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Get C# File "Stream Reader" Last Line

Posted on 2012-03-30
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Last Modified: 2012-06-21
Hi ,
I need To Get The Last Line Only From A massive 10GB Text File  
Any Help Will Be Accepted And Thanks In Advance For The Effort
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Question by:AhmedHindy
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7 Comments
 
LVL 9

Expert Comment

by:OCDan
ID: 37789487
String whatever= new String;
while !(EOF)
{
  whatever = readline code here
}
0
 
LVL 75

Expert Comment

by:käµfm³d 👽
ID: 37789492
Like this?

string lastLine = string.Empty;

using (System.IO.StreamReader reader = new System.IO.StreamReader("c:\\some\\path\\to\\file.txt"))
{
    while (!reader.EndOfStream)
    {
        lastLine = reader.ReadLine();
    }
}

// lastLine is now populate with last line of file or an empty string if no lines were read.

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0
 
LVL 27

Accepted Solution

by:
Chinmay Patel earned 300 total points
ID: 37789590
Hi AhmedHindy,

I would not recommend reading the file forward till the end and then read the last line.

I see there are two alternatives here
1. Use Tail for Windows - and using Process.Start you launch the application and get the results.
2. First seek to the end of the file and then read backwards till you hit a new line.

This file has fixed length lines?

Regards,
Chinmay.
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LVL 4

Author Comment

by:AhmedHindy
ID: 37789592
Hi , Thanks For The Fast Answers But ,
My Main Problem is The File Length about 10 GB I need Some Fast Algorithm To Get Last Line Only Directly Or Almost Directly To Save Time
0
 
LVL 27

Expert Comment

by:Chinmay Patel
ID: 37789599
Kindly note the URL for tail for the windows : http://sourceforge.net/projects/tailforwin32/

I posted the URL but it wouldn't work and I was editing my answer when you commented your last post :)

Kindly let me know if this file has fixed lenght lines or not?
0
 
LVL 86

Expert Comment

by:Mike Tomlinson
ID: 37789627
Right...if the file does NOT have fixed width lines (as Chinmay_Patel has asked) then you have to read byte by byte backwards from the end of the file until you find your carriage return/line feed combination.

See: http://stackoverflow.com/questions/398378/get-last-10-lines-of-very-large-text-file-10gb-c-sharp
0
 
LVL 4

Author Comment

by:AhmedHindy
ID: 37790634
First Thanks For All Responses ,
Second  Unfortunately File Has No Fixed Length
And I Will Try To Read The File Backward
Thanks Again For The Effort
0

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