[dor343232]

i have probelm if i run my multi Thread to write file i get 2 type of errorr

run like 50 Thread or 500 same Problem.

Thread myNewThread = new Thread(() => Start(lines));
myNewThread.Start();

1) System.IO.IOException: The process cannot access the file

2) is write 2 - 5 times the same line ..


how can i fix it 🤝 🤝 🤝

[Eternal Darkness]

i have probelm if i run my multi Thread to write file i get 2 type of errorr

run like 50 Thread or 500 same Problem.

Thread myNewThread = new Thread(() => Start(lines));
myNewThread.Start();

1) System.IO.IOException: The process cannot access the file

2) is write 2 - 5 times the same line ..


how can i fix it  🤝  🤝  🤝

Locking. (Perhaps some more good documentation: readerwriterlock)
Cannot write to a file with more than one operation at a time. Need to make sure that you only write to the file when you have access to the "locked door" (file is not currently being written to in another thread, in this instance).

What may be simpler/easier is to add the output to some Data Structure (Think: List, Array, Queue, etc) and output to file in a single write instead.

Examples with locks:
https://www.codeproject.com/Tips/1190802...nvironment
https://codereview.stackexchange.com/a/49161

[dor343232]

Locking. (Perhaps some more good documentation: readerwriterlock)
Cannot write to a file with more than one operation at a time. Need to make sure that you only write to the file when you have access to the "locked door" (file is not currently being written to in another thread, in this instance).

What may be simpler/easier is to add the output to some Data Structure (Think: List, Array, Queue, etc) and output to file in a single write instead.

Examples with locks:
File Locking in a Multi Threaded Environment - CodeProject
c# - Writing to file in a thread safe manner - Code Review Stack Exchange

i am stell new in C# any more Exemple ??

like more easy ?

[Eternal Darkness]

i am stell new in C# any more Exemple ??

like more easy ?

Code

private object locker = new Object();
public void WriteToFile(String path, String text) {
    lock (locker) {
        System.IO.File.AppendAllText(path, text); //https://docs.microsoft.com/en-us/dotnet/api/system.io.file.appendalltext?view=netframework-4.8
    }
}

call: WriteToFile(@"C:\...\whateverfile.txt", variable);

"Easy" (version of), no error handling/etc (definitely wanted).

[dor343232]

Code

private object locker = new Object();
public void WriteToFile(String path, String text) {
lock (locker) {
System.IO.File.AppendAllText(path, text); //[url=https://#/a8n]File.AppendAllText Method (System.IO) | Microsoft Docs[/url]
}
}

call: WriteToFile(@"C:\...\whateverfile.txt", variable);

"Easy" (version of), no _error_ handling/etc (definitely wanted).

Got errorr

Thread myNewThread = new Thread(() => Start(ArrayLines));
myNewThread.Start();


An object reference is required for the non-static field, method, or property 'Program.StartBrut(string[])

[Eternal Darkness]

Got errorr

Thread myNewThread = new Thread(() => Start(ArrayLines));
myNewThread.Start();


An object reference is required for the non-static field, method, or property 'Program.StartBrut(string[])

Got it to work in a min.

I assume ArrayLines is inaccessible (at wherever you are starting this thread)?
private object locker is a global variable meaning it is outside of any functions/methods (voids). Not sure how it could be my code, other than the global var being misplaced/something...
Want to post your code? Can tell what it is based off method name.
Btw, ideally you should start a thread like: https://stackoverflow.com/a/3360586 (Needs to be object parameter). (Relatively Small Difference)

[dor343232]

Got it to work in a min.

I assume ArrayLines is inaccessible (at wherever you are starting this thread)?
private object locker is a global variable meaning it is outside of any functions/methods (voids). Not sure how it could be my code, other than the global var being misplaced/something...
Want to post your code? Can tell what it is based off method name.
Btw, ideally you should start a thread like: c# - How to pass parameters to ThreadStart method in Thread? - Stack Overflow (Needs to be object parameter). (Relatively Small Difference)

THX !