Remove duplicate lines in a file that is being used by another thread
Clash Royale CLAN TAG#URR8PPP
Remove duplicate lines in a file that is being used by another thread
I have a file called example.txt and I want to remove the duplicate lines in this file using my C# application.
example.txt
My application is multi-threaded, and more than one thread are already accessing the file example.txt
example.txt
I've tried a lot of methods but all of them returns the error:
The file 0 is already being used by another process.
lock ()
@FrankerZ - I've tried
lock(locker) File.WriteAllLines(filepath, File.ReadLines(filepath) .Where(line => previousLines.Add(line))); but it is giving the same problem.– MatrixCow08
Aug 8 at 7:52
lock(locker) File.WriteAllLines(filepath, File.ReadLines(filepath) .Where(line => previousLines.Add(line)));
Add a
.ToArray() after the .Where().– FrankerZ
Aug 8 at 8:03
.ToArray()
.Where()
@FrankerZ -
File.ReadLines(filepath).Where().ToArray that can't work– MatrixCow08
Aug 8 at 8:11
File.ReadLines(filepath).Where().ToArray
Ok, I got it to work but still the same results :/
– MatrixCow08
Aug 8 at 8:13
1 Answer
1
You should be able to do this by specifying file share in your file stream
FileStream s2 = new FileStream(name, FileMode.Open, FileAccess.Read, FileShare.Read);
https://msdn.microsoft.com/en-us/library/system.io.fileshare(v=vs.110).aspx
How can this be threads-safe?
– MatrixCow08
Aug 8 at 7:57
It allows you to open file by another process, you still need to implement locking mechanism
– sziszu
Aug 8 at 8:00
But why did you make it
FileStream s2, why not New FileStream so it can be called immediately on a method?– MatrixCow08
Aug 8 at 8:01
FileStream s2
New FileStream
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If the file is in use by another thread, there isn't much you can do. Attempting to read/write by multiple threads at the same time would cause data corruption. I'd implement a
lock ()mechanism.– FrankerZ
Aug 8 at 7:30