最近项目需要用log4net来写日志，因为整个平台式在sharepoint上，我们需要记录具体是哪个子站点发生的日志，因此需要再原来的log表里面添加一个自定义信息列。由于平台的安全性要求，我们需要对连接字符串加密。连接字符串的信息是在AdoNetAppender读取的，所以我们要扩展该类。而自定义消息我们需要扩展PatternLayout类。其实有关log4net的介绍网上已经很多了，如log4net.dll使用
具体的代码如下：
#region Log helper public class LogMessage { public string CustomMessage { get; set; } public string Message { get; set; } public override string ToString() { return Message; } } internal class CustomMessageConverter : PatternLayoutConverter { protected override void Convert(TextWriter writer, log4net.Core.LoggingEvent loggingEvent) { var logMessage = loggingEvent.MessageObject as LogMessage; if (logMessage != null) { writer.Write(logMessage.CustomMessage); } } } internal class CustomLayout : PatternLayout { public CustomLayout() { this.AddConverter("CustomMessage", typeof(CustomMessageConverter)); } } public class CustAdoNetAppender : AdoNetAppender { string _connectiongStr = string.Empty; public new string ConnectionString { set { _connectiongStr = value; base.ConnectionString = _connectiongStr; } get { return base.ConnectionString; } } } #endregion
配置代码
<?xml version="1.0" encoding="utf-8" ?> <configuration> <configSections> <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net"/> </configSections> <log4net> <logger name="MyLogger"> <level value="ALL"></level> <appender-ref ref="ADONetAppender"></appender-ref> </logger> <!--记录日志到数据库--> <appender name="ADONetAppender" type="ConsoleApp.CustAdoNetAppender"> <bufferSize value="100" /> <connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" /> <connectionString value="data source=.;initial catalog=test;integrated security=false;persist security info=True;User ID=sa;Password=xxx" /> <commandText value="INSERT INTO Log ([Date],[Thread],[Level],[Logger],[Message],[CustomMessage]) VALUES (@log_date, @thread, @log_level, @logger, @message,@customMessage)" /> <parameter> <parameterName value="@log_date" /> <dbType value="DateTime" /> <layout type="log4net.Layout.RawTimeStampLayout" /> </parameter> <parameter> <parameterName value="@thread" /> <dbType value="String" /> <size value="255" /> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="%thread" /> </layout> </parameter> <parameter> <parameterName value="@log_level" /> <dbType value="String" /> <size value="50" /> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="%level" /> </layout> </parameter> <parameter> <parameterName value="@logger" /> <dbType value="String" /> <size value="255" /> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="%logger" /> </layout> </parameter> <parameter> <parameterName value="@message" /> <dbType value="String" /> <size value="4000" /> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="%message" /> </layout> </parameter> <parameter> <parameterName value="@customMessage" /> <dbType value="String" /> <size value="4000" /> <layout type="ConsoleApp.CustomLayout"> <conversionPattern value="%CustomMessage" /> </layout> </parameter> </appender> </log4net> </configuration>
SQL脚本如下：
CREATE TABLE [dbo].[Log] ( [ID] [int] IDENTITY (1, 1) NOT NULL , [Date] [datetime] NOT NULL , [Thread] [varchar] (255) NOT NULL , [Level] [varchar] (20) NOT NULL , [Logger] [varchar] (255) NOT NULL , [Message] [varchar] (4000) NOT NULL , [CustomMessage] VARCHAR(max) NULL ) ON [PRIMARY]
在AssemblyInfo.cs文件中添加一句
[assembly: log4net.Config.DOMConfigurator(ConfigFile = "Log4Net.xml", Watch = true)]
调用代码：
ILog log = LogManager.GetLogger("MyLogger");
log.Info(new LogMessage { Message = "message", CustomMessage = "cust" });
运行结果：