[英]log4net - Custom property logging
I got use the following class to print out messages using log4net: 我使用以下类使用log4net打印出消息:
public class Message
{
public String Text { get; set; }
public int Id { get; set; }
public override string ToString()
{
return Text;
}
}
I use Logger.Info(MessageInstance)
, so log4net just invokes the ToString
method and prints out the message. 我使用
Logger.Info(MessageInstance)
,所以log4net只是调用ToString
方法并打印出消息。 I would like to also log the Id
property of the message object, but I cannot figure out how to achive this. 我也想记录消息对象的
Id
属性,但是我不知道该如何实现。
My conversion pattern looks similiar to this: 我的转换模式与此类似:
<conversionPattern value="%date %-5level %message%newline" />
I tried adding %message{Id}
but that would just print the whole message twice. 我尝试添加
%message{Id}
但这只会将整个消息打印两次。
Any Suggestions? 有什么建议么?
I just wrote a custom pattern, which allows to read properies of the message object. 我刚刚编写了一个自定义模式,该模式允许读取消息对象的属性。
public class ReflectionReader : PatternLayoutConverter
{
public ReflectionReader()
{
_getValue = GetValueFirstTime;
}
protected override void Convert(TextWriter writer, LoggingEvent loggingEvent)
{
writer.Write(_getValue(loggingEvent.MessageObject));
}
private Func<object, String> _getValue;
private string GetValueFirstTime(object source)
{
_targetProperty = source.GetType().GetProperty(Option);
if (_targetProperty == null)
{
_getValue = x => "<NULL>";
}
else
{
_getValue = x => String.Format("{0}", _targetProperty.GetValue(x, null));
}
return _getValue(source);
}
private PropertyInfo _targetProperty;
}
Combine with this: 与此结合:
public class ReflectionLayoutPattern : PatternLayout
{
public ReflectionLayoutPattern()
{
this.AddConverter("item", typeof(ReflectionReader));
}
}
Config looks like this: 配置看起来像这样:
<layout type="MyAssembly.MyNamespace.ReflectionLayoutPattern, MyAssembly">
<conversionPattern value="[%item{Id}]	%message%newline" />
</layout>
You can use a CustomXmlLayout class that derives from XmlLayoutBase and override the FormatXml method. 您可以使用从XmlLayoutBase派生的CustomXmlLayout类,并重写FormatXml方法。 This method takes a LoggingEvent object as parameter which will contain the MessageObject that was passed to the log method.
此方法将LoggingEvent对象作为参数,该对象将包含传递给log方法的MessageObject。
public class SpecialXmlLayout : XmlLayoutBase
{
protected override void FormatXml(XmlWriter writer, LoggingEvent loggingEvent)
{
Message message = loggingEvent.MessageObject as Message;
writer.WriteStartElement("LoggingEvent");
writer.WriteElementString("Message", GetMessage(message));
// ... write other things
writer.WriteEndElement();
}
}
Inside the GetMessaage method create your string as you would like from the message. 在GetMessaage方法内,根据您希望从消息中创建字符串。
Then use this layout class in log4net config: 然后在log4net配置中使用此布局类:
<log4net>
<appender name="EventLogAppender" type="log4net.Appender.EventLogAppender">
<applicationName value="My Application" />
<layout type="Namespace.SpecialXmlLayout">
</layout>
<filter type="log4net.Filter.LevelRangeFilter">
<param name="LevelMin" value="ERROR" />
<param name="LevelMax" value="FATAL" />
</filter>
</appender>
</log4net>
This is the idea. 这是主意。 For more specific details you will have to consult the log4Net SDK documentation.
有关更多特定的详细信息,您将必须查阅log4Net SDK文档。
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