查询亚洲范围内人口等级（POP_RANK）为5的所有城市（针对示例数据World.mxd）

MainForm.cs

        //省略若干其他代码

        private void menuSpatialIntersect_Click(object sender, EventArgs e)
        {
            //get the continent layer
            IFeatureLayer continentLayer = GetLayerByName("Continents", axMapControl1.Map) as IFeatureLayer;

            //query the continents layer where its name equals 'asia'
            //get the feature's geometry matching the above condition
            IQueryFilter queryFilter = new QueryFilterClass();
            queryFilter.WhereClause = "CONTINENT='Asia'";
            IFeatureCursor cursor = continentLayer.FeatureClass.Search(queryFilter, false);
            IGeometry intersectGeomtry = cursor.NextFeature().Shape;

            //get city layer
            //do spatial query where it is intersected with the geometry and pop_rank =5
            IFeatureLayer cityLayer = GetLayerByName("World Cities", axMapControl1.Map) as IFeatureLayer;
            ISpatialFilter spatialFilter = new SpatialFilter();
            spatialFilter.WhereClause = "POP_RANK=5";
            spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects;
            spatialFilter.Geometry = intersectGeomtry;

            //highlight by SelectionSet
            IFeatureSelection featureSelection = cityLayer as IFeatureSelection;
            featureSelection.SelectFeatures(spatialFilter, esriSelectionResultEnum.esriSelectionResultNew, false);

            //partial refresh
            axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeoSelection, intersectGeomtry, null);
        }

        private ILayer GetLayerByName(String layerName, IMap map)
        {
            ILayer layer = null;
            for (int i = 0; i < map.LayerCount; i++)
            {
                if (map.get_Layer(i).Name == layerName)
                {
                    layer = map.get_Layer(i);
                    break;
                }
            }
            return layer;
        }