.NET 2.0 : File.AppendAllText(…) - Thread safe implementation

Question

As an exercise in idle curiosity more than anything else, consider the following simple logging class:

internal static class Logging
{
    private static object          


        

Answer 1

Testing parallel writes shows that you would get a System.IO.IOException if you were to comment out your lock statement.

[Test]
public void Answer_Question()
{
    var ex = Assert.Throws(() => Parallel.Invoke(
        () => Logging.WriteLog("abc"),
        () => Logging.WriteLog("123")
    ));

    // System.IO.IOException: The process cannot access the file 'C:\Logs\thread-safety-test.txt' because it is being used by another process.
    Console.Write(ex);
}