Fire and Forget vs. Awaiting in Async/Await: What's the Difference and When Should You Use Each?

Fire and Forget and Awaiting in Async/Await: Differences and usage scenarios

The following code shows the different ways of calling the Callee method and their behavioral differences.

Call #1: Fire and Forget (Simple)

Callee The method is called asynchronously and does not block the caller.

Call #2: Awaiting task (delay)

The

Callee method uses the await keyword and the caller waits for it to complete. Since the Callee method contains a 1000ms delay, it will take more than a second for the caller.

Call #3 & #5: Task.Run(Fire and Forget)

Task.Run Submits the Callee method to the thread pool for execution. Since await is not used, both calls are Fire and Forget and do not block the caller.

Call #4 & #6: Task.Run(Await task)

Similar to #3 and #5, but Task.Run uses await internally. This makes them equivalent to #2, the caller will wait for the task to complete.

The difference between #3 and #5

While #3 and #5 both use Task.Run, there are subtle differences. In #3, Callee is called directly to create a new task on the thread pool. In #5, Callee is wrapped in an async lambda expression, which creates a new task with its own state machine. However, since both missions are Fire and Forget, the difference isn't significant in this case.

Notes on Service Fabric

After migrating to Service Fabric, HostingEnvironment.QueueBackgroundWorkItem is no longer supported. While it is possible to use Task.Run as an alternative, it is better to use a separate background process and communicate with it via a queue. This ensures isolation between front-end and back-end services, preventing performance issues or deadlocks.

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