log4net筛选器-如何编写AND筛选器以忽略日志消息 [英] log4net filter - how to write AND filter to ignore log messages

问题描述

我正在努力在log4net中编写AND条件过滤器.如果是nLog，我可以这样写:

I am struggling to write an AND conditional filter in log4net. Had it been nLog, I could have written it this way:

<logger name="*" minlevel="Info" xsi:type="NLogLoggerRule" writeTo="FooLogger" >
  <filters>
    <when condition="equals('${event-context:item=UserID}', 'TESTUSER') 
                 and equals('${event-context:item=URL}','/foo/foobar.aspx')" 
          action="Ignore" />
  </filters>
</logger>

我不确定如何在log4net中编写相同的过滤器.到目前为止，我已经成功地编写了一个条件:

I am not sure how to write the same filter in log4net. I have been so far successful, in writing a single condition:

<appender>
   ....
   <filter type="log4net.Filter.PropertyFilter">
      <key value="URL" />
      <stringToMatch value="/foo/foobar.aspx" />
      <acceptOnMatch value="false" />
   </filter>
</appender>

如何使用log4net过滤器编写AND条件?请帮忙.

How can I write AND conditions using log4net filters? Please help.

推荐答案

支持AND条件的自定义过滤器.此类公开了Filter属性，因此可以在此处使用现有的log4net过滤器，并且如果需要，也可以具有嵌套的AND条件.

A custom filter supporting AND conditions. This class exposes Filter property so existing log4net filters can be used here and also one can have nested AND conditions if required.

public class AndFilter : FilterSkeleton
{
    private bool acceptOnMatch;
    private readonly IList<IFilter> filters = new List<IFilter>();

    public override FilterDecision Decide(LoggingEvent loggingEvent)
    {
        if (loggingEvent == null)
            throw new ArgumentNullException("loggingEvent");

        foreach(IFilter filter in filters)
        {
            if (filter.Decide(loggingEvent) != FilterDecision.Accept)
                return FilterDecision.Neutral; // one of the filter has failed
        }

        // All conditions are true
        if(acceptOnMatch)
            return FilterDecision.Accept;
        else
            return FilterDecision.Deny;
    }

    public IFilter Filter 
    { 
        set { filters.Add(value); }
    }

    public bool AcceptOnMatch
    {
        get { return acceptOnMatch;}
        set { acceptOnMatch = value;}
    }
}

配置:

<filter type="Namespace.AndFilter, Assembly">
  <filter type="log4net.Filter.PropertyFilter">
    <key value="URL" />
    <stringToMatch value="/foo/foobar.aspx" />
  </filter>
  <filter type="log4net.Filter.PropertyFilter">
    <key value="UserID" />
    <stringToMatch value="TESTUSER" />
  </filter>
  <acceptOnMatch value="false" />
</filter>

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