wcs/WCS/Log/Log.cs

using System;
using System.Collections.Concurrent; 
using System.IO; 
using System.Threading.Tasks;

namespace WCS
{
    public class Log
    {
        private static Log _log = new Log();
        public static Log Instance { get { return _log; } }
        LogDefaultList item = new LogDefaultList();
        string Path = AppDomain.CurrentDomain.BaseDirectory + "webApiLog";
        ConcurrentQueue<LogDefaultList> qs = new ConcurrentQueue<LogDefaultList>();
        System.IO.StreamWriter streamWriter;
   
        public Log()
        {
            if (!System.IO.Directory.Exists(Path))
            {
                Directory.CreateDirectory(Path);
            }
            ThreadWrite();
        }
         
        public void WriteLogAdd(string msg, string path=null)
        {
            qs.Enqueue(new LogDefaultList() { msg = msg, path = path });
        }
        public delegate void DelShowLog(string msg);
        public event DelShowLog EveShowLog;
        private void WriteLog(string msg, string path)
        {
            if (string.IsNullOrEmpty(path))
            {
                path = DateTime.Now.ToString("yyyy-MM-dd");
            }
            else
            {
                path = path +" "+ DateTime.Now.ToString("yyyy-MM-dd");
            }
            streamWriter = new System.IO.StreamWriter(Path + "\\" + path + ".txt", true);
            streamWriter.WriteLine(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss fff") + "-->>>" + msg);
            streamWriter.Close();
            this.EveShowLog?.Invoke(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss fff") + "-->>>" + msg);
        }
        private void ThreadWrite()
        {
            Task.Factory.StartNew(() =>
            {

                while (true)
                {
                    System.Threading.Thread.Sleep(20);
                    if (qs.Count > 0)
                    {
                        if (qs.TryDequeue(out item))
                        {
                            WriteLog(item.msg, item.path);
                        }
                    }
                }
            });
        }

    }

    public class LogDefaultList
    {
        public string path { get; set; }
      
        public string msg { get; set; }
    }
}