PolyLine 多次打断操作

代码来源：https://www.cnblogs.com/shizhenkun/p/5556478.html

​ 一条线（Polyline）被另外一条线多次（Polyline）切割，也就是说打断的点有多个，而AE中的IFeatureEdit.Split()只能是一个点一个点的处理

public void LineSplit(IFeature feature, IGeometry other)
{
    try
    {
        ITopologicalOperator shape = feature.Shape as ITopologicalOperator;
        IPoint point = new PointClass();
        IGeometry geometry2 = shape.Intersect(other, esriGeometryDimension.esriGeometry0Dimension);
        if (!geometry2.IsEmpty)
        {
            IPointCollection points2 = geometry2 as IPointCollection;
            for(int i = 0; i < points2.PointCount; i++)
            {
                point = points2.get_Point(i);
                ISet set = (feature as IFeatureEdit).Split(point);
                set.Reset();
                for (IFeature feature2 = set.Next() as IFeature; feature2 != null; feature2 = set.Next() as IFeature)
                {
                    if (!IsSplitOk(feature2,other))
                    {
                        feature = feature2;
                    }
                    else
                    {
                        ISimpleLineSymbol symbol = new SimpleLineSymbolClass();
                        IRgbColor color = new RgbColorClass
                        {
                            RGB = Color.FromArgb(0xff, 0, 0).ToArgb()
                        };
                        symbol.Color = color;
                        symbol.Width = 2.0;
                        this.pMapControl.FlashShape(feature2.Shape, 1, 450, symbol as ISymbol);
                        pMapControl.ActiveView.FocusMap.SelectFeature(pCurrentLayer, feature2);
                    }

                }

            }
        }
    }
    catch (Exception)
    {
        return ;
    }

}

public bool IsSplitOk(IFeature feature, IGeometry splitLine)
{
    bool ok = false;
    try
    {
        ITopologicalOperator shape = feature.Shape as ITopologicalOperator;
        IGeometry geometry = shape.Intersect(splitLine, esriGeometryDimension.esriGeometry0Dimension);
        if (!geometry.IsEmpty)
        {
            IPointCollection points = geometry as IPointCollection;
            if(points.PointCount==1)
            {
                IPoint point = points.get_Point(0);
                if (IsLineStartEndPoint(feature,point))
                {
                    ok = true;
                }

            }
            else if (points.PointCount == 2)
            {
                IPoint point1 = points.get_Point(0);
                IPoint point2 = points.get_Point(1);
                if (IsLineStartEndPoint(feature, point1) && IsLineStartEndPoint(feature, point2))
                {
                    ok = true;
                }
            }

        }
        return ok;
    }
    catch (Exception)
    {
        return false;
    }
}


public bool IsLineStartEndPoint(IFeature feature,IPoint point)
{
    bool yes = false;
    try
    {
        IPolyline line = feature.Shape as IPolyline;
        double len = line.Length;
        IPoint pStart = line.FromPoint;
        if (Math.Abs(pStart.X - point.X) < 0.1 && Math.Abs(pStart.Y - point.Y) < 0.1)
        {
            yes = true;
        }
        else
        {
            IPoint pEnd = line.ToPoint;
            if (Math.Abs(pEnd.X - point.X) < 0.1 && Math.Abs(pEnd.Y - point.Y) < 0.1)
            {
                yes = true;
            }
        }
        return yes;
    }
    catch (Exception)
    {
        return false;
    }
}