C# Timespan Milliseconds vs TotalMilliseconds

问题

In the example below, why does the Milliseconds property return 0 but the TotalMilliseconds property return 5000

// 5 seconds
TimeSpan intervalTimespan = new TimeSpan(0, 0, 5);

// returns 0
intervalTimespan.Milliseconds;

// returns 5000.0
intervalTimespan.TotalMilliseconds

回答1:

Simple:

Milliseconds are the remaining milliseconds, that don't form a whole second.
TotalMilliseconds is the complete duration of the timespan expressed as milliseconds.

回答2:

Because Milliseconds returns the Milliseconds portion, and TotalMilliseconds returns the total milliseconds represented by the Timespan

Example: 0:00:05.047

Milliseconds: 47

Total Milliseconds: 5047

回答3:

This hapens because intervalTimespan.Milliseconds; returns the milisecond component of the timespan. In your timespan constructor you only have hour minute and second component, that is why the result is 0. intervalTimespan.TotalMilliseconds - This gets you the total miliseconds of the timespan. Ex:

// 5 miliseconds
TimeSpan intervalTimespan = new TimeSpan(0, 0,0,0,5);

// returns 5
intervalTimespan.Milliseconds;

// returns 5
intervalTimespan.TotalMilliseconds

回答4:

It's obvious, Miliseconds returns just the milisenconds part of your TimeSpan, while TotalMiliseconds calculates how many miliseconds are in time represented by TimeSpan.

In your case, first returns 0 because you have exactly 5 seconds, second returns 5000 because 5s == 5000ms

回答5:

TimeSpan has other overloads

TimeSpan(hour, minute, seconds)
TimeSpan(days, hour, minute, seconds)
TimeSpan(days, hour, minute, seconds, milliseconds)

Milliseconds property will return the actual milliseconds value

TotalMilliseconds returnss overall milliseconds including days, hour, minute & seconds

回答6:

One important thing other things don't mention, is that (according to the docs):

The Milliseconds property represents whole milliseconds, whereas the TotalMilliseconds property represents whole and fractional milliseconds.

That is also deductible from the remarks of TotalMilliseconds:

This property converts the value of this instance from ticks to milliseconds.

This has a huge implication, IMO, because if you want the most precise representation in seconds or milliseconds, you must use TotalSeconds or TotalMilliseconds properties, both of them are of type double.

来源：https://stackoverflow.com/questions/5484382/c-sharp-timespan-milliseconds-vs-totalmilliseconds

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