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

I modified the appender to work with multithreading. Also, I attached the code configuration.

Regards, Dorin

Appender:

public class TextBoxAppender : AppenderSkeleton
{
    private TextBox _textBox;
    public TextBox AppenderTextBox
    {
        get
        {
            return _textBox;
        }
        set
        {
            _textBox = value;
        }
    }
    public string FormName { get; set; }
    public string TextBoxName { get; set; }

    private Control FindControlRecursive(Control root, string textBoxName)
    {
        if (root.Name == textBoxName) return root;
        foreach (Control c in root.Controls)
        {
            Control t = FindControlRecursive(c, textBoxName);
            if (t != null) return t;
        }
        return null;
    }

    protected override void Append(log4net.Core.LoggingEvent loggingEvent)
    {
        if (_textBox == null)
        {
            if (String.IsNullOrEmpty(FormName) ||
                String.IsNullOrEmpty(TextBoxName))
                return;

            Form form = Application.OpenForms[FormName];
            if (form == null)
                return;

            _textBox = (TextBox)FindControlRecursive(form, TextBoxName);
            if (_textBox == null)
                return;

            form.FormClosing += (s, e) => _textBox = null;
        }
        _textBox.Invoke((MethodInvoker)delegate
        {
            _textBox.AppendText(loggingEvent.RenderedMessage + Environment.NewLine);
        });
    }
}

Configuration:

           var textBoxAppender = new Util.TextBoxAppender();
        textBoxAppender.TextBoxName = "textLog";
        textBoxAppender.FormName = "MainTarget";
        textBoxAppender.Threshold = log4net.Core.Level.All;
        var consoleAppender = new log4net.Appender.ConsoleAppender { Layout = new log4net.Layout.SimpleLayout() };
        var list = new AppenderSkeleton[] { textBoxAppender, consoleAppender };
        log4net.Config.BasicConfigurator.Configure(list);