C# log4net日志使用

第一步：新增帮助类库，即动态库，具体实现如下

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using log4net; using log4net.Appender; using log4net.Config; using log4net.Layout; using log4net.Repository.Hierarchy; using System; using System.Data; using System.Text;   namespace KUN.Common {     public class LogHelper     {         #region 变量定义         //定义信息的二次处理         public static event Action<string> OutputMessage;         //ILog对象         private static readonly ILog log = LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);         //记录异常日志数据库连接字符串         private const string _ConnectionString = @"data source=your server;initial catalog=your db;integrated security=false;persist security info=True;User ID=sa;Password=1111";         //信息模板         private const string _ConversionPattern = "%n【记录时间】%date%n【描述】%message%n";         #endregion           #region 定义信息二次处理方式         private static void HandMessage(object Msg)         {             //if (OutputMessage != null)             //{             //    OutputMessage(Msg.ToString());             //}         }         private static void HandMessage(object Msg, Exception ex)         {             if (OutputMessage != null)             {                 OutputMessage(string.Format("{0}:{1}", Msg.ToString(), ex.ToString()));             }         }         private static void HandMessage(string format, params object[] args)         {             if (OutputMessage != null)             {                 OutputMessage(string.Format(format, args));             }         }         #endregion           #region 封装Log4net         public static void Debug(object message)         {             HandMessage(message);             if (log.IsDebugEnabled)             {                 log.Debug(message);             }         }         public static void Debug(object message, Exception ex)         {             HandMessage(message, ex);             if (log.IsDebugEnabled)             {                 log.Debug(message, ex);             }         }         public static void DebugFormat(string format, params object[] args)         {             HandMessage(format, args);             if (log.IsDebugEnabled)             {                 log.DebugFormat(format, args);             }         }         public static void Error(object message)         {             HandMessage(message);             if (log.IsErrorEnabled)             {                 log.Error(message);             }         }         public static void Error(object message, Exception ex)         {             HandMessage(message, ex);             if (log.IsErrorEnabled)             {                 log.Error(message, ex);             }         }         public static void ErrorFormat(string format, params object[] args)         {             HandMessage(format, args);             if (log.IsErrorEnabled)             {                 log.ErrorFormat(format, args);             }         }         public static void Fatal(object message)         {             HandMessage(message);             if (log.IsFatalEnabled)             {                 log.Fatal(message);             }         }         public static void Fatal(object message, Exception ex)         {             HandMessage(message, ex);             if (log.IsFatalEnabled)             {                 log.Fatal(message, ex);             }         }         public static void FatalFormat(string format, params object[] args)         {             HandMessage(format, args);             if (log.IsFatalEnabled)             {                 log.FatalFormat(format, args);             }         }         public static void Info(object message)         {             HandMessage(message);             if (log.IsInfoEnabled)             {                 log.Info(message);             }         }         public static void Info(object message, Exception ex)         {             HandMessage(message, ex);             if (log.IsInfoEnabled)             {                 log.Info(message, ex);             }         }         public static void InfoFormat(string format, params object[] args)         {             HandMessage(format, args);             if (log.IsInfoEnabled)             {                 log.InfoFormat(format, args);             }         }         public static void Warn(object message)         {             HandMessage(message);             if (log.IsWarnEnabled)             {                 log.Warn(message);             }         }         public static void Warn(object message, Exception ex)         {             HandMessage(message, ex);             if (log.IsWarnEnabled)             {                 log.Warn(message, ex);             }         }         public static void WarnFormat(string format, params object[] args)         {             HandMessage(format, args);             if (log.IsWarnEnabled)             {                 log.WarnFormat(format, args);             }         }         #endregion           #region 手动加载配置         public static void LoadADONetAppender()         {             Hierarchy hier = LogManager.GetLoggerRepository() as log4net.Repository.Hierarchy.Hierarchy;             if (hier != null)             {                 log4net.Appender.AdoNetAppender appender = new log4net.Appender.AdoNetAppender();                 appender.Name = "AdoNetAppender";                 appender.CommandType = CommandType.Text;                 appender.BufferSize = 1;                 appender.ConnectionType = "System.Data.SqlClient.SqlConnection, System.Data, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089";                 appender.ConnectionString = _ConnectionString;                 appender.CommandText = @"INSERT INTO Log ([Date],[Thread],[Level],[Logger],[Message],[Exception]) VALUES (@log_date, @thread, @log_level, @logger, @message, @exception)";                 appender.AddParameter(new AdoNetAppenderParameter { ParameterName = "@log_date", DbType = System.Data.DbType.DateTime, Layout = new log4net.Layout.RawTimeStampLayout() });                 appender.AddParameter(new AdoNetAppenderParameter { ParameterName = "@thread", DbType = System.Data.DbType.String, Size = 255, Layout = new Layout2RawLayoutAdapter(new PatternLayout("%thread")) });                 appender.AddParameter(new AdoNetAppenderParameter { ParameterName = "@log_level", DbType = System.Data.DbType.String, Size = 50, Layout = new Layout2RawLayoutAdapter(new PatternLayout("%level")) });                 appender.AddParameter(new AdoNetAppenderParameter { ParameterName = "@logger", DbType = System.Data.DbType.String, Size = 255, Layout = new Layout2RawLayoutAdapter(new PatternLayout("%logger")) });                 appender.AddParameter(new AdoNetAppenderParameter { ParameterName = "@message", DbType = System.Data.DbType.String, Size = 4000, Layout = new Layout2RawLayoutAdapter(new PatternLayout("%message")) });                 appender.AddParameter(new AdoNetAppenderParameter { ParameterName = "@exception", DbType = System.Data.DbType.String, Size = 4000, Layout = new Layout2RawLayoutAdapter(new ExceptionLayout()) });                 appender.ActivateOptions();                 BasicConfigurator.Configure(appender);             }         }           public static void LoadFileAppender()         {             FileAppender appender = new FileAppender();             appender.Name = "FileAppender";             appender.File = "error.log";             appender.AppendToFile = true;               PatternLayout patternLayout = new PatternLayout();             patternLayout.ConversionPattern = _ConversionPattern;             patternLayout.ActivateOptions();             appender.Layout = patternLayout;               //选择UTF8编码，确保中文不乱码。             appender.Encoding = Encoding.UTF8;               appender.ActivateOptions();             BasicConfigurator.Configure(appender);           }           public static void LoadRollingFileAppender()         {             RollingFileAppender appender = new RollingFileAppender();             appender.AppendToFile = true;             appender.Name = "RollingFileAppender";             appender.DatePattern = "yyyy-MM-dd HH'时.log'";             appender.File = "Logs/";             appender.AppendToFile = true;             appender.RollingStyle = RollingFileAppender.RollingMode.Composite;             appender.MaximumFileSize = "500kb";             appender.MaxSizeRollBackups = 10;             appender.StaticLogFileName = false;                 PatternLayout patternLayout = new PatternLayout();             patternLayout.ConversionPattern = _ConversionPattern;             patternLayout.ActivateOptions();             appender.Layout = patternLayout;               //选择UTF8编码，确保中文不乱码。             appender.Encoding = Encoding.UTF8;               appender.ActivateOptions();             BasicConfigurator.Configure(appender);         }           public static void LoadConsoleAppender()         {             ConsoleAppender appender = new ConsoleAppender();             appender.Name = "ConsoleAppender";               PatternLayout patternLayout = new PatternLayout();             patternLayout.ConversionPattern = _ConversionPattern;             patternLayout.ActivateOptions();             appender.Layout = patternLayout;               appender.ActivateOptions();             BasicConfigurator.Configure(appender);         }           public static void LoadTraceAppender()         {             TraceAppender appender = new TraceAppender();             appender.Name = "TraceAppender";               PatternLayout patternLayout = new PatternLayout();             patternLayout.ConversionPattern = _ConversionPattern;             patternLayout.ActivateOptions();             appender.Layout = patternLayout;               appender.ActivateOptions();             BasicConfigurator.Configure(appender);         }           #endregion           #region 定义常规应用程序中未处理的异常信息记录方式         public static void LoadUnhandledException()         {             AppDomain.CurrentDomain.UnhandledException += new UnhandledExceptionEventHandler((sender, e) =>             {                 log.Fatal("未处理的异常", e.ExceptionObject as Exception);             });         }         #endregion     } }

