当布局渲染输出为空时，防止NLog渲染内部文本 [英] Prevent NLog from rendering inner text when layout render output is empty

问题描述

我将NLog错误电子邮件文本的内容放入文件中，并使用FileContents渲染器进行渲染.我想做的是，如果布局渲染器产生一个空字符串，则隐藏html输出的某些部分

I put the contents of my NLog error email text into a file and render it using a a FileContents renderer. What I'd like to do is hide certain parts of html output if a layout renderer produces an empty string

<div>Request ticket: ${httpContextItems:key=RequestTicket}</div>

我不确定条件/属性时的语法.这里有一些尝试:

I am not sure of the syntax of the when condition/property. Here are some attempts:

${httpContextItems:key=RequestTicket:when:length>0}
   <div>Request ticket: ${httpContextItems:key=RequestTicket}</div>
${??? How to enclose? }

NLog不喜欢这种嵌套的东西:

And NLog doesn't like this nested stuff:

${when:when=length(${httpContextItems:key=RequestTicket})=0:inner=<div>Request ticket: ${httpContextItems:key=RequestTicket}</div>}

推荐答案

NLog不喜欢这种嵌套的东西:

And NLog doesn't like this nested stuff:

${when:when=length(${httpContextItems:key=RequestTicket})=0:inner=<div>Request    ticket: ${httpContextItems:key=RequestTicket}</div>}

由于冒号，这是NLog中的错误.从NLog 4.2开始，此操作现在应该起作用，因此解决方案是升级NLog.请参阅此问题在GitHub上

This was a bug in NLog due to the colon. This should work now since NLog 4.2, so the solution is, upgrade NLog. See this issue on GitHub

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