NLog Truncate语法

Question

我正在为UiPath更改NLog.config文件。我想将截断值增加到20000，并且我尝试了下面的语法，但它不起作用。

<variable name="truncated_message" value="${replace:replaceWith=...TRUNCATED:regex=true:inner=${message}:searchFor=^[\s\S]{20000}}"/>
<target type="File" name="WorkflowLogFiles" fileName="${WorkflowLoggingDirectory}/${shortdate}_Execution.log" layout="${time} ${level} ${truncated_message}" keepFileOpen="true" openFileCacheTimeout="5" concurrentWrites="true" encoding="utf-8" writeBom="true" />

我也尝试过使用正则表达式，但它们对我不起作用

(^(?:\S+\s+\n?){0, 20000}) 
(?\=.\{20000\}).+

有人能告诉我我做错了什么吗?如何将截断值设置为20000？

Answer 1

这对我来说很有效：

<nlog>
   <variable name="truncated_message_new" value="${message:truncate=20000}" />
   <variable name="truncated_message_old" value="${trim-whitespace:inner=${message:padding=-20000:fixedLength=true}}" />

   <targets>
      <target type="File" name="WorkflowLogFiles" fileName="C:\temp\nlog/${shortdate}_Execution.log" layout="${time} ${level} ${truncated_message_old}" keepFileOpen="true" openFileCacheTimeout="5" concurrentWrites="true" encoding="utf-8" writeBom="true" />
   </targets>

  <rules>
    <logger name="*" minlevel="Trace" writeTo="WorkflowLogFiles" />
  </rules>
</nlog>

仅节省20000个字符：

var test = string.Empty.PadLeft(40000, '*');
NLog.LogManager.GetLogger("test").Info("Doing hard work! {Action}", test);