IFeatureSelection

本文介绍了一种使用ArcGIS进行地图特征选择的方法。通过设置查询过滤器,仅选择人口超过20万的区域,并更新视图以显示所选特征。最后报告了所选特征的数量。

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Public Sub SelFeatures()
  Dim pMxDoc As IMxDocument
  Dim pMap As IMap
  Dim pFeatSel As IFeatureSelection
  Dim pQF As IQueryFilter
  Dim pSelSet As ISelectionSet
  
  Set pMxDoc = Application.Document
  Set pMap = pMxDoc.FocusMap
  Set pFeatSel = pMap.Layer(0)
  
  ' set up query filter with where clause
  Set pQF = New QueryFilter
  pQF.WhereClause = "POP2000 > 200000"
  
  ' perform selection
  pFeatSel.SelectFeatures pQF, esriSelectionResultNew, False
  pFeatSel.SelectionChanged
  pMxDoc.ActiveView.PartialRefresh esriViewGeography, Nothing, Nothing
  
  ' report number of selected features
  Set pSelSet = pFeatSel.SelectionSet
  MsgBox pSelSet.Count
  
End Sub
 
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; using ESRI.ArcGIS.Carto; using ESRI.ArcGIS.Controls; using ESRI.ArcGIS.esriSystem; using ESRI.ArcGIS.Geometry; using ESRI.ArcGIS.Geodatabase; using ESRI.ArcGIS.Display; namespace WaterPipelineGIS2 { public partial class Form1 : Form { private IFeatureLayer _selectedFeatureLayer; private System.Drawing.Point _lastRightClickPosition; private enum SelectionMode { None, Rectangle, Circle, Polygon, Polyline } private SelectionMode currentMode = SelectionMode.None; private enum MeasureMode { None, Area, Length, Point } private MeasureMode currentMeasureMode = MeasureMode.None; private IGeometry tempGeometry; private IPointCollection pointCollection; private Label lblMeasureResult; private IGraphicsContainer _spatialSelectionGraphics; // 空间选择图形容器 private IGraphicsContainer _attributeHighlightGraphics; // 属性表高亮图形容器 public Form1() { InitializeComponent(); axMapControl1.OnMouseMove += new IMapControlEvents2_Ax_OnMouseMoveEventHandler(axMapControl1_OnMouseMove); } private void axMapControl1_OnMouseMove(object sender, IMapControlEvents2_OnMouseMoveEvent e) { // 获取地图坐标 double mapX = e.mapX; double mapY = e.mapY; // 格式化坐标显示(保留3位小数) lblCoordinate.Text = string.Format("X: {0:F3} Y: {1:F3}", mapX, mapY); // 立即刷新状态栏 statusStrip1.Refresh(); } private void toolStripMenuItem2_Click(object sender, EventArgs e) { using (var rotateForm = new RotateForm()) { if (rotateForm.ShowDialog() == DialogResult.OK) { try { axMapControl1.Rotation = rotateForm.RotationAngle; axMapControl1.ActiveView.Refresh(); // 可选:更新状态栏 lblCoordinate.Text += " 旋转角度:{rotateForm.RotationAngle}°"; } catch (Exception ex) { MessageBox.Show("旋转失败:{ex.Message}"); } } } } private void axTOCControl1_OnMouseDown(object sender, ITOCControlEvents_OnMouseDownEvent e) { if (e.button == 2) // 右键 { // 保存点击位置(控件坐标系) _lastRightClickPosition = new System.Drawing.Point(e.x, e.y); ITOCControl2 tocControl = (ITOCControl2)axTOCControl1.Object; // 修改点1:声明为接口类型并初始化为null IBasicMap basicMap = null; ILayer layer = null; // 修改点2:使用Type.Missing代替new object() object other = Type.Missing; object index = Type.Missing; esriTOCControlItem itemType = esriTOCControlItem.esriTOCControlItemNone; // 修改点3:正确传递ref参数 tocControl.HitTest(e.x, e.y, ref itemType, ref basicMap, ref layer, ref other, ref index); if (itemType == esriTOCControlItem.esriTOCControlItemLayer && layer != null) { contextMenuStripTOC.Show(axTOCControl1, e.x, e.y); } } } // 修改后(使用 MouseEventArgs) private void openAttributeTableToolStripMenuItem_Click(object sender, EventArgs e) { ITOCControl2 tocControl = (ITOCControl2)axTOCControl1.Object; IBasicMap basicMap = null; ILayer layer = null; object other = Type.Missing; object index = Type.Missing; esriTOCControlItem itemType = esriTOCControlItem.esriTOCControlItemNone; // 获取当前鼠标位置(屏幕坐标系) System.Drawing.Point screenPos = contextMenuStripTOC.PointToClient(Control.MousePosition); // 转换为控件坐标系 System.Drawing.Point controlPos = axTOCControl1.PointToClient(Control.MousePosition); tocControl.HitTest( controlPos.X, controlPos.Y, ref itemType, ref basicMap, ref layer, ref other, ref index ); IFeatureLayer featureLayer = layer as IFeatureLayer; if (featureLayer != null) { _selectedFeatureLayer = featureLayer; AttributeTableForm attrForm = new AttributeTableForm( _selectedFeatureLayer, this // 传递主窗体引用 ); attrForm.Show(); } } private void SetSelectionSymbol() { // 使用接口创建符号 ISimpleFillSymbol fillSymbol = new SimpleFillSymbol() as ISimpleFillSymbol; fillSymbol.Color = GetRgbColor(255, 0, 0); fillSymbol.Style = esriSimpleFillStyle.esriSFSSolid; ISimpleLineSymbol lineSymbol = new SimpleLineSymbol() as ISimpleLineSymbol; lineSymbol.Color = GetRgbColor(255, 255, 0); lineSymbol.Width = 2; fillSymbol.Outline = lineSymbol; // 设置渲染器 if (_selectedFeatureLayer != null) { IGeoFeatureLayer geoLayer = (IGeoFeatureLayer)_selectedFeatureLayer; ISimpleRenderer renderer = new SimpleRenderer() as ISimpleRenderer; renderer.Symbol = (ISymbol)fillSymbol; geoLayer.Renderer = (IFeatureRenderer)renderer; axMapControl1.ActiveView.Refresh(); } } private IRgbColor GetRgbColor(int r, int g, int b) { IRgbColor color = new RgbColor() as IRgbColor; // 正确方式 color.Red = r; color.Green = g; color.Blue = b; return color; } public void ActivateFeatureLayer(IFeatureLayer featureLayer) { if (featureLayer == null) return; // 1. 设置当前活动图层 _selectedFeatureLayer = featureLayer; // 2. 刷新地图显示(可选) axMapControl1.ActiveView.Refresh(); // 3. 更新TOC控件的选中状态(可选) axTOCControl1.Update(); } // 修改 HighlightAndZoomToFeature 方法实现 public void HighlightAndZoomToFeature(IFeatureLayer featureLayer, int oid) { try { if (featureLayer == null || featureLayer.FeatureClass == null) { MessageBox.Show("图层或要素类无效!"); return; } // 获取要素并检查有效性 IFeature feature = featureLayer.FeatureClass.GetFeature(oid); if (feature == null || feature.Shape == null) { MessageBox.Show("要素 OID {oid} 不存在或无几何!"); return; } IGeometry geometry = feature.Shape; IEnvelope envelope = geometry.Envelope; // 确保包络线有效 if (envelope.IsEmpty || envelope.Width == 0 || envelope.Height == 0) { envelope.Expand(10, 10, true); // 手动扩大点要素范围 } else { envelope.Expand(1.5, 1.5, true); } // 缩放到要素范围 axMapControl1.Extent = envelope; axMapControl1.ActiveView.ScreenDisplay.UpdateWindow(); // 高亮几何 HighlightGeometry(geometry); } catch (Exception ex) { MessageBox.Show("高亮要素失败: {ex.Message}"); } } public object _featureLayer { get; set; } // 矩形选择 private void btnRectSelect_Click(object sender, EventArgs e) { currentMode = SelectionMode.Rectangle; axMapControl1.CurrentTool = null; } // 圆形选择 private void btnCircleSelect_Click(object sender, EventArgs e) { currentMode = SelectionMode.Circle; axMapControl1.CurrentTool = null; } // 多边形选择 private void btnPolygonSelect_Click(object sender, EventArgs e) { currentMode = SelectionMode.Polygon; axMapControl1.CurrentTool = null; } // 折线选择 private void btnLineSelect_Click(object sender, EventArgs e) { currentMode = SelectionMode.Polyline; axMapControl1.CurrentTool = null; } // 地图鼠标按下事件 private void axMapControl1_OnMouseDown(object sender, IMapControlEvents2_OnMouseDownEvent e) { try { IGeometry geometry = null; switch (currentMode) { case SelectionMode.Rectangle: // 绘制矩形(返回的是IEnvelope) geometry = axMapControl1.TrackRectangle(); break; case SelectionMode.Circle: IEnvelope envelope = axMapControl1.TrackRectangle(); if (envelope.Width <= 0 || envelope.Height <= 0) { MessageBox.Show("请拖拽有效的矩形范围以创建圆形!"); return; } // 创建圆心点 IPoint center = new PointClass(); center.PutCoords( (envelope.XMin + envelope.XMax) / 2, (envelope.YMin + envelope.YMax) / 2 ); // 计算半径(取矩形宽高的平均值) double radius = Math.Max(envelope.Width, envelope.Height) / 2; // 创建圆形几何 ICircularArc circularArc = new CircularArcClass(); IConstructCircularArc constructArc = (IConstructCircularArc)circularArc; constructArc.ConstructCircle(center, radius, true); // 将圆弧转换为多边形 ISegmentCollection segColl = new PolygonClass(); segColl.AddSegment((ISegment)circularArc); geometry = (IGeometry)segColl; geometry.SpatialReference = axMapControl1.SpatialReference; break; case SelectionMode.Polygon: // 绘制多边形 geometry = axMapControl1.TrackPolygon(); break; case SelectionMode.Polyline: // 绘制折线 geometry = axMapControl1.TrackLine(); break; } if (geometry != null) { PerformSpatialSelection(geometry); HighlightGeometry(geometry); } } catch (Exception ex) { MessageBox.Show("操作失败: {ex.Message}", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error); } } // 执行空间选择 private void PerformSpatialSelection(IGeometry geometry) { try { IMap map = axMapControl1.Map; if (map == null) return; map.ClearSelection(); for (int i = 0; i < map.LayerCount; i++) { IFeatureLayer featureLayer = map.get_Layer(i) as IFeatureLayer; if (featureLayer == null || !featureLayer.Valid || featureLayer.FeatureClass == null) continue; // 检查几何类型是否支持空间查询 if (geometry.GeometryType == esriGeometryType.esriGeometryPoint && featureLayer.FeatureClass.ShapeType != esriGeometryType.esriGeometryPoint) continue; ISpatialFilter filter = new SpatialFilterClass { Geometry = geometry, GeometryField = featureLayer.FeatureClass.ShapeFieldName, SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects }; IFeatureSelection selection = (IFeatureSelection)featureLayer; selection.SelectFeatures(filter, esriSelectionResultEnum.esriSelectionResultNew, false); } axMapControl1.Refresh(esriViewDrawPhase.esriViewGeoSelection, null, null); } catch (Exception ex) { MessageBox.Show("空间查询失败: {ex.Message}"); } } // 高亮显示选择图形(修复版) private void HighlightGeometry(IGeometry geometry) { if (geometry == null || geometry.IsEmpty) { MessageBox.Show("几何无效!"); return; } IGraphicsContainer graphicsContainer = axMapControl1.Map as