Question

When I create my log.txt with File.Create(Path.Combine(PATH, NAME)); and then try to read from it I get an exception: {System.IO.IOException: The process cannot access the file 'c:\temp\log.txt' because it is being used by another process..

If the log.txt file exits and not created in the method I can read and write to the log wihtout any problems.

Is the log.txt created async and the problem is that the program is trying to read it before it’s created?

public static void WriteToLog(string text)
{
    try
    {
        if (!Directory.Exists(PATH))
        {
            Directory.CreateDirectory(PATH);
        }

        if( !File.Exists(Path.Combine(PATH, NAME)) )
        {
            File.Create(Path.Combine(PATH, NAME));
        }

        var logLines = File.ReadAllLines(Path.Combine(PATH, NAME)).ToList<string>();
        logLines.Insert(0, "-------------------------------------------------End New Log");
        logLines.Insert(0, text);
        logLines.Insert(0, "-------------------------------------------------Start New Log");
        File.WriteAllLines(Path.Combine(PATH, NAME), logLines);
    }
    catch (Exception ex)
    {
    }
}

Answer 1

File.Create creates a filestream, which is open after the creation. so the file is used by its own process.

just change it to

        using(var f = File.Create(Path.Combine(PATH, NAME))) { } ;