How should a BackgroundService handle graceful shutdown?

Graceful shutdown in BackgroundService

Explain how a .NET BackgroundService should handle cancellation, in-flight work, and application shutdown.

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TL;DR

A BackgroundService receives a stopping token in ExecuteAsync and should observe it in waits and dependency calls. When shutdown begins, the worker stops accepting new work and either completes the current item within the available window or leaves it recoverable for another attempt. It should not abandon a durable message after acknowledging it, and it should not hold shutdown forever. Cleanup belongs in finally blocks, disposal, or StopAsync according to who owns each resource.

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Hosted service lifecycle, cancellation token usage, draining work, in-flight operations, and deployment behavior.

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Why this question matters
Graceful shutdown gives a worker time to stop taking new work and leave in-flight work in a recoverable state. The correct behavior depends on message acknowledgement, idempotency, leases, and the host's finite shutdown window.
A BackgroundService receives a stopping token in ExecuteAsync and should observe it in waits and dependency calls. When shutdown begins, the worker stops accepting new work and either completes the current item within the available window or leaves it recoverable for another attempt. It should not abandon a durable message after acknowledging it, and it should not hold shutdown forever. Cleanup belongs in finally blocks, disposal, or StopAsync according to who owns each resource.
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For a queue consumer, I stop fetching messages when cancellation is requested, then decide whether the current handler can finish safely before the host deadline. I acknowledge the message only after the durable work succeeds; otherwise I abandon it or let its visibility lease expire so another worker can retry. Handlers remain idempotent because a process can still crash after committing work but before acknowledgement. Long operations checkpoint progress or split into smaller messages instead of assuming every deployment grants unlimited drain time.

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Details

Ignoring the stopping token.
Acknowledging a message before durable processing succeeds.
Killing in-flight work with no retry path.
Letting shutdown hang indefinitely.
Never testing deployment/shutdown behavior.

How should a BackgroundService handle graceful shutdown?

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