IGraphicsContainer; graphicsContainer.DeleteAllElements(); // 清除旧图形 // 创建符号和元素 IElement element = null; ISymbol symbol = null; switch (geometry.GeometryType) { case esriGeometryType.esriGeometryPolygon: case esriGeometryType.esriGeometryEnvelope: ISimpleFillSymbol fillSymbol = new SimpleFillSymbolClass { Color = GetRgbColor(255, 0, 0, 80), Style = esriSimpleFillStyle.esriSFSSolid }; fillSymbol.Outline = new SimpleLineSymbolClass { Color = GetRgbColor(255, 0, 0), Width = 2 }; symbol = (ISymbol)fillSymbol; element = new PolygonElementClass(); break; case esriGeometryType.esriGeometryPolyline: ISimpleLineSymbol lineSymbol = new SimpleLineSymbolClass { Color = GetRgbColor(255, 0, 0), Width = 3 }; symbol = (ISymbol)lineSymbol; element = new LineElementClass(); break; case esriGeometryType.esriGeometryPoint: ISimpleMarkerSymbol markerSymbol = new SimpleMarkerSymbolClass { Color = GetRgbColor(255, 0, 0), Size = 12, Style = esriSimpleMarkerStyle.esriSMSCircle }; symbol = (ISymbol)markerSymbol; element = new MarkerElementClass(); break; } if (element != null && symbol != null) { element.Geometry = geometry; graphicsContainer.AddElement(element, 0); axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null); } } private IColor GetRgbColor(int p, int p_2, int p_3, int p_4) { throw new NotImplementedException(); } // 创建颜色对象 private IRgbColor GetRGBColor(int r, int g, int b, int alpha = 255) { IRgbColor color = new RgbColorClass(); color.Red = r; color.Green = g; color.Blue = b; color.Transparency = (byte)(255 - alpha); return color; } // 清除选择 private void btnClearSelection_Click(object sender, EventArgs e) { axMapControl1.Map.ClearSelection(); IGraphicsContainer graphicsContainer = axMapControl1.Map as IGraphicsContainer; graphicsContainer.DeleteAllElements(); axMapControl1.Refresh(); } // 新增双击事件处理 private void axMapControl1_OnDoubleClick(object sender, IMapControlEvents2_OnDoubleClickEvent e) { if (currentMode != SelectionMode.None) { currentMode = SelectionMode.None; axMapControl1.CurrentTool = null; axMapControl1.MousePointer = esriControlsMousePointer.esriPointerDefault; } } // 添加量测按钮点击事件 private void btnMeasureArea_Click(object sender, EventArgs e) { ResetMeasureMode(MeasureMode.Area); lblMeasureResult.Text = "状态:绘制多边形(双击结束)"; } private void btnMeasureLength_Click(object sender, EventArgs e) { ResetMeasureMode(MeasureMode.Length); lblMeasureResult.Text = "状态:绘制折线(双击结束)"; } private void btnMeasurePoint_Click(object sender, EventArgs e) { ResetMeasureMode(MeasureMode.Point); lblMeasureResult.Text = "状态:移动鼠标查看坐标"; } private void ResetMeasureMode(MeasureMode mode) { currentMeasureMode = mode; ClearTempGraphics(); axMapControl1.CurrentTool = null; axMapControl1.MousePointer = esriControlsMousePointer.esriPointerCrosshair; } private void ClearTempGraphics() { throw new NotImplementedException(); } // 修改后的地图鼠标事件处理 private void axMapControl1_OnMouseDown2(object sender, IMapControlEvents2_OnMouseDownEvent e) { try { if (currentMeasureMode == MeasureMode.None) return; IPoint currentPoint = axMapControl1.ActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(e.x, e.y); switch (currentMeasureMode) { case MeasureMode.Area: