C# 简易异步日志类代码,CSharp代码库,德仔网

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【CSharp】 C# 简易异步日志类
作者:农民伯伯 / 发布于2014/3/25/ 364
帮助类文件Logger.cs
//=========================================

//

// 作 者：农民伯伯

// 邮 箱：over140@gmail.com

// 博 客：http://over140.cnblogs.com/

// 时 间：2009-7-16

// 描 述：日志类，注意需要在日志记录的目录给用户写入权限!

//

//=========================================



using System;

using System.Configuration;

using System.Collections.Generic;

using System.Data.SqlClient;

using System.Diagnostics;

using System.IO;

using System.Text;

using System.Runtime.CompilerServices;

using System.Web;





namespace CentralHousesTest

{

  /// <summary>

  /// 日志类

  /// </summary>

  public sealed class Logger

  {

    #region Member Variables



    /// <summary>

    /// 用于Trace的组织输出的类别名称

    /// </summary>

    private const string trace_sql = "\r\n***********************TRACE_SQL {0}*****************************\r\nTRACE_SQL";



    /// <summary>

    /// 用于Trace的组织输出的类别名称

    /// </summary>

    private const string trace_exception = "\r\n***********************TRACE_EXCEPTION {0}***********************";



    /// <summary>

    /// 当前日志的日期

    /// </summary>

    private static DateTime CurrentLogFileDate = DateTime.Now;



    /// <summary>

    /// 日志对象

    /// </summary>

    private static TextWriterTraceListener twtl;



    /// <summary>

    /// 日志根目录

    /// </summary>

    private const string log_root_directory = @"D:\log";



    /// <summary>

    /// 日志子目录

    /// </summary>

    private static string log_subdir;





    /// <summary>

    /// "   {0} = {1}"

    /// </summary>

    private const string FORMAT_TRACE_PARAM = "   {0} = {1}";



    /// <summary>

    /// 1  仅控制台输出

    /// 2  仅日志输出

    /// 3  控制台+日志输出

    /// </summary>

    private static readonly int flag = 2;     //可以修改成从配置文件读取



    #endregion



    #region Constructor



    static Logger()

    {

      System.Diagnostics.Trace.AutoFlush = true;



      switch (flag)

      {

        case 1:

          System.Diagnostics.Trace.Listeners.Add(new ConsoleTraceListener());

          break;

        case 2:

          System.Diagnostics.Trace.Listeners.Add(TWTL);

          break;

        case 3:

          System.Diagnostics.Trace.Listeners.Add(new ConsoleTraceListener());

          System.Diagnostics.Trace.Listeners.Add(TWTL);

          break;

      }

    }



    #endregion



    #region Method



    #region trace



    /// <summary>

    /// 异步错误日志

    /// </summary>

    /// <param name="value"></param>

    public static void Trace(Exception ex)

    {

      new AsyncLogException(BeginTraceError).BeginInvoke(ex, null, null);

    }



    /// <summary>

    /// 异步SQL日志

    /// </summary>

    /// <param name="cmd"></param>

    public static void Trace(SqlCommand cmd)

    {

      new AsyncLogSqlCommand(BeginTraceSqlCommand).BeginInvoke(cmd, null, null);

    }



    /// <summary>

    /// 异步SQL日志

    /// </summary>

    /// <param name="sql"></param>

    /// <param name="parameter"></param>

    public static void Trace(string sql, params SqlParameter[] parameter)

    {

      new AsyncLogSql(BeginTraceSql).BeginInvoke(sql, parameter, null, null);

    }



    #endregion



    #region delegate



    private delegate void AsyncLogException(Exception ex);

    private delegate void AsyncLogSqlCommand(SqlCommand cmd);

    private delegate void AsyncLogSql(string sql, params SqlParameter[] parameter);



    private static void BeginTraceError(Exception ex)

    {

      if (null != ex)

      {

        //检测日志日期

        StrategyLog();



        //输出日志头

        System.Diagnostics.Trace.WriteLine(string.Format(trace_exception, DateTime.Now));

        while (null != ex)

        {

          System.Diagnostics.Trace.WriteLine(string.Format("{0} {1}\r\n{2}\r\nSource:{3}", ex.GetType().Name, ex.Message, ex.StackTrace, ex.Source));

          ex = ex.InnerException;

        }

      }

    }



    private static void BeginTraceSqlCommand(SqlCommand cmd)

    {

      if (null != cmd)

      {

        SqlParameter[] parameter = new SqlParameter[cmd.Parameters.Count];

        cmd.Parameters.CopyTo(parameter, 0);

        BeginTraceSql(cmd.CommandText, parameter);

      }

    }



    private static void BeginTraceSql(string sql, params SqlParameter[] parameter)

    {

      if (!string.IsNullOrEmpty(sql))

      {

        //检测日志日期

        StrategyLog();



        System.Diagnostics.Trace.WriteLine(sql, string.Format(trace_sql, DateTime.Now));

        if (parameter != null)

        {

          foreach (SqlParameter param in parameter)

          {

            System.Diagnostics.Trace.WriteLine(string.Format(FORMAT_TRACE_PARAM, param.ParameterName, param.Value));

          }

        }

      }

    }



    #endregion



    #region helper



    /// <summary>

    /// 根据日志策略生成日志

    /// </summary>

    private static void StrategyLog()

    {

      //判断日志日期

      if (DateTime.Compare(DateTime.Now.Date, CurrentLogFileDate.Date) != 0)

      {

        DateTime currentDate = DateTime.Now.Date;



        //生成子目录

        BuiderDir(currentDate);

        //更新当前日志日期

        CurrentLogFileDate = currentDate;



        System.Diagnostics.Trace.Flush();



        //更改输出

        if (twtl != null)

          System.Diagnostics.Trace.Listeners.Remove(twtl);



        System.Diagnostics.Trace.Listeners.Add(TWTL);

      }

    }



    /// <summary>

    /// 根据年月生成子目录

    /// </summary>

    /// <param name="currentDate"></param>

    private static void BuiderDir(DateTime currentDate)

    {

      int year = currentDate.Year;

      int month = currentDate.Month;

      //年/月

      string subdir = string.Concat(year, '\\', month);

      string path = Path.Combine(log_root_directory, subdir);

      if (!Directory.Exists(path))

      {

        Directory.CreateDirectory(path);

      }

      log_subdir = subdir;

    }



    #endregion



    #endregion



    #region Properties



    /// <summary>

    /// 日志文件路径

    /// </summary>

    /// <returns></returns>

    private static string GetLogFullPath

    {

      get

      {

        return string.Concat(log_root_directory, '\\', string.Concat(log_subdir, @"\log", CurrentLogFileDate.ToShortDateString(), ".txt"));

      }

    }



    /// <summary>

    /// 跟踪输出日志文件

    /// </summary>

    private static TextWriterTraceListener TWTL

    {

      get

      {

        if (twtl == null)

        {

          if (string.IsNullOrEmpty(log_subdir))

            BuiderDir(DateTime.Now);

          else

          {

            string logPath = GetLogFullPath;

            if (!Directory.Exists(Path.GetDirectoryName(logPath)))

              BuiderDir(DateTime.Now);

          }

          twtl = new TextWriterTraceListener(GetLogFullPath);

        }

        return twtl;

      }

    }



    #endregion



  }

}
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