voile/Voile/DockContents/DockLog.cs

using log4net.Appender;
using log4net.Core;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using WeifenLuo.WinFormsUI.Docking;

namespace Voile.DockContents
{
    public partial class DockLog : DockContent, IAppender
    {
        private static readonly log4net.ILog logger = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
        public DockLog()
        {
            InitializeComponent();

            richTextBox1.AllowDrop = true;
            richTextBox1.DragEnter += RichTextBox1_DragEnter;
            richTextBox1.DragDrop += RichTextBox1_DragDrop;
        }

        public void Logger(string s)
        {
            richTextBox1.SuspendLayout();
            richTextBox1.AppendText(s + Environment.NewLine);
            richTextBox1.SelectionStart = richTextBox1.Text.Length;
            richTextBox1.ScrollToCaret();
            richTextBox1.ResumeLayout();
        }

        private void RichTextBox1_DragDrop(object? sender, DragEventArgs e)
        {
        }

        private void RichTextBox1_DragEnter(object? sender, DragEventArgs e)
        {
        }

        bool wasInitalized;
        public void InitalizeLogging()
        {
            if (wasInitalized)
                throw new Exception("already initalized");

            var hierarchy = (log4net.Repository.Hierarchy.Hierarchy)log4net.LogManager.GetRepository();
            hierarchy.Root.AddAppender(this);
            hierarchy.Root.Level = log4net.Core.Level.All;
            log4net.Config.BasicConfigurator.Configure(hierarchy);
            wasInitalized = true;
        }

        private log4net.Layout.PatternLayout logLayout;
        public void DoAppend(LoggingEvent loggingEvent)
        {
            if (logLayout == null)
            {
                logLayout = new log4net.Layout.PatternLayout();
                logLayout.ConversionPattern = "%date %level %logger - %message";
                logLayout.ActivateOptions();
            }
            string v = logLayout.Format(loggingEvent);
            Logger(v);
        }
    }
}