ln.logging/LoggingBackend.cs

using System;
namespace ln.logging
{
    public abstract class LoggingBackend : ILoggingBackend
    {
        public LogLevel MinLogLevel { get; set; } = LogLevel.FATAL;
        public LogLevel MaxLogLevel { get; set; } = LogLevel.MAX;

        public LoggingBackend()
        {
        }

        public void Message(LogLevel logLevel, string[] lines)
        {
            if ((logLevel >= MinLogLevel) && (logLevel <= MaxLogLevel))
                MessageReceived(logLevel, lines);
        }

        protected abstract void MessageReceived(LogLevel logLevel, String[] lines);
    }
}