private static readonly object _LockObject = new object();         private static Random _Random = new Random();        private static DateTime _LastDeleteTime = DateTime.Now;       //文件夹名称 _FilePath=@"Logs"    文件名  _FileName,         public static void WriteLog(string _FilePath, string _FileName, string _Msg)        {            lock (_LockObject)            {                try                {                    var _Path = AppDomain.CurrentDomain.BaseDirectory + _FilePath + @"\";                    if (!Directory.Exists(_Path))                    {                        Directory.CreateDirectory(_Path);                    }                    _FileName = _FileName + "_" + DateTime.Now.ToString("yyyy-MM-dd") + ".txt";if (_Random.Next(10) >= 9 && File.Exists(_Path + _FileName))                    {                        FileInfo fileInfo = new FileInfo(_Path + _FileName);                        if (fileInfo.Length > 10485760)//10M                        {                            fileInfo.MoveTo(_Path + _FileName.Replace(".", string.Format("_{0}.", DateTime.Now.ToString("HHmmss"))));                        }                    }                    System.IO.StreamWriter _Writer = new System.IO.StreamWriter                         (                            _Path + _FileName,                            true,                            System.Text.Encoding.Default                         );                    _Writer.WriteLine(string.Concat("[", DateTime.Now.ToString("HH:mm:ss"), "]  ", _Msg, "\n\n"));                    _Writer.Close();//  删除超过15天的日志                    if ((DateTime.Now.Day != _LastDeleteTime.Day))                    {                        _LastDeleteTime = DateTime.Now;                        var files = Directory.GetFiles(_Path);                        foreach (var file in files.Where(t => t.EndsWith(".txt")))                        {                            var fileInfo = new FileInfo(file);                            if (!IsRealMatch(fileInfo.Name.ToLower(), "_[0-9]{4}[-][0-9]{2}[-][0-9]{2}[^.]{0,20}[.]txt"))                            {                                continue;                            }                            if ((DateTime.Now - fileInfo.LastWriteTime).TotalDays > 15)                            {                                File.Delete(file);                            }                        }                    }                                   }catch                 { }            }        }public static bool IsRealMatch(string inputInfo, string strInfo)        {            return IsMatch(inputInfo, strInfo, RegexOptions.IgnoreCase | RegexOptions.Singleline);        } public static bool IsMatch(string inputInfo, string strInfo, RegexOptions options)        {            return Regex.IsMatch(inputInfo, strInfo, options);        }