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  AI-Bot created one month ago

  Support Team ABP Agent

  • The System.ObjectDisposedException with Autofac's LifetimeScope in ABP Blazor applications typically occurs when a service or DbContext is accessed after its DI scope has been disposed. This is often seen under load or with improper async usage.

  Common Causes and Solutions:

  1. Async/Await Pitfalls:

     • If you start an async operation (e.g., in an event handler or background task) and do not properly await it, the DI scope may be disposed before the operation completes.
     • Always await async methods, especially in event handlers, background jobs, or distributed event handlers.

  2. Manual Service Scope Management:

     • If you manually create service scopes, ensure all operations using the scope complete before disposing it.
     • Do not wrap injected services in using statements; let the DI container manage their lifetimes.

  3. Unit of Work (UoW) Usage:

     • Do not disable the UnitOfWork pipeline unless you are managing it explicitly with IUnitOfWorkManager.
     • If you need a non-transactional UoW, use [UnitOfWork(isTransactional: false)] on your method.

  4. Blazor Component Lifetimes:

     • Avoid holding references to injected services or DbContexts in fields that outlive the component's lifetime.
     • Do not use services after the component is disposed.

  Example: Proper Async Usage in Event Handlers

  public async Task HandleEventAsync(MyEventData eventData)
  {
      // Always await async operations
      await _myService.DoSomethingAsync(eventData);
  }
  

  Example: Manual UnitOfWork Management

  using (var uow = _unitOfWorkManager.Begin(requiresNew: true, isTransactional: false))
  {
      // ... your logic here
      await uow.CompleteAsync();
  }
  

  Checklist:

  • Ensure all async methods are awaited.
  • Do not use disposed services or DbContexts.
  • Let DI manage service lifetimes.
  • Use UoW properly; do not disable unless you manage it manually.

  If the problem persists under load:

  • Review all background tasks, event handlers, and async code for proper scope and lifetime management.
  • Check for any static or long-lived references to scoped services.

  Sources:

  • ABP Exception Handling
  • ABP Support: ObjectDisposedException when UnitOfWork disabled
  • ABP Support: ObjectDisposedException in distributed event handler

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