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Posted 17 Jan 2012

Counting lines in a string

, 17 Jan 2012 CPOL
I had to do something like this in XSLT. If the string is not too long (for some definition of "too long"), you can replace all newlines with "" and then take the difference in the two string lengths.


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9 Jan 2012
Can't we have something as below?int n=(s.Split(new char[]{'\n'})).Length;where n is the number of lines?
10 Jan 2012
Luc Pattyn
You shouldn't be working with huge strings at all.If this represents a file's content, read it using File.ReadAllLines() and take the array's Length.Otherwise, count the lines while you collect the data, not afterwards.Dealing with a huge string isn't doing the caches any favors.And if...
17 Jan 2012
Jon Bellamy
Again, going with other people's comments about memory, how about using a Streamreader? (I haven't tested the timings (or code) but from memory..This should be fast (and memory efficient) least in my experience.StreamReader sr = new StreamReader("Put file here");Int32 cnt =...
9 Jan 2012
I've compared your favorite with seven alternatives:static long LinesCount(string s) { long count = 0; int position = 0; while ((position = s.IndexOf('\n', position)) != -1) { count++; position++; // Skip this occurance! } ...
18 Jun 2012
8 alternatives  
It seems like an obvious requirement, but the .NET framework will not count occurrences of a character in a string. It's easy to do, but which way is the quickest?
11 Jan 2012
George Swan
How about using the extension method: return s.Count(c => (c == '\n'));
17 Jan 2012
Roman Shero
Hello! Great tip!What do you think about this extension method:public static class StringExtension{ public unsafe static long LineCount(this string s) { long lineCount = 1; fixed (char* pchar = s) { char* p = pchar; for (; *p...
28 Feb 2012
Andreas Gieriet
Great analysis!I found out that Regex can be accelerated by a factor of about two.Instead of new Regex(@"\n", RegexOptions.Compiled|RegexOptions.Multiline);you can speed up by using:new Regex(@"^.*?$", RegexOptions.Compiled|RegexOptions.Multiline);But admittedly, nothing beats...


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About the Author

Greg Baryza
Program Manager InterSystems Corporation
United States United States
Greg has over 40 years of experience in software and hardware development. He has managed application, operating
systems, compiler, and database development groups; run multi-product documentation teams; directed customer service organizations; project-managed multi-million dollar projects; and directed product management and marketing operations groups. His experience includes liaison responsibilities with international organizations, particularly in Japan.

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