Public Enum LogLevels 
   Inherits System.Enum

public enum LogLevels : System.Enum 

LogOutputs output = Log.Config.Output;
try
{
    string messageText = "Warning will robinson, DANGER!";

    Log.Config.SetOutputFormat(LogOutputs.All, "{Message}");
    Log.Config.SetOutputLevel(LogOutputs.All, LogLevels.Info);

    LogLevels newLevel = LogLevels.Warning;
    Assert.AreEqual(LogLevels.Info, Log.Config.SetOutputLevel(LogOutputs.AspNetTrace, newLevel));
    Assert.AreEqual(LogLevels.Info, Log.Config.SetOutputLevel(LogOutputs.TraceWrite, newLevel));
    Assert.AreEqual(LogLevels.Info, Log.Config.SetOutputLevel(LogOutputs.Console, newLevel));
    Assert.AreEqual(LogLevels.Info, Log.Config.SetOutputLevel(LogOutputs.EventLog, newLevel));
    Assert.AreEqual(LogLevels.Info, Log.Config.SetOutputLevel(LogOutputs.LogFile, newLevel));
    Assert.AreEqual(LogLevels.None, Log.Config.SetOutputLevel(LogOutputs.None, newLevel));

    Log.Config.Output = LogOutputs.All & ~LogOutputs.EventLog;

    TextWriter sw = new StringWriter(), orig = Console.Out;
    Console.SetOut(sw);
    string tempFile = Path.GetTempFileName();
    string origLog = Log.Config.LogFile;
    Log.Config.LogFile = tempFile;
    try
    {
        Log.Warning(messageText);
        Log.Info("Hello");
        Log.Verbose("Hello");
    }
    finally
    {
        Console.SetOut(orig);
        Log.Config.LogFile = origLog;
    }

    Assert.AreEqual(messageText, _lastTrace.Substring(GetType().FullName.Length + 2));
    Assert.AreEqual(messageText, sw.ToString().Trim());
    Assert.AreEqual(messageText, File.ReadAllText(tempFile).Trim());
}
finally
{
    Log.Config.Output = output;
    Log.Config.SetOutputLevel(LogOutputs.All, LogLevels.Verbose);
    Log.Config.SetOutputFormat(LogOutputs.All, "[{ManagedThreadId}] {Level} - {FullMessage}");
}

Dim output As LogOutputs = Log.Config.Output
Try
    Dim messageText As String = "Warning will robinson, DANGER!"

    Log.Config.SetOutputFormat(LogOutputs.All, "{Message}")
    Log.Config.SetOutputLevel(LogOutputs.All, LogLevels.Info)

    Dim newLevel As LogLevels = LogLevels.Warning
    Assert.AreEqual(LogLevels.Info, Log.Config.SetOutputLevel(LogOutputs.AspNetTrace, newLevel))
    Assert.AreEqual(LogLevels.Info, Log.Config.SetOutputLevel(LogOutputs.TraceWrite, newLevel))
    Assert.AreEqual(LogLevels.Info, Log.Config.SetOutputLevel(LogOutputs.Console, newLevel))
    Assert.AreEqual(LogLevels.Info, Log.Config.SetOutputLevel(LogOutputs.EventLog, newLevel))
    Assert.AreEqual(LogLevels.Info, Log.Config.SetOutputLevel(LogOutputs.LogFile, newLevel))
    Assert.AreEqual(LogLevels.None, Log.Config.SetOutputLevel(LogOutputs.None, newLevel))

    Log.Config.Output = LogOutputs.All And Not LogOutputs.EventLog

    Dim sw As TextWriter = New StringWriter(), orig As TextWriter = Console.Out
    Console.SetOut(sw)
    Dim tempFile As String = Path.GetTempFileName()
    Dim origLog As String = Log.Config.LogFile
    Log.Config.LogFile = tempFile
    Try
        Log.Warning(messageText)
        Log.Info("Hello")
        Log.Verbose("Hello")
    Finally
        Console.SetOut(orig)
        Log.Config.LogFile = origLog
    End Try

    Assert.AreEqual(messageText, _lastTrace.Substring([GetType]().FullName.Length + 2))
    Assert.AreEqual(messageText, sw.ToString().Trim())
    Assert.AreEqual(messageText, File.ReadAllText(tempFile).Trim())
Finally
    Log.Config.Output = output
    Log.Config.SetOutputLevel(LogOutputs.All, LogLevels.Verbose)
    Log.Config.SetOutputFormat(LogOutputs.All, "[{ManagedThreadId}] {Level} - {FullMessage}")
End Try