ArcGIS Server 中查询结果要素定位

   

  其中index为当前要素在查询结果集（dataset或者datatable）中的索引号  
    /// <param name="index">要素索引号</param>
    public void FeatureLocation(int index)
    {
        DataSet ds = Session["Gridview1"] as DataSet; //Session["Gridview1"] 为查询结果集
        DataTable pDT = ds.Tables[0];
        if (pDT.Rows.Count < 1) return;
        try
        {
            ESRI.ArcGIS.ADF.Web.Display.Graphics.GraphicsLayer pGraLyr = ESRI.ArcGIS.ADF.Web.DataSources.ArcGISServer.Converter.ToGraphicsLayer(pDT);
            ESRI.ArcGIS.ADF.Web.Geometry.Geometry pGeo = pGraLyr.GeometryFromRow(pGraLyr.Rows[index]);
            ESRI.ArcGIS.ADF.Web.Geometry.Envelope Penv = new ESRI.ArcGIS.ADF.Web.Geometry.Envelope();
            if (pGeo is ESRI.ArcGIS.ADF.Web.Geometry.Point)
            {
                ESRI.ArcGIS.ADF.Web.Geometry.Point pPT = (ESRI.ArcGIS.ADF.Web.Geometry.Point)pGeo;
                Penv.XMin = pPT.X - 0.00001;
                Penv.XMax = pPT.X + 0.00001;
                Penv.YMin = pPT.Y - 0.00001;
                Penv.YMax = pPT.Y + 0.00001;

            }
            else if (pGeo is ESRI.ArcGIS.ADF.Web.Geometry.Polyline)
            {
                ESRI.ArcGIS.ADF.Web.Geometry.Polyline pLY = (ESRI.ArcGIS.ADF.Web.Geometry.Polyline)pGeo;
                Penv = ESRI.ArcGIS.ADF.Web.Geometry.Geometry.GetMinimumEnclosingEnvelope(pLY);

            }          //另外面的处理情况与线类似
            Penv = Penv.Expand(2);
            CustomFunction.Location.ClearTempElementInMap("TempEle", Map1);//此函数为清除定位标记
            Map1.Extent = Penv;
            CustomFunction.Location.AddTempGraphicElement(pGeo, false, "", false, System.Drawing.Color.Red, 40, Map1);//此函数为添加定位标记
            Map1.CallbackResults.CopyFrom(Toolbar1.CallbackResults);
            smapstring = Map1.CallbackResults.ToString();

            pDT.Dispose();
        }
        catch (Exception ex)
        {
            SystemLog.WriteLog("当前记录定位错误！", ex);
        }

    }