C# 查找 TimeSpan 集合的平均值

Find average of collection of TimeSpans

提问by hs2d

I have collection of TimeSpans, they represent time spent doing a task. Now I would like to find the average time spent on that task. It should be easy but for some reason I'm not getting the correct average.

我收集了 TimeSpans，它们代表执行任务所花费的时间。现在我想找出在该任务上花费的平均时间。这应该很容易，但由于某种原因，我没有得到正确的平均值。

Here's my code:

这是我的代码：

private TimeSpan? GetTimeSpanAverage(List<TimeSpan> sourceList)
{
    TimeSpan total = default(TimeSpan);

    var sortedDates = sourceList.OrderBy(x => x);

    foreach (var dateTime in sortedDates)
    {
        total += dateTime;
    }
    return TimeSpan.FromMilliseconds(total.TotalMilliseconds/sortedDates.Count());
}

采纳答案by vc 74

You can use the Average extension method:

您可以使用平均扩展方法：

double doubleAverageTicks = sourceList.Average(timeSpan => timeSpan.Ticks);
long longAverageTicks = Convert.ToInt64(doubleAverageTicks);

return new TimeSpan(longAverageTicks);

回答by George Duckett

var average = new TimeSpan(sourceList.Select(ts => ts.Ticks).Average());

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Note, your method returns a Nullable, but doesn't need to, unless you want to return null if the source list is empty, in which case just do a separate check first.

请注意，您的方法返回一个Nullable，但不需要，除非您想在源列表为空时返回 null，在这种情况下只需先进行单独检查。

回答by V4Vendetta

In Addition to the above answer, I would suggest you take an average on the Seconds or MilliSeconds level (depending on what you require)

除了上述答案之外，我建议您取秒或毫秒级别的平均值（取决于您的要求）

sourceList.Average(timeSpan => timeSpan.ToTalMilliseconds)

Now using this value you could arrive at the new TimeSpan using

现在使用这个值，你可以使用

TimeSpan avg = TimeSpan.FromMilliseconds(double value here)