当我的布局以${pad...}开始时，为什么NLog不产生任何输出？

Question

考虑NLog.config中的以下配置文件

<?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">

  <!-- 
  See https://github.com/nlog/nlog/wiki/Configuration-file 
  for information on customizing logging rules and outputs.
   -->
  <targets async="true">
    <target xsi:type="Trace" name="DebugView"
            rawWrite="true"
            layout="NEX|${pad:padding=-5:inner=${uppercase:${level}}}|${pad:padding=-16:inner=${callsite:className=true:fileName=false:includeSourcePath=false:methodName=false:includeNamespace=false}}|${message}" />
    <target xsi:type="File" name="LogFile"
            filename="${environment:variable=UserProfile}/logs/TA.Nexdome.Server-${filesystem-normalize:fSNormalize=true:inner=${shortdate}-${windows-identity}-${machinename}.log}"
            layout="${time}|${pad:padding=-5:inner=${uppercase:${level}}}|${pad:padding=-16:inner=${callsite:className=true:fileName=false:includeSourcePath=false:methodName=false:includeNamespace=false}}|${message}" />
  </targets>
  <rules>
    <logger name="*" minlevel="Trace" writeTo="DebugView" />
    <logger name="*" minlevel="Trace" writeTo="LogFile" />
  </rules>
</nlog>

对于目标name="DebugView"，如果我修改布局定义以从开头删除文字文本NEX|，那么我根本得不到任何输出。

如果我把任何东西放在${pad前面，即使只有一个|，我也会得到输出。

这会不会是布局逻辑中的一个bug？

Answer 1

适用于我的演示案例，请参阅https://github.com/304NotModified/NLog-Demo-cases/tree/master/PadOutput

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