[求助]想把符合条件的多个图元都定位到地图中该怎么做

我现在只能定位一个图元，不能定位多个！附上我的代码，各位帮我看看！

IFeatureSelection pFeatSeln;
  pFeatLyr=(IFeatureLayer)this.axMapControl1.get_Layer(this.comboBox1.SelectedIndex);
  pFeatSeln=(IFeatureSelection)pFeatLyr;
  pFeatSeln.SelectFeatures(pQueryFltr,0,false);
  ISelectionSet pSelSet;
  pSelSet=pFeatSeln.SelectionSet;
  IFeatureCursor pFeatCursor;
  pFeatCursor=pFeatLyr.FeatureClass.Search(pQueryFltr,false);
  ICursor pCursor;
  pCursor=(ICursor)pFeatCursor;
  pSelSet.Search(pQueryFltr,true,out pCursor);
  IFeature pFeature;
  pFeature=pFeatCursor.NextFeature();
  IEnvelope pExtent;
  pExtent=pFeature.Shape.Envelope;
  this.axMapControl1.Extent =pFeature.Shape.Envelope;

求包含多个图元的最小矩，然后设置范围