A scary realization

I wanted to find out how much faster using String.Format was, in comparison to just concatenating strings, using "&" ("+" in C#). To do so, I iterated a String.Format-statement and a equivalent concatenation statement 10'000'000 times, calculated the median and created a report. I did this a few times and found the following:

When combining three strings (e.g. "Hello " & strFirstName & "!")

  • String.Format used 96% more memory, taking up 50% more processor time than an &-concatenation.
  • String.Concat used 16% more memory, taking up virtually the same processor time (1 ms more) as an &-concatenation.

When combining seven strings

  • String.Format used 10% less memory, taking up 59% more processor time than an &-concatenation.
  • String.Concat used 2% less memory, taking up 3% less processor time than an &-concatenation.

Conclusion

  • When doing small concatenation, use "&" or "+".
  • When combining more than a few strings, use String.Concat
  • (When combining a large number of strings, use StringBuilder (see earlier posts))

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