【225】ArcEngine 实现要素添加 & 删除

时间：2025-03-17 13:03:31

参考：ArcGIS Engine效率探究——要素的添加和删除、属性的读取和更新

删除要素

                //添加图层，显示在最上面

                axMapControl1.AddShapeFile(@"D:\01-业务工作\08-综合业务平台\综合业务平台数据\船载", "cjsj.shp");

                //删除 shapefile 中的要素

                //获取第一个图层

                ILayer pLayer = axMapControl1.get_Layer(0);

                //以矢量图层的形式获取

                IFeatureLayer pFLayer = pLayer as IFeatureLayer;

                //获取要素集

                IFeatureClass pFC = pFLayer.FeatureClass;

                //查询全部要素

                IFeatureCursor pFCursor = pFC.Search(null, false);

                IFeature pfeature = pFCursor.NextFeature();

                //遍历所有要素，并删除

                while (pfeature != null)

                {

                    pfeature.Delete();

                    pfeature = pFCursor.NextFeature();

                }

添加要素，dtzh 为 DataTable 对象

                for (int i = 0; i < dtzh.Rows.Count; i++)

                {

                    //定义一个点，并加入经纬度

                    IPoint pPoint = new PointClass();

                    double lon = Double.Parse(dtzh.Rows[i]["经度"].ToString());

                    double lat = Double.Parse(dtzh.Rows[i]["纬度"].ToString());

                    pPoint.PutCoords(lon, lat);

                    //将点添加到要素集中，并存储

                    IFeature pFeature = pFC.CreateFeature();

                    pFeature.Shape = pPoint;

                    pFeature.Store();

                    //获取索引值

                    int i_id = pFC.FindField("Id");

                    int i_time = pFC.FindField("Time");

                    int i_cjsj = pFC.FindField("采集时间");

                    int i_lon = pFC.FindField("经度");

                    int i_lat = pFC.FindField("纬度");

                    int i_fo = pFC.FindField("Fo");

                    int i_fm = pFC.FindField("Fm");

                    int i_fv = pFC.FindField("Fv");

                    int i_bv = pFC.FindField("BV");

                    int i_yield = pFC.FindField("Yield");

                    //为要素添加属性值

                    pFeature.set_Value(i_id, i);

                    pFeature.set_Value(i_time, dtzh.Rows[i]["Time"].ToString());

                    pFeature.set_Value(i_cjsj, dtzh.Rows[i]["采集时间"].ToString());

                    pFeature.set_Value(i_lon, Double.Parse(dtzh.Rows[i]["经度"].ToString()));

                    pFeature.set_Value(i_lat, Double.Parse(dtzh.Rows[i]["纬度"].ToString()));

                    pFeature.set_Value(i_fo, Int32.Parse(dtzh.Rows[i]["Fo"].ToString()));

                    pFeature.set_Value(i_fm, Int32.Parse(dtzh.Rows[i]["Fm"].ToString()));

                    pFeature.set_Value(i_fv, Int32.Parse(dtzh.Rows[i]["Fv"].ToString()));

                    pFeature.set_Value(i_bv, Int32.Parse(dtzh.Rows[i]["Blank Value"].ToString()));

                    pFeature.set_Value(i_yield, dtzh.Rows[i]["Yield"].ToString());

                    pFeature.Store();

                }

显示地图经纬度坐标

        private void axMapControl1_OnMouseMove(object sender, IMapControlEvents2_OnMouseMoveEvent e)

        {

            tssl_lonlat.Text = String.Format("经纬度：东经{0:0.000}°  北纬{1:0.000}°", e.mapX, e.mapY);

            tssl_lonlat.Visible = true;

        }

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