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How do you handle unhandled exceptions in asynchronous code?

Senior ASP.NET Web API
Quick Answer Unhandled exceptions in async code: exceptions in fire-and-forget tasks (Task.Run without await) are swallowed. Fix: always await tasks or attach .ContinueWith for error handling. Set TaskScheduler.UnobservedTaskException to log errors from abandoned tasks. In controllers: always await async calls - never return void from async action methods. Use IHostedService with proper exception handling for background work.

Answer

To handle async exceptions:

  • Wrap async operations in try/catch.
  • Ensure thrown exceptions bubble to global exception middleware.
  • Capture structured logs for debugging.
  • Avoid async void except for event handlers.
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