在C＃中将TimeSpan舍入为100 ms [英] Rounding a TimeSpan to 100 ms in C#

问题描述

我正在计算一个计时器的刻度，我用它来发送一个自定义函数的自定义函数，该函数使用00h：00m：00s格式的文本更新标签。 000毫秒：

I'm counting ticks from a timer which I use to send a double to a custom function which updates a label with text in the format of 00h : 00m : 00s . 000 ms :

private string TimeRetrieval(double milliseconds)
{
    TimeSpan tmspan = TimeSpan.FromMilliseconds(milliseconds);

    string timelapse = string.Format("{0:D2}:{1:D2}:{2:D2}.{3:D3}",
    tmspan.Hours,
    tmspan.Minutes,
    tmspan.Seconds,
    tmspan.Milliseconds);


    return timelapse;
}

它有效，但我只想显示从小时到十分之一秒，如下所示：00： 00：00.0不是精确的毫秒。我用谷歌搜索和Binged搜索并寻找了几天应该是一个简单的答案。其他社区中接受的某些代码在编译之前会出错。我使用的是较旧的笔记本电脑，因此我使用C＃2008 ee和.NET 4.0运行XP SP3。 4.0支持TimeSpans的自定义格式，所以我有点困惑为什么我在使用适用于其他人的代码时遇到问题。我已经阅读了.f参数，但它对我不起作用。我错过了参考吗？有人可以解释如何正确地圆到最接近的十分之一秒？如果有必要知道我正在制作一个自定义视频播放器，这将是播放标记参考。还有什么是timer.interval的正确值，以便以适当的速度计算1秒？谢谢你的帮助。

It works but what I only want to display from hours to tenths of a second, like this: 00:00:00.0 not exact milliseconds. I have Googled and Binged and search and sought for days for what should be a simple answer. Some code accepted in other communities gives errors prior to compilation. I am using an older laptop so I'm running XP SP3 with C# 2008 ee and .NET 4.0. 4.0 supports custom formatting of TimeSpans so I'm a bit confuzzled as to why I'm having issues using code which works for others. I've read up on the .f parameter but it doesn't work for me. Am I missing a reference ? Could someone please explain how to round properly to the nearest tenth of a second ? If it helps to know I am making a custom video player and this will be the playback marker reference. Also what is the proper value for timer.interval so that 1 second is counted at the proper speed ? I thank you for your help.

推荐答案

你提到ticks，但你的输入参数是一个名为'毫秒的双。因为每毫秒有10,000个刻度;十分之一秒将是100毫秒== 1毫秒的嘀嗒声，我想知道你是否真的在传递'滴答值'。我们在这里是同一页吗？



有精确，然后在.NET中有准确度：;在编码中需要仔细考虑这些术语：本文可能有助于您理解使用WinForms Timer Control ...或使用DateTime Struct或使用DateTime.Now可能缺少准确性： [ ^ ]。



如果您确实需要最高精度，在毫秒级别，我建议您切换到使用'StopWatch对象可能具有纳秒精度：[ ^ ]。



为了解决为什么我在使用适合其他人的代码时出现问题，我有点困惑。对于这类问题，如果您按原样显示代码的具体示例，并清楚地显示当前结果和预期结果，将会很有帮助。

You mention "ticks," but your input parameter is a double named 'milliseconds. Since there are 10,000 ticks per millisecond; a tenth of a second would be 100 milliescond == 1 millio ticks, I wonder if you are actually passing in the 'ticks value. Are we on the same page here ?

There's "precision," and then there's "accuracy:" in .NET; those terms need to be carefully considered in coding: this article may be useful in your understanding the possible lack of accuracy with using a WinForms Timer Control ... or using DateTime Struct, or using DateTime.Now: [^].

If you really need the best accuracy available, at the millisecond level, I suggest you switch to using the 'StopWatch object which has possible nanosecond precision: [^].

"I'm a bit confuzzled as to why I'm having issues using code which works for others." For this type of question, it is helpful if you shown a concrete example of your code as is, and clearly show the current result, and the expected result.

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