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在一般的GIS数据编辑中，利用线分割面是常见的一项操作。很多同志不清楚如何在ArcEngine实现这一功能，其代码写得无比复杂。其实ArcEngine给我们提供了一个接口：IFeatureConstruction，利用这个接口可以轻松完成线分割面的操作。下面给出示例代码。
情况一：利用选中的线要素分割面要素
如下图所示：当前选择了两条线要素，我希望用这两条选中的线对面进行分割，这种情况在编辑流程中很常见。  代码如下：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Controls;
using ESRI.ArcGIS.DataSourcesFile;
using ESRI.ArcGIS.DataSourcesGDB;
using ESRI.ArcGIS.Display;
using ESRI.ArcGIS.esriSystem;
using ESRI.ArcGIS.Geodatabase;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.Output;
using ESRI.ArcGIS.SystemUI;
namespace WindowsFormsApplication1
{
public partial class MainForm : Form
{
public MainForm()
{
InitializeComponent();
axMapControl1.LoadMxFile(@"C:\Users\DSF\Desktop\data\无标题.mxd");
}
// 分割
private void btnSplitPolygon_Click(object sender, EventArgs e)
{
// 面要素
IFeatureLayer pPolygonFeatureLayer = axMapControl1.get_Layer(1) as IFeatureLayer;
IFeatureClass pPolygonFeatureClass = pPolygonFeatureLayer.FeatureClass;
// 面要素范围
IGeoDataset pGeoDataset = pPolygonFeatureClass as IGeoDataset;
IEnvelope pEnvelope = pGeoDataset.Extent;
// 获取被选择的线要素
ISelection pSelection = axMapControl1.Map.FeatureSelection;
IEnumFeature pEnumFeature = pSelection as IEnumFeature;
// 线分割面
IFeatureConstruction pFeatureConstruction = new FeatureConstruction();
pFeatureConstruction.SplitPolygonsWithLines(null, pPolygonFeatureClass, pEnvelope, pEnumFeature, null, 0.001);
}
}
}
分割结果如下图所示： 
情况二：利用线图层批量分割面要素
第一种情况需要先在地图上选择线要素，然后才能进行分割操作，如果遇到数据量较大的情况未免有些繁琐。我们同样可以利用线图层批量分割面要素，如下图所示：我希望直接用线要素图层中的所有线要素分割面要素图层。  代码如下：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Controls;
using ESRI.ArcGIS.DataSourcesFile;
using ESRI.ArcGIS.DataSourcesGDB;
using ESRI.ArcGIS.Display;
using ESRI.ArcGIS.esriSystem;
using ESRI.ArcGIS.Geodatabase;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.Output;
using ESRI.ArcGIS.SystemUI;
namespace WindowsFormsApplication1
{
public partial class MainForm : Form
{
public MainForm()
{
InitializeComponent();
axMapControl1.LoadMxFile(@"C:\Users\DSF\Desktop\data\无标题.mxd");
}
// 分割
private void btnSplitPolygon_Click(object sender, EventArgs e)
{
// 线要素
IFeatureLayer pPolylineFeatureLayer = axMapControl1.get_Layer(0) as IFeatureLayer;
IFeatureClass pPolylineFeatureClass = pPolylineFeatureLayer.FeatureClass;
IFeatureCursor pPolylineFeatureCursor = pPolylineFeatureClass.Search(null, true);
// 面要素
IFeatureLayer pPolygonFeatureLayer = axMapControl1.get_Layer(1) as IFeatureLayer;
IFeatureClass pPolygonFeatureClass = pPolygonFeatureLayer.FeatureClass;
// 面要素范围
IGeoDataset pGeoDataset = pPolygonFeatureClass as IGeoDataset;
IEnvelope pEnvelope = pGeoDataset.Extent;
// 分割面
IInvalidArea pInvalidArea = new InvalidArea();
IFeatureConstruction pFeatureConstruction = new FeatureConstruction();
pFeatureConstruction.SplitPolygonsWithLinesFromCursor(null, pPolygonFeatureClass, pEnvelope, pPolylineFeatureCursor, pInvalidArea, 0.001);
}
}
}
分割结果如下图所示： 
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