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Question

考慮延長FilterSkeleton與屬性名稱MYNAME和擴展ApenderSkeleton

一個appender類過濾屬性有可能得到它接受了過濾器的MYNAME財產這條消息在appender的Append方法中？

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

} 

Answer 1

可以重寫FilterEvent方法保存接受消息的過濾器，然後在Append檢索：

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 
     } 
    } 
}