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  • C#教程之WebForm应用log4net记录错误日志——使用线

我的项目结构如下图：

日志帮助类库需要log4net包：工具—NuGet包管理器—管理解决方案NuGet程序包

线程日志帮助类 FlashLogger.cs 代码

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using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using System.Web;
using log4net;
using log4net.Config;

namespace FlashLog
{
    public sealed class FlashLogger
    {
        /// <summary>
        /// 记录消息Queue
        /// </summary>
        private readonly ConcurrentQueue<FlashLogMessage> _que;

        /// <summary>
        /// 信号
        /// </summary>
        private readonly ManualResetEvent _mre;

        /// <summary>
        /// 日志
        /// </summary>
        private readonly ILog _log;

        /// <summary>
        /// 日志
        /// </summary>
        private static FlashLogger _flashLog = new FlashLogger();


        private FlashLogger()
        {
            var configFile = new FileInfo(HttpContext.Current.Server.MapPath("~/log4net.config"));
            if (!configFile.Exists)
            {
                throw new Exception("未配置log4net配置文件！");
            }

            // 设置日志配置文件路径
            XmlConfigurator.Configure(configFile);

            _que = new ConcurrentQueue<FlashLogMessage>();
            _mre = new ManualResetEvent(false);
            _log = LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
        }

        /// <summary>
        /// 实现单例
        /// </summary>
        /// <returns></returns>
        public static FlashLogger Instance()
        {
            return _flashLog;
        }

        /// <summary>
        /// 另一个线程记录日志，只在程序初始化时调用一次
        /// </summary>
        public void Register()
        {
            Thread t = new Thread(new ThreadStart(WriteLog));
            t.IsBackground = false;
            t.Start();
        }

        /// <summary>
        /// 从队列中写日志至磁盘
        /// </summary>
        private void WriteLog()
        {
            while (true)
            {
                // 等待信号通知
                _mre.WaitOne();

                FlashLogMessage msg;
                // 判断是否有内容需要如磁盘 从列队中获取内容，并删除列队中的内容
                while (_que.Count > 0 && _que.TryDequeue(out msg))
                {
                    // 判断日志等级，然后写日志
                    switch (msg.Level)
                    {
                        case FlashLogLevel.Debug:
                            _log.Debug(msg.Message, msg.Exception);
                            break;
                        case FlashLogLevel.Info:
                            _log.Info(msg.Message, msg.Exception);
                            break;
                        case FlashLogLevel.Error:
                            _log.Error(msg.Message, msg.Exception);
                            break;
                        case FlashLogLevel.Warn:
                            _log.Warn(msg.Message, msg.Exception);
                            break;
                        case FlashLogLevel.Fatal:
                            _log.Fatal(msg.Message, msg.Exception);
                            break;
                    }
                }

                // 重新设置信号
                _mre.Reset();
                Thread.Sleep(1);
            }
        }


        /// <summary>
        /// 写日志
        /// </summary>
        /// <param name="message">日志文本</param>
        /// <param name="level">等级</param>
        /// <param name="ex">Exception</param>
        public void EnqueueMessage(string message, FlashLogLevel level, Exception ex = null)
        {
            if ((level == FlashLogLevel.Debug && _log.IsDebugEnabled)
             || (level == FlashLogLevel.Error && _log.IsErrorEnabled)
             || (level == FlashLogLevel.Fatal && _log.IsFatalEnabled)
             || (level == FlashLogLevel.Info && _log.IsInfoEnabled)
             || (level == FlashLogLevel.Warn && _log.IsWarnEnabled))
            {
                _que.Enqueue(new FlashLogMessage
                {
                    Message = "[" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss,fff") + "]\r\n" + message,
                    Level = level,
                    Exception = ex
                });

                // 通知线程往磁盘中写日志
                _mre.Set();
            }
        }

        public static void Debug(string msg, Exception ex = null)
        {
            Instance().EnqueueMessage(msg, FlashLogLevel.Debug, ex);
        }

        public static void Error(string msg, Exception ex = null)
        {
            Instance().EnqueueMessage(msg, FlashLogLevel.Error, ex);
        }

        public static void Fatal(string msg, Exception ex = null)
        {
            Instance().EnqueueMessage(msg, FlashLogLevel.Fatal, ex);
        }

        public static void Info(string msg, Exception ex = null)
        {
            Instance().EnqueueMessage(msg, FlashLogLevel.Info, ex);
        }

        public static void Warn(string msg, Exception ex = null)
        {
            Instance().EnqueueMessage(msg, FlashLogLevel.Warn, ex);
        }

