查询矩形范围内的"点"要素

步骤

　　1,首先在含有主视图控件 ESRI.ArcGIS.Controls.AxMapControl mapCtrl_main 的主类中定义一个 IEnvelope 成员变量,用于记录鼠标在主视图控件画好的轮廓

 private ESRI.ArcGIS.Geometry.IEnvelope mainInvelope = null; //(主视图上)
 public ESRI.ArcGIS.Geometry.IEnvelope MainInvelopeValue {
     get {
     return mainInvelope;
     }
 }

并设置成外界可访问的属性.

　　2,在该类中定义一bool变量,以控制查询

 private bool startMainInvelope = false; //标识在主视图上画轮廓矩形,以进行该范围内点查询.

　　3,在 mapCtrl_main 的 OnMouseDown 响应事件中,控制轮廓的顺畅画好

 if ( == e.button && startMainInvelope) {   //在主视图上画轮廓.
     mainInvelope = mapCtrl_main.TrackRectangle();
     try {
         if (!mainInvelope.IsEmpty)
         Engine.App_Code.Draw.DrawSymbol(mapCtrl_main.Map, mainInvelope);
     }
     catch (System.Exception ex) {
         MessageBox.Show(ex.Message);
     }
 }

其中用到画轮廓的辅助方法定义为:

 /// <summary>
         /// 画轮廓.
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e">根据IEnvelope对象画轮廓.</param>
         public static void DrawSymbol(ESRI.ArcGIS.Carto.IMap map, ESRI.ArcGIS.Geometry.IEnvelope e) {
             ESRI.ArcGIS.Carto.IGraphicsContainer hawkGC = (ESRI.ArcGIS.Carto.IGraphicsContainer)map;
             ESRI.ArcGIS.Carto.IActiveView aView = (ESRI.ArcGIS.Carto.IActiveView)hawkGC;
             hawkGC.DeleteAllElements();

             ESRI.ArcGIS.Carto.IElement recEle = (ESRI.ArcGIS.Carto.IElement)new ESRI.ArcGIS.Carto.RectangleElementClass();
             recEle.Geometry = e;
             ESRI.ArcGIS.Display.ISimpleLineSymbol outLine = new ESRI.ArcGIS.Display.SimpleLineSymbolClass();
             outLine.Color = ColorPaint(, );
             outLine.Width = ;

             //填充样式.
             ESRI.ArcGIS.Display.ISimpleFillSymbol fillSym = new ESRI.ArcGIS.Display.SimpleFillSymbolClass();
             fillSym.Color = ColorPaint(, );
             fillSym.Outline = outLine;

             ESRI.ArcGIS.Carto.IFillShapeElement fillShape = (ESRI.ArcGIS.Carto.IFillShapeElement)recEle;
             fillShape.Symbol = fillSym;
             hawkGC.AddElement((ESRI.ArcGIS.Carto.IElement)fillShape, );
             aView.PartialRefresh(ESRI.ArcGIS.Carto.esriViewDrawPhase.esriViewGraphics, null, null);
         }

　　4,在查询窗口中,用 GetLayerByName 方法定位好待查询的点要素图层(方法定义为)

 /// <summary>
         /// 根据图层名获取图层.
         /// </summary>
         /// <param name="map"></param>
         /// <param name="layerName">图层名称.</param>
         /// <returns></returns>
         public static ESRI.ArcGIS.Carto.ILayer GetLayerByName(ESRI.ArcGIS.Carto.IMap map, string layerName) {
             ESRI.ArcGIS.Carto.IEnumLayer enunLayer = map.get_Layers(null, false);
             enunLayer.Reset();
             ESRI.ArcGIS.Carto.ILayer resultLayer = null;
             while ((resultLayer = enunLayer.Next()) != null) {
                 if (resultLayer.Name.Equals(layerName)) {
                     break;
                 }
             }
             return resultLayer;
         }

　　5,查询窗口实现查询的所有代码:

