public override void BeginIteration(TraceEvent beginEvent)
 {
     _objects = new ListMetricInfo();
     _objects.clear();
     _objects.hasCount = true;
     _objects.hasBytes = true;
 }
 public override object EndIteration(TraceEvent endEvent)
 {
     var ret = _objects;
     _objects = null;
     return ret;
 }
 public override void BeginIteration(TraceEvent beginEvent)
 {
     _objects = new ListMetricInfo();
     _objects.clear();
 }