屬性查詢（2）

使用IGeometry介面TrackPolygon方法建立物件實現屬性查詢
使用ISpatialFilter介面SpatialRel屬性定義Intersects取交集為查詢物件
之後將查詢到的（FindField方法）屬性顯示在新的windowsform中的listbox中顯示屬性欄位
單擊Listbox中的屬性欄位，地圖高亮顯示對應多邊形

新增引用：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using ESRI.ArcGIS.Carto
 
;
using ESRI.ArcGIS.SystemUI;
using ESRI.ArcGIS.esriSystem;
using ESRI.ArcGIS.Controls;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.Geodatabase;
using ESRI.ArcGIS.DataSourcesFile;

新增ToolTripButton,新增Click事件程式碼如下

ICommand spatialqueryintersect = new spatialquery();
spatialqueryintersect.OnCreate
 
(axMapControl1.Object);
spatialqueryintersect.OnClick();
ITool ptool = spatialqueryintersect as ITool;
axMapControl1.CurrentTool = ptool;

新建windowsform窗體，並在裡邊新增Listbox,Modifiers屬性Public，否則在其他窗體的事件程式碼中不能檢測到該控制元件，事件程式碼如下

//定義全域性變數
public IMapControlDefault spaqury;//必須新增public關鍵字，因為要從新建的類中傳來Imapcontrol物件
 

//
 private void listBox1_Click(object sender, EventArgs e)
        {
            IFeatureLayer pFeatureLayer = spaqury.get_Layer(0) as     IFeatureLayer;
            IQueryFilter pqueryfilter = new QueryFilterClass();
            pqueryfilter.SubFields = "*";
            pqueryfilter.WhereClause = "NAME" + "=" + "'" + this.listBox1.SelectedItem.ToString() + "'";
            IFeatureCursor pfeaturecursor = pFeatureLayer.Search(pqueryfilter, false);
            IFeature pfeature = pfeaturecursor.NextFeature();
            spaqury.FlashShape(pfeature.Shape, 3, 500, null);
            return; 
        }

新建類庫，手動實現Icommand,ITool 介面，定義全域性變數：

IMapControlDefault m_app;

//Onclick函式設為空，因為單擊Button沒有立刻開始畫多邊形，而是在單擊axmapcontrol物件以後開始畫
public void OnClick()
        {

        }

//傳入ImapControl物件
public void OnCreate(object Hook)
        {
            m_app = Hook as IMapControlDefault;
        }

//其他介面置為空
public void OnMouseDown(int button, int shift, int x, int y)
        {
            IGeometry pGeometry = m_app.TrackPolygon();
            IFeatureLayer pfeatureLayer = m_app.get_Layer(0) as IFeatureLayer;
            ISpatialFilter pSpatialfilter =new SpatialFilterClass();
            pSpatialfilter.SubFields="*";
            pSpatialfilter.GeometryField="shape";//所畫圖形型別
            pSpatialfilter.Geometry=pGeometry;
            pSpatialfilter.SpatialRel=esriSpatialRelEnum.esriSpatialRelIntersects;//空間交集
            IFeatureCursor pfeaturecursor = pfeatureLayer.Search(pSpatialfilter, false);
            IFeature pfeature = pfeaturecursor.NextFeature();
            int ifname = pfeaturecursor.FindField("NAME");//屬性查詢欄位
            SpatialQueryListBox listboxwindows = new SpatialQueryListBox();//SpatialQueryListBox為新建的windowsform窗體
            listboxwindows.spaqury = m_app;//該窗體中的全域性變數
            while (pfeature != null)
            {
                listboxwindows.listBox1.Items.Add(pfeature.get_Value(ifname).ToString());
                m_app.FlashShape(pfeature.Shape, 3, 500, null);
                pfeature = pfeaturecursor.NextFeature();
            }
            listboxwindows.Show();
        }