Configuring log4net TextBoxAppender (custom appender) via Xml file

Question

This is in followup to my question: Flexible Logging Interface...

I now want to write a custom log4net appender for a multiline TextBox, for my WinForms 2.0 applicat

Answer 1

Above sample by Klodoma is quite good. If you change the textbox to a richtextbox, you can do more with the output. Here is some code to color code messages by level:

        System.Drawing.Color text_color;

        switch (loggingEvent.Level.DisplayName.ToUpper())
        {
            case "FATAL":
                text_color = System.Drawing.Color.DarkRed;
                break;

            case "ERROR":
                text_color = System.Drawing.Color.Red;
                break;

            case "WARN":
                text_color = System.Drawing.Color.DarkOrange;
                break;

            case "INFO":
                text_color = System.Drawing.Color.Teal;
                break;

            case "DEBUG":
                text_color = System.Drawing.Color.Green;
                break;

            default:
                text_color = System.Drawing.Color.Black;
                break;
        }

        _TextBox.BeginInvoke((MethodInvoker)delegate
        {
            _TextBox.SelectionColor = text_color;
            _TextBox.AppendText(RenderLoggingEvent(loggingEvent));
        });

If you really want to, the colors could be mapped from the log4net config in the same fashion as the ColorConsoleAppender, but I leave that for the next coder to stumble onto this sample...