    }
    /// <summary>
    /// 日志等级
    /// </summary>
    public enum FlashLogLevel
    {
        Debug,
        Info,
        Error,
        Warn,
        Fatal
    }
    /// <summary>
    /// 日志内容
    /// </summary>
    public class FlashLogMessage
    {
        public string Message { get; set; }
        public FlashLogLevel Level { get; set; }
        public Exception Exception { get; set; }

    }
}
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WebForm项目创建：

1.需要引用线程日志类库 FlashLog

2.添加log4net配置文件 log4net.config，实现了数据库及文件记录日志

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CREATE TABLE ErrorLog
(
    dtDate DATETIME,
    sThread NVARCHAR(100),
    sLevel NVARCHAR(100),
    sLogger NVARCHAR(500),
    sMessage NVARCHAR(500), 
    sException NTEXT
)
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<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
      <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net"/>
  </configSections>
  <log4net debug="false">
    <!-- 将日志信息写入SQL Server数据库-->
    <appender name="ADONetAppender" type="log4net.Appender.ADONetAppender">
      <bufferSize value="1" />
      <connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
      <connectionString value="SERVER=服务器;DATABASE=数据库;UID=用户名;PWD=密码;Connect Timeout=15;" />
      <commandText value="INSERT INTO ErrorLog ([dtDate],[sThread],[sLevel],[sLogger],[sMessage],[sException]) VALUES (@log_date, @thread, @log_level, @logger, @message, @exception)" />
      <parameter>
        <parameterName value="@log_date" />
        <dbType value="DateTime" />
        <layout type="log4net.Layout.RawTimeStampLayout" />
      </parameter>
      <parameter>
        <parameterName value="@thread" />
        <dbType value="String" />
        <size value="100" />
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%t" />
        </layout>
      </parameter>
      <parameter>
        <parameterName value="@log_level" />
        <dbType value="String" />
        <size value="200" />
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%p" />
        </layout>
      </parameter>
      <parameter>
        <parameterName value="@logger" />
        <dbType value="String" />
        <size value="500" />
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%logger" />
        </layout>
      </parameter>
      <parameter>
        <parameterName value="@message" />
        <dbType value="String" />
        <size value="3000" />
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%m" />
        </layout>
      </parameter>
      <parameter>
        <parameterName value="@exception" />
        <dbType value="String" />
        <layout type="log4net.Layout.ExceptionLayout" />
      </parameter>
    </appender>

    <!-- 将日志信息写入到项目日志文件 -->
    <appender name="LogToFile" type="log4net.Appender.RollingFileAppender">
      <encoding value="utf-8" />
      <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
      <file value="Logs\" />
      <datePattern value="yyyy.MM.dd'.log'" />
      <staticLogFileName value="false" />
      <appendToFile value="true" />
      <rollingStyle value="Composite" />
      <maxSizeRollBackups value="10" />
      <maximumFileSize value="50MB" />
      <layout type="log4net.Layout.PatternLayout">
        <ConversionPattern value="%date 线程ID:[%thread] 日志级别：%-5level 出错类：%logger property:[%property{NDC}] - 错误描述：%message %newline" />
      </layout>
    </appender>
    
    <!--设置根目录，添加appenders并设置默认日志等级 -->
    <root>
      <level value="All" />
      <appender-ref ref="ADONetAppender" />
      <appender-ref ref="LogToFile"/>
    </root>
  </log4net>

</configuration>
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3.需要添加全局应用程序类 Global.asax

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.SessionState;

namespace LogWeb
{
    public class Global : System.Web.HttpApplication
    {
        protected void Application_Start(object sender, EventArgs e)
        {
            // 在应用程序启动时运行的代码
            FlashLog.FlashLogger.Instance().Register();
        }
    }
}
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4.实例应用：访问无效域名时记录错误日志

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                try
                {
                    string checkTonkenUrl = "http://url.abcde.com";
                    WebRequest wRequest = WebRequest.Create(checkTonkenUrl);
                    wRequest.Method = "GET";
                    wRequest.ContentType = "text/html;charset=UTF-8";
                    WebResponse wResponse = wRequest.GetResponse();
                    Stream stream = wResponse.GetResponseStream();
                    StreamReader reader = new StreamReader(stream, System.Text.Encoding.UTF8);
                    string str = reader.ReadToEnd();   //url返回的值
                }
                catch (Exception ex)
                {
                    FlashLogger.Error("Error", ex);
                }
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到此，log4net日志配置完成。

相关程序源码可以点击此处下载：链接: https://pan.baidu.com/s/1bu29Ba9zxyAs-oAmdaSI-A 密码: upw2

另外附上自己整理的.net Core WebAPI 应用log4net，大家可以看下源码：链接: https://pan.baidu.com/s/14wOIi1je0a02blM7_zlASg 密码: gd9b


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