ArcEngine中清除选择集刷新问题

应该在清除前后各刷新一次。IFeatureSelection.Clear()和IMap.ClearSelection()都是一样的方法。 

///<summary>Clear the selected features in the IActiveView for a specified IFeatureLayer.</summary>
/// 
///<param name="activeView">An IActiveView interface</param>
///<param name="featureLayer">An IFeatureLayer</param>
/// 
///<remarks></remarks>
public void ClearSelectedMapFeatures(ESRI.ArcGIS.Carto.IActiveView activeView, ESRI.ArcGIS.Carto.IFeatureLayer featureLayer)

{

 if(activeView == null || featureLayer == null)

 {    return;  }

 ESRI.ArcGIS.Carto.IFeatureSelection featureSelection = featureLayer as  ESRI.ArcGIS.Carto.IFeatureSelection; 

// Dynamic Cast

// Invalidate only the selection cache. Flag the original selection

activeView.PartialRefresh(ESRI.ArcGIS.Carto.esriViewDrawPhase.esriViewGeoSelection, null, null);
 // Clear the selection  featureSelection.Clear();

 // Flag the new selection  activeView.PartialRefresh(ESRI.ArcGIS.Carto.esriViewDrawPhase.esriViewGeoSelection, null, null);

}