Question

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The file is being used by another process, I must close it? How?

I’m not sure why is that but I cannot write some data into text file. I am doing like so:

    private void CreateLastOpenFile()
    {
        if (!Directory.Exists(directory))
        {
            Directory.CreateDirectory(directory);
        }

        if (!File.Exists(file))
        {
            FileStream newFile = File.Create(file);
            newFile.Close();
        }

        using (StreamWriter lastOpenedFile = new StreamWriter(file))
        {
            lastOpenedFile.WriteLine(filePath);
        }
    }

Am I doing this correctly?Should I be checking if directory exists? If file exists? What’s the proper way? I was using examples from MSDN but I’m not sure how to do this.

Answer 1

I’d rather do:

String p = Path.GetDirectoryName(fileName);
if (!Directory.Exists(p))
{
    Directory.CreateDirectory(p);
}

FileStream stream = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.Write);
using (StreamWriter writer = new StreamWriter(stream))
{
    ...
    writer.Flush();
}

This creates a new file if it doesn’t exist.

using automatically calls Dispose on the writer, which in turn calls Close, which closes both writer and the underlying stream.