C# AE 地物名称到地图空间位置查询函数（转）

最新推荐文章于 2019-12-15 20:05:56 发布

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最新推荐文章于 2019-12-15 20:05:56 发布

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文章标签： c#

原文链接：http://www.cnblogs.com/hl137510705/p/9266785.html

///
///mc//载入地图的控件
///findstr//查询字符串与SQL语句相同如：NAME ='***'
///sLayerName//查询的地物所在图层
///
public void findlocation(AxMapControl mc,string findstr,string sLayerName)//查询函数
        {

            IQueryFilter pQueryFilter = new QueryFilterClass();
            IFeatureLayer pFeatureLayer;
            pFeatureLayer = mc.get_Layer(GetLayerFromName(sLayerName, mc)) as IFeatureLayer;

            //GetLayerFromName函数下文有，主要是根据图层名获取图层所在的索引号
            mc.MapScale = pFeatureLayer.MinimumScale;
            if(pFeatureLayer == null)
                return;
            mc.Map.ClearSelection();
            IFeatureClass pFeatureClass = pFeatureLayer.FeatureClass;
            pQueryFilter.WhereClause = findstr;//查询条件
            IFeatureCursor pFeatureCursor = pFeatureClass.Search(pQueryFilter, false);
            pFeature = pFeatureCursor.NextFeature();
            IFeatureSelection pFeatureSelection = pFeatureLayer as IFeatureSelection;
            while (pFeature != null)
            {
                mc.Map.SelectFeature(mc.get_Layer(GetLayerFromName(sLayerName, mc)), pFeature);
                mc.FlashShape(pFeature.Shape, 1, 500,null);
                mc.DrawShape(pFeature.Shape);
                pFeatureSelection.SelectFeatures(pQueryFilter, esriSelectionResultEnum.esriSelectionResultNew, false);
                showcenter(mc, pFeature);//下文有函数，作用是使查询地物居中显示
                pFeature = pFeatureCursor.NextFeature();
             
            }
            
        }

     //从图层的名称获得Ilayer接口类
        private int GetLayerFromName(string sName, AxMapControl axmap)
        {
            int pLyrid=0;
            try
            {
                for (int i = 0; i <= axmap.LayerCount - 1; i++)
                {
                    if (axmap.get_Layer(i).Name == sName)
                    {
                        pLyrid = i;
                    }
                }    
            }
            catch (System.Exception Ex)
            {
                MessageBox.Show(Ex.ToString());
            }
            return pLyrid;
        }

        public double x;
        public double y;
        private void showcenter(AxMapControl mc,IFeature pftr)//查询地物居中显示函数
        {
            x = pftr.Extent.XMin + pftr.Extent.Height / 2;
            y = pftr.Extent.YMin + pftr.Extent.Width / 2;
            IPoint pt = new PointClass();
            pt.PutCoords(x, y);
            mc.CenterAt(pt);
        }