NLog配置只保留三十个日志文件

<?xml version="1.0" encoding="utf-8" ?>
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      autoReload="true"
      internalLogLevel="Info"
    internalLogFile="${basedir}\log\internal-nlog.txt">

    <!-- the targets to write to -->
    <targets>
        <!-- write logs to file  -->
        <target xsi:type="File" name="allfile" fileName="${basedir}\logs\nlog-all-${shortdate}.log"
            maxArchiveFiles="30"
            layout="${longdate}|${event-properties:item=EventId_Id}|${uppercase:${level}} | [Class: ${logger}] | [Method: ${callsite}] | [Line: ${callsite-linenumber}] |${logger}|${message} ${exception:format=tostring}" >
        <default-parameters>
                <parameter name="maxArchiveFiles" value="15" />
            </default-parameters>
    </target>

        <!-- <target name="logconsole" -->
        <!--         xsi:type="Console" -->
        <!--         layout="${logLayout}"   /> -->
        <!-- -->

        <!-- another file log, only own logs. Uses some ASP.NET core renderers -->
        <target xsi:type="File" name="ownFile-web" fileName="${basedir}\logs\nlog-own-${shortdate}.log"
                layout="${longdate}|${event-properties:item=EventId_Id}|${uppercase:${level}}|${logger}|${message} ${exception:format=tostring}|url: ${aspnet-request-url}|action: ${aspnet-mvc-action}" >
        <default-parameters>
                <parameter name="maxArchiveFiles" value="15" />
            </default-parameters>
    </target>


      <target xsi:type="Console" name="console"
               layout="${longdate}|${event-properties:item=EventId_Id}|${uppercase:${level}} | [Class: ${logger}] | [Method: ${callsite}] | [Line: ${callsite-linenumber}] |${logger}|${message} ${exception:format=tostring}" />
      
      
    </targets>


    <!-- rules to map from logger name to target -->
    <rules>
        <!--All logs, including from Microsoft-->
        <logger name="*" minlevel="Debug" writeTo="allfile" />
        <logger name="*" minlevel="Debug" writeTo="console" />


        <!--
        <logger name="Microsoft.*" maxlevel="Info" final="true" />
        <logger name="System.Net.Http.*" maxlevel="Info" final="true" />

        -->

        <!-- <logger name="*" minlevel="Trace" writeTo="ownFile-web,logconsole" /> -->
    </rules>
</nlog>

 maxArchiveFiles="30" 是最关键参数