选中feature并高亮显示.doc

选中feature并高亮显示
2008-07-10 15:28
protected void cmdSelect_Click(object sender, EventArgs e)
     {
       //   SelectFeatures(Map1.Extent);
         SelectFeatures();
     }
     public void SelectFeatures()
     {
         #region
         /*
         IEnumerable func_enum = null
         //获取当前map1控件中所有的functionality
         func_enum = Map1.GetFunctionalities();

         System.Data.DataTable datatable;
         //对所有的functionality进行遍历
         foreach (ESRI.ArcGIS.ADF.Web.DataSources.IGISFunctionality gisfunctionality in func_enum)
         {
             ESRI.ArcGIS.ADF.Web.DataSources.IGISResource gisresource = null;
             //得到该functionality的resource
             gisresource = gisfunctionality.Resource;

             //判断该resource是否支持IQueryFunctionality  
             bool supported = false;
             supported = gisresourceSupportsFunctionality(typeof(ESRI.ArcGIS.ADF.Web.DataSources.IQueryFunctionality));

             if (supported)
             {
                 ESRI.ArcGIS.ADF.Web.DataSources.IQueryFunctionality qfunc;
                 qfunc = (ESRI.ArcGIS.ADF.Web.DataSources.IQueryFunctionality)gisresource.CreateFunctionality(typeof(ESRI.ArcGIS.ADF.Web.DataSources.IQueryFunctionality), null);

                 string[] lids;
                 string[] lnames;
                 //获得图层的layerId和layerName，GetQueryableLayers的重载方法可以指定图层类型
                 qfunc.GetQueryableLayers(null, out lids, out lnames);

                 ESRI.ArcGIS.ADF.Web.SpatialFilter spatialfilter = new ESRI.ArcGIS.ADF.Web.SpatialFilter();
                 //设置过滤器的过滤条件，txtQuery就是panel中text box的ID
                 spatialfilter.ReturnADFGeometries = false;
                 spatialfilter.MaxRecords = 1000;

                 spatialfilter.WhereClause = txtQuery.Text;
                 spatialfilter.Geometry = geometry;

                 //对指定的图层进行查询，查询的结果保存为DataTable
                 datatable = qfunc.Query(null, lids[0], spatialfilter);

                 TreeViewPlus1.Nodes.Clear();
                 if (datatable != null)
                 {
                     System.Data.DataSet ds = new System.Data.DataSet();
                     ds.Tables.Add(datatable);
                     TreeViewPlus1.ShowClearAllButton = false;
                     //将结果绑定到TreeViewPlus控件上
                     TreeViewPlus1.BindToDataSet(ds);

                     TreeViewPlus1.Nodes[0].Expanded = true;
                 }
             }
         }
         */
         #endregion
         int resource_index = 1;
         string targetlayername = "countries";
         System.Data.DataTable datatable = null;
         //直接获取MapResourceName为world的MapFunctionality，它的编号为1
         ESRI.ArcGIS.ADF.Web.DataSources.IMapFunctionality mf = (ESRI.ArcGIS.ADF.Web.DataSources.IMapFunctionality)Map1.GetFunctionality(resource_index);
         //先得到functionality，再获取resource
         ESRI.ArcGIS.ADF.Web.DataSources.IGISResource gisresource = mf.Resource;
         bool supported = gisresource.SupportsFunctionality(typeof(ESRI.ArcGIS.ADF.Web.DataSources.IQueryFunctionality));
         if (supported)
         {
             ESRI.ArcGIS.ADF.Web.DataSources.IQueryFunctionality qfunc;
             qfunc = (ESRI.ArcGIS.ADF.Web.DataSources.IQueryFunctionality)gisresource.CreateFunctionality(typeof(ESRI.ArcGIS.ADF.Web.DataSources.IQueryFunctionality), null);

             string[] lids;
             string[] lnames;
             qfunc.GetQueryableLayers(null, out lids, out lnames);

             ESRI.ArcGIS.ADF.Web.SpatialFilter spatialfilter = new ESRI.ArcGIS.ADF.Web.SpatialFilter();
             spatialfilter.ReturnADFGeometries = false;
             spatialfilter.MaxRecords = 1000;
             spatialfilter.WhereClause = "OBJECTID like " + txtQuery.Text;

             datatable = qfunc.Query(null, lids[0], spatialfilter);

         }

         //重新获得Map1控件所有的functionality
         IEnumerable gfc = Map1.GetFunctionalities();
         ESRI.ArcGIS.ADF.Web.DataSources.Graphics.MapResource gResource = null;
         foreach IGISFunctionality gfunc in gfc)
         {
             //找到名为"Selection"的MapResource
             if (gfunc.Resource.Name == "Selection")
             {
                 //down cast到ESRI.ArcGIS.ADF.Web.DataSources.Graphics.MapResource
                 gResource = (ESRI.ArcGIS.ADF.Web.DataSources.Graphics.MapResource)gfunc.Resource;
             }
         }

         if (gResource == null)
             return;

         ESRI.ArcGIS.ADF.Web.Display.Graphics.ElementGraphicsLayer glayer = null;

         foreach (System.Data.DataTable dt in gResource.Graphics.Tables)
         {
             if (dt is ESRI.ArcGIS.ADF.Web.Display.Graphics.ElementGraphicsLayer)
             {
                 glayer = (ESRI.ArcGIS.ADF.Web.Display.Graphics.ElementGraphicsLayer)dt;
                 break;
             }
         }

         if (glayer == null)
         {
             glayer = new ESRI.ArcGIS.ADF.Web.Display.Graphics.ElementGraphicsLayer();

             gResource.Graphics.Tables.Add(glayer);
         }

         //清除已有数据
         glayer.Clear();

         DataRowCollection drs = datatable.Rows;

         int shpind = -1;
         for (int i = 0; i < datatable.Columns.Count; i++)
         {
             if (datatable.Columns[i].DataType == typeof(ESRI.ArcGIS.ADF.Web.Geometry.Geometry))
             {
                 //找到Geometry字段的序号
                 shpind = i;
                 break;
             }
         }

         try
         {
             foreach (DataRow dr in drs)
             {
                 ESRI.ArcGIS.ADF.Web.Geometry.Geometry geom = (ESRI.ArcGIS.ADF.Web.Geometry.Geometry)dr[shpind];

                 //创建一个GraphicElement
                 ESRI.ArcGIS.ADF.Web.Display.Graphics.GraphicElement ge = null;
                 ge = new ESRI.ArcGIS.ADF.Web.Display.Graphics.GraphicElement(geom, System.Drawing.Color.Yellow);
                 ge.Symbol.Transparency = 50.0;

                 //将GraphicElement添加到ElementGraphicsLayer中
                 glayer.Add(ge);
             }
         }
         catch (InvalidCastException ice)
         {
             throw new Exception("No geometry available in datatable");
         }

         if (Map1.ImageBlendingMode == ImageBlendingMode.WebTier)
         { Map1.Refresh(); }
         else if (Map1.ImageBlendingMode == ImageBlendingMode.Browser)
         {
             //只刷新Graphics Resource
             Map1.RefreshResource(gResource.Name);
         }
     }