Count line by searching crlf (0d0a)

Question

I would like to count number of lines in a file based on crlf (0D0A) count. My current code only counting the number of lines based on cr (0D). Can anybody give suggestion ?

public static int Countline(string file)
{
    var lineCount = 0;
    using (var reader = File.OpenText(file))
    {
        while (reader.ReadLine() != null)
        {
            lineCount++;
         }
    }
    return lineCount;
}

probably duplicate: http://stackoverflow.com/questions/6655246/how-to-read-text-file-by-particular-line-separator-character — Bogdan Kuštan, Jul 04 '16 at 07:40
Convert it to byte array using proper encoding. Then find any CR LF (0x0D 0x0A) using for loop. — , Jul 04 '16 at 07:43
you could use String.Split `foo.Split(new [] {Environment.NewLine}, StringSplitOptions.RemoveEmptyEntries).Length;` — Nitro.de, Jul 04 '16 at 07:48
not a duplicate. most only search for either /r or /n. i need to search both together not seperated. — jejakakhai Jk, Jul 04 '16 at 08:18

score 0 · Accepted Answer · answered Jul 04 '16 at 07:50

0

Usage:

Countline("text.txt", "\r\n");

Method:

public static int Countline(string file, string lineSeperator)
{
    string text = File.ReadAllText(file);

    return System.Text.RegularExpressions.Regex.Matches(text, lineSeperator).Count;
}

answered Jul 04 '16 at 07:50

Zein Makki

29,485
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this is a good step however have memory constrain as it first read all line in file. I have thousand of data in one file. – jejakakhai Jk Jul 04 '16 at 07:54

score 0 · Answer 2 · answered Jul 04 '16 at 07:56

string content = System.IO.File.ReadAllText( fileName );
int numMatches = content.Select((c, i) => content.Substring(i)).Count(sub => sub.StartsWith(Environment.NewLine));

Note I'm using Environment.NewLine for line endings but you can replace with the whole string if you prefer.

score 0 · Answer 3 · edited Sep 12 '22 at 03:57

0

public int CountLines(string Text)
{
    int count = 0;
    foreach (ReadOnlySpan<char> _ in Text.AsSpan().EnumerateLines())
    {
        count++;
    }

    return count;
}

Benchmark:

edited Sep 12 '22 at 03:57

Markus Meyer

3,327
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answered Sep 06 '22 at 16:45

groophy lifefor

1

Count line by searching crlf (0d0a)

3 Answers3