Does Task.WhenAny prioritize some tasks over others?

Question

将多个已完成的任务传递给Task.WhenAny时，Task.WhenAny会优先选择完成哪个任务将返回任务？

Answer 1

When you want to know the exact behavior, you can often check the reference source . For instance, WhenAny can be found here .

When looking through the source, note that the returned task is not one of your tasks, but an internally-created task (either a CompleteOnInvokePromise instance or continuation of it), whose Result will be one of your tasks. In the case where you are passing completed tasks into WhenAny , the Result is immediately set to the first completed task it encounters.