C#实现线程安全的简易日志记录方法

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！