覆盖现有的日志文件

Question

How to "overwrite existing log file" ??? I have tried to set attribute property <appendToFile value="false" /> . but still log file is not getting overwrite. My config file setting is as follow:

  <log4net>
    <root>
      <level value="DEBUG" />
      <appender-ref ref="LogFileAppender" />
    </root>
    <appender name="LogFileAppender" type="log4net.Appender.RollingFileAppender" >
      <file value="Content/log.txt" />
      <appendToFile value="false" />
      <threshold value="ON" />
      <rollingStyle value="Size" />
      <maxSizeRollBackups value="10" />
      <maximumFileSize value="10MB" />
      <staticLogFileName value="false" />
      <layout type="log4net.Layout.PatternLayout">
        <param name="ConversionPattern" value="%-5p%d{yyyy-MM-dd hh:mm:ss} – %m%n" />
      </layout>
    </appender>
  </log4net>

please let me know where i am doing mistake.

Answer 1

I think you might want to use the FileAppender rather than the RollingFileAppender. It allows you to overwrite the existing file.

http://logging.apache.org/log4net/release/sdk/log4net.Appender.FileAppender.html

<appender name="FileAppender" type="log4net.Appender.FileAppender">
    <file value="Content/log.txt" />
    <appendToFile value="false" />
    <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
    </layout>
</appender>

Set appendToFile to false

The following shows how to write the rollingapender file once per execution, but it will still create a new file per execution:

From the examples page

<appender name="LogFileAppender" type="log4net.Appender.RollingFileAppender">
    <file value="Content/log.txt" />
    <appendToFile value="false" />
    <rollingStyle value="Size" />
    <maxSizeRollBackups value="-1" />
    <maximumFileSize value="10MB" />
    <layout type="log4net.Layout.PatternLayout">
        <param name="ConversionPattern" value="%-5p%d{yyyy-MM-dd hh:mm:ss} – %m%n" />
    </layout>
</appender>

Answer 2

Try to use this:

<param name="AppendToFile" value="false" />
<rollingStyle value="Size" />
<maxSizeRollBackups value="0" />
<staticLogFileName value="true" />

This config will overwrite the existing log file.

Answer 3

Is overwriting the existing file means you want to keep writing to the same file (like a circular buffer)? If so,

1) You should set maxSizeRollBackups=0.

2) You should also set appendToFile = true

Please try and let us know of your results