Second appender in log4net not working

Question

I have the following in my web.config:

<log4net>
    <appender name="mainLog"
       type="log4net.Appender.FileAppender">
      <file value="Log/Log.txt" />
      <appendToFile value="true" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%newline%date [%thread] %-5level %logger - %message%newline" />
      </layout>
    </appender>
    <appender name="linqLog"
      type="log4net.Appender.FileAppender">
      <file value="Log/Log.txt" />
      <appendToFile value="true" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%message%newline" />
      </layout>
    </appender>

    <logger name="MainLogger">
      <level value="ALL" />
      <appender-ref ref="mainLog" />
    </logger>
    <logger name="LinqLogger">
      <level value="ALL" />
      <appender-ref ref="linqLog" />
    </logger>
  </log4net>

The first appender called "mainLog" is working. But the second one called "linqLog" is not. If I comment out "mainLog", then "linqLog" works.

In my Global.asax file I have the following:

protected void Application_Start(object sender, EventArgs e)
        {
            XmlConfigurator.Configure();
        }

Here is how I am calling them:

public static void LogMessage(string message, string loggerName)
        {
            ILog log = LogManager.GetLogger(loggerName);
            log.Info(string.Format(message));
        }


LogMessage("My test message for MainLogger", "MainLogger");
LogMessage("My test message for LinqLogger", "LinqLogger");

Any ideas what I've done wrong?

Answer 1

Two file appenders cannot log to the same file, unless you specify a lockingModel

<lockingModel type="log4net.Appender.FileAppender+MinimalLock" />

See http://logging.apache.org/log4net/release/config-examples.html

Answer 2

Log4net支持两个写入同一文件的appender，但您需要将锁定模型设置为“MinimalLock”。

<lockingModel type="log4net.Appender.FileAppender+MinimalLock" />