VS_FileSendTool/FS/FileSend/Log.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace FileSend
{
    internal class MLog
    {
        StringBuilder sb;

        public MLog()
        {
            sb = new StringBuilder();
        }

        public string Debug(object msg)
        {
            var s = msg.ToString();
            sb.AppendLine($"debug: {s}");
            return s;
        }

        public string Waring(object msg)
        {
            var s = msg.ToString();
            sb.AppendLine($"waring: {s}");
            return s;
        }

        public string Error(object msg)
        {
            var s = msg.ToString();
            sb.AppendLine($"error: {s}");
            return s;
        }
    }

    internal static class Log
    {
        static MLog mLog = new MLog();
        public static Action<string> LogEvent;

        public static void Debug(object msg)
        {
            LogEvent?.Invoke(mLog.Debug(msg));
        }

        public static void Waring(object msg)
        {
            LogEvent?.Invoke(mLog.Waring(msg));
        }

        public static void Error(object msg)
        {
            LogEvent?.Invoke(mLog.Error(msg));
        }
    }
}