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C#” How to read text file without locking it, so other application could write in it.

Posted on 2013-06-11
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Last Modified: 2013-06-11
Dear experts

I wrote a Windows Form Application which should read a log text file, while it is being written from other application ¿ This other application in every 10-100 sec. add a row to this text file. I have no idea what access mode this other application use with the file, but I guess it open the file with add mode, wrote new lines info and then close the file open pointer. It is on C++ or Deplhi

 So I’m wondering what is my best tactics? I guess it is better I to read all the file at once, to close it and then to start cycle between its line and add my logic.

 Or it will be better first to copy the file on other direction on HDD and then to read this copied file?

 The text file I should read is with 200-2000 lines, not so good as every day it create a new one.

Second question – I plan to use StreamReader , this is the right choice? I need .NET library which read the text files without being locked it at all. I wrote in my DB which is the last row I have been read, so my only problem is to NOT block the other application access.
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Question by:dvplayltd
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sedgwick earned 500 total points
ID: 39236932
since u need the last lines written to the file u might want to check ReverseLineReader implementation here:
http://stackoverflow.com/questions/452902/how-to-read-a-text-file-reversely-with-iterator-in-c-sharp
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Expert Comment

by:Minh Võ Công
ID: 39236987
using (var fileStream = new FileStream("foo.bar", FileMode.Open, FileAccess.Read, FileShare.ReadWrite)
using (var textReader = new StreamReader(fileStream))
{
    var content = textReader.ReadToEnd();
}

http://stackoverflow.com/questions/3448230/how-can-i-read-a-text-file-without-locking-it
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LVL 44

Expert Comment

by:AndyAinscow
ID: 39237028
Have you actually tried to read it?  If it is failing maybe it is the other app attempts to use an exclusive access to the file - which means the other app is coded so what you want would never work.
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by:dvplayltd
ID: 39237234
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