使用运算符“<”时 NLog 中断

Question

我有下面的配置，关系运算符“<”似乎没有转义，因为它输出错误 XML element is not closed。 In documentation 他们有一个带有“<=”的示例，但它也不起作用。有趣的是，'>' 工作正常。我错过了什么吗？

<logger name="*" minlevel="Trace" writeTo="logFile">
  <filters>
    <when condition="contains('${logger}','Domain.Messaging.') and level < LogLevel.Warn" action="Ignore" />
  </filters>
</logger>

Answer 1

Am I missing something?

是的，您没有考虑到这是 XML，其中 < 需要转义。你想要：

<logger name="*" minlevel="Trace" writeTo="logFile">
  <filters>
    <when condition="contains('${logger}','Domain.Messaging.') and level &lt; LogLevel.Warn" action="Ignore" />
  </filters>
</logger>

来自 XML 1.0 specification 的第 2.4 节：

The ampersand character (&) and the left angle bracket (<) must not appear in their literal form, except when used as markup delimiters, or within a comment, a processing instruction, or a CDATA section. If they are needed elsewhere, they must be escaped using either numeric character references or the strings & and < respectively.

使用运算符“<”时 NLog 中断

NLog breaks when using operator '<'

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