Async/await with/without awaiting (fire and forget)

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I’m asking this, because we’re moving our app to service fabric where we no longer can use HostingEnvironment.QueueBackgroundWorkItem(async cancellationToken => await LongMethodAsync()); and the advice is to simply replace it with Task.Run.

That’s bad advice. You should use a separate background process separated from your web frontend by a queue.

What’s the in-depth logic behind the calls?

  1. Starts the asynchronous method on the current thread. Ignores all results (including exceptions).
  2. Starts the asynchronous method on the current thread. Asynchronously waits for it to complete. This is the standard way of calling asynchronous code.
  3. Starts the asynchronous method on a thread pool thread. Ignores all results (including exceptions).
  4. Starts the asynchronous method on a thread pool thread. Asynchronously waits for it to complete.
  5. Exactly the same as #3.
  6. Exactly the same as #4.

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