Is it quicker to use string.Format or interpolation with $"..."?

Question

Of these two methods of string interpolation (string.Format and the "$" operator), is one better than the other and if so, in what situations and why?

Examples of both doing the same thing:

//string.Format
string s = string.Format("( {0} ) , ( {1} )", string.Join(", ", columnNames),string.Join(", ",values));

//"$" interpolation operator
string s = $"( {string.Join(", ", columnNames)} ) , ( {string.Join(", ", values)} )";

Stack Overflow users are kind of biased against premature optimization, and rightfully so. In general, stuff like this really doesn't matter unless you want to execute it hundreds of thousands of times, while your code is not doing anything else. As soon as disk or network access comes into play, the relatively tiny performance differences, if any, won't matter at all in the bigger picture. See also the classical "If you have two horses and you want to know which of the two is the faster then race your horses.". — CodeCaster
– CodeCaster, Commented Feb 25, 2016 at 10:33
You should check out what StackOverflow's own Nick Craver was tweeting about last night (link to first of a few tweets discussing this). — James Thorpe
– James Thorpe, Commented Feb 25, 2016 at 10:42
Am I the only one who initially read the title to mean "is it quicker to write code using string.Format or interpolation?" and thinking to myself "is this a trick question?" — BoltClock
– BoltClock, Commented Feb 25, 2016 at 15:31

Community · Accepted Answer · 2017-05-23 12:07:30Z

2

String interpolation is turned into string.Format() at compile-time so they should end up with the same result. (link)

edited May 23, 2017 at 12:07

CommunityBot

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answered Feb 25, 2016 at 10:39

M.REJEB

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Comments

norisknofun · Accepted Answer · 2016-02-25 15:27:54Z

0

Benchmark has been done, please check this out

Globally, it is similar to string.Format, but variables may be accessed directly (not through index arguments) so you won't notice any major difference.

But if you are looking for performance, the length of the strings to be concatenate will make the choice between the different concatenantion methods very difficult.

edited Feb 25, 2016 at 15:27

answered Feb 25, 2016 at 10:32

norisknofun

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CodeCaster Over a year ago

Link-only answers aren't answers. Include the relevant details from the link into your answer.

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