【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;
}