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ASP.NET Core 使用Log4net

news 来源：原创 2024/9/20 11:38:20

1. Nuget安装log4net，图里的两个

2.项目根目录下添加log4net.config.添加下面的代码:

<?xml version="1.0" encoding="utf-8"?>
<configuration><!-- This section contains the log4net configuration settings --><log4net><appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender"><file value="Log/" /><appendToFile value="true" /><rollingStyle value="Composite" /><staticLogFileName value="false" /><datePattern value="yyyy-MM-dd'.log'" /><maxSizeRollBackups value="10" /><maximumFileSize value="10MB" /><layout type="log4net.Layout.PatternLayout"><conversionPattern value="%date  [%thread]  %-5level  %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>

3. 添加一个logHelper.cs

    public class LogHelper{private static readonly ILog logger;static LogHelper(){if (logger == null){var repository = LogManager.CreateRepository("NETCoreRepository");XmlConfigurator.Configure(repository, new FileInfo("log4net.config"));logger = LogManager.GetLogger(repository.Name, "InfoLogger");}}/// <summary>/// 普通日志/// </summary>/// <param name="message"></param>/// <param name="exception"></param>public static void Info(string message, Exception exception = null){if (exception == null)logger.Info(message);elselogger.Info(message, exception);}/// <summary>/// 告警日志/// </summary>/// <param name="message"></param>/// <param name="exception"></param>public static void Warn(string message, Exception exception = null){if (exception == null)logger.Warn(message);elselogger.Warn(message, exception);}/// <summary>/// 错误日志/// </summary>/// <param name="message"></param>/// <param name="exception"></param>public static void Error(string message, Exception exception = null){if (exception == null)logger.Error(message);elselogger.Error(message, exception);}}

4. 调用:

LogHelper.Info("test Info log");　　   //普通日志
LogHelper.Warn("test Warn log");　     //告警日志
LogHelper.Error("test Error log");　　 //错误日志

项目里就会生成log文件

可以用来输出SQL:

public class DbContext{private static SqlSugarClient _db = null;/// <summary>/// test是数据库名/// </summary>public static string ConnectionString = "server=localhost;uid=aaa;pwd=123;database=test_db";public SqlSugarClient CreateClient(){_db = new SqlSugarClient(new ConnectionConfig(){ConnectionString = ConnectionString, //数据库连接字符串DbType = DbType.MySql, //必填IsAutoCloseConnection = true, //默认falseInitKeyType = InitKeyType.Attribute,AopEvents = new AopEvents{OnLogExecuting = (sql, pars) =>{LogHelper.Info("执行SQL: " + sql);if (pars!=null){LogHelper.Info("Parameter: ");foreach (var s in pars){LogHelper.Info(string.Format("{0}:{1};", s.ParameterName, s.Value));}}}}});return _db;}}

如果是放在类库，则类库添加Nuget引用后，把log4net.config和logHelper.cs放在类库里。注意log4net.config要放在根目录，设置此文件的属性复制到输出目录为：始终复制。

下图仅为示例：