完整 ArcGIS Server 专题图的实现(转载)

  public static int getLayerId(string name, ESRI.ArcGIS.ADF.Web.DataSources.IQueryFunctionality qfunc)
    {
        string[] lids;
        string[] lnames;
        qfunc.GetQueryableLayers(null, out lids, out lnames);
        int layerid = 0;
        for (int i = 0; i < lnames.Length; i++)
        {
            if (lnames[i] == name)
            {
                int.TryParse((string)lids[i], out layerid);
            }
        }
        return layerid;
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        string resultstr = "";
        int gisresource_index = 1;
        string queryLayername = "usa_way";
        ESRI.ArcGIS.ADF.Web.DataSources.IMapFunctionality mf = (ESRI.ArcGIS.ADF.Web.DataSources.IMapFunctionality)Map1.GetFunctionality(gisresource_index);
        ESRI.ArcGIS.ADF.Web.DataSources.ArcGISServer.MapFunctionality ags_mf = (ESRI.ArcGIS.ADF.Web.DataSources.ArcGISServer.MapFunctionality)mf;
        ESRI.ArcGIS.ADF.Web.DataSources.IGISResource gisresource = mf.Resource;
        bool supported = gisresource.SupportsFunctionality(typeof(ESRI.ArcGIS.ADF.Web.DataSources.IQueryFunctionality));
        int layerid = 1;
        if (supported)
        {            
            ESRI.ArcGIS.ADF.Web.DataSources.IQueryFunctionality qfunc = (ESRI.ArcGIS.ADF.Web.DataSources.IQueryFunctionality)gisresource.CreateFunctionality(typeof(ESRI.ArcGIS.ADF.Web.DataSources.IQueryFunctionality), null);
            ESRI.ArcGIS.ADF.Web.DataSources.ArcGISServer.MapResourceBase ags_mr = (ESRI.ArcGIS.ADF.Web.DataSources.ArcGISServer.MapResourceBase)qfunc.Resource;

            layerid = MapUtil.getLayerId(queryLayername, qfunc);

        }
        ChartRender c = new ChartRender(this.Map1, this.Toc1);
        c.CreatePieRenderer(layerid, new string[] { "记录号"});



using System;
using System.Data;
using System.Web;
using ESRI.ArcGIS.Display;
using ESRI.ArcGIS.ADF.Web.DataSources.ArcGISServer;
using ESRI.ArcGIS.ADF.Connection.AGS;
using ESRI.ArcGIS.Server;
using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Geodatabase;
using ESRI.ArcGIS.ADF.Web.UI.WebControls;

/// BarChartRender 的摘要说明
public class ChartRender
{
    private ESRI.ArcGIS.ADF.Web.UI.WebControls.Map pMap;
    private ESRI.ArcGIS.ADF.Web.UI.WebControls.Toc pToc;
    private IServerContext pServerContext;
    private MapResourceLocal pMapResLocal;
    private IGeoFeatureLayer pGeoFeatureLyer;

    public ChartRender()
    {
    }

    public ChartRender(ESRI.ArcGIS.ADF.Web.UI.WebControls.Map map, Toc toc)
    {
        pMap = map;
        pToc = toc;
    }

    /// <summary>
    /// 获取当前map的servercontext
    /// </summary>
    /// <returns></returns>
    IServerContext GetServetContext()
    {
        try
        {
            MapFunctionality pMapFunc = pMap.GetFunctionality(pMap.MapResourceManagerInstance.ResourceItems.Count - 1) as MapFunctionality;
            MapDescription pMapDesc = pMapFunc.MapDescription as MapDescription;

            pMapResLocal = pMapFunc.MapResource as MapResourceLocal;
            return pMapResLocal.ServerContextInfo.ServerContext;
        }
        catch (Exception ex)
        {
            throw new Exception("Fail to get the servercontext!");
        }
    }

    /// <summary>
    /// 创建柱状专题图表
    /// </summary>
    /// <param name="layerID"></param>
    /// <param name="fields"></param>
    public void CreateBarRenderer(int layerID, string[] fields)
    {
        try
        {
            pServerContext = GetServetContext();
            MapServer pMapServer = pMapResLocal.MapServer as MapServer;
            IMapServerObjects pMapServerObj = pMapServer as IMapServerObjects;
            string mapName = pMapServer.get_MapName(0);
            ILayer pLayer = pMapServerObj.get_Layer(mapName, layerID);
            pGeoFeatureLyer = pLayer as IGeoFeatureLayer;

