Task.WhenAny for first completion in C Sharp (C#) - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does Task.WhenAny do in C#?

Task.WhenAny waits for any one of a set of tasks to complete and returns the first completed task.

beginner

How do you get the result of the first completed task when using Task.WhenAny?

After Task.WhenAny returns, you can access the Result property of the returned task if it is a Task<T>.

beginner

True or False: Task.WhenAny waits for all tasks to complete before returning.

False. Task.WhenAny returns as soon as any one task completes.

intermediate

What type does Task.WhenAny return?

It returns a Task<Task> representing the first completed task.

intermediate

Why might you use Task.WhenAny instead of Task.WhenAll?

You use Task.WhenAny when you want to proceed as soon as the first task finishes, instead of waiting for all tasks.

What does Task.WhenAny return?

A A list of all task results

B All tasks after completion

C The last completed task

D The first completed task

Task.WhenAny returns the first task that completes among the given tasks.

If you want to wait for all tasks to finish, which method should you use?

A Task.WhenAny

B Task.WhenAll

C Task.WaitAny

D Task.WaitAll

Task.WhenAll waits for all tasks to complete before continuing.

After Task.WhenAny completes, how do you get the result of the first finished task if it returns a value?

A Use <code>await</code> on the returned task and access <code>Result</code>

B Use <code>Task.WaitAll</code>

C Use <code>Task.Result</code> on the original tasks

D You cannot get the result

You await the returned task and then access its Result property.

Which of these is a valid use case for Task.WhenAny?

A Start multiple downloads and process the first one that finishes

B Wait for all downloads to finish before processing

C Cancel all tasks immediately

D Run tasks sequentially

Task.WhenAny is useful when you want to act on the first completed task, like the first finished download.

What happens to the other tasks after Task.WhenAny returns?

A They complete immediately

B They are automatically cancelled

C They continue running unless cancelled

D They throw exceptions

Other tasks keep running unless you explicitly cancel them.

Explain how Task.WhenAny works and when you would use it.

Think about situations where you want to proceed as soon as one task finishes.

Describe the difference between Task.WhenAny and Task.WhenAll.

Compare waiting for one task vs. waiting for all tasks.