case MeasureMode.Length: if (pointCollection == null) { // 🟢 根据模式创建不同几何类型 pointCollection = currentMeasureMode == MeasureMode.Area ? (IPointCollection)new PolygonClass() : (IPointCollection)new PolylineClass(); pointCollection.AddPoint(currentPoint); } pointCollection.AddPoint(currentPoint); DrawTempGeometry(); break; } } catch (Exception ex) { MessageBox.Show("操作错误:{ex.Message}", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error); } } private void DrawTempGeometry() { throw new NotImplementedException(); } } }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; using ESRI.ArcGIS.Carto; using ESRI.ArcGIS.Display; using ESRI.ArcGIS.Controls; using ESRI.ArcGIS.Geodatabase; namespace WaterPipelineGIS2 { public partial class AttributeTableForm : Form { private IFeatureLayer _featureLayer; private Form1 _mainForm; // 主窗体引用 public AttributeTableForm(IFeatureLayer featureLayer, Form1 mainForm) { InitializeComponent(); _featureLayer = featureLayer; _mainForm = mainForm; // 绑定数据 BindData(); // 绑定行选择事件 dgvAttributes.SelectionChanged += DgvAttributes_SelectionChanged; // 添加行双击事件 dgvAttributes.CellDoubleClick += (s, args) => { if (args.RowIndex >= 0) { int oid = Convert.ToInt32(dgvAttributes.Rows[args.RowIndex].Cells[0].Value); _mainForm.ActivateFeatureLayer(_featureLayer); _mainForm.HighlightAndZoomToFeature(_featureLayer, oid); } }; } private void DgvAttributes_SelectionChanged(object sender, EventArgs e) { if (dgvAttributes.SelectedRows.Count == 0) return; // 获取当前行的 OID int oid = Convert.ToInt32(dgvAttributes.SelectedRows[0].Cells[0].Value); // 激活主窗体的图层 _mainForm.ActivateFeatureLayer(_featureLayer); // 调用主窗体的高亮方法(传递当前图层) _mainForm.HighlightAndZoomToFeature(_featureLayer, oid); } private void BindData() { IFeatureCursor cursor = _featureLayer.FeatureClass.Search(null, true); DataTable dataTable = new DataTable(); // 添加 OID 字段(关键修改:使用要素类的 OID 字段名) dataTable.Columns.Add(_featureLayer.FeatureClass.OIDFieldName, typeof(int)); // 自动获取系统 OID 字段名 // 添加其他字段 for (int i = 0; i < cursor.Fields.FieldCount; i++) { IField field = cursor.Fields.get_Field(i); if (field.Type == esriFieldType.esriFieldTypeOID) continue; // 跳过已添加的 OID 字段 dataTable.Columns.Add(field.Name, GetFieldType(field.Type)); } // 填充数据 IFeature feature; while ((feature = cursor.NextFeature()) != null) { DataRow row = dataTable.NewRow(); row[0] = feature.OID; // 直接使用 OID 属性 for (int i = 0; i < cursor.Fields.FieldCount; i++) { IField field = cursor.Fields.get_Field(i); if (field.Type == esriFieldType.esriFieldTypeOID) continue; row[field.Name] = feature.get_Value(i) ?? DBNull.Value; } dataTable.Rows.Add(row); } dgvAttributes.DataSource = dataTable; } // 辅助方法:将 ArcGIS 字段类型转换为 .NET 类型 private Type GetFieldType(esriFieldType fieldType) { switch (fieldType) { case esriFieldType.esriFieldTypeString: return typeof(string); case esriFieldType.esriFieldTypeInteger: return typeof(int); case esriFieldType.esriFieldTypeDouble: return typeof(double); case esriFieldType.esriFieldTypeDate: return typeof(DateTime); default: return typeof(string); } } } } 此代码能进行空间选择,但是绘制后会弹出报错窗口,且之前绘制后会暂时留下的红色区域不见了,如何解决
07-13
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