protected void cmdQuery_Click(object sender, EventArgs e)
    {
        Query(Map1.Extent);
    }

protected void Query(ESRI.ArcGIS.ADF.Web.Geometry.Geometry geometry)
    {
        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 = 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;
                //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;
                }
            }
        }
    }