C# The process cannot access the file ''' because it is being used by another process

Question

The snippet of code was just supposed to write a string into a text file called \"all_results.txt\". I had errors implementing in File.WriteAllText. After searching the net

Answer 1

I found the post while I had similar problem. The given advises gave me an idea! So for this purpose I wrote the following method

public static void ExecuteWithFailOver(Action toDo, string fileName)
{

    for (var i = 1; i <= MaxAttempts; i++)
    {
        try
        {
            toDo();

            return;
        }
        catch (IOException ex)
        {
            Logger.Warn("File IO operation is failed. (File name: {0}, Reason: {1})", fileName, ex.Message);
            Logger.Warn("Repeat in {0} milliseconds.", i * 500);

            if (i < MaxAttempts)
                Thread.Sleep(500 * i);
        }
    }

    throw new IOException(string.Format(CultureInfo.InvariantCulture,
                                        "Failed to process file. (File name: {0})",
                                        fileName));

}

then I used the method in the following way

    Action toDo = () =>
                   {
                       if (File.Exists(fileName))
                           File.SetAttributes(fileName, FileAttributes.Normal);

                       File.WriteAllText(
                           fileName,
                           content,
                           Encoding.UTF8
                           );
                   };

    ExecuteWithFailOver(toDo, fileName);

Later analyzing the logs I have discovered that the reason of my troubles was an attempt to act against the same file from the parallel threads. But I still see some pro-s in using the suggested FailOver method