ConsoleCustomWriter.cs

using System;
using System.Threading;
using System.Threading.Tasks;
using Waher.Events;
using Waher.Runtime.Queue;
 
namespace Waher.Runtime.Console.Worker
{
    public abstract class ConsoleCustomWriter : WorkItem
    {
        private readonly ConsoleColor? foregroundColor;
        private readonly ConsoleColor? backgroundColor;
 
        public ConsoleCustomWriter(ConsoleColor? ForegroundColor, ConsoleColor? BackgroundColor)
        {
            this.foregroundColor = ForegroundColor;
            this.backgroundColor = BackgroundColor;
        }
 
        public override sealed async Task Execute(CancellationToken Cancel)
        {
            try
            {
                ConsoleColor FgBak = System.Console.ForegroundColor;
                ConsoleColor BgBak = System.Console.BackgroundColor;
 
                if (this.foregroundColor.HasValue)
                    System.Console.ForegroundColor = this.foregroundColor.Value;
 
                if (this.backgroundColor.HasValue)
                    System.Console.BackgroundColor = this.backgroundColor.Value;
 
                await this.DoWrite();
 
                System.Console.ForegroundColor = FgBak;
                System.Console.BackgroundColor = BgBak;
            }
            catch (Exception ex)
            {
                Log.Exception(ex);
            }
        }
 
        protected abstract Task DoWrite();
 
    }
}