当没有任务等待时,如何适当延迟

Windows中的计时器分辨率约为16毫秒,因此任何低于16毫秒的延迟都无法精确实现。这适用于任何计时器,.NET计时器只是Windows本机计时器的包装器。

TaskCompletionSource<T> 然后返回一个 Task 这是可以期待的。

class OutputRetriever
{
    private readonly ConcurrentBag<string> _allMessages = new ConcurrentBag<string>();

    private readonly TaskCompletionSource<string[]> _taskSource
        = new TaskCompletionSource<string[]>();

    // Note: this method is not async anymore
    public Task<string[]> GetAllOutput()
    {
        // We just return a task that can be awaited
        return _taskSource.Task;
    }

    void ConsoleDataReceived(object sender, DataReceivedEventArgs e)
    {
        _allMessages.Add(e?.Data);
        if (e?.Data == "success")
        {
            // Here we notify that the task is completed by setting the result
            _taskSource.SetResult(_allMessages.ToArray());
        }
    }
}

现在客户可以像往常一样等待结果:

var receiver = new OutputReceiver();
string[] messages = await receiver.GetAllOutput();