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Question

考虑延长FilterSkeleton与属性名称MYNAME和扩展ApenderSkeleton

一个appender类过滤属性有可能得到它接受了过滤器的MYNAME财产这条消息在appender的Append方法中？

protected override void Append(LoggingEvent loggingEvent) 
{ 
    //sudo 
    var somename = acceptedfilter.MyName; 

} 

Answer 1

可以重写FilterEvent方法保存接受消息的过滤器，然后在Append检索：

public class FilteredAppender : AppenderSkeleton 
{ 
    private IFilter filter; 

    protected override bool FilterEvent(LoggingEvent loggingEvent) 
    { 
     IFilter f = this.FilterHead; 

     while (f != null) 
     { 
      if (f.Decide(loggingEvent) == FilterDecision.Accept) 
      { 
       filter = f; // Set the filter field 
       break; 
      } 

      f = f.Next; 
     } 

     return base.FilterEvent(loggingEvent); 
    } 

    protected override void Append(LoggingEvent loggingEvent) 
    { 
     NamedFilter acceptedfilter = filter as NamedFilter;    

     if (acceptedfilter!= null) 
     { 
       var somename = acceptedfilter.MyName; 
       // etc 
     } 
    } 
}