CODEWITHSUNDEEP
c#filerace-conditionstreamwriter
Jessica
Jessica

Reputation: 2051

C# cannot access file immediately after creating it

I have a scenario where I need to check if a txt file exists, if it doesn't I need to create it.

Immediately after this, I need to populate the file with some text.

This is what my code looks like:

if (!File.Exists(_filePath))
{
    File.Create(_filePath);
}

using (var streamWriter = File.AppendText(_filePath))
{
    //Write to file
}

I receive an exception (System.IO.IOException) on line 5, only when a new file has to be created. Here is the exception:

The process cannot access the file '**redacted file path**' because it is being used by another process.

I don't want to add something like Thread.Sleep(1000);, as that is an awful solution.

Is there a way to find out when the file is free again, so that I can write to it?

Upvotes: 4

Views: 2135

Answers (3)

Dr hema
Dr hema

Reputation: 51

FileCreate method return Filestream which should be closed before using StreamWriter

if (!File.Exists(_filePath))
{
// close fileStream
    File.Create(_filePath).Close();
}

using (var streamWriter = File.AppendText(_filePath))
{
    //Write to file
}

Upvotes: 5

Lana
Lana

Reputation: 1046

Just use StreamWriter with param append = true. It'll create the file if needed.

using (StreamWriter sw = new StreamWriter(_filePath, true, Encoding.Default))
{
   sw.WriteLine("blablabla");
}

Upvotes: 6

Johnny
Johnny

Reputation: 9519

You were so close, just remove the first if, the File.AppendText will do the trick for you and create file if not there.

using (var streamWriter = File.AppendText(_filePath))
{
    //write to file
}

Upvotes: 4

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