如果应用程序崩溃/异常关闭，则在具有数据库目标的BufferingWrapper之上的Nlog AutoFlushWrapper会丢失缓冲区中的日志

Question

I am using Nlog AutoFlushWrapper on top of AutoFlushWrapper which has database target with fallback to file target, currently i have buffer size of 50 along with flushtimeout to 2 minutes but if the application crashes/closes abnormally then the logs in buffer aren't logged.

eg Nlog has 10 logs in buffer and application crashes then those logs aren't flushed.

Can anyone help me in this?

Here is the small snippet of the code

<target name="main" xsi:type="AutoFlushWrapper" asyncFlush="true" OptimizeBufferReuse="true">
  <target name="database_buffer" xsi:type="BufferingWrapper" bufferSize="50" flushTimeout="120000" OptimizeBufferReuse="true">
    <target xsi:type="FallbackGroup" name="String" returnToFirstOnSuccess="true">
      <target xsi:type="Database" name="database_inner" connectionString="${event-context:item=dbConnectionString}"
              commandText="INSERT INTO [Log] ([Level],[Message],[Application],[MethodInfo],[Exception]) VALUES(@Level,@Message,@ApplicationName,@MethodInfo,@Exception)">
        <parameter name="@Level" layout="${level:uppercase=true}"/>
        <parameter name="@Message" layout="${event-context:item=Message}"/>
        <parameter name="@ApplicationName" layout="${event-context:item=SourceName}"/>
        <parameter name="@MethodInfo" layout="${event-context:item=MethodInfo}"/>
        <parameter name="@Exception" layout="${event-context:item=Exception}"/>
      </target>
      <target xsi:type="File"
              name="fallback"
              fileName="${basedir}Logs\Log.log"
              archiveAboveSize="10485760"
              archiveFileName="${basedir}\Logs\Archive\Log_{####}.log"
              archiveNumbering="Sequence"
              concurrentWrites ="false"
              maxArchiveFiles ="10"
              layout="Date: ${longdate}${newline}
          ApplicationName: ${event-context:item=SourceName}${newline}
          Level: ${level:uppercase=true}${newline}
          MethodInfo: ${event-context:item=MethodInfo}${newline}
          Message: ${event-context:item=Message}${newline}
          Exception: ${event-context:item=Exception}${newline}${newline}" />
    </target>
  </target>
</target>

Answer 1

if the application crashes/closes abnormally then the logs in buffer aren't logged.

Sounds a bit unwanted to let the program crash itself, but it would recommend a NLog.LogManager.Shutdown(); in the finally .

eg

class Program
{
    static void Main(string[] args)
    {
        try
        {
            //do something
        }

        finally
        {
            // Ensure to flush and stop internal timers/threads before application-exit (Avoid segmentation fault on Linux)
            NLog.LogManager.Shutdown();
        }
    }
}