            //设置专题图元素的属性名称列表           
            IChartRenderer pChartRender = pServerContext.CreateObject("esriCarto.ChartRenderer") as IChartRenderer;
            IRendererFields pRenderFields = pChartRender as IRendererFields;
            foreach (string var in fields)
            {
                pRenderFields.AddField(var, var);
            }

            //实例化图表对象并取得元素指定属性的最大值
            IBarChartSymbol pBarChartSymbol = pServerContext.CreateObject("esriDisplay.BarChartSymbol") as IBarChartSymbol;
            IChartSymbol pChartSymbol = pBarChartSymbol as IChartSymbol;
            pChartSymbol.MaxValue = GetStaMaxMin(fields)[0];
            pBarChartSymbol.Width = 8;
            IMarkerSymbol pMarkerSymbol = pBarChartSymbol as IMarkerSymbol;
            pMarkerSymbol.Size = 50;

            //设置柱状图每列填充效果
            ISymbolArray pSymbolArray = pBarChartSymbol as ISymbolArray;
            Random ranColor = new Random();
            for (int i = 0; i < fields.Length; i++)
            {
                IFillSymbol pFillSymbol = pServerContext.CreateObject("esriDisplay.SimpleFillSymbol") as IFillSymbol;
                pFillSymbol.Color = GetRGB(ranColor.Next(255), ranColor.Next(255), ranColor.Next(255));
                pSymbolArray.AddSymbol((ISymbol)pFillSymbol);
            }

            //设置地图图层背景
            ISimpleFillSymbol pFSymbol = pServerContext.CreateObject("esriDisplay.SimpleFillSymbol") as SimpleFillSymbol;
            pFSymbol.Color = GetRGB(239, 228, 249);
            pChartRender.BaseSymbol = pFSymbol as ISymbol;

            //应用柱状专题到指定图层
            pChartRender.ChartSymbol = pBarChartSymbol as IChartSymbol;
            pChartRender.Label = "Test";
            pChartRender.UseOverposter = false;
            pChartRender.CreateLegend();
            pGeoFeatureLyer.Renderer = pChartRender as IFeatureRenderer;

            //刷新地图显示图表及图例
            pMap.Refresh();
            pToc.Refresh();
            pToc.ExpandDepth = 2;

        }
        catch (Exception ex)
        {
            throw new Exception("Fail to create bar chart!");
        }
    }

    /// <summary>
    /// 创建饼状专题地图
    /// </summary>
    /// <param name="layerID"></param>
    /// <param name="fields"></param>
    public void CreatePieRenderer(int layerID, string[] fields)
    {
        try
        {
            pServerContext = GetServetContext();
            MapServer pMapServer = pMapResLocal.MapServer as MapServer;
            IMapServerObjects pMapServerObj = pMapServer as IMapServerObjects;
            string mapName = pMapServer.get_MapName(0);
            ILayer pLayer = pMapServerObj.get_Layer(mapName, layerID);
            pGeoFeatureLyer = pLayer as IGeoFeatureLayer;

            //设置专题图元素的属性名称列表           
            IChartRenderer pChartRender = pServerContext.CreateObject("esriCarto.ChartRenderer") as IChartRenderer;
            IRendererFields pRenderFields = pChartRender as IRendererFields;
            foreach (string var in fields)
            {
                pRenderFields.AddField(var, var);
            }
           

            //实例化图表对象并取得元素指定属性的最大值
            IPieChartSymbol pPieChartSymbol = pServerContext.CreateObject("esriDisplay.PieChartSymbol") as IPieChartSymbol;
            IChartSymbol pChartSymbol = pPieChartSymbol as IChartSymbol;
            pPieChartSymbol.Clockwise = true;
            pPieChartSymbol.UseOutline = true;
            pChartSymbol.MaxValue = GetStaMaxMin(fields)[0];
            //设置饼图外围线
            ISimpleLineSymbol pOutLine = pServerContext.CreateObject("esriDisplay.SimpleLineSymbol") as ISimpleLineSymbol;
            pOutLine.Color = GetRGB(255, 0, 255);
            pOutLine.Style = esriSimpleLineStyle.esriSLSSolid;
            pOutLine.Width = 1;
            pPieChartSymbol.Outline = pOutLine;
            IMarkerSymbol pMarkerSymbol = pPieChartSymbol as IMarkerSymbol;
            pMarkerSymbol.Size = 25;

