File.Create Async write keeps the file locked

Question

I need to write a file in a async way, every half a second. And I can only use C# on .Net Framework 2.0 .

I tried using File.Create and BeginWrite. But it keeps the file locked, and I need to be able to access it (read). I tried fiddling with the security settings but I'm not really sure what I'm doing there.

Any help is appreciated!

Edit:

var bytes = Encoding.ASCII.GetBytes(stringBuilder.ToString());
var filePath = Path.Combine(OUTPUT_FOLDER, FILE_NAME);
var fileSteam = File.Create(filePath, bytes.Length, FileOptions.Asynchronous);
m_IAsyncResult = fileSteam.BeginWrite(bytes, 0, int.MaxValue, WriteCallback, new State(fileSteam));

private void WriteCallback(IAsyncResult ar) {
    var state = (State)ar.AsyncState;
    var stream = state.Stream;
    stream.EndWrite(ar);

    m_IAsyncResult = null;
}

We need to see your code, but that is generally indicative that you aren't closing a stream somewhere. — vcsjones, Jun 03 '15 at 17:40
What code are you using to read it? I assume BeingRead? https://msdn.microsoft.com/en-us/library/system.io.stream.beginread(v=vs.80).aspx — William Xifaras, Jun 03 '15 at 18:11
@WilliamXifaras I'm reading it with windows open or copy, not with code (yet) — Arie Barsky, Jun 03 '15 at 19:55
Did you try using a thread and synchronous IO? That is much easier on .NET 2.0. — usr, Jun 04 '15 at 09:33

score 2 · Answer 1 · edited May 23 '17 at 11:58

2

You need to make sure that the file is opened non-exclusively. Check this post How can I read a text file without locking it?

edited May 23 '17 at 11:58

Community

1
1

answered Jun 03 '15 at 17:43

Steven

43
4

Hey, I was trying to open it or copy it with windows, not with code – Arie Barsky Jun 03 '15 at 19:48

score 0 · Answer 2 · answered Jun 03 '15 at 18:40

0

If you can use File.WriteAllText or File.AppendAllText both will handle the open and close for you allowing you to read again later without issue.

answered Jun 03 '15 at 18:40

JStevens

2,090
1
22
26

File.Create Async write keeps the file locked

2 Answers2