屬性查詢（2）

使用IGeometry接口TrackPolygon方法建立對象實現屬性查詢
使用ISpatialFilter接口SpatialRel屬性定義Intersects取交集為查詢對象
之后將查詢到的（FindField方法）屬性顯示在新的windowsform中的listbox中顯示屬性字段
單擊Listbox中的屬性字段，地圖高亮顯示對應多邊形

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添加引用：

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;

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添加ToolTripButton,添加Click事件代碼如下

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

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新建windowsform窗體，并在里邊添加Listbox,Modifiers屬性Public，否則在其他窗體的事件代碼中不能檢測到該控件，事件代碼如下

//定義全局變量 public IMapControlDefault spaqury;//必須添加public關鍵字，因為要從新建的類中傳來Imapcontrol對象 //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; }

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新建類庫，手動實現Icommand,ITool 接口，定義全局變量：

IMapControlDefault m_app; //Onclick函數設為空，因為單擊Button沒有立刻開始畫多邊形，而是在單擊axmapcontrol對象以后開始畫 public void OnClick(){} //傳入ImapControl對象 public void OnCreate(object Hook){m_app = Hook as IMapControlDefault;} //其他接口置為空 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";//所畫圖形類型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");//屬性查詢字段SpatialQueryListBox listboxwindows = new SpatialQueryListBox();//SpatialQueryListBox為新建的windowsform窗體listboxwindows.spaqury = m_app;//該窗體中的全局變量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();}

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