任务延迟错误或我做错了什么

本文关键字：错了 什么 延迟 错误 任务 | 更新日期: 2023-09-27 18:19:18

编辑：我做错了什么。问题是使用日期时间对象执行计时代码并输出毫秒而不是总毫秒。

简而言之，我在 .net 4.5 上运行了一个新的 mvc4 项目，在家庭控制器中使用以下代码。

    public async Task<ActionResult> Index()
    {
        Int32[] Delays = new Int32[] { 1999, 500, 20 }; 
        List<String> result = new List<String>();
        var now = DateTime.Now;
        result.Add(String.Format("Started at: {0}", now.ToString("MM/dd/yyyy hh:mm:ss.fff tt")));
        //TAKE 1
        result.Add("Take 1");
        await Task.WhenAll(Delays.Select(async x => result.Add(await Slow(x, now, Array.IndexOf(Delays, x), "take 1"))));
        //TAKE 2
        result.Add("Take 2");
        var tasks = Delays.Select((x, i) => Slow(x, now, i, "take 2")).ToList();
        await Task.WhenAll(tasks);
        result.AddRange(tasks.Select(x => x.Result));
        return View(result);
    }

我的慢速方法看起来像这样... 

    private async Task<String> Slow(Int32 ms, DateTime dt, int i, String take)
    {
        Response.Write(String.Format("[{3}][index:{0}][delay:{2}] pre sleep - {1} <br />", i, DateTime.Now.ToString("MM/dd/yyyy hh:mm:ss.fff tt"), ms, take));
        await Task.Delay(ms);
        Response.Write(String.Format("[{3}][index:{0}][delay:{2}] after sleep - {1} <br />", i, DateTime.Now.ToString("MM/dd/yyyy hh:mm:ss.fff tt"), ms, take));
        var delayedtime = DateTime.Now;
        var diff = delayedtime - dt;
        return String.Format("Slept for : [{2}]{0} miliseconds. diff was : {1}", ms, diff.Milliseconds, take);
    }

输出如下所示...

[take 1][index:0][delay:1999] pre sleep - 06/21/2013 02:46:25.338 PM
[take 1][index:1][delay:500] pre sleep - 06/21/2013 02:46:25.340 PM
[take 1][index:2][delay:20] pre sleep - 06/21/2013 02:46:25.340 PM
[take 1][index:2][delay:20] after sleep - 06/21/2013 02:46:25.368 PM
[take 1][index:1][delay:500] after sleep - 06/21/2013 02:46:25.849 PM
[take 1][index:0][delay:1999] after sleep - 06/21/2013 02:46:27.347 PM
[take 2][index:0][delay:1999] pre sleep - 06/21/2013 02:46:27.347 PM
[take 2][index:1][delay:500] pre sleep - 06/21/2013 02:46:27.347 PM
[take 2][index:2][delay:20] pre sleep - 06/21/2013 02:46:27.347 PM
[take 2][index:2][delay:20] after sleep - 06/21/2013 02:46:27.382 PM
[take 2][index:1][delay:500] after sleep - 06/21/2013 02:46:27.861 PM
[take 2][index:0][delay:1999] after sleep - 06/21/2013 02:46:29.359 PM
Started at: 06/21/2013 02:46:25.336 PM
Take 1
Slept for : [take 1]20 miliseconds. diff was : 32
Slept for : [take 1]500 miliseconds. diff was : 513
Slept for : [take 1]1999 miliseconds. diff was : 11
Take 2
Slept for : [take 2]1999 miliseconds. diff was : 23
Slept for : [take 2]500 miliseconds. diff was : 525
Slept for : [take 2]20 miliseconds. diff was : 46

我对 1999 毫秒的延迟报告它在 5 毫秒后完成这一事实感到非常困惑，而其他两个延迟似乎工作得很好。一旦延迟参数高于"999"毫秒，我就会得到这种行为。

我的问题是我是否做错了什么，延迟是否响应我不知道的配置，或者方法是否被窃听。

任务延迟错误或我做错了什么

diff.Milliseconds测量TimeSpan的ms部分。也许你的意思是：

diff.TotalMilliseconds
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