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Linq;
 using System.Text;
 using System.Windows.Forms;

 namespace Engine {
     public partial class fQueryInvelopePoints : Form {
         private ESRI.ArcGIS.Carto.IMap map = null;
         private fMain fMain = null;
         public fQueryInvelopePoints(fMain fMain, ESRI.ArcGIS.Carto.IMap map) {
             this.fMain = fMain;
             this.map = map;
             InitializeComponent();
         }

         /// <summary>
         /// 查询指定矩形范围内的点要素.
         /// </summary>
         /// <param name="envelope">指定的矩形范围.</param>
         /// <param name="featureClass">待查询的要素.</param>
         /// <returns>返回结果的游标</returns>
         public ESRI.ArcGIS.Geodatabase.IFeatureCursor GetAllFeaturesFromPointSearchInGeoFeatureLayer(ESRI.ArcGIS.Geometry.IEnvelope envelope, ESRI.ArcGIS.Geodatabase.IFeatureClass featureClass) {
             if (featureClass == null)
                 return null;
             ESRI.ArcGIS.Geodatabase.ISpatialFilter spatialFilter = new ESRI.ArcGIS.Geodatabase.SpatialFilterClass();
             spatialFilter.Geometry = envelope;
             spatialFilter.SpatialRel = ESRI.ArcGIS.Geodatabase.esriSpatialRelEnum.esriSpatialRelEnvelopeIntersects;
             spatialFilter.GeometryField = featureClass.ShapeFieldName;
             return featureClass.Search(spatialFilter, false);
         }

         private void fQueryInvelopePoints_Load(object sender, EventArgs e) {
             Engine.App_Code.Layer_Assist.InitLayers(map, cbox_layer);
         }

         private void btn_query_Click(object sender, EventArgs e) {
             lsbox.Items.Clear();    //清空原始数据.
             ESRI.ArcGIS.Carto.ILayer lyr = Engine.App_Code.Layer_Assist.GetLayerByName(map, cbox_layer.Text);
             if (lyr is ESRI.ArcGIS.Carto.IFeatureLayer) {   //矢量数据.
                 ESRI.ArcGIS.Carto.IFeatureLayer fLyr = (ESRI.ArcGIS.Carto.IFeatureLayer)lyr;
                 ESRI.ArcGIS.Geometry.IEnvelope selEnvelope = fMain.MainInvelopeValue;
                 //获取矩形范围内的要素.
                 ESRI.ArcGIS.Geodatabase.IFeatureCursor fCur = GetAllFeaturesFromPointSearchInGeoFeatureLayer(selEnvelope, fLyr.FeatureClass);
                 ESRI.ArcGIS.Geodatabase.IFeatureClass fc = fLyr.FeatureClass;
                 ESRI.ArcGIS.Geodatabase.IFeature f = null;
                 string v = "";
                 string k = "";
                 k = "name";
                 fMain.mapCtrl_main.ActiveView.Refresh();    //高亮显示前.
                 try {
                     while ((f = fCur.NextFeature()) != null) {
                         map.SelectFeature(fLyr, f); //高亮显示.
                         v = Convert.ToString(f.get_Value(f.Fields.FindField("name")));
                         lsbox.Items.Add(k + " : " + v);
                     }
                 }
                 catch (System.Exception ex) {
                     MessageBox.Show(ex.Message + "不支持查询的图层或查询字段错误:NAME");
                 }
                 fMain.mapCtrl_main.ActiveView.Refresh();    //高亮显示后.
             }
         }
     }
 }

　　6,运行时,画好矩形轮廓后,在主视图控件类中调用即可:

 if (mainInvelope == null || mainInvelope.IsEmpty) {
     MessageBox.Show("画轮廓为空");
     return;
 }
 if (fInvelopePoints == null)
     fInvelopePoints = new fQueryInvelopePoints(this, mapCtrl_main.Map);
 fInvelopePoints.FormClosed += (s, ea) => {
     fInvelopePoints = null;
 };
 fInvelopePoints.Show(this);

其中 fInvelopePoints 为定义在主视图类中的查询窗口的成员变量:

 //查询窗口.
 private fQueryInvelopePoints fInvelopePoints = null;

附

　　在主视图中画矩形轮廓如图:

　　查询后,弹出查询结果如图: