如何在没有属性的情况下记录消息 [英] How to log message without even properties

问题描述

我正在使用Nlog v4.6.7，并以以下布局(在Nlog.config中)呈现消息.

I am using Nlog v4.6.7 and render messages with the following layout (in Nlog.config).

 <layout xsi:type="JsonLayout" includeAllProperties="true">
      <attribute name="timestamp" layout="${date:universalTime=true:format=yyyy-MM-dd HH\:mm\:ss,fff}" />
      <attribute name="level" layout="${level}"/>
      <attribute name="message" layout="${message}" />
 </layout>

典型的日志记录是_logger.Info("Start {job} with {@data}", job, new {a,b,c});

我使用includeAllProperties选项，因为每条消息可能定义了不同的属性，因此我不能一一预先将它们作为布局的属性包括在内.

I use the includeAllProperties option since each message may define different properties and I cannot pre-include them one by one as attributes in the layout.

上面要打印的内容类似于:

What ends to be printed by the above is something like:

{ "timestamp": "2019-09-06 13:13:40,386", "level": "Info", "message": "Start \"SomeJobType\" with {\"a\":\"aa\", \"b\":\"bb\", \"c\":\"cc\"}", "job": "SomeJobType", "data": { "a": "aa", "b": "bb", "c": "cc" } }

是否有办法取消从事件属性打印的消息?因此， 实现类似

Is there a way to disengage the message printed from the event-properties? Thus, achieve something like

{ "timestamp": "2019-09-06 13:13:40,386", "level": "Info", "message": "Start action", "job": "SomeJobType", "data": { "a": "aa", "b": "bb", "c": "cc" } }

${message:raw=true}并没有帮助，因为它像

The ${message:raw=true} does not help since it prints the placeholders like

{ "timestamp": "2019-09-06 13:13:40,386", "level": "Info", "message": "Start {job} with {@data}", "job": "SomeJobType", "data": { "a": "aa", "b": "bb", "c": "cc" } }

推荐答案

您始终可以执行以下操作:

You can always do this:

var logger = NLog.LogManager.GetCurrentClassLogger();
var theEvent = new NLog.LogEventInfo(NLog.LogLevel.Info, null, "Start action");
theEvent.Properties["job"] = job;
theEvent.Properties["data"] = new {a,b,c};
logger.Log(theEvent);

然后在 JsonLayout 上配置MaxRecursionLimit=1:

 <layout xsi:type="JsonLayout" includeAllProperties="true" maxRecursionLimit="1">
      <attribute name="timestamp" layout="${date:universalTime=true:format=yyyy-MM-dd HH\:mm\:ss,fff}" />
      <attribute name="level" layout="${level}"/>
      <attribute name="message" layout="${message}" />
 </layout>

另请参阅: https://github.com/NLog/NLog/wiki/EventProperties-Layout-Renderer

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