如何在NLog布局模式中使某个块可选? [英] How to make a certain piece optional in a NLog layout pattern?

问题描述

我有一个名为 job 的自定义布局渲染器.它提供了几项，在我们的app.config中像这样使用:

I have a custom layout renderer named job. It provides several items, which are used like this in our app.config:

<variable name="jobHost" value = "${job:item=host}" />
<variable name="jobService" value = "${job:item=service}" />
<variable name="jobNS" value = "${job:item=ns}" />
<variable name="jobName" value = "${job:item=name}" />
<variable name="jobKind" value = "${job:item=kind}" />
<variable name="jobScheduleId" value = "${job:item=scheduleId}" />
<variable name="jobLayout" value = "[H:${jobHost} S:${jobService} NS:${jobNS} N:'${jobName}' K:${jobKind} S:${jobScheduleId}]" />
<variable name="layout" value = "${longdate} [${threadid}] ${machinename} ${jobLayout} ${uppercase:inner=${level}} ${logger} - ${message} ${onexception:${newline}${exception:format=ToString:innerFormat=ToString:maxInnerExceptionLevel=2}}" />
<targets>
    <target name="ThreadLog" xsi:type="ThreadSpecificTarget" />
    <target xsi:type="SplitGroup" name="AllTargets">
        <target name="TextFile" xsi:type="File" fileName="C:\Log\QuartzBackgroundEngine.txt" layout="${layout}"/>
        <target name="Console" xsi:type="ColoredConsole" layout="${layout}"/>
    </target>
</targets>

当布局渲染器确定没有可用的特定于作业的数据时，日志消息将包含字符串[H: S: NS: N:'' K: S:].我要排除它.

When the layout renderer decides that there is no job specific data available, then log messages contain the string [H: S: NS: N:'' K: S:]. I want to exclude it.

因此，我尝试用${jobLayout:when=jobName!=’’}替换${jobLayout}，但是它不起作用，因为NLog认为jobLayout应该对应于布局渲染器，而不是变量，在这种情况下.

So, I tried to replace ${jobLayout} with ${jobLayout:when=jobName!=’’}, but it does not work, because NLog thinks that jobLayout should correspond to a layout renderer, rather than a variable, which is the case here.

如何更改布局，以便仅在${jobName}不为空的情况下包含${jobLayout}?

How can I change my layout so that ${jobLayout} is only included if ${jobName} is not empty?

推荐答案

我遇到了类似的问题，当变量不为空时，我想显示一些特殊的格式.

I ran into a similar problem where I wanted to make to display some special formatting when a variable was not empty.

我从最有用的NLog配置

${when:when=length('${jobName}') > 0:inner=${jobLayout}}

${when:when=length('${jobName}') > 0:inner=${jobLayout}}

我不确定这是否能使您100％达到目标，但这是朝正确方向迈出的一步.

I'm not sure if this will get you 100% there, but it is a step in the right direction.

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