How Can I Efficiently Execute and Await Multiple Async Tasks in a Console Application?

Managing Concurrent Asynchronous Operations and Ensuring Completion

This guide demonstrates effective strategies for concurrently executing multiple asynchronous tasks within a console application and verifying their successful completion.

Method 1: Leveraging Task.WhenAll

Contrary to some existing resources, Task.WhenAll provides a straightforward solution for running multiple asynchronous operations simultaneously and waiting for all to finish. Here's an illustration:

<code class="language-csharp">var task1 = PerformTaskAsync();
var task2 = PerformAnotherTaskAsync();

await Task.WhenAll(task1, task2);</code>

Task.WhenAll returns an awaitable task that only completes once all input tasks (in this instance, task1 and task2) have concluded. This ensures subsequent code executes only after all asynchronous operations are finished.

Comparing Task.WaitAll and Task.WhenAll

Both Task.WaitAll and Task.WhenAll wait for task completion, but differ significantly. Task.WaitAll blocks the current thread, whereas Task.WhenAll is non-blocking. Exception handling also differs: Task.WaitAll aggregates exceptions into a single AggregateException, while Task.WhenAll results in a Faulted task containing the aggregated exceptions.

Robust Error Handling

Task.WaitAll throws an AggregateException if any task fails or is canceled. Task.WhenAll returns a Faulted task if any task fails, or a Canceled task if tasks are canceled without any failures. Proper exception handling is crucial to gracefully manage potential errors.

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