C# ArcGIS Server9.3 显示图例

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Geodatabase;
using ESRI.ArcGIS.ADF.Web.DataSources.ArcGISServer;

using Teleware.WebGIS.GISUtils;

///<summary>
/// AJAXShowLegend 的摘要说明
/// </summary>

//InitialToolbar();
//初始化图例
//ESRI.ArcGIS.ADF.Web.DataSources.ArcGISServer.MapFunctionality mapFunc = Map1.GetFunctionality(SessionDataManager.SystemMapResourceName) as ESRI.ArcGIS.ADF.Web.DataSources.ArcGISServer.MapFunctionality;
//string[] layerids, strlayernames;
//mapFunc.GetLayers(out layerids, out strlayernames);
//legendlayers.Items.Add("选择图层");
//legendlayers.Items.Add("显示全部图例");
//for (int i = 0; i < strlayernames.Length; i++)
//    {
//        legendlayers.Items.Add(strlayernames[i]);
//  }
//legendlayers.Attributes.Add("onchange", "javascript:Showlayerlegend(LegendShowPanel_legendlayers.value)");
//初始化行政区查询框
//XzqList.Items.Add("市级行政区");


public class ShowLegend: IAJAXServerProcess
{
    #region IAJAXServerProcess 成员
    public string ProcessMessage(ESRI.ArcGIS.ADF.Web.UI.WebControls.Map Map1, string commandName, string[] parameters)
    {
        if (parameters.Length < 1) return "";
        string layerName = parameters[0];
        return CreateLayerLegend(Map1, layerName);
    }
    #endregion

    private string CreateLayerLegend(ESRI.ArcGIS.ADF.Web.UI.WebControls.Map Map1,string layername)
    {
        ESRI.ArcGIS.ADF.Web.DataSources.ArcGISServer.MapFunctionality mapFunc = Map1.GetFunctionality(SessionDataManager.SystemMapResourceName) as ESRI.ArcGIS.ADF.Web.DataSources.ArcGISServer.MapFunctionality;

        //LayerDescription[] layerdescriptions= mapFunc.MapDescription.LayerDescriptions;
        ESRI.ArcGIS.ADF.Web.DataSources.ArcGISServer.MapResourceLocal mapresource = mapFunc.Resource as ESRI.ArcGIS.ADF.Web.DataSources.ArcGISServer.MapResourceLocal;
        ESRI.ArcGIS.ADF.Web.DataSources.ArcGISServer.MapTocFunctionality maptocfunc = new ESRI.ArcGIS.ADF.Web.DataSources.ArcGISServer.MapTocFunctionality("sss", mapresource);
        ESRI.ArcGIS.ADF.Web.TocDataFrame[] tocdataframe = maptocfunc.GetMapContents(mapFunc.Name, ESRI.ArcGIS.ADF.Web.WebImageFormat.JPG, true, true);
        ESRI.ArcGIS.ADF.Web.UI.WebControls.TreeViewPlusNode node1 = new ESRI.ArcGIS.ADF.Web.UI.WebControls.TreeViewPlusNode();
        ESRI.ArcGIS.ADF.Web.TocLayer ptoclayer;
        ESRI.ArcGIS.ADF.Web.UI.WebControls.FloatingPanel QueryResultShowPanel = Map1.FindControl("LegendShowPanel") as ESRI.ArcGIS.ADF.Web.UI.WebControls.FloatingPanel;
        PlaceHolder pplaceholder = QueryResultShowPanel.FindControl("PlaceHolder2") as PlaceHolder;
        if (tocdataframe.Length > 0)
        {
            System.Collections.IEnumerator ptocenum = tocdataframe[0].GetEnumerator();

            HtmlTable htable = new HtmlTable();

            if (layername != "显示全部图例")
            {
                //显示所选图层图例
                while (ptocenum.MoveNext())
                {
                    ptoclayer = (ESRI.ArcGIS.ADF.Web.TocLayer)ptocenum.Current;
                    if (ptoclayer.Name == layername)
                    {
                        CreateSomeLayerLegend(ptoclayer, htable);
                        break;
                    }
                }
            }
            else
            {
                //显示全部图层图例
                while (ptocenum.MoveNext())
                {
                    ptoclayer = (ESRI.ArcGIS.ADF.Web.TocLayer)ptocenum.Current;
                    CreateSomeLayerLegend(ptoclayer, htable);
                }
            }

            pplaceholder.Controls.Add(htable);
            //QueryResultShowPanel.ShowFloatingPanel();
            QueryResultShowPanel.Refresh();
            //legendlayers.Text = layername;

        }
        //return QueryResultShowPanel.CallbackResults.ToString();
        Map1.CallbackResults.CopyFrom(QueryResultShowPanel.CallbackResults);
        return Map1.CallbackResults.ToString();

    }

    private void CreateSomeLayerLegend(ESRI.ArcGIS.ADF.Web.TocLayer ptoclayer, HtmlTable htable)
    {
        HtmlTableCell hcell = new HtmlTableCell();
        HtmlTableRow hrow = new HtmlTableRow();
        hcell.InnerText = ptoclayer.Name;
        hrow.Cells.Add(hcell);
        htable.Rows.Add(hrow);
        System.Collections.IEnumerator ptocsymbolenum = ptoclayer.GetTocSymbolGroups();
        while (ptocsymbolenum.MoveNext())
        {
            ESRI.ArcGIS.ADF.Web.TocSymbolGroup group = ptocsymbolenum.Current as ESRI.ArcGIS.ADF.Web.TocSymbolGroup;
            foreach (ESRI.ArcGIS.ADF.Web.TocSymbol symbol in group)
            {
                ESRI.ArcGIS.ADF.Web.UI.WebControls.TreeViewPlusNode node2 = new ESRI.ArcGIS.ADF.Web.UI.WebControls.TreeViewPlusNode();
                HtmlImage himage = new HtmlImage();
                himage.Src = symbol.Image.Url;
                hcell = new HtmlTableCell();
                hrow = new HtmlTableRow();
                hcell.Controls.Add(himage);
                hrow.Cells.Add(hcell);
                hcell = new HtmlTableCell();
                if (symbol.Label == "<all other values>")
                    hcell.InnerText = "其它";
                else
                    hcell.InnerText = symbol.Label;
                hrow.Cells.Add(hcell);
                htable.Rows.Add(hrow);
            }
        }
    }
}