ArcGIS Server 9.3下自写Idenfity功能（vs2008环境下）

 

 效果图如下所示：

 

1、在工具栏上添加idenfify工具，其代码如下：

<esri:Tool ClientAction="Point" DefaultImage="~/image/identify.png"

DisabledImage="~/image/identify_OFF.gif"HoverImage="~/image/identify_HOVER.gif"JavaScriptFile=""Name="MapIdentify"SelectedImage="~/image/identify_ON.gif" ServerActionAssembly="App_code" ServerActionClass="MapIdentify" Text="MapIdentify" ToolTip="MapIdentify" />

2、添加TaskResults控件用来存放结果并将它放在一个div中。代码如下：

<div id="tskdiv" runat="server"   >

     <esri:TaskResults ID="TaskResults1" runat="server" BackColor="#ffffff"

            Font-Names="Verdana" Font-Size="8pt" ForeColor="#000000" Map="Map1" style="top: 253px; left: 517px; overflow:auto; width: 298px; height: 209px; "

     />

</div>

3.在Default 页面的Page_Load中加入

Session["TaskResultsControl"] = TaskResults1;

用来传递TaskResults1对象。

4、在App_code 中加入MapIdentify.cs，其代码如下：

 

public class MapIdentify:IMapServerToolAction

    {

        #region IMapServerToolAction Members

      

 

       void IMapServerToolAction.ServerAction(ToolEventArgs args)

        {

 

            int m_numberDecimals = 3;

              int m_IdentifyTolerance = 5;

            Map map = (Map)args.Control;

            IGISResource resource;

            IQueryFunctionality query;

 

            string locXString = "";

            string locYString = "";

 

            IdentifyOption m_idOption = IdentifyOption.VisibleLayers;

 

            PointEventArgs pea = (PointEventArgs)args;

 

    

            System.Drawing.Point screen_point = pea.ScreenPoint;

 

 

 

            //像素坐标转换成地理坐标

            ESRI.ArcGIS.ADF.Web.Geometry.Point mapPoint = ESRI.ArcGIS.ADF.Web.Geometry.Point.ToMapPoint(screen_point.X, screen_point.Y, map.GetTransformationParams(ESRI.ArcGIS.ADF.Web.Geometry.TransformationDirection.ToMap));

 

            List<DataSet> gdsList = new List<DataSet>();

          

            DataTable[] ds = null;

 

            foreach (IMapFunctionality mapFunc in map.GetFunctionalities())

            {

                if (mapFunc is ESRI.ArcGIS.ADF.Web.DataSources.Graphics.MapFunctionality)

                {

                    continue;

                }

                resource = mapFunc.Resource;

                //建立查询方法

 

                query = resource.CreateFunctionality(typeof(ESRI.ArcGIS.ADF.Web.DataSources.IQueryFunctionality), "identify_") as IQueryFunctionality;

 

                string[] layerIds;

                string[] layerNames;

                //查询地图图层id和名称

                query.GetQueryableLayers(null, out layerIds, out layerNames);

                //resource类型

                string resourceType = resource.DataSource.GetType().ToString();

 

                //只显示坐标的3个小数

                double roundFactor = Math.Pow(10, m_numberDecimals);

                string pointXString = Convert.ToString(Math.Round(mapPoint.X * roundFactor) / roundFactor);

                string pointYString = Convert.ToString(Math.Round(mapPoint.Y * roundFactor) / roundFactor);

 

                locXString = pointXString;

                locYString = pointYString;

 

               

                try

                {

                    //进行查询并且把查询结果放入DataTable数组 

                    //                                查询坐标 冗余半径             只查可见图层

                    ds = query.Identify(mapFunc.Name, mapPoint, m_IdentifyTolerance, m_idOption, null);

                }

                catch (Exception e)

                {

                    //出错处理

                    DataTable table = new DataTable();

                    table.TableName = "Identify Error: " + e.Message;

                    ds = new DataTable[] { table };

                }

                //判断查询结果

                if (ds != null && ds.Length > 0)

                {

                    DataSet gds = new DataSet();

                    DataTable table;

 

                    //对查询结果DataTable[]进行遍历添加到DataSet

                    for (int j = ds.Length - 1; j >= 0; j--)

                    {

                        table = ds[j];

                        if (table.Rows.Count == 0 && table.TableName.IndexOf("Error") < 0)

                        {

                            //跳过本次进入下一次循环

                           continue;

                        }

 

                        //把DataTable转换成GraphicsLayer

                        GraphicsLayer layer = ESRI.ArcGIS.ADF.Web.Converter.ToGraphicsLayer(table, System.Drawing.Color.Empty, System.Drawing.Color.Aqua);

                       

                        layer.RenderOnClient = true;

                        if (layer != null)

                        {

                            gds.Tables.Add(layer);

                        }

                        else

                        {

                            gds.Tables.Add(table);

                        }

                    }

                    if (gds.Tables.Count == 0)

                    {

                        //跳过本次循环

                        continue;

                    }

                    gds.DataSetName = resource.Name + " (" + pointXString + ", " + pointYString + ")";

                    gdsList.Add(gds);

                }

            }

           

          ESRI.ArcGIS.ADF.Web.UI.WebControls.TaskResults taskResults =

    (ESRI.ArcGIS.ADF.Web.UI.WebControls.TaskResults)map.Page.Session["TaskResultsControl"];

 

           taskResults.Visible = true;

 

            for (int i = gdsList.Count - 1; i >= 0; i--)

            {

                //用TaskResults进行查询内容显示

                // m_resultsDisplay.DisplayResults(null, null, null, gdsList[i]);

 

              taskResults.DisplayResults(null, null, null, gdsList[i]);

            }

 

            //没有查询到结果

            if (gdsList.Count == 0)

            {

                string heading = "Location (" + locXString + ", " + locYString + ") No results found";

                string detail = "No results found";

                SimpleTaskResult str = new SimpleTaskResult(heading, detail);

           

                taskResults.DisplayResults(null, null, null, str);

            }

 

 

          

           // Copy the TaskResults' callback results to the Map so the results show up

           map.CallbackResults.CopyFrom(taskResults.CallbackResults);

}

#endregion

}