第二步：nuget安装log4net,略

第三步：配置文件复制到项目位置，略，同时设置属性为，始终复制+内容

log4net.config，内容如下

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<?xml version="1.0" encoding="utf-8" ?> <configuration>   <!-- This section contains the log4net configuration settings -->   <log4net>     <appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">       <layout type="log4net.Layout.PatternLayout" value="%date [%thread] %-5level %logger - %message%newline" />     </appender>       <appender name="FileAppender" type="log4net.Appender.FileAppender">       <file value="log-file.log" />       <appendToFile value="true" />       <layout type="log4net.Layout.PatternLayout">         <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />       </layout>     </appender>       <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">       <file value="Logs/" />       <appendToFile value="true" />       <rollingStyle value="Composite" />       <staticLogFileName value="false" />       <datePattern value="yyyyMMdd'.log'" />       <maxSizeRollBackups value="10" />       <maximumFileSize value="1MB" />       <layout type="log4net.Layout.PatternLayout">         <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />       </layout>     </appender>       <!-- Setup the root category, add the appenders and set the default level -->     <root>       <level value="ALL" />       <appender-ref ref="RollingLogFileAppender" />     </root>     </log4net> </configuration>

第四步：应用项目中，注册使用，如下所示：

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using log4net.Config; using log4net.Repository; using System; using System.IO; using System.Windows.Forms;   namespace Demo {     static class Program     {         /// <summary>         /// ILoggerRepository repository         /// </summary>         public static ILoggerRepository repository { get; set; }         /// <summary>         /// 应用程序的主入口点。         /// </summary>         [STAThread]         static void Main()         {             Application.EnableVisualStyles();             Application.SetCompatibleTextRenderingDefault(false);               //加log4日志             repository = log4net.LogManager.GetRepository();             XmlConfigurator.Configure(repository, new FileInfo("log4net.config"));               Application.Run(new Form1());         }     } }

第五步：测试使用，如下，详细略

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private void btnLogTest_Click(object sender, EventArgs e)        {            LogHelper.ErrorFormat("log4net-{0}", "日志测试一把");        }