【225】ArcEngine 实现要素添加 & 删除

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

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//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

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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

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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; }