How Can I Asynchronously Wait for a Task with a Timeout?

Managing Asynchronous Tasks: Implementing Timeouts

Efficient asynchronous programming requires managing task completion. Sometimes, however, we need to impose time limits on this waiting process. This article details a method for asynchronously awaiting a Task<T> while respecting timeout constraints.

The Solution: Combining Task.WhenAny() and Task.Delay()

The core of this solution lies in the combined use of Task.WhenAny() and Task.Delay(). Task.WhenAny(task1, task2) waits for the first of two tasks to finish. We leverage this by creating a Task.Delay() representing our timeout period.

Task.WhenAny() monitors both the target task and the timeout task concurrently. If the target task completes before the timeout, Task.WhenAny() returns the target task. Otherwise, it returns the Task.Delay() task, indicating timeout.

Extending the Solution: Incorporating Cancellation

For enhanced control, consider adding cancellation support. Pass a cancellation token to both the target task and Task.Delay(). This enables immediate cancellation from either source. Careful handling of cancellation and task completion is crucial to prevent race conditions.

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