一般在实际项目的开发中，会要求涉及日志记录的问题，比较常用的有Log4Net，NLog等几个，而小项目小工具的话，则无需费此大驾。而譬如串口开发的话，需要记录串口过来的数据等等，这时候就要考虑日志记录上线程的问题。对此，为了方便后续使用，封装了下代码：

using System;using System.Diagnostics;using System.IO;using System.Text;using System.Threading;namespace CSharpUtilHelpV2{ /// <summary> /// 日志类型枚举 /// </summary> public enum LogType { /// <summary> /// 一般输出 /// </summary> Trace, /// <summary> /// 警告 /// </summary> Warning, /// <summary> /// 错误 /// </summary> Error, /// <summary> /// SQL /// </summary> SQL } /// <summary> /// 基于.NET 2.0日志工具类 /// </summary> public class LogToolV2 { private static readonly Thread LogTask; private static readonly ThreadSafeQueueV2<string> LogColQueue;//自定义线程安全的Queue private static readonly object SyncRoot; private static readonly string FilePath; private static readonly long BackFileSize_MB = 2;//超过2M就开始备份日志文件 static LogToolV2() { SyncRoot = new object(); FilePath = AppDomain.CurrentDomain.SetupInformation.ApplicationBase + "Log\\"; LogTask = new Thread(WriteLog); LogColQueue = new ThreadSafeQueueV2<string>(); LogTask.Start(); Debug.WriteLine("Log Start......"); } /// <summary> /// 记录日志 /// </summary> /// <param name="msg">日志内容</param> public static void Log(string msg) { string _msg = string.Format("{0} : {2}", DateTime.Now.ToString("HH:mm:ss"), msg); LogColQueue.Enqueue(msg); } /// <summary> /// 记录日志 /// </summary> /// <param name="msg">日志内容</param> /// <param name="type">日志类型</param> public static void Log(string msg, LogType type) { string _msg = string.Format("{0} {1}: {2}", DateTime.Now.ToString("HH:mm:ss"), type, msg); LogColQueue.Enqueue(_msg); } /// <summary> /// 记录日志 /// </summary> /// <param name="ex">异常</param> public static void Log(Exception ex) { if (ex != null) { string _newLine = Environment.NewLine; StringBuilder _builder = new StringBuilder(); _builder.AppendFormat("{0}: {1}{2}", DateTime.Now.ToString("HH:mm:ss"), ex.Message, _newLine); _builder.AppendFormat("{0}{1}", ex.GetType(), _newLine); _builder.AppendFormat("{0}{1}", ex.Source, _newLine); _builder.AppendFormat("{0}{1}", ex.TargetSite, _newLine); _builder.AppendFormat("{0}{1}", ex.StackTrace, _newLine); LogColQueue.Enqueue(_builder.ToString()); } } private static void WriteLog() { while (true) { if (LogColQueue.Count() > 0) { string _msg = LogColQueue.Dequeue(); Monitor.Enter(SyncRoot); if (!CreateDirectory()) continue; string _path = string.Format("{0}{1}.log", FilePath, DateTime.Now.ToString("yyyyMMdd")); Monitor.Exit(SyncRoot); lock (SyncRoot) { if (CreateFile(_path)) ProcessWriteLog(_path, _msg);//写入日志到文本 } ProcessBackLog(_path);//日志备份 } } } private static void ProcessBackLog(string path) { lock (SyncRoot) { if (FileToolV2.GetMBSize(path) > BackFileSize_MB) { FileToolV2.CopyToBak(path); } } } private static void ProcessWriteLog(string path, string msg) { try { StreamWriter _sw = File.AppendText(path); _sw.WriteLine(msg); _sw.Flush(); _sw.Close(); } catch (Exception ex) { Debug.WriteLine(string.Format("写入日志失败，原因:{0}", ex.Message)); } } private static bool CreateFile(string path) { bool _result = true; try { if (!File.Exists(path)) { FileStream _files = File.Create(path); _files.Close(); } } catch (Exception) { _result = false; } return _result; } private static bool CreateDirectory() { bool _result = true; try { if (!Directory.Exists(FilePath)) { Directory.CreateDirectory(FilePath); } } catch (Exception) { _result = false; } return _result; } }}

测试代码如下：

using CSharpUtilHelpV2;using System;using System.Diagnostics;using System.Threading;namespace LogUtilHelpV2Test{ class Program { static void Main(string[] args) { try { Debug.WriteLine("-------------"); Action _writeLog = delegate() { for (int i = 0; i < 10000; i++) LogToolV2.Log(Guid.NewGuid().ToString(), LogType.Trace); }; Thread _wireteLogTask1 = new Thread(new ThreadStart(_writeLog)); _wireteLogTask1.Start(); Thread _wireteLogTask2 = new Thread(new ThreadStart(_writeLog)); _wireteLogTask2.Start(); //throw new Exception("test aaa bb cc"); } catch (Exception ex) { LogToolV2.Log(ex); Console.WriteLine(ex.Message.Trim()); } finally { Console.WriteLine("ok"); Console.ReadLine(); } } }}

代码运行效果如下所示：

感兴趣的读者可以自己测试运行一下，希望能对大家起到一点帮助！