C# ArcGIS Engine /AO 线打断 方法

// <summary>
/// 打断线，用于在点击点处，打断该条线
/// </summary>
/// <param name="t_pLineFeatureClass">线图层</param>
/// <param name="t_pPoint">点击的点</param>
public static void SplitePolylineByHitPoint(IFeatureClass t_pLineFeatureClass, IPoint t_pPoint)
{

IFeatureClass pFeatureClass = t_pLineFeatureClass;
IFeatureCursor pFeatureCursor;
IFeature pFeature;
pFeatureCursor = pFeatureClass.Search(null, false);
pFeature = pFeatureCursor.NextFeature();

IDataset dataset = (IDataset)pFeatureClass;
IWorkspace workspace = dataset.Workspace;
IWorkspaceEdit workspaceEdit = (IWorkspaceEdit)workspace;

IRelationalOperator pRelationalOperator;
//遍历featureClass找到点中的那条线
while (pFeature != null)
{
pRelationalOperator = (IRelationalOperator) pFeature.Shape;
bool bHasCrosses = pRelationalOperator.Contains(t_pPoint);
if (bHasCrosses)
{
//对那条线在点击点处，进行打断
IPolycurve pPolycurve = (IPolycurve) pFeature.Shape;
bool HasSplitHappened;
int newPartIndex;
int newSegmentIndex;
//打断
pPolycurve.SplitAtPoint(t_pPoint, false, true, out HasSplitHappened, out newPartIndex,
out newSegmentIndex);
if (HasSplitHappened)
{
//从GeometryCollection中分离出打断后的要素，并生成新的要素，并赋于属性
IFeature pNewFeature;
IGeometryCollection pGeometryCollection = (IGeometryCollection) pPolycurve;

for (int i = 0; i < pGeometryCollection.GeometryCount; i++)
{
//生成新的要素
workspaceEdit.StartEditing(false);
workspaceEdit.StartEditOperation();
pNewFeature = pFeatureClass.CreateFeature();
IGeometryCollection pline = new PolylineClass();
IGeometry pGeo = pGeometryCollection.get_Geometry(i);
pline.AddGeometries(1, ref pGeo);
pNewFeature.Shape = (IPolyline) pline;
pNewFeature.Store();
workspaceEdit.StopEditOperation();
workspaceEdit.StopEditing(true);
#region 属性复制（注释掉）
//IRow pRow = (IRow) pFeature;
//int intIndex = pRow.Fields.FindField("CRoadID");
//进行属性复制
//for (int k = 2; k < pRow.Fields.FieldCount - 3; k++) //前后几个属性字段不添加
//{
//    if (pRow.Fields.get_Field(k).Name == "Shape_Length")
//    {
//        continue;
//    }
//    if (k != intIndex)
//    {
//        if (!pRow.get_Value(k).ToString().Equals(""))
//        {

//            pNewFeature.set_Value(k, pRow.get_Value(k));
//        }
//    }
//    else
//    {
//        if (k == 0)
//        {
//            if (!pRow.get_Value(k).ToString().Equals(""))
//            {
//                pNewFeature.set_Value(k, pRow.get_Value(k));
//            }
//        }
//        else
//        {

//            if (!pRow.get_Value(k).ToString().Equals(""))
//            {
//                int intNO = System.Convert.ToInt32(pRow.get_Value(k).ToString()) + 1000*i;
//                pNewFeature.set_Value(k, intNO);
//            }
//        }
//    }
//}
//pNewFeature.Store();
#endregion
}
pFeature.Delete();
}
}
pFeature = pFeatureCursor.NextFeature();
}
}