.netcore project using log4net

log4net configuration file

        The introduction of log4net package, create a config directory, designed to put the configuration file, add log4net.config file.

        Write configuration file.

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  
  <log4net>
    <!-- 错误日志类-->
    <logger name="errLog">
      <level value="ALL" />
      <appender-ref ref="ErrorAppender" />
    </logger>
    <!-- 错误日志附加介质-->
    <appender name="ErrorAppender" type="log4net.Appender.RollingFileAppender">
      <->Log file path is automatically created<-!
      param name = "File" value = "LogError the Log \\ \\"  /> 
      <-! whether to append log file -> 
      < param name = "AppendToFile" value = "to true"  /> 
      <! - the maximum number of backup log file -> 
      < param name = "MaxSizeRollBackups" value = "2"  /> 
      <-! maximum file size (KB / MB / GB) -> 
      < param name = "the MaxFileSize" value = "1MB "  /> 
      <! - log file name is to be fixed -> 
      <param name="StaticLogFileName" value= "to false"  /> 
      <-! log file name format: 2019-10-09.log -> 
      < param name = "DatePattern" value = "the MM-dd-YYYY & quot; .htm & quot;"  /> 
      <! - log rolling basis: mixed mode (file size and date) -> 
      < param name = "RollingStyle" value = "Composite"  /> 
      <-! information log layout -> 
      < layout of the type = "log4net.Layout. the PatternLayout " > 
        < param name =" ConversionPattern " value =" & lt; the HR COLOR = Red & gt;% N [Abnormal Time]:% d [% t] & lt; BR & gt;% n [Exception level:% - 5p & lt; BR & gt;% n% m & lt; BR & gt;% n & lt; HR Size = 1 & gt; "  />
      </layout>
    </appender>

    <!-- 信息日志 -->
    <logger name="infoLog">
      <level value="ALL" />
      <appender-ref ref="InfoAppender" />
    </logger>
    <!-- 信息日志附加介质-->
    <appender name="InfoAppender" type="log4net.Appender.RollingFileAppender">
      <param name="File" value="Log\\LogInfo\\" />
      <param name="AppendToFile" value="true" />
      <param name="MaxSizeRollBackups" value="2" />
      <param name="MaxFileSize" value="1024KB" />
      <param name="StaticLogFileName" value="false" />
      <param name="DatePattern" value="yyyy-MM-dd&quot;.htm&quot;" />
      <param name="RollingStyle" value="Composite" />
      <layout type="log4net.Layout.PatternLayout">
        <param name="ConversionPattern" value="&lt;HR COLOR=blue&gt;%n【日志时间】：%d [%t] &lt;BR&gt;%n【日志级别】：%-5p &lt;BR&gt;%n%m &lt;BR&gt;%n &lt;HR Size=1&gt;"  />
      </layout>
    </appender>
    
  </log4net>

  <!-- To customize the asp.net core module uncomment and edit the following section. 
  For more info see https://go.microsoft.com/fwlink/?linkid=838655 -->
  
  <system.webServer>
    <handlers>
      <remove name="aspNetCore"/>
      <add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModule" resourceType="Unspecified"/>
    </handlers>
    <aspNetCore processPath="%LAUNCHER_PATH%" arguments="%LAUNCHER_ARGS%" stdoutLogEnabled="false" stdoutLogFile=".\logs\stdout" />
  </system.webServer>
  
</configuration>

 

Log helper

        First, create a storage class

public class Log4NetRepository
{
    public static ILoggerRepository loggerRepository { get; set; }
}

    ///  <Summary> 
    /// log4net helper
     /// AdoNetAppender only supports the .net framework4.5, .net core does not support the project persisted to the database log
     ///  </ Summary> 
    public  class LogHelper 
    { 
        / / abnormality 
        Private  static  Readonly the ILog LogError = LogManager.GetLogger (Log4NetRepository.loggerRepository.Name, " LogError " );
         // record 
        Private  static  Readonly the ILog the loginfo = LogManager.GetLogger (Log4NetRepository.loggerRepository.Name, " the loginfo " ); 

        public  static  voidError ( String throwMsg, Exception EX) 
        { 
            String errorMsg = String .Format ( " [Description] Exception: {0} <br> [Type] Exception: {1} <br> [] exception information: {2} <br> call stack []: {}. 3 " , 
                 new new  Object [] { 
                    throwMsg, 
                    ex.GetType () the Name,. 
                    ex.Message, 
                    ex.StackTrace}); 
            errorMsg = errorMsg.Replace ( " \ R & lt \ n- " , " < br> " ); 
            logerror.Error (errorMsg);
        } 

        Public  static void Info ( String Message) 
        { 
            loginfo.Info ( String .Format ( " [] log information: {0} " , Message)); 
        } 

    }

        startup reference log4net , log4net.config , log4net.Repository . In such a configuration in the constructor startup:

public static ILoggerRepository repository { get; set; }

public Startup(IConfiguration configuration)
{
    Configuration = configuration;
    // log4net 仓储
    repository = LogManager.CreateRepository("CoreLogRepository");
    XmlConfigurator.Configure(repository, new FileInfo("config/log4net.config"));
    Log4NetRepository.loggerRepository = repository;
}

        Written before the global exception capture, you can now add such a sentence.

public class ApiExceptionFilter:ExceptionFilterAttribute
    {
        private IHostingEnvironment _env;
        public ApiExceptionFilter(IHostingEnvironment env)
        {
            _env = env;
        }

        public override void OnException(ExceptionContext context)
        {
            if (context.ExceptionHandled)
            {
                return;
            }
            LogHelper.Error(exMsg, context.Exception); // 日志记录
            var exMsg = context.Exception.Message;
            ApiResp resp = new new ApiResp (ApiRespCode.E999999, ExMSG);
             // development environment display abnormality information 
            IF (_env.IsDevelopment ()) 
            { 
                resp.Message = ExMSG; 
            } 
            context.Result = new new a JsonResult (RESP); 
            context.ExceptionHandled = to true ; 
        } 
    }

　　When an exception occurs, it will automatically create the Log \ LogError \ directory in the project directory, and written to a log file.