textfile reading

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How can I read a specific line of a text file (eg. 3rd line of text file) in C#?

Can you please answer me ~~quickly~~?
:confused:

Posted 31-Aug-10 21:28pm

Jyotshnad

Updated 2-Sep-10 1:50am

Toli Cuturicu

v3

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Comments

Dalek Dave 1-Sep-10 3:29am

Minor Edit for Grammar.

CPallini 1-Sep-10 3:35am

This is a recurring question, for instance in the C++ forum. There's no magic: you have to read first line 1 and line 2, in order to read line 3 (unless you know in advance the -byte- position of the latter). The hint is in the name: 'file'.

Sandeep Mewara 1-Sep-10 16:51pm

Avoid using 'Answer me quickly' next time. People here help when they feel like.

3 solutions

Solution 3

Hi Jyotshnad,

Ya its possible.But first you can read full text file and then to get particular line value.

C#

// Namespace
using System.IO;  

    Private string ReadTextFile(int nReadLine)
    {
        // For Example nReadLine =3
        int nCount=0;
        string sOutput=sting.Empty;         
         using (StreamReader sr = new StreamReader("C:\\SampleFile.txt"))
            {
                string line;                                
                while ((line = sr.ReadLine()) != null)
                {
                   nCount++;
                   if(nCount==nReadLine) 
                     sOutput=line; 
                }
            }        
        return sOutput;
     }

I hope this code useful to you.

Cheers :)

Posted 1-Sep-10 1:22am

T.Saravanann

Comments

Kubajzz 2-Sep-10 9:08am

Reason for my vote of 2
Your method is not efficient. There is no need to read the whole file if you read it line-by-line... The following is better:

private string ReadLine(int lineNum) {
int count=0;
using (StreamReader sr = new StreamReader("C:\SampleFile.txt")) {
string line;
while ((line = sr.ReadLine()) != null) {
count++;
if (count == lineNum)
return line;
}
}
return null; // It might be appropriate to throw an exception here...
}

Solution 2

Oh sorry

If you are well familiar with strings and all you can do this by using stream reader

Check this one

http://msdn.microsoft.com/en-us/library/8bh11f1k.aspx[^]

Posted 31-Aug-10 21:31pm

demouser743

Updated 31-Aug-10 21:40pm

v3

Comments

Christian Graus 1-Sep-10 3:32am

Reason for my vote of 1
How does a string builder have anything to do with reading a file ?

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Christian Graus · Accepted Answer · 2010-08-31T21:30:00

Solution 1

Please don't ask the people doing your job for free to 'answer quickly'.

You can use File.ReadAllLines and then choose the index of the line you want.

Posted 31-Aug-10 21:30pm

Christian Graus

Comments

demouser743 1-Sep-10 4:18am

Reason for my vote of 4
Good one