LogHelp 日记分天记录，只记30天日记

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;

namespace Share
{
    public class LogHelp
    {
        private static object Block = new object();
        #region 记录日志
        /// <summary>
        /// 记录日志
        /// </summary>
        /// <param name="msg"></param>
        public static void WriteLog(string msg)
        {

            //string path = @"C:log.txt";
            lock (Block)
            {
                string filename = DateTime.Now.ToString("yyyyMMdd");
                //该日志文件会存在windows服务程序目录下
                string path = AppDomain.CurrentDomain.BaseDirectory + "\Logs\" + filename + ".txt";

                #region 删除前30天的日记
                string sYue = DateTime.Now.AddDays(-30).ToString("yyyyMMdd");
                FileHelp.DeleteFile(AppDomain.CurrentDomain.BaseDirectory + "\Logs\" + sYue + ".txt");
                #endregion
                if (!Directory.Exists(path))//如果不存在，则创建
                {
                    Directory.CreateDirectory(AppDomain.CurrentDomain.BaseDirectory + "\Logs\");
                }


                FileInfo file = new FileInfo(path);
                if (!file.Exists)
                {
                    FileStream fs;
                    fs = File.Create(path);
                    fs.Close();
                }
                else if (file.Length > 30 * 1000 * 1000)
                {
                    file.Delete();
                    FileStream fs;
                    fs = File.Create(path);
                    fs.Close();
                }

                using (FileStream fs = new FileStream(path, FileMode.Append, FileAccess.Write))
                {
                    using (StreamWriter sw = new StreamWriter(fs))
                    {
                        sw.WriteLine(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:ffff") + "   " + msg);
                    }
                }
            }
        }
        public static void WriteLog2(string msg)
        {

            //string path = @"C:log.txt";
            lock (Block)
            {
                //该日志文件会存在windows服务程序目录下
                string path = AppDomain.CurrentDomain.BaseDirectory + "\log.txt";
                FileInfo file = new FileInfo(path);
                if (!file.Exists)
                {
                    FileStream fs;
                    fs = File.Create(path);
                    fs.Close();
                }
                else if (file.Length > 30 * 1000 * 1000)
                {
                    file.Delete();
                    FileStream fs;
                    fs = File.Create(path);
                    fs.Close();
                }

                using (FileStream fs = new FileStream(path, FileMode.Append, FileAccess.Write))
                {
                    using (StreamWriter sw = new StreamWriter(fs))
                    {
                        sw.WriteLine(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:ffff") + "   " + msg);
                    }
                }
            }
        }

        #endregion
    }
}

 改进版，加入线程处理写日记

public class LogHelp
    {
        /// <summary>
        /// 1为写日记，0为不写
        /// </summary>
        private static int LogMode = 1;
        private static object Block = new object();

        /// <summary>
        /// 处理缓存控制器
        /// </summary>
        private static Queue<LogMsg> _HandleCacheCr = new Queue<LogMsg>();

        public static void Init(int logMode)
        {
            LogMode = logMode;
            if (LogMode == 1)
            {
                Thread td = new Thread(WriteLogThread);
                td.Start();
            }
        }

        private static void WriteLogThread()
        {
            while (LogMode == 1)
            {
                WriteLog();
                Thread.Sleep(10);
            }
        }

        private static void WriteLog()
        {
            if (_HandleCacheCr.Count <= 0) return;
            LogMsg logMsg = _HandleCacheCr.Dequeue();
            Write_Log(logMsg.Time.ToString("yyyy-MM-dd HH:mm:ss:ffff") + "   " + logMsg.Msg);
        }

        #region 记录日志
        public static void WriteLog(string msg)
        {
            if (LogMode != 1) return;
            LogMsg logMsg = new LogMsg();
            logMsg.Time = DateTime.Now;
            logMsg.Msg = msg;
            _HandleCacheCr.Enqueue(logMsg);

        }
        /// <summary>
        /// 记录日志
        /// </summary>
        /// <param name="msg"></param>
        private static void Write_Log(string msg)
        {
            
            //string path = @"C:log.txt";
            lock (Block)
            {
                string filename = DateTime.Now.ToString("yyyyMMdd");
                //该日志文件会存在windows服务程序目录下
                string path = AppDomain.CurrentDomain.BaseDirectory + "\Logs\" + filename + ".txt";

                #region 删除前30天的日记
                string sYue = DateTime.Now.AddDays(-30).ToString("yyyyMMdd");
                FileHelp.DeleteFile(AppDomain.CurrentDomain.BaseDirectory + "\Logs\" + sYue + ".txt");
                #endregion
                if (!Directory.Exists(path))//如果不存在，则创建
                {
                    Directory.CreateDirectory(AppDomain.CurrentDomain.BaseDirectory + "\Logs\");
                }


                FileInfo file = new FileInfo(path);
                if (!file.Exists)
                {
                    FileStream fs;
                    fs = File.Create(path);
                    fs.Close();
                }
                else if (file.Length > 30 * 1000 * 1000)
                {
                    file.Delete();
                    FileStream fs;
                    fs = File.Create(path);
                    fs.Close();
                }

                using (FileStream fs = new FileStream(path, FileMode.Append, FileAccess.Write))
                {
                    using (StreamWriter sw = new StreamWriter(fs))
                    {
                        sw.WriteLine( msg);
                    }
                }
            }
        }


        #endregion

        public class LogMsg
        {
            /// <summary>
            /// 写日记的时间
            /// </summary>
            public DateTime Time { get; set; }
            /// <summary>
            /// 信息
            /// </summary>
            public string Msg { get; set; }
        }

    }

作者：三小

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