asp.net core 集成 log4net 日志框架

Intro

在 asp.net core 中有些日志我們可能想輸出到數(shù)據(jù)庫或文件或elasticsearch等，如果不自己去實現(xiàn)一個 LoggerProvider 的話就需要借助第三方日志框架實現(xiàn)了，而一些第三方框架的實現(xiàn)大多比較完善和成熟，不失為一個好辦法。

自己寫了一個 log4net 的擴展 WeihanLi.Common.Logging.Log4Net，提供了在 .net core 中使用 log4net 的擴展

安裝 nuget 包

通過 nuget 安裝 WeihanLi.Common.Logging.Log4Net

使用

基本使用

ILoggerFactory loggerFactory = new LoggerFactory(); loggerFactory.AddLog4Net(); // loggerFactory.AddLog4Net(log4netConfigFilePath);

你可以在 asp.net core 應用里你的 Startup 文件中使用下面代碼進行配置

// This method gets called by the runtime. Use this method to configure the HTTP request pipeline. public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory){loggerFactory.AddLog4Net(); // loggerFactory.AddLog4Net(log4netConfigFilePath);// ...}

默認使用當前目錄下的 log4net.config 文件作為 log4net 的配置文件，如果不是需要自己設置 log4net 配置文件的路徑。

log4net 配置參考 示例配置

源碼解析

項目源碼

Log4NetLoggerProvider

• 實現(xiàn)記錄日志的 ILogger

internal class Log4NetLogger : ILogger{private readonly ILog _logger;public Log4NetLogger(string name) => _logger = LogManager.GetLogger(ApplicationHelper.ApplicationName, name);public IDisposable BeginScope<TState>(TState state) => NullScope.Instance;public bool IsEnabled(LogLevel logLevel){switch (logLevel){case LogLevel.Critical:return _logger.IsFatalEnabled;case LogLevel.Debug:case LogLevel.Trace:return _logger.IsDebugEnabled;case LogLevel.Error:return _logger.IsErrorEnabled;case LogLevel.Information:return _logger.IsInfoEnabled;case LogLevel.Warning:return _logger.IsWarnEnabled;case LogLevel.None:return false;default:throw new ArgumentOutOfRangeException(nameof(logLevel));}}public void Log<TState>(LogLevel logLevel, EventId eventId, TState state,Exception exception, Func<TState, Exception, string> formatter){if (!IsEnabled(logLevel)){return;}if (formatter == null){throw new ArgumentNullException(nameof(formatter));}var message = formatter(state, exception);if (!(string.IsNullOrEmpty(message) && exception == null)){switch (logLevel){case LogLevel.Critical:_logger.Fatal(message, exception);break;case LogLevel.Debug:case LogLevel.Trace:_logger.Debug(message, exception);break;case LogLevel.Error:_logger.Error(message, exception);break;case LogLevel.Information:_logger.Info(message, exception);break;case LogLevel.Warning:_logger.Warn(message, exception);break;default:_logger.Warn($"Encountered unknown log level {logLevel}, writing out as Info.");_logger.Info(message, exception);break;}}}}

• 實現(xiàn)提供 logger 的 ILoggerProvider

[ProviderAlias("log4net")]internal class Log4NetLoggerProvider : ILoggerProvider{private readonly ConcurrentDictionary<string, Log4NetLogger> _loggers =new ConcurrentDictionary<string, Log4NetLogger>(StringComparer.Ordinal);public Log4NetLoggerProvider(string confFilePath){if (null == LogManager.GetAllRepositories()?.FirstOrDefault(_ => _.Name == ApplicationHelper.ApplicationName)){XmlConfigurator.ConfigureAndWatch(LogManager.CreateRepository(ApplicationHelper.ApplicationName), new FileInfo(confFilePath));}}public void Dispose() => _loggers.Clear();public ILogger CreateLogger(string categoryName) => _loggers.GetOrAdd(categoryName, loggerName => new Log4NetLogger(loggerName));}

• 添加 ILoggerFactory 擴展

public static class Log4NetLoggerFactoryExtensions{public static ILoggerFactory AddLog4Net(this ILoggerFactory factory){factory.AddProvider(new Log4NetLoggerProvider(ApplicationHelper.MapPath("log4net.config")));return factory;}public static ILoggerFactory AddLog4Net(this ILoggerFactory factory, string configFile){factory.AddProvider(new Log4NetLoggerProvider(configFile));return factory;}}

Memo

如果有什么問題或建議，歡迎指出

轉(zhuǎn)載于:https://www.cnblogs.com/weihanli/p/10454728.html

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