TimeSpan 与毫秒精度的比较 [英] TimeSpan comparison with millisecond precision

问题描述

我在这里遇到了一些很奇怪的事情，但我不确定是不是我知道 TimeSpan API 错误.以下打印出 false，我不知道为什么:

I'm hitting something here which is very odd but I'm not sure whether it's me knowing the TimeSpan APIs wrong. The following prints out false and I'm not sure why:

var foo = TimeSpan.FromMilliseconds(123.34d);
var bar = TimeSpan.FromMilliseconds(123.33d);
Console.WriteLine(foo > bar);

以下打印true:

var foo = TimeSpan.FromMilliseconds(123.34d);
var bar = TimeSpan.FromMilliseconds(123.33d);
Console.WriteLine(foo == bar);

TimeSpan.FromMilliseconds 在进行比较时不考虑毫秒精度吗?

Doesn't TimeSpan.FromMilliseconds take millisecond precision into account while doing the comparison?

推荐答案

TimeSpan 只是四舍五入你传递的毫秒数，所以 123.33 和 123.34 最终代表 123 毫秒的时间跨度.123.5 将四舍五入为 123 毫秒.

TimeSpan simply rounds the number of milliseconds that you pass it, so both 123.33 and 123.34 end up representing a timespan of 123 milliseconds. 123.5 would be rounded up to 123 milliseconds.

如果您需要更高的精度，请自己计算一下刻度:

If you need better precision, do the math with the ticks yourself:

var foo = TimeSpan.FromTicks((long)(123.34*TimeSpan.TicksPerMillisecond));
var bar = TimeSpan.FromTicks((long)(123.33*TimeSpan.TicksPerMillisecond));
Console.WriteLine(foo > bar);

现在您的程序生成 True(demo).

Now your program produces True (demo).

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