用TextWriterTraceListener实现建议log文件记录

log4net之类3方组件确实很方便，但是想写个小小的demo之类的程序，有点用不起啊。

微软自带的TraceListener要实现一个简易的日志帮助类还是很简单的，直接上代码，自己备用，也希望对同样烦恼的哥们有用：

using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Diagnostics;



namespace TestExpressionLambda

{

    public class Logger

    {

        /// <summary>

        /// 默认路径

        /// </summary>

        public static readonly string RootPath = AppDomain.CurrentDomain.BaseDirectory + "log";



        /// <summary>

        /// 默认文件名格式

        /// </summary>

        public static readonly string FileFormat = DateTime.Now.ToString("yyyy-MM-dd") + ".log";



        /// <summary>

        /// 默认Trace监听

        /// </summary>

        public static TextWriterTraceListener traceListener;



        /// <summary>

        /// 静态实例

        /// </summary>

        private static readonly Logger instance = new Logger();

        static Logger()

        {

            if (!Directory.Exists(RootPath))

            {

                Directory.CreateDirectory(RootPath);

            }



            string logFile = RootPath.TrimEnd('\\') + "\\" + FileFormat;

            //if (!File.Exists(logFile))

            //{

            //    File.Create(logFile);

            //}

            //这里不用create文件，TextWriterTraceListener会自动创建了,谢谢楼下的哥们



            Trace.AutoFlush = true;

            traceListener = new TextWriterTraceListener(logFile);

            Trace.Listeners.Add(traceListener);

        }



        /// <summary>

        /// log输出
　　　　 /// 当然这里可以自己随便扩充

        /// </summary>

        /// <param name="msg"></param>

        public static void Log(string msg)

        {

            Trace.WriteLine(msg);

        }

    }

}