            //设置饼状图外围填充效果
            ISymbolArray pSymbolArray = pPieChartSymbol as ISymbolArray;
            ISimpleFillSymbol pFSymbol = pServerContext.CreateObject("esriDisplay.SimpleFillSymbol") as SimpleFillSymbol;
            pFSymbol.Color = GetRGB(213, 212, 252);
            pFSymbol.Outline = pOutLine;
            //设置饼状图每列填充效果
            Random ranColor = new Random();
            for (int i = 0; i < fields.Length; i++)
            {
                IFillSymbol pFillSymbol = pServerContext.CreateObject("esriDisplay.SimpleFillSymbol") as IFillSymbol;
                pFillSymbol.Color = GetRGB(ranColor.Next(255), ranColor.Next(255), ranColor.Next(255));
                pSymbolArray.AddSymbol((ISymbol)pFillSymbol);
            }

            //设置地图图层背景
            pFSymbol = pServerContext.CreateObject("esriDisplay.SimpleFillSymbol") as SimpleFillSymbol;
            pFSymbol.Color = GetRGB(239, 228, 249);
            pChartRender.BaseSymbol = pFSymbol as ISymbol;

            //设置饼状图表属性
            IPieChartRenderer pPieChartRenderer = pChartRender as IPieChartRenderer;
            pPieChartRenderer.MinValue = 453588;
            pPieChartRenderer.MinSize = 10;
            pPieChartRenderer.FlanneryCompensation = false;
            pPieChartRenderer.ProportionalBySum = true;
            pPieChartRenderer.ProportionalField = fields[0];
            pChartRender.ChartSymbol = pPieChartSymbol as IChartSymbol;
            pChartRender.Label = "Population";

            //应用饼状专题到指定图层
            pChartRender.UseOverposter = false;
            pChartRender.CreateLegend();
            pGeoFeatureLyer.Renderer = pChartRender as IFeatureRenderer;

            //刷新地图显示图表及图例
            pMap.Refresh();
            pToc.Refresh();
        }
        catch (Exception ex)
        {
            throw new Exception("Fail to create bar chart!");
        }
    }

    /// <summary>
    /// 计算元素指定属性的最大值
    /// </summary>
    /// <param name="fields">元素的属性名称列表</param>
    /// <returns></returns>
    double[] GetStaMaxMin(string[] fields)
    {
        double pMaxValue = 0;
        double pMinValue = 0;
        double pStaMax;
        double pStaMin;
        double[] PMaxMin = new double[2];

        for (int i = 0; i < fields.Length; i++)
        {
            ICursor pCursor = pGeoFeatureLyer.Search(null, true) as ICursor;
            IDataStatistics pDataSta = new DataStatisticsClass();
            pDataSta.Cursor = pCursor;
            pDataSta.Field = fields[i];
            pStaMax = pDataSta.Statistics.Maximum;
            pStaMin = pDataSta.Statistics.Minimum;
            if (pMaxValue < pStaMax)
            {
                pMaxValue = pStaMax;
            }
            if (pMinValue > pStaMin)
            {
                pMinValue = pStaMin;
            }
        }
        PMaxMin[0] = pMaxValue;
        PMaxMin[1] = pMinValue;

        return PMaxMin;
    }

    /// <summary>
    /// 获取GRB颜色
    /// </summary>
    /// <param name="red"></param>
    /// <param name="green"></param>
    /// <param name="blue"></param>
    /// <returns></returns>
    IColor GetRGB(int red, int green, int blue)
    {
        IRgbColor rgbColor = pServerContext.CreateObject("esriDisplay.RGBColor") as IRgbColor;
        IColor color = rgbColor as IColor;
        rgbColor.Red = red;
        rgbColor.Green = green;
        rgbColor.Blue = blue;
        return color;
    }
}

以上代码也是来自社区里的代码，测试可以运行。
但是有个严重问题，
1、饼状图绘完后不能清除（除非重启服务）
2、不能再次设置新的render（出现ComException），尝试release com对象，出现com 与RCW不能分开的提示，也就是不能手动release com

这么多问题存在，这个chartRender基本还是不敢使用，大家研究研究。