File.WriteAllText and Concurrent Accesses

Question

Suppose I\'m writing a very long string to a file using File.WriteAllText, and another thread or process is trying to read the same file. Would it throw any exception? In ot

Answer 1

This is the source code from .net Framework 4.0. clearly StreamWriter is used that Uses FileShare.Read Internally.

    [SecuritySafeCritical]
public static void WriteAllText(string path, string contents)
{
    if (path == null)
    {
        throw new ArgumentNullException("path");
    }
    if (path.Length == 0)
    {
        throw new ArgumentException(Environment.GetResourceString("Argument_EmptyPath"));
    }
    InternalWriteAllText(path, contents, StreamWriter.UTF8NoBOM);
}


private static void InternalWriteAllText(string path, string contents, Encoding encoding)
{
    using (StreamWriter writer = new StreamWriter(path, false, encoding))
    {
        writer.Write(contents);
    }
}

This is the code that creates the underlying stream for StreamWriter.

private static Stream CreateFile(string path, bool append)
{
    return new FileStream(path, append ? FileMode.Append : FileMode.Create, FileAccess.Write, FileShare.Read, 0x1000, FileOptions.SequentialScan);
}