c# - 等待的任务能否在 IsCompleted 中返回 false

Question

我找到了这段代码:

Task task = DoSomethingAsync( someObject );
await task.ConfigureAwait( false );
if ( task.IsCompleted ){ ... }

我想知道我是否可以安全地替换它

await DoSomethingAsync( someObject ).ConfigureAwait( false );

并删除 if 子句。

我的问题:当等待的任务返回时，task.IsCompleted 是否可以为 false？

documentation of IsCompleted 告诉我们:

true if the task has completed (that is, the task is in one of the three final states: RanToCompletion, Faulted, or Canceled); otherwise, false.

我查找了可能的 states但是当等待的任务返回时，我仍然不清楚哪种状态是可能的。

请帮我解释一下这个问题。提前致谢。

Answer 1

Docs: await operator (C# reference)

The await operator suspends evaluation of the enclosing async method until the asynchronous operation represented by its operand completes.

在 任务之后 taskInstance = ...; await taskInstance;，taskInstance.IsCompleted 将始终为真。