NLog:如何控制LogEventInfo对象中消息的格式? [英] NLog: How do I control the format of a message from a LogEventInfo object?

问题描述

我是NLog的新手，并且一直在使用LogEventInfo对象，因为我认为我的应用程序中将需要它们.我创建了一个带有纯文本字符串的LogEventInfo对象，然后使用设置为写入$ {message}的FileAppender调用Logger.Debug(myEventInfoObject).在我希望看到我的文本字符串的地方，我看到的是记录器名称，消息级别，消息和序列ID.我发现那个扩展的字符串是我调用myEventInfoObject.ToString()时得到的.当$ {message}来自LogEventInfo对象时，如何控制显示的内容?

I'm new to NLog, and I've been playing with LogEventInfo objects, since I think I'll need them in my application. I created a LogEventInfo object with a plain text string, and then I called Logger.Debug(myEventInfoObject), using a FileAppender set up to write ${message}. Where I expected to see my text string, I saw instead the logger name, the message level, the message, and the sequence ID. I found that that expanded string is what I get when I call myEventInfoObject.ToString(). How can I control what appears when ${message} comes from a LogEventInfo object?

这是我的配置文件:

<?xml version="1.0" encoding="utf-8" ?>
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      throwExceptions="true">
  <targets>
    <target name="file" xsi:type="File" layout="${longdate}  ${logger}  ${message}" fileName="${basedir}/nlog_sample_file.txt" />
  </targets>

  <rules>
    <logger name="*" minlevel="Debug" writeTo="file" />
  </rules>
</nlog>

这是我的代码生成日志:

Here's my code generating the log:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using NLog;

namespace NLogSample
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                Logger logger = LogManager.GetCurrentClassLogger();
                LogEventInfo theEvent = new LogEventInfo(LogLevel.Debug, "", "This message from the LogInfoEvent will not be used.");
                theEvent.Properties["Message"] = "This message from the LogInfoEvent Message property will be used.";

                logger.Debug(theEvent);
                logger.Debug("Does the sequence ID show up in this message?");

                string formattedMessage = theEvent.FormattedMessage;
                string eventString = theEvent.ToString();
            }
            catch (Exception ex)
            {
                int a = 1;
            }
        }
    }
}

最后，这是一条消息示例:

Finally, here is a sample of the message:

2014-10-08 10:14:13.5525 NLogSample.Program日志事件:Logger =''Level = Debug Message ='将不使用LogInfoEvent中的此消息.' SequenceID = 2

2014-10-08 10:14:13.5525 NLogSample.Program Log Event: Logger='' Level=Debug Message='This message from the LogInfoEvent will not be used.' SequenceID=2

我正在Win7 Pro计算机上使用Visual Studio 2012.

I am working in Visual Studio 2012 on a Win7 Pro machine.

非常感谢！

RobR

推荐答案

我必须这样做

    class MyLogEventInfo : LogEventInfo {
        public override string ToString() {
            return base.FormattedMessage;
        }
    }

...

    var theEvent = new MyLogEventInfo();
    theEvent.Message = "This message from the LogInfoEvent will not be used.";
    logger.Debug(theEvent);

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