C#自定义log机制

在写一些后台处理的时候，通常出现一些异常问题我们都是通过输出一些log来提示用户，这样可以大大方便程序的调试和维护，

本例采用的是队列（Queue）来推送log，在一个单独的线程里面执行log输出，具体代码如下：

 /// <summary>    /// 程序日志输出工具类    /// </summary>    class Logger    {        /// <summary>        /// log所在目录        /// </summary>        private const String LOG_DIR = "D:\\log";        /// <summary>        /// log全路径        /// </summary>        private const String LOG_PATH = "D:\\log\\{0}.log";        /// <summary>        /// log队列        /// </summary>        private static Queue<Log> logs = new Queue<Log>();        /// <summary>        /// 线程启停标示        /// </summary>        private static Boolean isSaving = false;        /// <summary>        /// 输出log的线程        /// </summary>        private static Thread saveThread;        /// <summary>        /// log线程触发器        /// </summary>        public static EventWaitHandle _wh = new AutoResetEvent(false);        /// <summary>        /// 日志类型        /// </summary>        public struct LogType        {            public static String ERROR { get { return "错误"; } }            public static String WARnING { get { return "警告"; } }            public static String INFO { get { return "信息"; } }        }        /// <summary>        /// 启动log输出        /// </summary>        public static void Start()        {            try            {                isSaving = true;                saveThread = new Thread(save);                saveThread.IsBackground = true;                saveThread.Start();            }            catch (Exception e)            {                           }        }        /// <summary>        /// 停止log输出        /// </summary>        public void Stop()        {            try            {                _wh.Close();            }            catch (Exception e)            {                           }        }        /// <summary>        /// 输出LOG        /// </summary>        private static void save()        {            while (true)            {                if (!isSaving)                    break;                try                {                    Log log = null;                    lock (logs.GetType())                        if (logs.Count > 0)                        {                            //移除并返回队列的第一个对象                            log = logs.Dequeue();                            if (log == null) return;                        }                    if (log != null)                    {                        StreamWriter sw = null;                        String logStr;                        String today = log.now.ToString("yyyy-MM-dd");                        try                        {                            if (!Directory.Exists(LOG_DIR))                            {                                Directory.CreateDirectory(LOG_DIR);                            }                            //创建输出流                            if (!File.Exists(String.Format(LOG_PATH, today)))                            {                                File.Create(String.Format(LOG_PATH, today)).Close();                            }                            sw = new StreamWriter(String.Format(LOG_PATH, today), true);                            //输出log日期                            logStr = "时间：" + DateTime.Now.ToLocalTime().ToString();                            sw.WriteLine(logStr);                            //输出log日期                            logStr = "区域：" + log.logPlace;                            sw.WriteLine(logStr);                            //输出log类型                            logStr = "类型：" + log.logType;                            sw.WriteLine(logStr);                            if (log.ex != null)                            {                                //输出log日期                                logStr = "信息：" + log.ex.Message;                                logStr += Environment.NewLine + log.ex.StackTrace;                                                            }                            else {                                //输出log日期                                logStr = "信息：" + log.message;                            }                                                       sw.WriteLine(logStr);                            //输出log结束标记                            logStr = "------------------------------------------------------------------------------------------------------------------";                            sw.WriteLine(logStr);                        }                        catch                        {                            //do nothing                        }                        finally                        {                            if (sw != null)                            {                                sw.Close();                            }                        }                    }                    else                    {                        //当队列里面没有需要保存到数据库里面的内容时，线程进入等待状态                        //直到_wh调用set(),线程才继续执行                                              _wh.WaitOne();                    }                }                catch (Exception e)                {                    //do nothing                }            }        }        /// <summary>        /// 推送log        /// </summary>        /// <param name="log"></param>        public static void push(Log log)        {            logs.Enqueue(log);            _wh.Set();        }    }    /// <summary>    /// log实体类    /// </summary>    class Log    {        /// <summary>        /// log类型        /// </summary>        public String logType;        /// <summary>        /// log发生位置        /// </summary>        public String logPlace;        /// <summary>        /// log信息        /// </summary>        public String message;        /// <summary>        /// log发生时间        /// </summary>        public DateTime now;        /// <summary>        /// log发生时间        /// </summary>        public Exception ex;        /// <summary>        /// log构造函数        /// </summary>        /// <param name="logType"></param>        /// <param name="logPlace"></param>        /// <param name="message"></param>        public Log(String logType, String logPlace, String message)        {            this.logType = logType;            this.logPlace = logPlace;            this.message = message;            this.now = DateTime.Now;        }        public Log(String logType, String logPlace, Exception ex)        {            this.logType = logType;            this.logPlace = logPlace;            this.ex = ex;            this.now = DateTime.Now;        }    }

通过这种方式可以防止程序阻塞，也不会过多的影响处理线程的执行效率。

欢迎指正。