ArcEngine地图点击事件下的属性查询实例

  private void axMapControl_OnMouseDown(object sender, IMapControlEvents2_OnMouseDownEvent e)
        {
            if ((bool)barBtnProperty.Tag == true)
            //如果查询比较频繁可以在此设置类别
            {
                barBtnProperty.Tag = false;
                ILayer pLayer;
                IFeatureLayer pFL;
                IFeatureSelection pFeatureSelection;
                IEnvelope pEnv;
                IGeometry pGeometry;
                ISpatialFilter pSpatialFilter;
                ISelectionSet pSelectionSet;
                IEnumIDs pEnumIDs;
                IFeature pFeature;

                pEnv = new EnvelopeClass();
                double ext = 0;  //点选的扩展矩形
                IEnvelope mapExt = this.axMapControl.Extent;  //地图显示范围
                int mapWidth = this.axMapControl.Right - this.axMapControl.Left;
                ext = 5 * (mapExt.XMax - mapExt.XMin) / mapWidth;
                pEnv.PutCoords(e.mapX - ext, e.mapY - ext, e.mapX + ext, e.mapY + ext);
                pGeometry = pEnv as IGeometry;
                pSpatialFilter = new SpatialFilterClass();
                pSpatialFilter.Geometry = pGeometry;
                pSpatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects;

                FrmIdentity frmidentity = FrmIdentity.CreatForm();
                frmidentity.StartPosition = FormStartPosition.CenterScreen;
                frmidentity.Show();