tbf/AppDiagnostic/LogColorRule.cs

using System;
using System.Collections.Generic;
using System.Drawing;

namespace AppDiagnostic
{
    [Serializable]
    public sealed class LogColorRule
    {
        public bool Enabled { get; set; } = true;
        public string Pattern { get; set; } = string.Empty;
        public int ForeColorArgb { get; set; } = Color.Black.ToArgb();
        public int BackColorArgb { get; set; }
        public bool UseBackColor { get; set; }
        public bool Bold { get; set; }

        public Color ForeColor => Color.FromArgb(ForeColorArgb);
        public Color BackColor => Color.FromArgb(BackColorArgb);

        public LogColorRule Clone()
        {
            return new LogColorRule
            {
                Enabled = Enabled,
                Pattern = Pattern,
                ForeColorArgb = ForeColorArgb,
                BackColorArgb = BackColorArgb,
                UseBackColor = UseBackColor,
                Bold = Bold
            };
        }

        public override string ToString()
        {
            string state = Enabled ? string.Empty : "[disabled] ";
            return state + Pattern;
        }

        public static List<LogColorRule> CreateDefaults()
        {
            return new List<LogColorRule>
            {
                Create("|TRACE|", Color.DimGray, false),
                Create("|DEBUG|", Color.RoyalBlue, false),
                Create("|INFO |", Color.ForestGreen, false),
                Create("|WARN |", Color.DarkOrange, true),
                Create("|ERROR|", Color.Crimson, true),
                Create("|FATAL|", Color.White, true, Color.DarkRed)
            };
        }

        private static LogColorRule Create(string pattern, Color foreground, bool bold, Color? background = null)
        {
            return new LogColorRule
            {
                Enabled = true,
                Pattern = pattern,
                ForeColorArgb = foreground.ToArgb(),
                BackColorArgb = background?.ToArgb() ?? Color.Empty.ToArgb(),
                UseBackColor = background.HasValue,
                Bold = bold
            };
        }
    }
}