[英]NLog layout renderers don't seem to work in configuration
Using ASP.NET v4.7.2, in nlog.config
I have this target:使用 ASP.NET v4.7.2,在nlog.config
我有这个目标:
<target name="logfile" xsi:type="File" fileName="{gdc:item=logFileName}" layout="${longdate}|${event-properties:item=EventId_Id}|${uppercase:${level}}|${logger}|${message} ${exception:format=tostring}"/>
In Global.asax.cs:Application_Start
I have this:在Global.asax.cs:Application_Start
我有这个:
GlobalDiagnosticsContext.Set("logFileName", @"c:\\Temp\\nlog-all-${shortdate}.txt");
And just for good measure:只是为了更好的衡量:
LogManager.Configuration = LogManager.Configuration.Reload();
Putting a breakpoint on the line immediately following, and digging into the LogManager.Configuration
properties, I find that the File
log target has this for its FileName
property:在紧随其后的行上放置一个断点,并深入研究LogManager.Configuration
属性,我发现File
日志目标的FileName
属性具有此属性:
FileName="{gdc:item=logFileName}"
When I write to the logger, it creates a file in the application root called--you guessed it-- {gdc:item=logFileName}
.当我写入记录器时,它会在应用程序根目录中创建一个名为 - 你猜对了 - {gdc:item=logFileName}
。
In the Command window, at a breakpoint immediately following the GDC set, I executed the null log action recommended by Mr Kristensen in his answer:在命令窗口中,在 GDC 设置之后的断点处,我执行了 Kristensen 先生在他的回答中推荐的空日志操作:
((NLog.Targets.FileTarget)LogManager.Configuration.AllTargets[1]).FileName.Render(NLog.LogEventInfo.CreateNullEvent())
The result was {gdc:item=logFileName}
结果是{gdc:item=logFileName}
In other words, it looks like the GDC layout renderer isn't working.换句话说,看起来 GDC 布局渲染器不起作用。
What am I doing wrong here?我在这里做错了什么?
Works as intended.按预期工作。 FileName-property is a NLog Layout. FileName-property 是一个 NLog 布局。 Means it can resolve its value dynamically depending on LogEvent.意味着它可以根据 LogEvent 动态解析其值。 When looking at the FileName-property using the debugger then you are not providing a LogEvent.使用调试器查看 FileName 属性时,您没有提供 LogEvent。
Try doing this in a debug-watch (Remember to correct {gdc}
to ${gdc}
)尝试在调试监视中执行此操作(记住将{gdc}
更正为${gdc}
)
fileTarget.FileName.Render(NLog.LogEventInfo.CreateNullEvent());
NLog Layout engine allows you to capture all kind of context-information, without adding it to the actual LogEvent. NLog 布局引擎允许您捕获所有类型的上下文信息,而无需将其添加到实际的 LogEvent。 But can also extract context from the LogEvent .但也可以从 LogEvent 中提取上下文。
See also https://nlog-project.org/config/?tab=layout-renderers and https://nlog-project.org/config/?tab=layouts另见https://nlog-project.org/config/?tab=layout-renderers和https://nlog-project.org/config/?tab=layouts
But ${gdc}
is intended for global-variables and not for embedding layout-renderers.但是${gdc}
用于全局变量而不是用于嵌入布局渲染器。 Instead you could configure like this:相反,您可以这样配置:
<target name="logfile" xsi:type="File" fileName="${gdc:item=logDirectory}/nlog-all-${shortdate}.txt" ... />
And assign the GDC variable like this:并像这样分配 GDC 变量:
GlobalDiagnosticsContext.Set("logDirectory", @"c:\\Temp");
If you absolutely need layout-renderer logic embedded in the value, then you should consider using ${var} instead of ${gdc}
.如果您绝对需要在值中嵌入布局渲染器逻辑,那么您应该考虑使用${var}而不是${gdc}
。
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