MoveNext() in D:\Projects\Project\aspnet-core\src\Project.MongoDB\Sessions\MongoSessionRepository.cs:line 95 at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Castle.DynamicProxy.AsyncInterceptorBase.<ProceedAsynchronous>d__141.MoveNext() at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Volo.Abp.Castle.DynamicProxy.CastleAbpMethodInvocationAdapterWithReturnValue``1.<ProceedAsync>d__7.MoveNext() at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Volo.Abp.Uow.UnitOfWorkInterceptor.<InterceptAsync>d__2.MoveNext() at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Volo.Abp.Castle.DynamicProxy.CastleAsyncAbpInterceptorAdapter``1.<InterceptAsync>d__31.MoveNext() at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter1.GetResult() at Project.SignalR.ProjectSessionHub.<OnDisconnectedAsync>d__8.MoveNext() in D:\Projects\Project\aspnet-core\src\Project.Application\SignalR\ProjectSessionHub.cs:line 106

  • User Avatar
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    maliming created
    Support Team Fullstack Developer

    Can you try to add CancellationToken.None as the last parameter for the GetAsync method

  • User Avatar
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    dev1.abp.advantiss created

    Can you try to add CancellationToken.None as the last parameter for the GetAsync method

    Yes, I tried it, but still get exception. session = await _sessionRepository.GetAsync(Guid.Parse(sessionId), cancellationToken: CancellationToken.None);

    Exception: System.Threading.Tasks.TaskCanceledException: A task was canceled.

  • User Avatar
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    maliming created
    Support Team Fullstack Developer

    hi

    var cts = new CancellationTokenSource();
    session = await _sessionRepository.GetAsync(Guid.Parse(sessionId), cancellationToken: cts.Token);
    
  • User Avatar
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    dev1.abp.advantiss created

    hi

    var cts = new CancellationTokenSource(); 
    session = await _sessionRepository.GetAsync(Guid.Parse(sessionId), cancellationToken: cts.Token); 
    

    It seems like everything is ok! Thank you for support!

Made with ❤️ on ABP v9.1.0-preview. Updated on December 10, 2024, 06:38