分天记录日记类

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");
                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
    public static void DeleteFile(string path)
        {
            if (File.Exists(path))//判断文件是不是存在
            {
                File.Delete(path);//如果存在则删除
            }
        }
    }