查询包含光标所在点的要素，进行删除。记得
//开始编辑
IWorkspaceEdit workspaceEdit;
IWorkspace workspace;
workspaceEdit.StartEditing(true);
workspaceEdit.StartEditOperation();
//删除要素
IDataset dataset = r2.FeatureClass as IDataset;
workspace = dataset.Workspace;
workspaceEdit = workspace as IWorkspaceEdit;
//找到要删除的要素
IPoint pPoint = new PointClass();
pPoint.PutCoords(e.mapX, e.mapY);
IFeatureLayer pFeatureLayer = new FeatureLayerClass();
for (int i = 0; i < axMapControl1.LayerCount; i++)
{
ILayer ptempLayer = axMapControl1.get_Layer(i);
if (ptempLayer.Name == "样本矢量")
pFeatureLayer = ptempLayer as IFeatureLayer;
}
ISpatialFilter spatialFilter = new SpatialFilterClass();
spatialFilter.Geometry=pPoint;
spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelWithin;
IFeatureClass featureClass = pFeatureLayer.FeatureClass;
IFeatureCursor featureCursor;
featureCursor = featureClass.Search(spatialFilter, false);
IFeature pFeature = featureCursor.NextFeature();
if(pFeature!=null)
{
pFeature.Delete();
}
axMapControl1.Refresh();
//结束编辑
workspaceEdit.StopEditOperation();
workspaceEdit.StopEditing(true);
