学步园

AE 点选查询 
        IMap pMap = axMapControl1.Map;
            IActiveView pActiveView = pMap as IActiveView;
            IFeatureLayer pFeatureLayer = pMap.get_Layer(0) as IFeatureLayer;
            IFeatureClass pFeatureClass = pFeatureLayer.FeatureClass;

            //设置点击点的位置
            IPoint point = pActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(e.x, e.y);
            ITopologicalOperator pTOpo = point as ITopologicalOperator;
            double length;
            length = ConvertPixelsToMapUnits(pActiveView, 4);
            IGeometry pBuffer = pTOpo.Buffer(length);
            IGeometry pGeomentry = pBuffer.Envelope;
            //空间滤过器
            ISpatialFilter pSpatialFilter = new SpatialFilter();
            pSpatialFilter.Geometry = pGeomentry;
            //根据被选择要素的不同，设置不同的空间滤过关系
            switch (pFeatureClass.ShapeType)
            {
                case esriGeometryType.esriGeometryPoint:
                    pSpatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelContains;
                    break;
                case esriGeometryType.esriGeometryPolyline:
                    pSpatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelCrosses;
                    break;
                case esriGeometryType.esriGeometryPolygon:
                    pSpatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects;
                    break;

            }
            IFeatureSelection pFSelection = pFeatureLayer as IFeatureSelection;
            pFSelection.SelectFeatures(pSpatialFilter, esriSelectionResultEnum.esriSelectionResultNew, false);
            ISelectionSet pSelectionset = pFSelection.SelectionSet;
            ICursor pCursor;
            pSelectionset.Search(null, true, out pCursor);
            IFeatureCursor pFeatCursor = pCursor as IFeatureCursor;
            IFeature pFeature = pFeatCursor.NextFeature();
            while (pFeature != null)
            {
                pMap.SelectFeature(pFeatureLayer, pFeature);
                pFeature = pFeatCursor.NextFeature();
pFeture.get_value("");//在这里你可以写上想要获取的属性的字段
            }
            pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphicSelection, null, null);

上述的自定义函数是将距离的转换

private double ConvertPixelsToMapUnits(IActiveView pActiveView, double pixelUnits)
        {
            // Uses the ratio of the size of the map in pixels to map units to do the conversion
            IPoint p1 = pActiveView.ScreenDisplay.DisplayTransformation.VisibleBounds.UpperLeft;
            IPoint p2 = pActiveView.ScreenDisplay.DisplayTransformation.VisibleBounds.UpperRight;
            int x1, x2, y1, y2;
            pActiveView.ScreenDisplay.DisplayTransformation.FromMapPoint(p1, out x1, out y1);
            pActiveView.ScreenDisplay.DisplayTransformation.FromMapPoint(p2, out x2, out y2);
            double pixelExtent = x2 - x1;
            double realWorldDisplayExtent = pActiveView.ScreenDisplay.DisplayTransformation.VisibleBounds.Width;
            double sizeOfOnePixel = realWorldDisplayExtent / pixelExtent;
            return pixelUnits * sizeOfOnePixel;
        }