要编辑要素，首先要选中要素，按shift键进行多选，按esc键清空选择。
个人了解的选择高亮显示有两种方式，都是在public override void OnMouseDown(int Button, int Shift, int X, int Y)事件中处理实现：
1、 IFeatureSelection 这个要求明确选择的图层
IPoint pPoint = pActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(X, Y);
IEnvelope pEnvelope;
double tol = 20;
pEnvelope = pPoint.Envelope;
pEnvelope.Width = pEnvelope.Width + tol;
pEnvelope.Height = pEnvelope.Height + tol;
pEnvelope.CenterAt(pPoint);
ISpatialFilter pSpatialFilter;
pSpatialFilter = new SpatialFilterClass();
pSpatialFilter.Geometry = pEnvelope;
pSpatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects;
IFeatureSelection pFeatureSelection;
pFeatureSelection = ucDrawPanel.currentFeatureLayer as IFeatureSelection;
IFeature pFeature;
ucDrawPanel.unionFeature = new List<IFeature>();//实例化合并要素集
if (Shift == 1)
{
if (ucDrawPanel.currentFeatureLayer.FeatureClass.ShapeType == esriGeometryType.esriGeometryPolyline)
{
pFeatureSelection.SelectFeatures(pSpatialFilter,
esriSelectionResultEnum.esriSelectionResultAdd, true);
ICursor pCursor;
pFeatureSelection.SelectionSet.Search(null, false, out pCursor);
}
}
else
{
pActiveView.FocusMap.ClearSelection();
pFeatureSelection.SelectFeatures(pSpatialFilter,
esriSelectionResultEnum.esriSelectionResultNew, true);
ICursor pCursor;
pFeatureSelection.SelectionSet.Search(null, false, out pCursor);
}
pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeoSelection, ucDrawPanel.currentFeatureLayer, null);
//高亮显示出来
ISimpleFillSymbol iFillSymbol;
ISymbol iSymbol;
IRgbColor iRgbColor;
iFillSymbol = new SimpleFillSymbol();
iFillSymbol.Style = esriSimpleFillStyle.esriSFSSolid;
iRgbColor = new RgbColor();
iRgbColor.Green = 128;
iFillSymbol.Color = iRgbColor;
iSymbol = (ISymbol)iFillSymbol;
iSymbol.ROP2 = esriRasterOpCode.esriROPNotXOrPen;
IEnumFeature pEnumFeature = pActiveView.FocusMap.FeatureSelection as IEnumFeature;
pEnumFeature.Reset();
pFeature = pEnumFeature.Next();
//选中要素高亮显示
if (pFeature != null)
{
IGeometry pGeometry = pFeature.Shape;
ITopologicalOperator pTop = pGeometry as ITopologicalOperator;
while (pFeature != null)
{
ucDrawPanel.unionFeature.Add(pFeature);
pGeometry = pTop.Union(pFeature.Shape);
pTop = pGeometry as ITopologicalOperator;
pFeature = pEnumFeature.Next();
}
ucDrawPanel.currentFeature = ucDrawPanel.unionFeature[ucDrawPanel.unionFeature.Count - 1];
_mapCtrl.FlashShape(pGeometry, 1, 500, iSymbol);
}
//清空选择要素
else
{
pActiveView.FocusMap.ClearSelection();
pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeoSelection, null, pActiveView.Extent);
}
2、 SelectByMap 基于整个地图，当然也可以先将图层的selectable属性动态设置下
if (Button == 1)
{
//清空地图视图
_mapCtrl.Map.ClearSelection();
IGraphicsContainer pContainer = _mapCtrl.Map as IGraphicsContainer;
pContainer.DeleteAllElements();
_mapCtrl.ActiveView.Refresh();
base.OnMouseDown(Button, Shift, X, Y);
IActiveView pActiveView = _mapCtrl.ActiveView;
IPoint pPoint = pActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(X, Y);
IPoint TempPoint = pActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(X + 5, Y + 5);
IEnvelope objEnvelope;
double tol = Math.Abs(TempPoint.X - pPoint.X);
objEnvelope = pPoint.Envelope;
objEnvelope.Width = objEnvelope.Width + tol;
objEnvelope.Height = objEnvelope.Height + tol;
objEnvelope.CenterAt(pPoint);
setSelectable(ucDrawPanel.currentLayerName);//只有当前编辑图层可选
_mapCtrl.Map.SelectByShape((IGeometry)objEnvelope, null, true);//只选择一个要素
pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeoSelection, null, _mapCtrl.ActiveView.Extent);
ucDrawPanel.currentFeatureLayer = GetLayerByName(_mapCtrl, ucDrawPanel.currentLayerName);
if (ucDrawPanel.currentFeatureLayer != null)
{
ucDrawPanel.currentFeature = GetFeatureBySelection(ucDrawPanel.currentFeatureLayer);
}
else
{
MessWin messWin = new MessWin();
messWin.SetTitleAndMess("提示", @"获取选择要素出错！", false);
return;
}
}
PS：esc键退出，在OnKeyDown事件中实现
public override void OnKeyDown(int keyCode, int Shift)
{
if (keyCode == (int)Keys.Escape)
{
IActiveView pActiveView = _mapCtrl.ActiveView;
pActiveView.FocusMap.ClearSelection();
pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeoSelection, null, pActiveView.Extent);
_mapCtrl.CurrentTool = null;
}
}
